# AgentTools

> Free tools for humans, machine-native APIs for AI agents.

AgentTools hosts utility tools — calculators, converters, reference databases. Every tool is a free web page AND a paid JSON API for AI agents using the x402 protocol (HTTP 402 + USDC on Base). No accounts, no API keys: unpaid requests receive 402 with payment instructions; attach an X-PAYMENT header (via any x402 client library) and the same request returns 200 with JSON.

## Payment (x402)

- Protocol: x402 v2, scheme "exact", asset USDC
- Network: eip155:8453 (Base mainnet)
- Facilitator: https://x402.org/facilitator
- PayTo (receiving address): 0x8a0F2b0a6C82D1c54B16E2e4DEcd18fF0802b0f6
- Prices: $0.001–$0.025 per call (per-endpoint price listed with each tool)
- Tip jar (any amount 0.01–10 USD): GET https://agentstoolshub.com/api/tip?amount=1.00&note=thanks

## Machine docs

- OpenAPI 3.1 spec: https://agentstoolshub.com/api/openapi.json
- Full tool reference: https://agentstoolshub.com/llms-full.txt
- Integration guide: https://agentstoolshub.com/for-agents
- MCP server (Streamable HTTP): https://agentstoolshub.com/api/mcp — 35 tools as MCP tools with x402 payment in _meta; use @x402/mcp x402MCPClient for automatic payment

## Calculators

- [Percentage Calculator](https://agentstoolshub.com/calculators/percentage-calculator): Calculate X% of Y, what percent X is of Y, and the percent change between two values — with step-by-step working shown. Use this when an agent needs to percent of a number, ratios and percent change.
  - API: GET https://agentstoolshub.com/api/v1/calculators/percentage-calculator?x=15&y=200&op=percent_of — $0.002/call
- [Discount Calculator](https://agentstoolshub.com/calculators/discount-calculator): Calculate the final sale price and the amount saved for any price and percent-off discount, with the working shown. Use this when an agent needs to sale price and savings from a percent off.
  - API: GET https://agentstoolshub.com/api/v1/calculators/discount-calculator?price=79.99&discount=20 — $0.002/call
- [Tip Calculator](https://agentstoolshub.com/calculators/tip-calculator): Calculate the tip for any bill, the grand total, and how much each person pays when splitting. Defaults to a 15% tip. Use this when an agent needs to tip amount, total and per-person split.
  - API: GET https://agentstoolshub.com/api/v1/calculators/tip-calculator?bill=64.5&tipPercent=15&people=1 — $0.002/call
- [VAT Calculator](https://agentstoolshub.com/calculators/vat-calculator): Add VAT to a net amount or remove VAT from a gross amount. Standard VAT rates for 36 countries are built in, or override with any custom rate. Use this when an agent needs to add or remove VAT at standard rates for 36 countries.
  - API: GET https://agentstoolshub.com/api/v1/calculators/vat-calculator?amount=100&country=DE&op=add — $0.003/call
- [BMI Calculator](https://agentstoolshub.com/calculators/bmi-calculator): Calculate Body Mass Index from weight (kg) and height (cm), with the WHO weight category and the healthy BMI weight range for your height. Use this when an agent needs to body Mass Index with WHO category.
  - API: GET https://agentstoolshub.com/api/v1/calculators/bmi-calculator?weight=70&height=175 — $0.002/call
- [Date Difference Calculator](https://agentstoolshub.com/calculators/date-difference-calculator): Count the total days between two dates, plus the breakdown in weeks and days and in calendar years, months and days. Use this when an agent needs to days, weeks and calendar time between two dates.
  - API: GET https://agentstoolshub.com/api/v1/calculators/date-difference-calculator?start=2024-01-01&end=2024-12-31 — $0.002/call
- [Age Calculator](https://agentstoolshub.com/calculators/age-calculator): Calculate a person's exact age in calendar years, months and days from their date of birth, plus total days lived. Reference date defaults to today (UTC). Use this when an agent needs to exact age in years, months and days.
  - API: GET https://agentstoolshub.com/api/v1/calculators/age-calculator?birth=1990-06-15&on=2026-09-01 — $0.002/call
- [Loan Payment Calculator](https://agentstoolshub.com/calculators/loan-payment-calculator): Calculate the fixed monthly payment for a loan from its principal, annual interest rate and term in years, plus total repaid and total interest (annuity formula). Use this when an agent needs to monthly payment, total cost and interest for any loan.
  - API: GET https://agentstoolshub.com/api/v1/calculators/loan-payment-calculator?principal=300000&annualRate=4.5&years=30 — $0.003/call
- [Compound Interest Calculator](https://agentstoolshub.com/calculators/compound-interest-calculator): Project the future value of a deposit with compound interest: choose annual, semi-annual, quarterly, monthly, weekly or daily compounding and see total interest earned. Use this when an agent needs to future value with any compounding frequency.
  - API: GET https://agentstoolshub.com/api/v1/calculators/compound-interest-calculator?principal=10000&annualRate=5&years=10&timesPerYear=12 — $0.003/call
- [Fuel Cost Calculator](https://agentstoolshub.com/calculators/fuel-cost-calculator): Calculate the liters of fuel a trip needs and its total cost from distance, consumption (L/100 km) and price per liter — with optional cost splitting between passengers. Use this when an agent needs to trip fuel and cost, splitable between people.
  - API: GET https://agentstoolshub.com/api/v1/calculators/fuel-cost-calculator?distance=450&consumption=6.5&pricePerLiter=1.75&people=1 — $0.002/call
- [Reading Time Calculator](https://agentstoolshub.com/calculators/reading-time-calculator): Estimate reading time from a word count at any reading speed. Defaults to 200 words per minute — the typical silent-reading speed for adults. Use this when an agent needs to how long a text takes to read, by word count.
  - API: GET https://agentstoolshub.com/api/v1/calculators/reading-time-calculator?words=1500&wpm=200 — $0.002/call
## Converters

- [Length Converter](https://agentstoolshub.com/converters/length-converter): Convert between metric and imperial length units: kilometers, meters, centimeters, millimeters, micrometers, nanometers, miles, yards, feet, inches and nautical miles. Use this when an agent needs to metric and imperial distance units, instantly.
  - API: GET https://agentstoolshub.com/api/v1/converters/length-converter?value=1&from=km&to=m — $0.002/call
- [Weight Converter](https://agentstoolshub.com/converters/weight-converter): Convert between weight and mass units: metric tons, kilograms, grams, milligrams, pounds, ounces and stones with exact international definitions. Use this when an agent needs to kilograms, pounds, ounces and more.
  - API: GET https://agentstoolshub.com/api/v1/converters/weight-converter?value=1&from=t&to=kg — $0.002/call
- [Temperature Converter](https://agentstoolshub.com/converters/temperature-converter): Convert between Celsius, Fahrenheit and Kelvin with exact formulas, reference points (freezing and boiling water) and step-by-step working. Use this when an agent needs to celsius, Fahrenheit and Kelvin, both ways.
  - API: GET https://agentstoolshub.com/api/v1/converters/temperature-converter?value=20&from=c&to=f — $0.002/call
- [Data Size Converter](https://agentstoolshub.com/converters/data-size-converter): Convert digital storage units: bits, bytes, KB, MB, GB, TB (decimal, ×1000) and KiB, MiB, GiB, TiB (binary, ×1024) — both systems side by side. Use this when an agent needs to decimal (KB/MB/GB) and binary (KiB/MiB/GiB) units.
  - API: GET https://agentstoolshub.com/api/v1/converters/data-size-converter?value=1&from=TB&to=GB — $0.002/call
- [Speed Converter](https://agentstoolshub.com/converters/speed-converter): Convert speed units: kilometers per hour, miles per hour, meters per second, knots and feet per second with exact definitions. Use this when an agent needs to km/h, mph, m/s, knots and ft/s.
  - API: GET https://agentstoolshub.com/api/v1/converters/speed-converter?value=1&from=kmh&to=mph — $0.002/call
- [Area Converter](https://agentstoolshub.com/converters/area-converter): Convert area units: square millimeters, centimeters, meters and kilometers, hectares, acres, square feet and square miles. Use this when an agent needs to square meters, feet, acres, hectares.
  - API: GET https://agentstoolshub.com/api/v1/converters/area-converter?value=1&from=km2&to=ha — $0.002/call
- [Volume Converter](https://agentstoolshub.com/converters/volume-converter): Convert cooking and liquid volume units: milliliters, liters, cubic meters, US gallons, quarts, pints, cups, fluid ounces, tablespoons and teaspoons. Use this when an agent needs to liters, gallons, cups, milliliters.
  - API: GET https://agentstoolshub.com/api/v1/converters/volume-converter?value=1&from=m3&to=L — $0.002/call
- [Unix Timestamp Converter](https://agentstoolshub.com/converters/unix-timestamp-converter): Convert Unix epoch timestamps to ISO/UTC dates and back. Millisecond timestamps are detected automatically; invalid dates are rejected with clear errors. Use this when an agent needs to epoch seconds ↔ human dates, both directions.
  - API: GET https://agentstoolshub.com/api/v1/converters/unix-timestamp-converter?op=to_date&value=1735689600 — $0.002/call
- [Roman Numeral Converter](https://agentstoolshub.com/converters/roman-numeral-converter): Convert numbers to Roman numerals (1–3999) and Roman numerals back to numbers, with strict validation that rejects non-standard forms like IIIM or VX. Use this when an agent needs to numbers ↔ Roman numerals, with validation.
  - API: GET https://agentstoolshub.com/api/v1/converters/roman-numeral-converter?value=2026&op=to_roman — $0.002/call
## Databases

- [Countries Database](https://agentstoolshub.com/databases/countries): Reference database of all 250 countries and territories: ISO 3166-1 codes, capitals, regions, population, area, currencies, languages, TLDs and calling codes. Look up a single country or list by region. Use this when an agent needs to 250 countries: codes, capitals, currencies, populations.
  - API: GET https://agentstoolshub.com/api/v1/databases/countries?country=Germany — $0.003/call
- [US Area Codes](https://agentstoolshub.com/databases/area-codes): Look up any US telephone area code to find the state or territory it serves, or list every area code in a given state. Covers all 404 NANP codes in use, including overlays. Use this when an agent needs to all 404 NANP area codes → state lookup.
  - API: GET https://agentstoolshub.com/api/v1/databases/area-codes?code=415 — $0.002/call
## Live Data

- [Current Time](https://agentstoolshub.com/live/now): Returns the current date and time in any IANA time zone, plus Unix seconds/milliseconds, ISO 8601, weekday and day-of-year. Use it whenever an agent needs to know 'now'. Use this when an agent needs to the current date/time in any time zone — agents have no clock.
  - API: GET https://agentstoolshub.com/api/v1/live/now?tz=UTC — $0.001/call
- [Business Days Calculator](https://agentstoolshub.com/live/business-days): Count business days (Mon–Fri) between two dates, with weekend and holiday breakdown. Provide a country code and real public holidays (via Nager.Date) are excluded too. Use this when an agent needs to working days between dates, optionally minus public holidays.
  - API: GET https://agentstoolshub.com/api/v1/live/business-days?start=2026-09-01&end=2026-09-30 — $0.003/call
- [Exchange Rates (Live)](https://agentstoolshub.com/live/exchange-rates): Live foreign-exchange reference rates from the European Central Bank (via frankfurter.dev): a full rate table against any base currency, or cross-rate conversion of any amount. Refreshed every business day by the ECB, cached one hour. Use this when an agent needs to live ECB reference rates for 30 currencies.
  - API: GET https://agentstoolshub.com/api/v1/live/exchange-rates?op=rates&base=USD — $0.005/call
- [Weather (Live)](https://agentstoolshub.com/live/weather): Live weather from Open-Meteo: current temperature, humidity, wind and conditions plus a 3-day forecast, by city name or coordinates. No API key, cached 30 minutes. Use this when an agent needs to current conditions + 3-day forecast for any city.
  - API: GET https://agentstoolshub.com/api/v1/live/weather?city=Berlin — $0.005/call
- [Public Holidays (Live)](https://agentstoolshub.com/live/holidays): List upcoming or full-year public holidays for any covered country via Nager.Date — names, dates and whether they're nationwide. Essential for scheduling agents. Use this when an agent needs to upcoming public holidays for ~110 countries.
  - API: GET https://agentstoolshub.com/api/v1/live/holidays?country=DE&op=next&count=8 — $0.005/call
- [IP Geolocation (Live)](https://agentstoolshub.com/live/ip-lookup): Geolocate any IPv4/IPv6 address (or the caller's own IP when omitted) via ipwho.is: country, region, city, coordinates, timezone, ASN/network owner and currency. Cached 24 hours per IP. Use this when an agent needs to where is an IP address? Country, city, ASN, timezone.
  - API: GET https://agentstoolshub.com/api/v1/live/ip-lookup?ip=8.8.8.8 — $0.005/call
- [DNS Lookup (Live)](https://agentstoolshub.com/live/dns-lookup): Query live DNS records (A, AAAA, MX, TXT, NS, CNAME, SOA) through Cloudflare's DNS-over-HTTPS resolver. Domain validation, email deliverability pre-checks and infrastructure discovery. Use this when an agent needs to real DNS records via Cloudflare DNS-over-HTTPS.
  - API: GET https://agentstoolshub.com/api/v1/live/dns-lookup?domain=example.com&type=A — $0.005/call
- [URL Metadata (Live)](https://agentstoolshub.com/live/url-metadata): Fetch a URL server-side and extract its title, meta description, Open Graph and Twitter card tags, canonical URL and favicon — the data agents need to preview or classify a link. SSRF-guarded: private networks are blocked, 10s timeout, 1MB cap. Use this when an agent needs to title, description, OG image and favicon of any page.
  - API: GET https://agentstoolshub.com/api/v1/live/url-metadata?url=https%3A%2F%2Fexample.com — $0.005/call
- [QR Code Generator](https://agentstoolshub.com/live/qr-code): Generate a QR code for any text, URL or crypto address: returns ready-to-embed SVG markup and a data URI, with configurable size and error-correction level. Use this when an agent needs to any text or URL as a QR code (SVG + PNG data URI).
  - API: GET https://agentstoolshub.com/api/v1/live/qr-code?text=https%3A%2F%2Fexample.com&size=300&ec=M — $0.003/call
## Dev Tools

- [Base64 Encoder / Decoder](https://agentstoolshub.com/dev/base64-encode): Encode text to base64 or decode base64 back to text. Full UTF-8 support including emoji and non-Latin scripts. Use this when an agent needs to uTF-8 safe base64 in both directions.
  - API: GET https://agentstoolshub.com/api/v1/dev/base64-encode?text=Hello%2C%20world!&direction=encode — $0.002/call
- [Number Base Converter](https://agentstoolshub.com/dev/number-base-converter): Convert integers between any bases from 2 to 36 — binary, octal, decimal, hexadecimal and beyond — with BigInt precision (no limit on magnitude). Use this when an agent needs to binary, octal, decimal, hex — any base 2–36.
  - API: GET https://agentstoolshub.com/api/v1/dev/number-base-converter?value=ff&from=16&to=10 — $0.002/call
- [Case Converter](https://agentstoolshub.com/dev/case-converter): Convert text between nine letter cases: UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE. camelCase boundaries are split automatically. Use this when an agent needs to camelCase, snake_case, kebab-case and more.
  - API: GET https://agentstoolshub.com/api/v1/dev/case-converter?text=hello%20world&style=camel — $0.002/call
- [JWT Decoder](https://agentstoolshub.com/dev/jwt-decoder): Decode a JSON Web Token's header and payload to readable JSON. Pure decoding: signatures are NOT verified and no secret is needed. Accepts standard and URL-safe base64 with or without padding; claims like exp and iat are rendered as dates. Use this when an agent needs to decode header and payload — no verification.
  - API: GET https://agentstoolshub.com/api/v1/dev/jwt-decoder?token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkphbmUgRG9lIiwiaWF0IjoxNzAwMDAwMDAwfQ.dummy_signature_part — $0.003/call
- [URL Encoder / Decoder](https://agentstoolshub.com/dev/url-encoder): Percent-encode text for safe inclusion in URLs and query strings, or decode percent-encoded text back. Uses the standard encodeURIComponent rules. Use this when an agent needs to percent-encoding for query strings and URLs.
  - API: GET https://agentstoolshub.com/api/v1/dev/url-encoder?text=hello%20world%20%26%20more&op=encode — $0.002/call
- [JSON Formatter / Validator](https://agentstoolshub.com/dev/json-formatter): Validate JSON with precise error messages, pretty-print it with any indent, and inspect its top-level type and element counts. Use this when an agent needs to validate, pretty-print and inspect JSON.
  - API: GET https://agentstoolshub.com/api/v1/dev/json-formatter?json=%7B%22name%22%3A%22Ada%22%2C%22langs%22%3A%5B%22ts%22%2C%22py%22%5D%2C%22active%22%3Atrue%7D&indent=2 — $0.002/call
- [HTTP Status Codes Database](https://agentstoolshub.com/dev/http-status-codes): Reference database of HTTP response status codes with phrase, category and explanation. Look up a specific code or list a whole category (1xx–5xx). Use this when an agent needs to look up any HTTP status code's meaning.
  - API: GET https://agentstoolshub.com/api/v1/dev/http-status-codes?code=402 — $0.002/call
- [MIME Types Database](https://agentstoolshub.com/dev/mime-types): Look up MIME content types by type substring or file extension, or list a category — covering text, application, image, audio, video, font and multipart types used in web APIs. Use this when an agent needs to content-Type lookup by type or file extension.
  - API: GET https://agentstoolshub.com/api/v1/dev/mime-types?query=.png — $0.002/call
- [Token Estimator](https://agentstoolshub.com/dev/token-estimator): Estimate how many tokens a text consumes for each major model family (GPT, Claude, Gemini, Llama, DeepSeek) using a character/word heuristic that is within ~10% of real BPE tokenizers — enough for context budgeting and cost math, with zero dependencies. Use this when an agent needs to approximate token counts per LLM family, ±10%.
  - API: GET https://agentstoolshub.com/api/v1/dev/token-estimator?text=The%20quick%20brown%20fox%20jumps%20over%20the%20lazy%20dog.%20Pack%20my%20box%20with%20five%20dozen%20liquor%20jugs. — $0.002/call
- [LLM API Cost Calculator](https://agentstoolshub.com/dev/llm-cost-calculator): Calculate the API cost of an LLM call: input and output tokens × published per-million prices for 15 current models (OpenAI, Anthropic, Google, DeepSeek, xAI, Meta). Batch multiplier included for monthly estimates. Use this when an agent needs to tokens × current per-model prices = USD.
  - API: GET https://agentstoolshub.com/api/v1/dev/llm-cost-calculator?inputTokens=12000&outputTokens=1500&model=gpt-4o&calls=1 — $0.002/call
- [Text Chunker](https://agentstoolshub.com/dev/text-chunker): Split text into retrieval-friendly chunks with a token budget and sentence-aware boundaries. Overlap between consecutive chunks preserves context across splits — the standard preparation step before embedding. Use this when an agent needs to rAG-ready chunks with token budgets and overlap.
  - API: GET https://agentstoolshub.com/api/v1/dev/text-chunker?text=Retrieval-augmented%20generation%20improves%20factuality.%20First%2C%20documents%20are%20split%20into%20chunks.%20Second%2C%20chunks%20are%20embedded%20into%20vectors.%20Third%2C%20the%20agent%20retrieves%20the%20top%20matches%20for%20a%20query.%20Overlap%20keeps%20ideas%20that%20straddle%20boundaries%20intact.%20Finally%2C%20the%20model%20answers%20with%20citations.&targetTokens=60&overlapTokens=15 — $0.005/call
- [Hash Calculator](https://agentstoolshub.com/dev/hash): Compute exact hash digests of UTF-8 text using Web Crypto (SHA family) and a verified pure-JS MD5 for legacy checksums. Deterministic — identical input always yields the identical digest. Use this when an agent needs to sHA-256 / SHA-512 / SHA-1 / MD5, exact digests.
  - API: GET https://agentstoolshub.com/api/v1/dev/hash?text=hello&algo=sha256 — $0.002/call
- [UUID Generator / Validator](https://agentstoolshub.com/dev/uuid): Generate cryptographically random UUIDv4s or time-sortable UUIDv7s from a real CSPRNG, and validate any UUID's format, version and variant bits. Use this when an agent needs to random v4, sortable v7, plus strict validation.
  - API: GET https://agentstoolshub.com/api/v1/dev/uuid?op=generate&version=v4 — $0.002/call
- [Text Extractor](https://agentstoolshub.com/dev/text-extract): Scan unstructured text and extract structured entities: email addresses, URLs, IPv4 addresses, phone numbers and domains. Deduplicated, categorized, machine-ready. Use this when an agent needs to pull emails, URLs, IPs, phones and domains from raw text.
  - API: GET https://agentstoolshub.com/api/v1/dev/text-extract?text=Reach%20Jane%20at%20jane.doe%40acme-corp.io%2C%20sales%40acme-corp.io%20or%20%2B49%2030%201234567.%20Site%3A%20https%3A%2F%2Facme-corp.io%2Fpricing%20and%20CDN%20151.101.1.140.%20Backup%20mail%20host%3A%20mail.acme-corp.io — $0.005/call
- [Text Diff](https://agentstoolshub.com/dev/diff): Compare two texts line by line using an LCS diff: exact additions, removals and context — in unified-diff style. Deterministic, unlike asking a model to 'find the differences'. Use this when an agent needs to exact line-level diff with unified-style output.
  - API: GET https://agentstoolshub.com/api/v1/dev/diff?a=price%3A%20100%0Aquantity%3A%202%0Atotal%3A%20200&b=price%3A%20100%0Aquantity%3A%203%0Atotal%3A%20300&context=1 — $0.005/call
- [URL Parser](https://agentstoolshub.com/dev/url-parser): Parse a URL into all its components: protocol, hostname, port, path segments, query parameters (as a clean object), hash and credentials. Exact — no guessing by eye. Use this when an agent needs to break any URL into protocol, host, path and params.
  - API: GET https://agentstoolshub.com/api/v1/dev/url-parser?url=https%3A%2F%2Fuser%3Apw%40api.example.com%3A8443%2Fv1%2Fusers%3Fpage%3D2%26sort%3Dname%26tag%3Da%26tag%3Db%23results — $0.002/call
- [PDF to Text](https://agentstoolshub.com/dev/pdf-to-text): Fetch a PDF (by URL, SSRF-guarded) or accept it as base64 and extract all readable text with page count. Deterministic parsing — no language model, so nothing is invented. Text-based PDFs only; scanned images need OCR (not included). Use this when an agent needs to extract readable text from any PDF — agents can't read PDFs.
  - API: GET https://agentstoolshub.com/api/v1/dev/pdf-to-text?url=https%3A%2F%2Fwww.w3.org%2FWAI%2FER%2Ftests%2Fxhtml%2Ftestfiles%2Fresources%2Fpdf%2Fdummy.pdf — $0.010/call
- [URL Reader (Markdown)](https://agentstoolshub.com/dev/url-reader): Fetch a web page server-side and convert it to clean markdown — headings, links, lists, tables and text, with scripts, styles and boilerplate stripped. The 'reader' pattern agents use to actually understand web pages. SSRF-guarded with redirects re-validated, 10s timeout, 1MB cap. Use this when an agent needs to fetch any page and get clean markdown an LLM can read.
  - API: GET https://agentstoolshub.com/api/v1/dev/url-reader?url=https%3A%2F%2Fexample.com&maxChars=5000 — $0.010/call
- [Find an API (Directory Search)](https://agentstoolshub.com/dev/directory-search): Describe what you need and get back matching x402-paid APIs: our own catalog (54 tools) plus, optionally, the live x402 Bazaar of third-party sellers. The agent's meta-tool — instead of knowing an API exists, ask for the capability. Use this when an agent needs to "I need a tool that does X" → matched paid APIs.
  - API: GET https://agentstoolshub.com/api/v1/dev/directory-search?query=convert%20pdf%20to%20text&includeBazaar=true&limit=5 — $0.003/call
- [Natural Date Parser](https://agentstoolshub.com/dev/natural-date): Parse natural-language date and time expressions — "in two weeks", "next friday at 3pm", "dec 25th" — into exact ISO 8601 dates. Deterministic parsing (no LLM guessing); relative expressions resolve against a reference moment you control. Use this when an agent needs to "next friday 3pm" → exact ISO dates.
  - API: GET https://agentstoolshub.com/api/v1/dev/natural-date?text=next%20friday%20at%203pm&ref=2026-10-01T09%3A00%3A00Z — $0.002/call
- [Cron Explainer](https://agentstoolshub.com/dev/cron-describe): Turn a cron expression into plain English, validate it, and compute the exact next execution times. Deterministic — the answer to 'when does this cron actually fire?' without guessing. Use this when an agent needs to explain a cron expression and compute the next runs.
  - API: GET https://agentstoolshub.com/api/v1/dev/cron-describe?expr=0%209%20*%20*%201-5&ref=2026-10-01T09%3A00%3A00Z — $0.002/call
- [RSS / Atom Feed Parser](https://agentstoolshub.com/dev/feed-parser): Fetch an RSS or Atom feed and return normalized JSON items: title, link, publication date (ISO) and summary. Server-side fetching with SSRF guard; handles both RSS 2.0 and Atom dialects. Use this when an agent needs to any feed → clean JSON items, no XML parsing on your side.
  - API: GET https://agentstoolshub.com/api/v1/dev/feed-parser?url=https%3A%2F%2Fhnrss.org%2Ffrontpage&limit=10 — $0.005/call
- [Archive Lookup (Wayback)](https://agentstoolshub.com/dev/archive-lookup): Query the Internet Archive's Wayback index for any URL: when it was first archived, the most recent snapshot, how many years it spans, and recent capture dates. Useful for fact-checking page history, finding deleted content and due-diligence. Use this when an agent needs to how the Internet Archive remembers a URL.
  - API: GET https://agentstoolshub.com/api/v1/dev/archive-lookup?url=example.com — $0.005/call
- [ICS Calendar Parser](https://agentstoolshub.com/dev/ics-parser): Parse iCalendar (.ics) content — meeting invites, conference calendars, exports from Google/Outlook — into structured event JSON: title, start/end, location, organizer and description. Use this when an agent needs to turn .ics calendar files into clean event JSON.
  - API: GET https://agentstoolshub.com/api/v1/dev/ics-parser?ics=BEGIN%3AVCALENDAR%0AVERSION%3A2.0%0ABEGIN%3AVEVENT%0ASUMMARY%3AQuarterly%20Review%0ADTSTART%3A20261103T140000Z%0ADTEND%3A20261103T150000Z%0ALOCATION%3ARoom%204%20%2F%20Zoom%0AORGANIZER%3BCN%3DPM%20Office%3Amailto%3Apm%40example.com%0AEND%3AVEVENT%0AEND%3AVCALENDAR — $0.003/call
- [Email Validator](https://agentstoolshub.com/dev/email-validator): Validate an email address in two layers: strict RFC-style syntax, then a live DNS MX lookup on the domain to confirm the recipient actually runs mail servers. Catches the typos and fake domains that pure regex misses. Use this when an agent needs to syntax + live MX check — can this address receive mail?.
  - API: GET https://agentstoolshub.com/api/v1/dev/email-validator?email=someone%40gmail.com — $0.002/call
- [Domain Availability Check](https://agentstoolshub.com/dev/domain-availability): Check whether a domain name is registered or available, via the official RDAP registry protocol (404 = available). For registered domains it also returns the registrar and creation/expiration dates — useful when an agent needs to name a product or verify how long a business has existed. Use this when an agent needs to is this domain taken? Registry answer, not a landing page.
  - API: GET https://agentstoolshub.com/api/v1/dev/domain-availability?domain=example.com — $0.003/call
- [Page Claim Verifier](https://agentstoolshub.com/dev/page-verify): Verify a claim about a web page's content: fetches the page (SSRF-guarded) and reports whether the expected text appears, with the surrounding excerpt as evidence. The deterministic way for an agent to confirm 'the site says X' before acting on it. Use this when an agent needs to does this page actually say that? Checked, not guessed.
  - API: GET https://agentstoolshub.com/api/v1/dev/page-verify?url=https%3A%2F%2Fexample.com&expect=documentation — $0.005/call
- [API Health Check](https://agentstoolshub.com/dev/api-health-check): Probe a GET endpoint several times and report status codes and latency statistics (min/avg/max). The cheap way for an agent to verify an API — for example one found on the x402 Bazaar — responds before spending real money calling it. Use this when an agent needs to status and latency stats — test an API before relying on it.
  - API: GET https://agentstoolshub.com/api/v1/dev/api-health-check?url=https%3A%2F%2Fapi.frankfurter.dev%2Fv1%2Flatest%3Fbase%3DUSD&runs=3 — $0.005/call
- [User-Agent Parser](https://agentstoolshub.com/dev/useragent-parse): Parse a User-Agent header into structured data: browser (name/version), rendering engine, operating system, and device type/vendor/model. Deterministic — the same string always parses identically. Use this when an agent needs to uA string → browser, engine, OS and device.
  - API: GET https://agentstoolshub.com/api/v1/dev/useragent-parse?userAgent=Mozilla%2F5.0%20(Windows%20NT%2010.0%3B%20Win64%3B%20x64)%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F126.0.0.0%20Safari%2F537.36 — $0.002/call
- [Table Extractor](https://agentstoolshub.com/dev/table-extract): Extract every HTML table from a page (or raw HTML) as structured JSON: headers and rows kept intact. The deterministic answer to 'get the pricing table / comparison table / stats table from this page' — no vision model needed. Use this when an agent needs to hTML tables → structured JSON rows and columns.
  - API: GET https://agentstoolshub.com/api/v1/dev/table-extract?html=%3Chtml%3E%3Cbody%3E%3Ctable%3E%3Ctr%3E%3Cth%3EPlan%3C%2Fth%3E%3Cth%3EPrice%3C%2Fth%3E%3C%2Ftr%3E%3Ctr%3E%3Ctd%3EFree%3C%2Ftd%3E%3Ctd%3E%240%3C%2Ftd%3E%3C%2Ftr%3E%3Ctr%3E%3Ctd%3EPro%3C%2Ftd%3E%3Ctd%3E%2429%3C%2Ftd%3E%3C%2Ftr%3E%3C%2Ftable%3E%3C%2Fbody%3E%3C%2Fhtml%3E — $0.010/call
## Crypto & Web3

- [Wei / Gwei / ETH Converter](https://agentstoolshub.com/crypto/wei-eth-converter): Convert between wei, kwei, mwei, gwei, microether, milliether and ether with exact BigInt arithmetic. Decimal strings of any magnitude convert without floating-point error. Use this when an agent needs to exact Ethereum unit conversion — no float errors.
  - API: GET https://agentstoolshub.com/api/v1/crypto/wei-eth-converter?value=21000&from=gwei&to=eth — $0.002/call
- [Gas Fee Calculator](https://agentstoolshub.com/crypto/gas-fee-calculator): Calculate a transaction's gas fee: gas units × gas price (gwei) gives the ETH cost, multiplied by the ETH price for USD. Exact BigInt math for the wei amounts. Use this when an agent needs to transaction cost in ETH and USD from gas × gwei.
  - API: GET https://agentstoolshub.com/api/v1/crypto/gas-fee-calculator?gasUnits=21000&gweiPrice=10&ethPriceUsd=3000 — $0.003/call
- [Crypto Price (Live)](https://agentstoolshub.com/crypto/price): Live cryptocurrency prices from CoinGecko's public API: current price in USD/EUR/GBP/JPY plus 24-hour change for any coin by id or common ticker (btc, eth, sol…). Cached 60 seconds. Use this when an agent needs to live token prices and 24h change via CoinGecko.
  - API: GET https://agentstoolshub.com/api/v1/crypto/price?ids=bitcoin%2Cethereum&vs=usd — $0.005/call
- [Secure Random Generator](https://agentstoolshub.com/crypto/random-generator): Generate cryptographically secure randomness: passwords with charset rules, hex keys of any byte length, and uniform random integers (rejection sampling, no modulo bias). Never use Math.random for secrets. Use this when an agent needs to cSPRNG passwords, hex keys and uniform integers.
  - API: GET https://agentstoolshub.com/api/v1/crypto/random-generator?mode=password&length=24 — $0.002/call
- [Wallet Snapshot (Live)](https://agentstoolshub.com/crypto/wallet-snapshot): One-call on-chain profile of any Ethereum or Base wallet via Blockscout: native balance, transaction and transfer counts, activity recency, top token holdings, and most frequent recent counterparties — with fresh-wallet and high-volume flags. The 'who is this address?' conclusion, not raw RPC data. Use this when an agent needs to on-chain wallet profile: balance, activity, tokens, counterparties.
  - API: GET https://agentstoolshub.com/api/v1/crypto/wallet-snapshot?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&chain=ethereum — $0.010/call
- [New Pool Scanner](https://agentstoolshub.com/crypto/new-pools): Scan newly created DEX pools on Solana, Base, Ethereum, BSC, Arbitrum or Polygon, filtered by minimum liquidity and maximum age. Each pool comes with liquidity (USD), 24h volume, FDV, buy/sell counts and automatic risk flags (too fresh, thin liquidity, sell pressure). Powered by GeckoTerminal's public API. Use this when an agent needs to fresh DEX launches with liquidity, volume and risk flags.
  - API: GET https://agentstoolshub.com/api/v1/crypto/new-pools?network=solana&minLiquidityUsd=5000&maxAgeHours=24&limit=10 — $0.005/call
- [Transaction Explainer](https://agentstoolshub.com/crypto/tx-explain): Explain what an EVM transaction would actually do: decodes the calldata (ERC-20 transfers/approvals via known ABIs, unknown selectors via the 4byte directory) and simulates the call against live chain state to report the outcome — including unlimited-approval warnings — without sending anything. Use this when an agent needs to decode and simulate a transaction — before signing it.
  - API: GET https://agentstoolshub.com/api/v1/crypto/tx-explain?chain=base&to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&data=0xa9059cbb000000000000000000000000d8dA6BF26964aF9D7eEd9e03E53415D37aA960450000000000000000000000000000000000000000000000000000000000002710 — $0.015/call
## NFT Intelligence

- [NFT Collection Due Diligence](https://agentstoolshub.com/nft/collection-due-diligence): Full on-chain due-diligence report for any NFT collection: mint supply, unique holders, top-10 ownership concentration with a verdict, wash-trading indicators from transfer patterns, and recent activity trend. Read straight from the chain — the check an agent runs before its human buys. Use this when an agent needs to the Carfax for NFT collections — holders, concentration, wash signals.
  - API: GET https://agentstoolshub.com/api/v1/nft/collection-due-diligence?contract=0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D&chain=ethereum — $0.025/call
- [NFT Holder Distribution](https://agentstoolshub.com/nft/holder-distribution): Top holders of any NFT collection with exact quantities, individual and cumulative ownership percentages, and concentration statistics — the distribution picture agents need before valuing or recommending a collection. Use this when an agent needs to who owns the collection, and how concentrated is it.
  - API: GET https://agentstoolshub.com/api/v1/nft/holder-distribution?contract=0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D&chain=ethereum&limit=20 — $0.010/call
- [NFT Collection Activity](https://agentstoolshub.com/nft/collection-activity): Live transfer feed of an NFT collection with per-address accumulation analysis: net quantities received vs sent over recent activity, ranking the buyers adding to positions and the wallets exiting. The actionable view behind the raw transfer list. Use this when an agent needs to who is accumulating and who is exiting — right now.
  - API: GET https://agentstoolshub.com/api/v1/nft/collection-activity?contract=0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D&chain=ethereum&limit=20 — $0.005/call
- [Wallet NFT Portfolio](https://agentstoolshub.com/nft/wallet-nfts): Look up an address's NFT portfolio across collections: each collection held, quantity owned, sorted by size. The enrichment endpoint for agents profiling wallets — pairs with wallet-snapshot for the full picture. Use this when an agent needs to every NFT collection a wallet holds, in one call.
  - API: GET https://agentstoolshub.com/api/v1/nft/wallet-nfts?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&chain=ethereum&limit=20 — $0.005/call
- [NFT Collection Comparison](https://agentstoolshub.com/nft/collection-compare): Compare any two NFT collections on the full due-diligence metric set: supply, holders, holder ratio, top-10 concentration, wash-trading score and activity trend — with a winner per metric. The head-to-head an agent runs before recommending one collection over another. Use this when an agent needs to two collections side-by-side, metric by metric verdicts.
  - API: GET https://agentstoolshub.com/api/v1/nft/collection-compare?contractA=0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D&contractB=0x60E4d786628Fea6478F785A6d7e704777c86a7c6&chain=ethereum — $0.025/call
## Finance & Business

- [ROI Calculator](https://agentstoolshub.com/finance/roi-calculator): Calculate return on investment: profit (or loss) and the percentage return relative to the initial amount invested. Use this when an agent needs to return on investment as a percentage.
  - API: GET https://agentstoolshub.com/api/v1/finance/roi-calculator?initial=10000&final=12500 — $0.002/call
- [CAGR Calculator](https://agentstoolshub.com/finance/cagr-calculator): Calculate the compound annual growth rate that takes an initial value to a final value over a given number of years — the standard way to annualize returns. Use this when an agent needs to compound annual growth rate, time-normalized.
  - API: GET https://agentstoolshub.com/api/v1/finance/cagr-calculator?initial=10000&final=16000&years=3 — $0.002/call
- [Margin & Markup Calculator](https://agentstoolshub.com/finance/margin-calculator): Calculate gross profit, profit margin (profit as % of price) and markup (profit as % of cost) from a unit cost and selling price — the two numbers people constantly mix up. Use this when an agent needs to profit margin vs markup, both computed.
  - API: GET https://agentstoolshub.com/api/v1/finance/margin-calculator?cost=60&price=100 — $0.002/call
- [IBAN Validator](https://agentstoolshub.com/finance/iban-validator): Validate an International Bank Account Number: country code, country-specific length and the ISO 7064 MOD 97-10 check digits — with the pretty-printed grouping returned when valid. Use this when an agent needs to structure, length and mod-97 checksum validation.
  - API: GET https://agentstoolshub.com/api/v1/finance/iban-validator?iban=DE89%203704%200044%200532%200130%2000 — $0.003/call