the402 x402 endpoint directory

Language detection API: identify the language of any text (60+ languages) with confidence scores and top-3 candidates

Parses any standard cron expression and computes its next 1-20 firing times in a chosen timezone, flagging malformed e

Validates a cron expression and lists its next several scheduled run times as ISO timestamps in any timezone, so you c

Cron expression parser API: validate any cron expression and get its next N run times as ISO timestamps in any timezon

Cron parser API: validate a cron expression and get its next 1-20 run times as ISO timestamps in any timezone. Instant

Converts cooking measurements between volume units (cups, tbsp, tsp, ml, l, fl-oz) and weight units (g, kg, oz, lb), u

Recipe measurement converter for cups, tablespoons, teaspoons, milliliters, liters, fluid ounces, grams, kilograms, ou

Cooking conversion API: cups↔grams↔tablespoons↔ml with ingredient-aware densities for 40+ ingredients (a cup of flour

Cooking measurement API: convert between cups, tbsp, tsp, ml, l, fl-oz, grams, kg, oz, lb — including volume↔weight us

Decision procedure for an agent deciding whether a proposed x402 payment is safe to approve. Covers three attack class

Exa Contents - Retrieve content from URLs

US Stock realtime price for AAPL

IANA timezone lookup for agents: offset, abbreviation, DST and local time for $0.002 USDC—stdlib zoneinfo, no API key.

Get the current floor price for an NFT collection across OpenSea + LooksRare (Ethereum). Returns per-marketplace floor

Look up the MEV-Boost payment for a specific slot or block number via the Flashbots relay. Returns the builder, propos

Search active Polymarket markets by keyword. Returns the top matches sorted by 24h volume, with question, current outc

Return the NFTs owned by a wallet address on a given network. Each row carries the collection name, contract address,

Price a European option (call or put) with the Black-Scholes-Merton model, plus the greeks (delta, gamma, vega, theta,

Inline every local `$ref` in an OpenAPI 3.x or Swagger 2.x document so downstream tools see a self-contained spec. Res

Compare two OpenAPI 3.x or Swagger 2.x documents and return a structured diff: added / removed / changed endpoints, wi

Parse an IPv4 CIDR block: network address, broadcast, first/last host, netmask, and host count. Optionally test if an

Convert CSV into a GitHub-flavored Markdown table (first row is the header).

Verify an HS256/384/512 JWT signature against a secret and check expiry. Returns valid + decoded payload. (HMAC algori

Validate an email address: syntax check plus live MX record lookup on the domain (deliverability signal, not a guarant

Deep-compare two JSON values. Returns a list of changed/added/removed paths (capped at 1000 differences).

Compute the current TOTP code (RFC 6238, 30s period, SHA-1, 6 digits) from a base32 secret. Useful for agents that mus

Fetch NFT collection (ERC-721 / ERC-1155) metadata by contract address on Ethereum, Base, Polygon, Arbitrum, or Optimi

Reverse-resolve a batch of Ethereum addresses to ENS primary names + avatar URLs (up to 50 per call). Returns one row

Builder market share aggregated over the last N MEV-Boost blocks via the Flashbots relay. Returns per-builder block co

Historical odds (implied probabilities) for a Polymarket outcome token. Returns timestamped price samples with first/l

Spot quote for swapping through a Uniswap V3 pool at the current tick. amountIn is in human units (not wei). zeroForOn

Return the most recent asset transfers (incoming + outgoing) for a wallet address — native coin, ERC-20, ERC-721, ERC-

Shrink an OpenAPI 3.x or Swagger 2.x document for LLM context by stripping verbose meta-fields (examples, descriptions

Is B20 live on Base mainnet? Queries the Activation Registry precompile for base.b20_asset and base.b20_stablecoin (or

Validate a JSON document against a JSON Schema (draft-07 subset) and get the list of violations. Supports type, requir

Flesch Reading Ease score and Flesch–Kincaid grade level for English text, plus word/sentence/syllable counts.

Generate a QR code PNG from any text or URL. ?text=…&size=256 (128-1024).

Parse a 5-field cron expression and return the next N run times (UTC).

Convert an HTML fragment or document you already have into clean markdown. (To fetch + convert a live URL, use /api/ex

Parse YAML into JSON (safe schema — no code execution).

Current gas snapshot across Ethereum + supported L2s (Base, Polygon, Arbitrum, Optimism), sorted cheapest-first. Retur

Last N MEV-Boost-built blocks via the Flashbots relay. For each block: slot, block number/hash, builder pubkey, propos

Live CLOB orderbook for a Polymarket outcome token. Returns top N bids (highest first), top N asks (lowest first), bes

Read on-chain state of a Uniswap V3 pool: token0/token1 addresses + decimals, fee tier, current sqrtPriceX96, tick, in

Look up the native coin balance (ETH/MATIC) plus every ERC-20 holding for a wallet address on Ethereum, Base, Polygon,

For one operation, return the minimum set of inputs an agent must provide to make a successful call. Locate the op by

Validate a JSON payload against the request or response schema for one operation in an OpenAPI 3.x or Swagger 2.x spec

Flatten an OpenAPI 3.x or Swagger 2.x spec into a structured list of callable endpoints — one row per operation with m

Current gas price (gwei and wei) on Base, Polygon, Arbitrum, Optimism, Ethereum, or Robinhood Chain — for an agent bud

Inspect a PDF without downloading the whole thing into your model: page count, title, author, subject, creator, produc