the402 x402 endpoint directory

Share your namespace with another wallet so different agents can coordinate through it. Grant read or readwrite access

Deterministically mask emails, phone numbers, credit-card-like numbers, IPv4 addresses, and US SSNs in text. Returns r

Get the lead summary, thumbnail, and URL for any Wikipedia article title.

Search Hacker News stories and comments by query, sorted by relevance or date (Algolia HN).

Validate a Cloudflare Turnstile, Google reCAPTCHA, or hCaptcha token server-side. You pass your OWN provider secret pl

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

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

Resolve a 4-byte function selector or a 32-byte event topic hash to its known human-readable Solidity signatures, via

Escape hatch for power users: forward an arbitrary read-only JSON-RPC method to the chain. Method must be in our read-

Solve a bond's yield to maturity from its market price - the annual rate that present-values the coupons plus face to

Resolve authentication requirements across an OpenAPI 3.x or Swagger 2.x document. Returns the catalog of security sch

Search operations in an OpenAPI 3.x or Swagger 2.x spec against a free-text query. Tokenizes the query (lowercase, alp

Score an OpenAPI 3.x or Swagger 2.x spec on agent-readiness - i.e. does an LLM-driven caller have what it needs to cal

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

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

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

Parse CSV (quoted fields supported) into a JSON array of objects, using the first row as headers (header=false for arr

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

Get full detail for a single Polymarket market by slug or id. Returns question, description, outcome prices (implied p

Follow a short link's redirect chain (bit.ly, t.co, youtu.be, tracking links, …) without downloading any page body: re

Is this address a contract, and what code does it hold? Returns isContract, deployed bytecode size, and the keccak-256

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

Country facts by name or ISO code: official name, capital, region, currencies, languages, timezones, dialing code, TLD

Resolve a lat/lon to a structured postal address: road, house number, city, state, postcode, country (with ISO code).

Safely evaluate an arithmetic expression (+ - * / % ^ and parentheses). No code execution - a real parser, not eval.

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).

Line-by-line diff of two texts (LCS). Returns unified-style ops and change counts. Up to 2000 lines per side.

Parse XML into a JSON object tree (attributes under _attrs, text under _text; repeated elements become arrays).

Convert a JSON array of objects to CSV. Nested objects are flattened to dot-path columns.

All token balances for any address in one call, from Coinbase's indexed data API - ERC-20 + native on EVM, SPL on Sola

Historical daily weather for any location and date range (up to 1 year): high/low temp, precipitation, wind, condition

Reverse-lookup an Ethereum address to its Farcaster account (via verified address). Returns FID, username, display nam

Top L2s by Total Value Locked (TVL) via DeFiLlama. Returns each L2 with TVL in USD, native token symbol, and CoinGecko

Get full detail for a single Kalshi event with all its nested markets. Mutually-exclusive flag tells you whether the m

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

Check whether an email address has a Gravatar: hashes the normalized email (MD5, pure CPU - the raw address is never s

Who owns this NFT? Calls ownerOf(tokenId) on any ERC-721 contract on Ethereum, Base, Polygon, Arbitrum, or Optimism. C

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

Compute future value of a principal under compound interest. Returns future value, total interest earned, and the effe

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