the402 x402 endpoint directory

Runs a sequence of named arithmetic steps in exact rational arithmetic, returning every intermediate value as a fracti

Natural hazard events NASA is currently tracking worldwide, filterable by category, bounding box and recency, with the

Searches federal rulemaking documents on Regulations.gov, returning title, agency, docket, type, posted date and comme

DNS email security audit — SPF, DMARC, DKIM, BIMI, and MTA-STS check for domain spoofing and deliverability risk. Agen

Latest daily stock quote for a US-listed ticker. Returns the most recent completed trading session: open, high, low, c

Fetch the authoritative text of any section of the US Code of Federal Regulations by title and section number — for ex

Convert an XML document to an ordered JSON tree with resolved namespaces, attributes, CDATA and mixed content preserve

Encode text, a URL or a payment string as a QR code, returned as SVG, a base64 PNG, or the raw module matrix.

Grade a domain's email-authentication and DNS-security posture from live DNS in one call: SPF, DMARC (policy + alignme

Search US patent applications and grants via the USPTO Open Data Portal. Query: q (required, 2+ chars), yearFrom / yea

Fetch the authoritative current text of any United States Code section by title and section number — for example title

Public X/Twitter search API for AI agents. Search recent public posts by keyword without requiring the caller to maint

What it would cost to execute a given notional in a given market right now: size-weighted fill price, slippage from th

Daily ECB reference rates between two currencies over a date range, one point per working day.

Resolve a free-text, brand or generic drug name to its canonical RxNorm concept: RxCUI, normalized name, term type, sy

FDA medical device recall and enforcement reports filtered by product, firm, recall class, state, status or report dat

Every active National Weather Service watch, warning and advisory for a whole US state, territory, marine area or fore

Foods in USDA FoodData Central matching a name, each with its FDC id, serving size and calories, protein, fat and carb

Federal disaster declarations for a state, with incident type, declaration date, designated county and which assistanc

Most recent SEC filings for a US registrant by ticker or CIK, with form type, dates, item numbers and document URLs.

URL Metadata Extract: URL title, description, Open Graph image and canonical metadata Executed deterministically by th

URL Metadata Extract: URL title, description, Open Graph image and canonical metadata Executed deterministically by th

The therapeutic, pharmacologic, mechanism-of-action, ATC and VA classes a drug or ingredient belongs to, from NLM RxCl

Vulnerabilities added to CISA’s Known Exploited Vulnerabilities catalog within a recent lookback window, newest first.

Search registered clinical trials by condition, intervention, sponsor or free text, filtered by recruitment status and

Name, biography, employments and educations for an ORCID iD, with an optional capped list of the most recent publicati

Infers a JSON Schema 2020-12 document from sample records: unified types, required keys, array item types and string f

Answers 402 via GET. Speaks the v2 dialect over the PAYMENT-REQUIRED header, charges $0.005 on base.

ERC20 Transfer logs via eth_getLogs - raw Transfer events for a token or wallet

Query Ethereum contract event logs via eth_getLogs - filter by contract, topic, and block range

Simulate a read-only Ethereum contract call via eth_call - no transaction sent

Read a raw storage slot from any Ethereum contract via eth_getStorageAt

Search X/Twitter for any query and get the actual matching tweets — keyword, $CASHTAG, from:handle (a user timeline),

Get real-time Best Bid/Ask for any FX pair, aggregated from multiple institutional liquidity providers. 62-88% tighter

Resolves an ENS name into its addresses, text records, and content hash, with batch support up to 50 names and per-nam

Get real-time Best Bid/Ask for ALL available FX pairs in a single call. Multi-source aggregated from multiple institut

Onchain loyalty platform on Base Network. Businesses launch branded rewards in minutes, customers earn real value with

Trust score (0-100, grade A-F) for any x402 endpoint -- listed in our catalog or not. Unlike uptime-only checkers, we

WHOIS domain lookup — raw registry text with registrar, nameservers, lifecycle dates and status, plus the responding s

Crypto token price in USD, EUR and more — real-time spot prices for one or many coins by CoinGecko id (bitcoin, ethere

Current x402 ecosystem composition: services per category (Agentic.Market taxonomy: Data, Inference, Search, Infra, Me

Twitter (X) video & image downloader — pass a public tweet / X post URL, get direct CDN media links: .mp4 video URLs w

The catalog of Hyperliquid prediction-market outcomes and their metadata.

X Tweet Search ($0.005/call): Search X (Twitter) posts with full advanced-search syntax (from:, since:, until:, exact

List all available FX symbols with their current quality state and source count. AI agent API for discovering availabl

Unforgeable operating history for any AI agent attesting through Rubric Protocol: record count, first-seen date, conti

ChainQuery Bitcoin Intelligence: independent Bitcoin-native on-chain data over x402, no API key. Live mempool fee-pres

Pay once to receive a short-lived WebSocket ticket for the live Bitcoin mempool stream.

A Small Blessing. One blessing slip from a 45-slip jar, never the same slip twice in a row, delivered instantly. Full

Top crypto coins ranked by market cap — paginated market data (price, market-cap rank, symbol) in any currency, CoinGe