the402 x402 endpoint directory

Activity-based carbon: convert a physical quantity (fuel, electricity, materials; 1,000+ activity types) into verified

13F holdings for any SEC-filing manager (hedge funds, asset managers) by CIK or manager ticker: latest 13F top 20 posi

OpenAI-compatible chat completions, nano tier: gpt-5.6-luna, gpt-5-nano, gemini flash-lite, small llama/ministral/qwen

Live fiat FX rates (Frankfurter/ECB primary, open.er-api fallback) for cross-border agents

Current temperature and wind for a city from Open-Meteo (live forecast data)

Get liquidation risk levels for DeFi lending protocols

AI chat completions - 80+ models (GPT-4o, Claude, Gemini, DeepSeek), pay per token with USDC

Verify and lint a third-party x402 endpoint without paying it. Probe the live HTTP 402 challenge, validate x402 v2 and

Decode a full 17-character VIN into normalized NHTSA vPIC make, model, year, body, engine, transmission, plant, fuel,

Get a global weather forecast for a city/locality name or exact coordinates. Returns normalized day/night or hourly pe

Query validated eth_getLogs events from one Base mainnet contract using a required event signature and optional indexe

Verify an npm/PyPI package before installing it: existence, known CVEs (OSV.dev), OpenSSF Scorecard, and typosquat/slo

Wrapped-BTC parity monitor on Base: WBTC/cbBTC on-chain pool price vs 1:1 parity, in bps, plus consecutive-minute stre

Run a low-cost token security audit and honeypot check using current automated GoPlus risk fields for a supported EVM

Use when an agent needs token metrics. Returns Token price and on-chain market metrics from free DefiLlama APIs, inclu

Official US weather forecast from the National Weather Service (NOAA): multi-day and hourly periods for any US coordin

Combined share of permanent water, herbaceous wetland and mangrove classes. The service evaluates a 60 metre local ana

Share of ESA WorldCover 2021 pixels classified as built-up. The service evaluates a 60 metre local analysis grid aroun

Share of ESA WorldCover 2021 pixels classified as tree cover. The service evaluates a 60 metre local analysis grid aro

Share of ESA WorldCover 2021 pixels classified as grassland. The service evaluates a 60 metre local analysis grid arou

Share of ESA WorldCover 2021 pixels classified as cropland. The service evaluates a 60 metre local analysis grid aroun

Dominant ESA WorldCover 2021 class in the analysis area. The service evaluates a 60 metre local analysis grid around o

Relative runoff tendency derived from slope and ruggedness. The service evaluates a 60 metre local analysis grid aroun

South-facing slope orientation index derived from aspect and slope. The service evaluates a 60 metre local analysis gr

Positive difference between the neighborhood mean and center elevation. The service evaluates a 60 metre local analysi

Difference between maximum and minimum sampled surface elevation. The service evaluates a 60 metre local analysis grid

Standard deviation of sampled surface elevations. The service evaluates a 60 metre local analysis grid around one coor

Circular direction of the dominant surface gradient, clockwise from north. The service evaluates a 60 metre local anal

Maximum adjacent-cell surface gradient across the analysis grid. The service evaluates a 60 metre local analysis grid

Mean first-order surface gradient across the analysis grid. The service evaluates a 60 metre local analysis grid aroun

Bilinear surface elevation from Copernicus DEM GLO-30. The service evaluates a 60 metre local analysis grid around one

Resolve one DOI into normalized open Crossref bibliographic, author, container, citation-count, license, identifier, a

Search 300,000+ US government datasets on catalog.data.gov (Catalog API): titles, publishing org, formats, and direct

Resolve a US latitude/longitude to its county, state and census block FIPS codes via the FCC Area API. Use it when an

Decode one 17-character VIN through the official NHTSA vPIC API into normalized vehicle identity and powertrain fields

Look up official Legal Entity Identifier records by LEI or legal name through the live GLEIF API.

Read the current ERC-20 allowance for an owner, spender, and token from a supported EVM network without signing or bro

Read contract event logs across a strictly bounded block range with an optional topic0 filter and capped response coun

Retrieve a real transaction receipt with execution status, gas consumption, contract creation address, bloom, and comp

Fetch a public HTTP(S) page with private-network blocking, remove boilerplate tags, and return bounded Markdown-like t

Current weather conditions for any location on Earth: temperature, feels-like, humidity, wind speed/direction/gusts, p

7-day daily weather forecast for any location: high/low temp, precipitation sum and probability, max wind, UV index, s

Resolve a free-form address or place name to coordinates: lat/lon, display name, bounding box, place type. OpenStreetM

Check any public URL: status code, latency, final URL after redirects, and response headers. The uptime primitive for

Bundled execution of the Number crunch workflow - Statistical analysis suite: descriptive statistics, correlation anal

Pre-flight an x402 payment: decode the endpoint's challenge, report the cost on every rail (Base and Solana) and the c

Decode a Base transaction's calldata into a human-readable function call and arguments — ERC-20 transfer/approve and t

Compare a page against its last stored state, or two supplied documents, and report only the content changes.

Cross-venue funding-rate arbitrage scan over all tracked crypto perpetuals: every ticker whose (max_rate − min_rate) a

OpenAI Responses API over x402 - point the OpenAI SDK's responses.create() (or the OpenAI Agents SDK) at base_url http