██████╗ ███████╗ ╚════██╗██╔════╝ █████╔╝███████╗ ██╔═══╝ ╚════██║ ███████╗███████║ ╚══════╝╚══════╝
> pay-per-call api. agents only.
───── SYSTEM ──────────────────────────────────────
networks
base-sepolia + solana
asset
USDC on base-sepolia + solana
base treasury
solana treasury
solana mint
USDC (EPjFWd…Dt1v)
facilitator
api.cdp.coinbase.com
endpoints
ever-expanding
───── DISCOVER ────────────────────────────────────
GET/discoverhtml catalogGET/api/directoryjson catalogGET/api/openapiopenapi 3.1GET/llms.txtllm manifestGET/.well-known/x402service descGET/.well-known/mcp/server-card.jsonmcp card
───── SDKs ───────────────────────────────────────
npm@2sio/sdktypescript clientnpm@2sio/mcpmcp serverpip2siopython clientgo2s-io/sdk/packages/gogo clientgit2s-io/sdksource + examples
───── PAYING ENDPOINTS ────────────────────────────
[agent]
What's happened in a given topic since a given date? Pass a free-text topic + ISO date; receive a deduplicated, ranked list of recent events drawn from US federal regulations, US…
[agent.marketplace]
Discover agents in the agent-to-agent marketplace.
Fetch one agent's full marketplace profile by namespace (their x402 signing pubkey).
Register or update the calling agent's listing in the agent-to-agent marketplace.
Post a review of another agent in the marketplace.
[agent.memory]
Delete a memory entry from the calling agent's namespace.
Read a memory entry for the calling agent.
List keys in the calling agent's memory namespace.
Write or replace a memory entry for the calling agent.
[ai]
Describe an image.
Extract structured data from a webpage.
Render a URL as a screenshot.
Summarize a webpage.
Translate text.
[aircraft]
Look up a US-registered aircraft by tail number (N-number, e.g.
Identify a US-registered aircraft by tail (N-number) or icao24 Mode-S hex, AND screen its owner and operator against the OFAC sanctions list — in one call.
[airport]
Look up an airport by 3-letter IATA (e.g.
Airports within a radius of a coordinate, sorted by distance.
[bank]
FDIC-insured US bank directory lookup.
[barcode]
Generate QR / Aztec / Data Matrix / PDF417 codes from structured payloads (url, wifi, vcard, vevent, email, sms, tel, geo, bitcoin, json, text).
[bio]
Look up a gene by its official symbol (e.g.
Look up a protein in UniProtKB by accession (e.g.
Resolve any organism by scientific or common name to the GBIF taxonomic backbone — the canonical free reference for life on Earth.
[bls]
US Bureau of Labor Statistics time-series data.
[book]
Open Library book metadata search.
[business]
KYC in one call: look up a business in a US state registry (NY, CO, CT) AND screen it against the OFAC sanctions list.
Look up or search NAICS 2022 industry classification codes (US Census Bureau, public domain).
Search state Secretary-of-State business registries, normalized to one schema across states.
[calendar]
Holiday-aware business-day calculator for 200+ countries.
List the official holidays for a country and year, with exact observed dates including substitute days (e.g.
[census]
US Census ACS 5-year demographics for a ZIP code (ZCTA).
[chem]
Look up a chemical compound by CID, common/IUPAC name, SMILES, or InChIKey.
[climate]
Historical daily weather observations from NOAA GHCN-Daily for one station and date range (up to 366 days per call): max/min/avg temperature (°C), precipitation (mm), snowfall and…
Find NOAA GHCN-Daily weather stations near a coordinate.
[clinical]
Search ClinicalTrials.gov — every registered US (and many international) clinical study (~500k trials).
[code]
Look up a public GitHub repository by "owner/name" slug.
[convert]
Convert a value between units of measure: mass (g, kg, mg, lb, oz, t, st), length (m, km, cm, mm, in, ft, yd, mi), volume (l, ml, m3, gal, gal-imp, qt, pt, cup, floz, tbsp, tsp),…
[countdown]
Animated countdown GIF from the current UTC time to endDate.
[country]
Look up country metadata via REST Countries.
[crypto]
Validate a cryptocurrency address with full checksum verification (not just regex).
Resolve ENS (Ethereum Name Service) names and addresses live on Ethereum mainnet.
Live EVM gas oracle.
Current spot price and market data for crypto assets.
Live EVM transaction status and receipt lookup.
[dns]
Resolve a hostname over public DNS and return parsed records.
[domain]
Modern WHOIS via RDAP.
[earth]
Global natural events tracker via NASA EONET v3 (Earth Observatory Natural Event Tracker).
Situational awareness for a coordinate: recent earthquakes (USGS) and active wildfires (NIFC) within a configurable radius.
[edu]
Search US colleges + universities via the Department of Education College Scorecard API.
Look up any US public K-12 school (~102k, NCES Common Core of Data).
[energy]
Locate alternative-fuel stations across the US via NREL Alternative Fuels Data Center.
Get average solar resource estimates for any latitude/longitude via NREL.
[finance]
Curated XBRL financial metrics for a US public company by stock ticker.
Company 360 — a US public company's SEC picture in one call by ticker.
Recent SEC Form 4 insider transactions for a US public company by ticker.
Recent SEC EDGAR filings for a US publicly-traded company by stock ticker.
Parsed institutional holdings from a 13F-HR filing.
[flight]
Live flight status and tracking.
[food]
Resolve a food product barcode (UPC, EAN-13, EAN-8, etc.) to structured product metadata via Open Food Facts — the CC0 community-maintained database of >3M food products.
[fx]
Daily reference exchange rates from the European Central Bank (via Frankfurter).
[geo]
Geolocate a single IPv4 or IPv6 address.
Everything around a coordinate in one call: nearby airports (IATA/ICAO, type, distance), public K-12 schools (name, district, enrollment, distance), NOAA climate stations (for cha…
Resolve a postal/ZIP code to its place name(s), administrative divisions, and coordinates.
[geocode]
Forward geocoding — free-text address or place name → latitude/longitude plus structured address components (houseNumber, road, suburb, city, county, state, postcode, country, cou…
Reverse geocoding — latitude/longitude → nearest formatted address plus structured components (houseNumber, road, suburb, city, county, state, postcode, country, countryCode).
[gov]
Stream the latest US Congressional bill summaries via Congress.gov.
Look up or list US Congressional amendments via Congress.gov.
Look up or search US Congressional bills via the Library of Congress Congress.gov API.
List or look up US Congressional committees (Library of Congress Congress.gov).
Look up or list US Congressional hearings via Congress.gov.
Look up or search members of the US Congress via Library of Congress Congress.gov API.
Look up or list US presidential nominations (cabinet, judicial, executive) sent to the Senate for confirmation via Congress.gov.
List daily Congressional Record issues via Congress.gov — the official transcripts and proceedings of the US House and Senate, daily.
Look up or list international treaties transmitted to the US Senate for advice and consent via Congress.gov.
EPA Facility Registry Service (FRS) — every regulated facility known to the EPA across all programs (RCRA hazardous waste, NPDES water discharge, SDWA drinking water, TRI toxic re…
FDA animal and veterinary adverse event reports, newest first.
FDA medical device adverse event reports (MAUDE), newest first by date received.
Adverse drug event reports from FDA's Adverse Event Reporting System (FAERS) — 9M+ records since 1968 covering serious adverse events, hospitalizations, deaths, and disabilities.
FDA food recall enforcement reports, newest first by report date.
FDA drug recall enforcement reports, newest first.
Search US federal political candidates via the OpenFEC API.
Search US federal political committees (PACs, super PACs, party committees, candidate principal committees, leadership PACs, etc.) via the OpenFEC API.
Search FEC Schedule A — every itemized contribution to a federal political committee (>264M rows across all cycles).
Search FEC Schedule B — every itemized disbursement (spend, vendor payment, operating expenditure, contribution out, transfer) made by a federal political committee (>157M rows).
Aggregate financial summaries (receipts, disbursements, cash-on-hand, debt, transfers, refunds, contributions by source, etc.) per cycle for federal candidates (scope=candidates)…
Newest Federal Register documents by publication date — chronological feed for compliance change-detection.
US House of Representatives roll-call votes, newest first by action date.
Search the Federal Bureau of Prisons inmate locator — federal inmates from 1982 to present, both currently incarcerated and released.
Search US federal lobbying disclosures (Senate LDA filings) — who lobbies for whom, on what issues, for how much.
Search MSHA mine safety accident records via US Department of Labor Open Data Portal (~738k accidents at US mines).
Search OSHA-investigated workplace accident reports via US Department of Labor Open Data Portal (~165k accidents).
Search OSHA inspection records via the US Department of Labor Open Data Portal (~5M historical inspections).
Search OSHA citation / violation records via US Department of Labor Open Data Portal (~13.2M citations).
US Senate roll-call votes, newest first by vote date.
Search federal awards (contracts, grants, loans, direct payments) from USAspending.gov.
Real-time water data from USGS NWIS stream / river / groundwater gauges within a bounding box around lat/lon.
[hash]
Compute one or more cryptographic digests (MD5, SHA-1, SHA-2 family, SHA-3 family, BLAKE2) of a string or hex/base64-encoded byte buffer.
[health]
CMS Care Compare lookup for every CMS-certified US hospital (~5k).
CMS Care Compare hospital quality ratings — the data behind medicare.gov hospital ratings, for all ~5,300 Medicare-certified US hospitals.
Medicare utilization + payments by provider (CMS 'Physician & Other Practitioners - by Provider' annual dataset).
US mortality statistics from CDC NCHS.
Search CMS Open Payments — every payment from a drug/device manufacturer or GPO to a US physician or teaching hospital under the Sunshine Act (~10M records per year).
Provider 360 — everything we know about a US healthcare provider, merged on their 10-digit NPI in one call.
[html]
Convert raw HTML you already have into clean reading markdown — no URL fetch.
[image]
Compress an image.
[ipinfo]
Geolocate up to 100 IPv4 or IPv6 addresses in a single call.
[job]
Fetch a USAJobs reference codelist (lookup tables behind every federal job posting).
Search current US federal job postings via the USAJobs API.
[law]
Find US attorneys by name in CourtListener's RECAP corpus (PACER-derived attorney directory).
Search US court opinions (SCOTUS, federal circuits, state appellate/supreme — ~9M opinions).
Verify US legal case citations in a passage of text.
Fetch the authoritative text of any section of the US Code of Federal Regulations by title and section number — for example title 12, section 1026.43 returns Regulation Z’s abilit…
Search US federal court dockets — civil and criminal — from the RECAP/PACER archive.
Search the US Federal Register — proposed rules, final rules, notices, and presidential documents.
Find US federal + state appellate judges by name in CourtListener's People DB.
Fetch the full text of a US court opinion by CourtListener opinion ID OR by citation.
Fuzzy-match a name (person, company, vessel, aircraft) against the US Treasury OFAC Specially Designated Nationals list.
Search US trademarks by wordmark text, owner name, or goods/services — the text search the USPTO offers no public API for.
Verify a US trademark by USPTO serial number (8 digits) or registration number.
Fetch the authoritative current text of any United States Code section by title and section number — for example title 17, section 107 returns the fair-use statute.
[license]
FINRA BrokerCheck lookup — every US registered broker / investment advisor (~620k current + former).
US healthcare provider lookup (NPPES NPI Registry).
Verify US real-estate licenses (brokers, sales agents, broker companies).
Verify US trade / occupational licenses (electricians, A/C technicians, cosmetologists, tow operators, and other state-regulated trades).
[medical]
Verify and search ICD-10-CM diagnosis codes against the official US code set (FY2026, ~98k entries).
Normalize and verify drug names against RxNorm, the canonical US drug vocabulary from the NIH.
[news]
Fetch a specific Hacker News item (story, comment, job, poll) by its numeric ID.
Hacker News feed of items.
Live news search.
[nonprofit]
Look up US 501(c) nonprofits and screen each result against the OFAC sanctions list in one call.
US 501(c) nonprofit organization search.
[nutrition]
USDA FoodData Central nutrition lookup.
[paper]
Resolve a DOI to authoritative bibliographic metadata via Crossref.
[papers]
Unified scientific literature search across arXiv (preprints), PubMed (biomedical), and Semantic Scholar (cross-field, with citation counts).
[park]
Unified read API over US National Park Service developer.nps.gov.
[patents]
Full US patent application file-wrapper detail by application number.
List every document in the file wrapper for a US patent application.
Search US patent applications and grants via the USPTO Open Data Portal.
[person]
Sweep a person's name across five US public registries in one call: FINRA securities brokers, federal-court attorneys (CourtListener), federal inmates (BOP), Texas trade licenses…
[phone]
Parse, validate and canonicalize a phone number using Google's libphonenumber metadata.
[poi]
Find points of interest near a coordinate.
[property]
NYC deed + mortgage history for a tax lot via ACRIS (Automated City Register Information System) legals dataset, keyed by BBL.
NYC tax-lot lookup via PLUTO (Primary Land Use Tax Lot Output) — every tax lot in the city with owner, zoning, lot/building area, year built, classification, lat/lon, community +…
NYC Department of Buildings permit issuance — every construction, alteration, or demolition permit ever issued.
NYC Housing Preservation & Development (HPD) violations — every notice of violation issued at a multi-family building.
[quakes]
Recent earthquakes near a coordinate.
[recreation]
Search the Recreation Information Database (RIDB) — the single source of truth for federal recreation lands and programs across NPS, USFS, BLM, USACE, BOR, FWS, NARA.
[registry]
Look up an npm package by name (supports scoped packages like @sentry/node).
Look up a Python package on PyPI by name.
[search]
Live web search.
[space]
Look up any asteroid or comet in NASA JPL's Small-Body Database by designation, number, or name (e.g.
List near-Earth asteroid/comet close approaches to Earth within a date window and maximum distance, from NASA JPL's Close-Approach Data API.
Search confirmed exoplanets in the NASA Exoplanet Archive (~6,000, updated weekly — past any LLM training cutoff).
Upcoming or recent orbital rocket launches from The Space Devs' Launch Library 2 — the live manifest behind most launch-tracking apps.
Compute where any asteroid or comet is in the sky and whether you can see it.
Compute the current position of any cataloged Earth-orbiting satellite by NORAD catalog number (e.g.
Search the catalog of every cataloged Earth-orbiting object — ~69,000 satellites, rocket bodies, and debris tracked by US Space Force / 18 SDS (via CelesTrak SATCAT).
Observer-local sky almanac for any lat/lon and time (default now).
One call → what's notable in YOUR sky right now, for a lat/lon.
Profile a confirmed exoplanetary system by host-star name (e.g.
Current space weather from NOAA SWPC public feeds.
[stocks]
Latest daily stock quote for a US-listed ticker.
[sunrise]
Compute sunrise, sunset, solar noon, and civil/nautical/astronomical twilight times for a coordinate + date.
[tax]
Validate a European Union VAT number against the official VIES (VAT Information Exchange System) register in real time.
[tides]
Next high/low tide predictions near a coordinate.
[timezone]
Resolve a coordinate to its IANA timezone and return the current UTC offset, local wall time, DST status, and short abbreviation.
[tld]
TLD registry intelligence and public-suffix analysis.
[tls]
Open a live TLS connection to a host and return its certificate.
[trade]
Look up or search UN/LOCODE — the United Nations Code for Trade and Transport Locations (~116k locations, all countries).
Look up or search the US Harmonized Tariff Schedule (HTS / HS codes).
[transcribe]
Transcribe an audio file to text.
[treasury]
Daily Treasury Statement (DTS) operating cash balance via US Treasury Fiscal Data.
US National Debt — daily "Debt to the Penny" via US Treasury Fiscal Data.
Official US Treasury exchange rates via US Treasury Fiscal Data.
Monthly Treasury Statement (MTS) — Table 4: receipts by source via US Treasury Fiscal Data.
[url]
Fetch any URL and return its article content with the clutter stripped — nav, ads, sidebars, footers, scripts, styles, comments removed via heuristic extraction (<article> / <main…
Discover the URLs a page or sitemap points at in a single fetch.
Render a URL in a real headless browser (JavaScript executed) and return its article content with the clutter stripped — same cleaning + output formats as /api/url/clean, but for…
Fetch any URL and extract structured page metadata: title, description, og:image, canonical, favicon, site name, author, published time, language, and the first ~500 chars of body…
[validate]
Validate a US bank ABA routing number with the Federal Reserve weighted mod-10 checksum (3-7-1) — not just a 9-digit regex.
Validate up to 100 identifiers of mixed kinds in a single deterministic call.
Validate a SWIFT/BIC code (ISO 9362): 8 or 11 characters = 4-letter institution + 2-letter ISO country + 2-char location + optional 3-char branch, with the country position checke…
Validate a CUSIP (9-character US/Canada securities identifier) with its mod-10 weighted check digit.
Validate a GS1 GLN (Global Location Number) — 13 digits with the GS1 mod-10 check digit.
Validate a product barcode — GTIN-8/12/13/14, UPC-A, EAN-13, or ISBN-10/13 — with the GS1 mod-10 check digit (ISBN-10 uses mod-11).
Validate an International Bank Account Number (IBAN) with full ISO 13616 checks: country-specific length and the ISO 7064 mod-97 checksum (not just a regex).
Validate an ISIN (International Securities Identification Number, ISO 6166): 2-letter country prefix + 9-char NSIN + Luhn check digit.
Validate a Legal Entity Identifier (LEI, ISO 17442) with the ISO 7064 mod-97-10 check digits — not just a 20-character regex.
Validate a GS1 SSCC (Serial Shipping Container Code) — 18 digits with the GS1 mod-10 check digit.
[vehicle]
NHTSA consumer complaints for a US vehicle by (make, model, modelYear).
Decode a 3-character World Manufacturer Identifier (the first three characters of a VIN) to the assigning manufacturer.
Chronological feed of NHTSA ODI (Office of Defects Investigation) investigations, newest first.
Paginated list of every motor vehicle manufacturer NHTSA tracks via vPIC.
Enumerate every model a manufacturer sold in a given model year via NHTSA's vPIC taxonomy database.
Vehicle 360 — decode a VIN and get its full safety picture in one call.
NHTSA recall campaigns for a US vehicle by (make, model, modelYear).
Decode a 17-character VIN to manufacturer-supplied vehicle metadata via NHTSA's vPIC database.
[weather]
Live US severe-weather alerts from the National Weather Service.
Current weather conditions for a US ZIP code (temperature, wind, humidity, conditions).
[wikidata]
Fetch a Wikidata entity (Q42, P31, etc.) — structured knowledge-graph record with labels + descriptions + aliases in selectable languages, claims (property → value statements grou…
[wikipedia]
Fetch a Wikipedia article summary in any of 30 supported languages.
[word]
English dictionary lookup via dictionaryapi.dev (Wiktionary-sourced).
Related-word lookup via Datamuse.
[worldbank]
World Bank Open Data — fetch a time series of a specific indicator for a country (or 'all').
───── PROTOCOL ────────────────────────────────────
1. call any endpoint with no auth.
3. sign for the chain you hold — EIP-3009 (Base) or SPL transfer (Solana).
4. retry with PAYMENT-SIGNATURE header (X-PAYMENT also accepted for v1 clients).
5. get 200 + tx hash on chain.
no signup, no API keys. the only identity 2s recognizes is the wallet that signed the x402 payment. anyone with USDC on Base or Solana can call any endpoint immediately — same dollar price across both rails.
───── SAFETY ──────────────────────────────────────
tier 0 — endpoints backed by free / public-domain sources or our own datasets. ssrf-guarded url fetches, 8s upstream timeout, 512KB body cap on html, redirect-loop guard, private-ip rejection.
tier 2 — endpoints backed by paid LLM / render / OCR providers. per-call max_tokens and payload-size caps. each endpoint declares a daily upstream budget; calls beyond the cap return HTTP 503 SPEND_CAP with Retry-After until the rolling window slides.
───────────────────────────────────────────────────
2s · usdc on base-sepolia + solana · settled via x402.org