2s.io — pay-per-call APIs for agents

@2sio/mcp exposes 2s.io's 132 paid REST endpoints to any MCP host. Every call is paid per request from a USDC-funded wallet using the x402 protocol, settled on Base or Solana — no accounts, no API keys, no signup.

Why

• Live data. Patent grants from yesterday, court opinions and roll-call votes from last week, FDA recalls and USGS earthquakes from a minute ago — post-training-cutoff and continuously refreshed.
• Authoritative + citable. Every response carries the upstream source URL. USPTO, SEC EDGAR, Congress.gov, FEC, openFDA, NHTSA, DOL, NWS, NOAA, USGS, US Census, OFAC, CourtListener (Free Law Project), Federal Register, OurAirports, arXiv, PubMed, Semantic Scholar, Wikipedia, Wikidata.
• Structured. Typed JSON, deterministic shape, no LLM layer between you and the data (except where that's the point — see agent primitives).
• Cheap. $0.001 – $0.06 per call. Sub-cent for most lookups.

Install (Claude Desktop / Cursor / any MCP host)

{
  "mcpServers": {
    "twosio": {
      "command": "npx",
      "args": ["-y", "@2sio/mcp"],
      "env": {
        "EVM_PRIVATE_KEY": "0x..."
      }
    }
  }
}

EVM_PRIVATE_KEY is an EVM private key funded with USDC on Base mainnet. A few cents covers hundreds of calls.

What's in the catalog

• Agent primitives: persistent key-value memory (put/get/list/delete), agent-to-agent marketplace (register, discover, profile, review), knowledge-delta — "what changed in topic X since date Y" with LLM-backed source routing and synthesis
• Law: case-search, case-verify, opinion, attorney + judge lookup, federal-register, sanctions-check (OFAC SDN)
• Government: Congress bills, amendments, committees, hearings, members, nominations, treaties; House + Senate roll-call votes; bill summaries; FEC candidates, committees, contributions, expenditures; FDA drug/device/food/animal-vet events + recalls; OSHA inspections + accidents, MSHA; USAspending awards; EPA facilities; USGS water
• Finance: SEC EDGAR company facts, filings, insider trades (Form 4), 13F holdings; US Treasury debt + operating cash
• Vehicles (NHTSA): VIN decode, WMI decode, recalls, complaints, investigations, makes/models
• Patents (USPTO ODP): search, detail, documents
• Papers: unified arXiv + PubMed + Semantic Scholar; Wikipedia summary; Wikidata entities
• Geo / Earth: geocode forward + reverse, weather/zip, airport lookup + near, climate stations, quakes, tides, sunrise, earth events + now-composite, POI/near, timezone
• US data: Census ACS ZIP demographics, College Scorecard, hospital + medical-license + broker lookup, USAJOBS + BLS series, IRS nonprofit search, NYC property parcels, parks + recreation, fuel stations + solar resource
• Crypto: gas oracle, multi-chain address validate (BTC, ETH, SOL, LTC, TRX, XRP, BCH)
• URLs / DNS / internet: unfurl, clean-to-markdown, DNS lookup, RDAP whois, IP geolocation (single + 100-IP bulk), npm/PyPI registry lookups, Hacker News
• AI utilities: summarize, translate, extract (URL → typed JSON per schema), describe-image (vision + OCR), screenshot, image compress
• Misc: hash compute, barcode/QR generate, countdown GIF, phone normalize, chemistry compounds, space weather, dictionary + related words, World Bank indicators, FX rates, book search, food/nutrition

Full live catalog: https://2s.io/api/directory. OpenAPI spec: https://2s.io/api/openapi. LLM manifest: https://2s.io/llms.txt.

Source + SDKs

• MCP server: npmjs.com/package/@2sio/mcp
• TypeScript SDK: npmjs.com/package/@2sio/sdk
• Python SDK: pypi.org/project/2sio (+ LangChain and LlamaIndex adapters)
• Public mirror + examples: github.com/2s-io/sdk

License

MIT.