# 2s

**Canonical:** https://apis.io/providers/2s-io/  
**Website:** https://2s.io/  
**APIs profiled:** 2

2s ("the (most) everything API", 2s.io) is a pay-per-call REST API built for AI agents: 575 endpoints across 112 groups on one origin — US public records and government data, company and legal identifiers (GLEIF, OFAC, state registries), SEC filings, crypto and web3, security and CVEs, patents and case law, medical codes, weather and geocoding, ANSI X12 / EDIFACT EDI, an OpenAI-compatible AI gateway (chat, image, multi-model council) and wallet-scoped agent infrastructure (kv/doc/vector/blob store, locks, queues, schedules, pub/sub and 26 kinds of signed-callback watchers). There are no accounts and no API keys: every call is paid in USDC on Base or Solana through the x402 protocol (HTTP 402 → sign → retry), with a free trial call per endpoint per hour and actual-usage "upto" billing on AI endpoints. The same catalog is published as an OpenAPI 3.1.0 contract at https://2s.io/openapi.json, a remote MCP server at https://2s.io/mcp (plus the npx @2sio/mcp local server), an A2A 0.3.0 agent card whose one skill is endpoint discovery, an RFC 9727 API catalog, an APIs.json index, an llms.txt, an MCP server card, an x402 manifest and an ERC-8004 on-chain agent registration. Maintained by an individual operator (alley@2s.io); the SDK monorepo is github.com/2s-io/sdk.

## Kin Score — 54.6 / 100 (strong)

Scored 2026-10-09 under rubric 0.23.0. Trend: flat (+0.0 from 54.6).

| Facet | Score |
|---|---|
| Discoverability | 75.0 |
| Contract Quality | 58.8 |
| Contract Governance | 18.2 |
| Operational Transparency | 76.3 |
| Developer Ergonomics | 66.7 |
| Access Clarity | 10.5 |

Regulatory layer — **Government & Public Sector**: 16.7 (matched via tags).

## Agent readiness — 47.3 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | verified |
| MCP Server | documented |
| Auth Clarity | bearer |
| Idempotency | documented |
| Error Semantics | derived |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | derived |
| Agent Skills | yes |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | conformant |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## APIs (114)

- **2s MCP Server** — Remote Model Context Protocol server at https://2s.io/mcp (Streamable HTTP, POST only, protocol version 2025-06-18, serverInfo 2s.io 1.0.0). initialize and tools/list answer ano...
- **2s A2A Agent** — Agent2Agent (A2A) protocol surface: an agent card served from https://2s.io/.well-known/agent-card.json (protocolVersion 0.3.0, JSONRPC transport, version 1.0.0, provider 2s) ad...
- **2s Agent API** — The agent API from 2s — 1 operation(s) for agent.
- **2s Agriculture API** — The agriculture API from 2s — 2 operation(s) for agriculture.
- **2s AI API** — The ai API from 2s — 16 operation(s) for ai.
- **2s Airport API** — The airport API from 2s — 2 operation(s) for airport.
- **2s Aviation API** — The aviation API from 2s — 4 operation(s) for aviation.
- **2s Bank API** — The bank API from 2s — 1 operation(s) for bank.
- **2s Barcode API** — The barcode API from 2s — 1 operation(s) for barcode.
- **2s Batch API** — The batch API from 2s — 1 operation(s) for batch.
- **2s Bio API** — The bio API from 2s — 3 operation(s) for bio.
- **2s Bls API** — The bls API from 2s — 1 operation(s) for bls.
- **2s Book API** — The book API from 2s — 1 operation(s) for book.
- **2s Business API** — The business API from 2s — 16 operation(s) for business.
- **2s Calendar API** — The calendar API from 2s — 4 operation(s) for calendar.
- **2s Census API** — The census API from 2s — 2 operation(s) for census.
- **2s Chem API** — The chem API from 2s — 1 operation(s) for chem.
- **2s Chinese API** — The chinese API from 2s — 3 operation(s) for chinese.
- **2s Class API** — The class API from 2s — 1 operation(s) for class.
- **2s Climate API** — The climate API from 2s — 2 operation(s) for climate.
- **2s Clinical API** — The clinical API from 2s — 2 operation(s) for clinical.
- **2s Code API** — The code API from 2s — 1 operation(s) for code.
- **2s Convert API** — The convert API from 2s — 2 operation(s) for convert.
- **2s Countdown API** — The countdown API from 2s — 1 operation(s) for countdown.
- **2s Country API** — The country API from 2s — 2 operation(s) for country.
- **2s Crypto API** — The crypto API from 2s — 46 operation(s) for crypto.
- **2s Dev API** — The dev API from 2s — 15 operation(s) for dev.
- **2s Dns API** — The dns API from 2s — 1 operation(s) for dns.
- **2s Domain API** — The domain API from 2s — 4 operation(s) for domain.
- **2s Earth API** — The earth API from 2s — 2 operation(s) for earth.
- **2s Econ API** — The econ API from 2s — 10 operation(s) for econ.
- **2s Edi API** — The edi API from 2s — 5 operation(s) for edi.
- **2s Edu API** — The edu API from 2s — 2 operation(s) for edu.
- **2s Email API** — The email API from 2s — 1 operation(s) for email.
- **2s Energy API** — The energy API from 2s — 8 operation(s) for energy.
- **2s Factcheck API** — The factcheck API from 2s — 1 operation(s) for factcheck.
- **2s Feedback API** — The feedback API from 2s — 1 operation(s) for feedback.
- **2s Finance API** — The finance API from 2s — 17 operation(s) for finance.
- **2s Flight API** — The flight API from 2s — 3 operation(s) for flight.
- **2s Food API** — The food API from 2s — 2 operation(s) for food.
- …and 74 more, listed in full on the page.

## MCP servers (1)

- **2s MCP Server** — 2s ships the same MCP server two ways. HOSTED: https://2s.io/mcp — the apex host that also serves the website, the OpenAPI and the A2A endpoint — is POST-only Streamable HTTP (a...

## Agentic access (1)

- **2S Io Agentic Access** — 575 operations · 102 acting · 2 human-in-the-loop

## Security (2)

- **2S Io Authentication** — apiKey · 3 schemes
- **2S Io Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **2S Io Plans Pricing**

## Tags

Agents, Agentic Commerce, x402, MCP, A2A, Public Records, Government Data, Finance, Crypto, Security, Legal, Weather, Geocoding, EDI, AI Gateway, Agent Infrastructure, Webhook, Agent-Native

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/2s-io/). Scores are computed from the provider's own public artifacts under a published rubric.