The data layer of the agent internet.
OPP defines how data providers make their data agent-consumable, verifiable, and discoverable. Three components: provider manifest, response envelope, query interface.
Agents get data naked. No provenance. No freshness guarantee. No confidence score. No way to verify the source. The agent internet is missing its data envelope.
Related MCP server: mcp-sam-gov
Component | What it does |
Manifest ( | Declares what data a provider serves, how fresh it is, how to verify it |
Response Envelope | Every response carries domain, source, freshness, confidence, citation, Ed25519 signature |
Query Interface | Standardized HTTP GET endpoints with predictable parameters |
Level 1 (Basic): Manifest + envelope with domain/source/freshness
Level 2 (Cited): Level 1 + confidence scores + citations
Level 3 (Verified): Level 2 + Ed25519 cryptographic proof
Live at api.openprimitive.com. 16 US federal data domains across 11 agencies. Level 3 compliant — every response is signed.
curl https://api.openprimitive.com/v1/drugs?name=aspirin
# Returns OPP envelope with proof.type: "DataIntegrityProof"Use data from an OPP provider:
const res = await fetch('https://api.openprimitive.com/v1/drugs?name=aspirin');
const data = await res.json();
console.log(data.citations.statement);
// "According to FDA FAERS, aspirin has 601,477 reported adverse events"Implement OPP for your own data:
// 1. Create /.well-known/opp.json (see spec)
// 2. Wrap responses in the OPP envelope
// 3. Optionally sign with Ed25519Full spec: openprimitive.com/protocol.html
Detailed spec: api.openprimitive.com/spec.html
sdk/opp-client.js — Client library for consuming OPP providers
sdk/opp-provider.js — Helper for implementing OPP
sdk/opp-validator.js — Validate OPP conformance
13 tools for Claude, Cursor, and MCP-compatible agents:
npx open-primitive-mcpMIT
This server cannot be deployed
23 MCP tools: compliance, verification, messaging, booking, US contracts. 15 need no key.
Free OpenAI-compatible inference with signed provenance receipts and 3 focused MCP tools.
49 developer tools via MCP: DNS, WHOIS, IP lookup, JWT, hashing, QR, and more.
337 MCP tools with x402 micropayments on Base. $0.001/call. No signup, no API keys.
