Verifiable APIs for
AI AgentsAI AgentsAI Agents.
AI agents need APIs they can trust — with simple, per-call payments and cryptographic proof of execution. FourOTwo is the API hub built for the agent economy.
The Stack
Built for Machines, Not Humans
Four pillars working together so agents can pay, trust, verify, and connect — without ever needing a human in the loop.
Pay-Per-Call
Agents pay per API call using the HTTP 402 protocol. No API keys. No subscriptions. No humans approving invoices. Just machine-native, per-call payments.
HTTP 402 SpecTrust & Feedback
Every API response is signed on-chain. Agents rate results via ERC-8004 registries — bad data gets penalized, good data builds reputation. Trust, earned by machines.
ERC-8004 SpecProof of Execution
Every computation runs inside a Trusted Execution Environment. The result is cryptographically attested — you can verify the risk score was actually computed, not fabricated.
EigenCloudModel Context Protocol
All FourOTwo APIs are also accessible via our MCP server. Plug directly into any MCP-compatible AI agent or framework — no custom integration needed.
MCP StandardAPI Directory
APIs Built for Agents
Every API is verifiable, pay-per-call, and designed for autonomous agents. Two are live — more are coming.
DeFi Risk Intelligence
Deeper yield analysis, impermanent loss detection, and protocol risk scoring for DeFi-native agents.
Governance Analysis
Analyze DAO proposals for treasury drains, social engineering, and governance attacks before your agent votes.
Social Signal Analysis
Real-time sentiment tracking and FUD detection across social platforms. Know the narrative before the market moves.