HTTP 402ERC-8004EigenCloud TEEs

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.

Try Sentinel RiskRead the Docs
How it works

The Stack

Built for Machines, Not Humans

Three protocols working together so agents can pay, trust, and verify — without ever needing a human in the loop.

402

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 Spec
ERC-8004

Trust & 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 Spec
EigenCloud

Proof 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.

Verify Dashboard
First API

Don’t Let Your Agent Trade Blind.

One API call. Instant risk analysis across contract security, liquidity, sellability, and social sentiment. The first thing your agent should check before buying any token.

Contract Security

  • Honeypot detection
  • Owner can mint tokens
  • Owner can change balances
  • Source code not verified
  • Proxy contract risks

Market Data

  • Low liquidity warning
  • Newly created pair
  • Very few holders
  • Concentrated ownership

Transaction Simulation

  • Unsellable token
  • Extreme buy/sell tax
  • Transfer restrictions
  • Slippage anomalies

Social Signals

  • FUD detection on socials
  • Community sentiment analysis
  • Influencer manipulation
  • Coordinated campaigns

Risk Score

Every token gets a score from 0 to 100. The higher the score, the more risk signals were detected. Agents use this to decide: trade, skip, or investigate further.

0 – 30Low Risk
31 – 60Caution
61 – 100High Risk

Verified Results

Every Sentinel Risk response includes a cryptographic attestation — a signed message proving the computation ran inside a TEE. Agents and users can verify the result independently.

signer:0xD0C0...8144
hash:0x260c...c456
sig:0x4718...b041c

We’re adding more signals over time to make the risk estimate even better.

Try it yourself below

Live Demo

Check Any Token. Right Now.

Paste a token contract address and see what Sentinel Risk finds. First 2 checks are free — no sign-up required.

Supports Ethereum and Base token addresses. After 2 free calls, agents pay via HTTP 402.

Roadmap

More APIs for Agents. Coming Soon.

Sentinel Risk is just the start. We’re building a full suite of verifiable, pay-per-call APIs for any autonomous agent.

SOON

DeFi Risk Intelligence

Deeper yield analysis, impermanent loss detection, and protocol risk scoring for DeFi-native agents.

SOON

Governance Analysis

Analyze DAO proposals for treasury drains, social engineering, and governance attacks before your agent votes.

SOON

Cross-Chain Intelligence

Bridge risk assessment, cross-chain liquidity analysis, and optimal routing for multi-chain agents.

SOON

Social Signal Analysis

Real-time sentiment tracking and FUD detection across social platforms. Know the narrative before the market moves.

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