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Sentinel Preflight Trust Check
x402
Sentinel Preflight Trust Check is a paid API for AI agents from sentinel-awms.onrender.com, paid per call via x402, $0.025/call, status unknown (last checked 2026-09-15).
Runs a pre-transaction trust check on a Base blockchain address, returning a composite trust score, letter grade, risk verdict, and per-dimension checks (token, protocol, position, counterparty) backed by on-chain EAS attestations.
Price / call$0.025
Success—
StatusUnknown
How this service works
Trust infrastructure for autonomous AI agents on Base. Verify protocols, tokens, positions, and counterparties with on-chain EAS attestations. 25 free calls/day, then pay per query in USDC via x402.
Output
Returns a JSON object with: the target address, chain ('base'), a boolean 'proceed' recommendation, a string 'verdict' (e.g. LOW_RISK), a letter 'trust_grade' (A–F), a numeric 'composite_score' (0–100), and a 'checks' object with per-dimension grades or null for token, position, protocol, and counterparty.
Example use cases
Gate DeFi deposits behind trust screening
“My agent wants to deposit funds into a Curve pool on Base. Can you run a Sentinel trust check on the pool's smart contract address and let me know if the trust grade is A or B before it proceeds with the deposit?”
Verify unknown token counterparty risk
“I'm about to have my agent execute a token swap for a lesser-known asset on Base. Run a Sentinel check on the token's address and give me the composite score and risk verdict—I need to know if the counterparty checks out.”
Validate protocol before autonomous position opening
“My autonomous agent is about to open a leveraged position on Aave Base. Can you pull a Sentinel trust assessment on Aave's protocol address, check all four dimensions, and confirm the verdict before the agent goes live?”
Technical details
Endpoint
POSThttps://sentinel-awms.onrender.com/preflightWhen to prefer
Use this endpoint when an AI agent needs to gate an on-chain action on Base behind a trust check — especially before token swaps, DeFi deposits, or any autonomous transaction involving an unknown protocol, token, or counterparty. Prefer it over generic block explorer lookups when you need a structured, scored, attestation-backed verdict rather than raw chain data.
Side effects
- Unknown or unattested address returns null checks and lower composite score
- Invalid Ethereum address format returns 400 error
- Rate limit exceeded (>25 free calls/day) without USDC payment returns 402 Payment Required
- Base RPC or EAS indexer downtime causes 503 or timeout
- Contract not deployed on Base returns protocol check as null
Input
{
"chain": "base",
"detail": "standard",
"address": "0x940181a94A35A4569E4529A3CDfB74e38FD98631"
}Output
{
"meta": {
"cache_hit": false,
"agent_tier": "unknown",
"checks_run": [
"protocol",
"position"
],
"ofac_skipped": false,
"data_freshness": "2026-06-16T17:18:51.260Z",
"response_time_ms": 571,
"sentinel_version": "0.4.0",
"cache_ttl_applied": 300,
"attestation_enabled": false
},
"chain": "base",
"token": null,
"target": "0x940181a94A35A4569E4529A3CDfB74e38FD98631",
"proceed": true,
"verdict": "CAUTION",
"risk_flags": [
"Audit is 25 months old - may not reflect current code",
"TVL volatility: -17.3% in 30 days"
],
"trust_grade": "C",
"counterparty": null,
"checks_summary": {
"token": "not_checked",
"position": "C",
"protocol": "C",
"counterparty": "not_checked"
},
"composite_score": 64,
"recommendations": [
"Monitor TVL trends - rapid outflows may signal issues"
],
"proceed_recommendation": "Proceed with caution — review risk flags"
}Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"checks": {
"token": null,
"position": "C",
"protocol": "B",
"counterparty": null
},
"target": "0x2626664c2603336e57b271c5c0b26f421741e481",
"proceed": true,
"verdict": "LOW_RISK",
"trust_grade": "B",
"composite_score": 74
}
}Tags
x402
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