# Sentinel Protocol Verifier

> Sentinel Protocol Verifier is a paid API for AI agents from sentinel-awms.onrender.com, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-11).

Verifies a DeFi protocol's on-chain address on Base and returns a risk verdict, trust grade, confidence score, and specific risk flags using EAS attestations.

## Facts

- Endpoint: POST https://sentinel-awms.onrender.com/verify/protocol?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sentinel-protocol-verifier-68b42cae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_w7iIcq28xt1TJoK2eGXyA

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sentinel-protocol-verifier-68b42cae -d '<json body>'
```

Example prompt: Can you run a Sentinel trust check on the Base protocol at address 0x2626664c2603336e57b271c5c0b26f421741e481 and tell me the risk verdict, trust grade, and any specific risk flags before I deposit funds?

## When to prefer this

Use this endpoint when an AI agent needs to autonomously assess the safety of a specific DeFi protocol or smart contract on the Base network before executing a transaction or recommending an interaction. Preferred over generic block explorers when you need a structured, machine-readable risk verdict with confidence scores and enumerated risk flags rather than raw on-chain data.

## Known failure modes

- Unknown or unindexed address returns low confidence or insufficient data
- Invalid address format returns a 400-level error
- Network unavailability on Base may delay attestation lookup
- Daily free tier (25 calls) exceeded without USDC payment configured returns 402
- Address on non-Base chain returns unsupported chain error

## 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

A JSON object containing: the chain ('base'), the queried address, a verdict (e.g. LOW_RISK/MEDIUM_RISK/HIGH_RISK), a confidence score (0–1), a trust grade letter (A–F), a numeric trust score (0–100), and an array of specific risk flags such as 'Proxy contract - admin upgrade possible'.

## Example request

```json
{
 "chain": "base",
 "detail": "standard",
 "address": "0x940181a94A35A4569E4529A3CDfB74e38FD98631"
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "address": "0x2626664c2603336e57b271c5c0b26f421741e481",
  "verdict": "LOW_RISK",
  "confidence": 0.88,
  "risk_flags": [
   "Proxy contract (Proxy) - admin upgrade possible"
  ],
  "trust_grade": "B",
  "trust_score": 70
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sentinel-protocol-verifier-68b42cae/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sentinel-awms.onrender.com](https://www.zero.xyz/host/sentinel-awms.onrender.com/llms.txt)