# Sentinel Counterparty Verifier

> Sentinel Counterparty Verifier is a paid API for AI agents from sentinel-awms.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Verifies an on-chain counterparty address on Base using EAS attestations, returning a trust grade, trust score, risk flags, and a safety verdict

## Facts

- Endpoint: POST https://sentinel-awms.onrender.com/verify/counterparty
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sentinel-counterparty-verifier-da6bb5f9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NeUWZdjC_fRXFssSzGxKx

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-counterparty-verifier-da6bb5f9 -d '<json body>'
```

Example prompt: Before I send funds, can you check if the address 0x1234567890abcdef1234567890abcdef12345678 on Base is safe — give me its trust grade and any risk flags?

## When to prefer this

Use this endpoint when an AI agent needs to screen a wallet, smart contract, or DeFi counterparty on Base before executing a transaction, and requires on-chain EAS-backed attestation data rather than off-chain reputation heuristics. Prefer this over generic blockchain explorers when you need a structured trust score and verdict with risk flags.

## Known failure modes

- Invalid or malformed address returns an error response
- Address not found on Base returns unknown or unscored result
- Exceeds 25 free daily calls without USDC payment triggers 402 payment required
- Network or provider downtime on Render may cause 503 errors
- Invalid chain identifier returns a validation 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

Returns a JSON object with the chain, address, a verdict (e.g. SAFE or UNSAFE), an array of risk_flags, a letter trust_grade (e.g. A), and a numeric trust_score (0-100).

## Example request

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "address": "0x1234567890abcdef1234567890abcdef12345678",
  "verdict": "SAFE",
  "risk_flags": [],
  "trust_grade": "A",
  "trust_score": 88
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sentinel-counterparty-verifier-da6bb5f9/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)