# Sentinel Position Verifier

> Sentinel Position Verifier is a paid API for AI agents from sentinel-awms.onrender.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Verifies a DeFi position on Base using on-chain EAS attestations, returning a trust score, grade, verdict, and risk recommendations for a given protocol address.

## Facts

- Endpoint: POST https://sentinel-awms.onrender.com/verify/position
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sentinel-position-verifier-9b7bc606
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PtbomEn494BgZqnFahZ7O

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-position-verifier-9b7bc606 -d '<json body>'
```

Example prompt: Can you check the trust score for the protocol at 0x2626664c2603336e57b271c5c0b26f421741e481 on Base — I want to know the verdict, trust grade, and whether there are any concerns about my position before I add more liquidity.

## When to prefer this

Use this endpoint when an AI agent needs on-chain, attestation-backed risk assessment for a specific DeFi position or protocol address on Base, especially when the agent needs a structured trust score and actionable recommendations rather than raw contract data. Prefer this over generic block explorers when you need a trust verdict with graded output suitable for autonomous decision-making.

## Known failure modes

- Invalid or malformed protocol address returns an error or null result
- Protocol not indexed on Base returns no attestation data
- Exceeding 25 free daily calls without USDC payment results in a payment-required error (402)
- Network/render cold-start latency may cause timeout on first call
- Unsupported 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 containing the chain (e.g. 'base'), a verdict (e.g. 'CAUTION'), a letter trust grade (e.g. 'C'), a numeric trust score (0–100), a protocol address, and an array of human-readable recommendations such as warnings about TVL trends or other risk signals.

## Example request

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "verdict": "CAUTION",
  "trust_grade": "C",
  "trust_score": 57,
  "recommendations": [
   "Monitor TVL trends - rapid outflows may signal issues"
  ],
  "protocol_address": "0x2626664c2603336e57b271c5c0b26f421741e481"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sentinel-position-verifier-9b7bc606/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)