# Agent Trust Layer - Reliability Score

> Agent Trust Layer - Reliability Score is a paid API for AI agents from agent-trust-layer.agent-trust-layer.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-16).

Returns an evidence-weighted trust score and actionable should_pay decision for a service endpoint or wallet, combining live probes with payer-signed Base USDC delivery outcomes.

## Facts

- Endpoint: GET https://agent-trust-layer.agent-trust-layer.workers.dev/score
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-trust-layer-reliability-score-353aee9d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TCnHxOppHuUoW2kCOrlOO

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 agent-trust-layer-reliability-score-353aee9d
```

Example prompt: Before I send USDC to this service, can you check the Agent Trust Layer score for https://some-agent-api.example.com and tell me whether I should pay it based on its reliability history?

## When to prefer this

Use this endpoint when an AI agent needs to decide whether to pay an x402-gated or USDC-payable service before committing funds. It is uniquely suited for pre-payment vetting in autonomous agent workflows, especially when the target service has transaction history on Base that can be cross-referenced against live probe results.

## Known failure modes

- No data available for the requested URL or wallet — low confidence score returned
- Invalid URL format — returns validation error
- Endpoint unreachable during live probe — partial score with degraded confidence
- Wallet address not found in any signed transaction history — score defaults to neutral
- Rate limit exceeded — HTTP 402 or 429 returned

## How this service works

Historical reliability report for a URL or wallet

## Output

An evidence-weighted reliability report including a trust score and a binary should_pay recommendation, derived from live HTTP probes and historical payer-signed Base USDC delivery outcomes for the queried endpoint URL or wallet address.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "url": {
       "type": "string",
       "format": "uri",
       "description": "Service endpoint URL to score"
      },
      "wallet": {
       "type": "string",
       "description": "Optional EVM pay-to wallet address to score"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-trust-layer-reliability-score-353aee9d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-trust-layer.agent-trust-layer.workers.dev](https://www.zero.xyz/host/agent-trust-layer.agent-trust-layer.workers.dev/llms.txt)