# Witnos Service Trust Scorer

> Witnos Service Trust Scorer is a paid API for AI agents from data.crestsystems.ai, paid per call via x402, $0.5/call, status down (last checked 2026-10-12).

Scores an x402 service receiver address for trustworthiness using settlement census data, returning a SPEND/CAUTION/INVESTIGATE recommendation for counterparty due diligence before paying.

## Facts

- Endpoint: GET https://data.crestsystems.ai/data/service-trust/:address?utm_source=zero.xyz
- Price: $0.5/call
- Payment: x402
- Status: down
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/witnos-service-trust-scorer-ae7359a3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YqJEdhg9HPRTE_iWBgHKG

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 witnos-service-trust-scorer-ae7359a3
```

Example prompt: Before my agent pays that x402 service, run a Witnos trust check on receiver address 0x1234abcd5678ef901234abcd5678ef901234abcd and tell me whether it's safe to proceed — SPEND, CAUTION, or INVESTIGATE.

## When to prefer this

Use this endpoint when an AI agent is about to make an x402 micropayment and needs to verify the counterparty receiver address is legitimate and has a credible settlement history. Prefer this over generic wallet lookups when the specific concern is whether an x402 API service is trustworthy to pay, not just whether a wallet exists.

## Known failure modes

- Unknown or unrecognized address returns low-confidence score or INVESTIGATE recommendation
- Invalid address format (not 0x+40hex or valid Solana base58) returns validation error
- Address with zero settlement history may return minimal scoring data
- Service unavailable or payment failure returns HTTP 402 or 5xx error

## How this service works

Witnos service trust: verify an x402 SERVICE before your agent pays it. Scores any receiver address by buyer reach, call volume, endpoint breadth and recency, with a SPEND / CAUTION / INVESTIGATE recommendation. Counterparty due-diligence from the settlement census of ~47k x402 services.

## Output

Returns a scored trust profile for the receiver address including buyer reach, call volume, endpoint breadth, and recency metrics derived from a census of ~47k x402 services, along with a clear SPEND / CAUTION / INVESTIGATE recommendation for whether the agent should proceed with payment.

## 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"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "x402 service receiver address (EVM 0x+40hex or Solana base58)"
      }
     }
    }
   },
   "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/witnos-service-trust-scorer-ae7359a3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from data.crestsystems.ai](https://www.zero.xyz/host/data.crestsystems.ai/llms.txt)