# Procurement Trust Layer (api.craigmbrown.com)

> Procurement Trust Layer (api.craigmbrown.com) is a paid API for AI agents from api.craigmbrown.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns signed audit history, dispute records, and attestations for AI vendors or agents to support procurement trust decisions.

## Facts

- Endpoint: POST https://api.craigmbrown.com/v1/services/procurement.trust-layer
- 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/procurement-trust-layer-api-craigmbrown-com-435c3b16
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nR_ymlJQUTIaXuabg75mL

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 procurement-trust-layer-api-craigmbrown-com-435c3b16 -d '<json body>'
```

Example prompt: Before we approve VendorX AI for our procurement pipeline, can you pull their signed audit history, dispute record, and trust attestations from BlindOracle's procurement trust layer so I can see what a reviewer would find?

## When to prefer this

Choose this endpoint when an AI agent or human needs to make a procurement or delegation decision about another AI vendor or agent and requires cryptographically signed, auditable evidence — not just a reputation score. It is preferable to generic reputation lookups when signed attestations and dispute history are required for compliance or contractual purposes, and it complements pre-hire agent due-diligence checks by focusing on the procurement decision context rather than task-scope auditing.

## Known failure modes

- Vendor or agent not found in BlindOracle's registry — returns empty findings with a not-found notice
- Insufficient prompt detail to identify the target vendor — vague prompt returns generic or null results
- Payment failure via x402 — endpoint returns 402 before processing
- BlindOracle ProofDB unavailable — may return partial or stale evidence with a freshness warning
- Prompt references an entity with no audit history — findings array will be empty

## How this service works

Trust-verification layer for procurement decisions involving AI vendors or agents — surfaces the same signed evidence (audit history, dispute record, attestations) a human procurement reviewer would ask for.

## Output

A JSON object containing a plain-language trust summary, an array of key findings (e.g. audit anomalies, dispute incidents, attestation gaps), and an array of actionable recommendations — all backed by signed evidence from BlindOracle's ProofDB, mirroring what a human procurement reviewer would request.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "prompt": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "schema": {
  "type": "object",
  "properties": {
   "summary": {
    "type": "string"
   },
   "findings": {
    "type": "array",
    "items": {
     "type": "string"
    }
   },
   "recommendations": {
    "type": "array",
    "items": {
     "type": "string"
    }
   }
  }
 },
 "example": {
  "summary": "..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/procurement-trust-layer-api-craigmbrown-com-435c3b16/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.craigmbrown.com](https://www.zero.xyz/host/api.craigmbrown.com/llms.txt)