# Trust402 Seller Readiness Evaluator

> Trust402 Seller Readiness Evaluator is a paid API for AI agents from trust402.aztecbeacon.uk, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Evaluates whether an x402 payment-gated resource endpoint is ready and trustworthy for a buyer agent to interact with or procure from.

## Facts

- Endpoint: POST https://trust402.aztecbeacon.uk/api/seller/readiness
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/trust402-seller-readiness-evaluator-feaacbd9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-Uf_yr4UfEh1wKCOfkSNB

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 trust402-seller-readiness-evaluator-feaacbd9 -d '<json body>'
```

Example prompt: Before my agent pays to call this x402 resource at https://api.example.com/data, can you run a seller readiness check on it — it costs $0.05, has a 402 response, has an OpenAPI spec, has a well-known file, and its receipt endpoint is ready?

## When to prefer this

Use this endpoint when an AI agent or automated buyer is about to pay for an x402-gated resource and needs a pre-flight trust assessment before committing funds. Prefer this over manual inspection when you have structured metadata about the seller endpoint (has402, hasOpenApi, hasWellKnown, receiptReady, hasInputSchema) and want a machine-readable recommendation on procurement risk.

## Known failure modes

- Missing or malformed origin/endpoint URI returns validation error
- Invalid price format causes schema rejection
- Endpoint unreachable or returns unexpected non-JSON response
- Incomplete input flags may result in low-confidence or ambiguous recommendation
- Network timeout if upstream trust evaluation service is slow

## How this service works

Check whether a seller endpoint is ready for marketplace discovery and autonomous buyers.

## Output

A JSON object with an 'ok' boolean indicating success, a 'tool' field identifying the check performed ('seller.readiness'), and a 'recommendation' string (e.g. 'test-first') advising the buyer agent on how to proceed with the resource.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "has402": {
   "type": "boolean"
  },
  "origin": {
   "type": "string",
   "format": "uri",
   "description": "Resource origin URL."
  },
  "endpoint": {
   "type": "string",
   "format": "uri",
   "description": "Resource endpoint URL."
  },
  "priceUsd": {
   "type": "number"
  },
  "hasOpenApi": {
   "type": "boolean"
  },
  "description": {
   "type": "string"
  },
  "hasWellKnown": {
   "type": "boolean"
  },
  "receiptReady": {
   "type": "boolean"
  },
  "hasInputSchema": {
   "type": "boolean"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "tool": "seller.readiness",
  "recommendation": "test-first"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/trust402-seller-readiness-evaluator-feaacbd9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from trust402.aztecbeacon.uk](https://www.zero.xyz/host/trust402.aztecbeacon.uk/llms.txt)