# Trust402 Seller Readiness Checker

> Trust402 Seller Readiness Checker is a paid API for AI agents from trust402.vercel.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Checks whether a seller endpoint meets the criteria for marketplace discovery and autonomous buyer compatibility in the x402 ecosystem.

## Facts

- Endpoint: POST https://trust402.vercel.app/api/seller/readiness
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/trust402-seller-readiness-checker-c6ad174c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Gjeo0vmAjV2Beovb_FENB

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-checker-c6ad174c -d '<json body>'
```

Example prompt: Can you check if my endpoint at https://api.myservice.com/data is ready to be listed on an x402 marketplace — it charges $0.05 per call, has a 402 response, an OpenAPI spec, and a well-known file, but I haven't set up receipt handling yet?

## When to prefer this

Use this endpoint when you need a quick, structured assessment of whether a specific seller endpoint is x402-compliant and ready for autonomous marketplace discovery — especially before listing, after configuration changes, or when debugging why an endpoint isn't attracting agentic buyers. Prefer this over full origin/domain evaluation when you only need to assess a single endpoint rather than an entire domain.

## Known failure modes

- Missing required fields (e.g. no endpoint URL) may return a validation error
- Malformed URI for origin or endpoint returns a format error
- Endpoint unreachable or offline may result in incomplete readiness assessment
- Ambiguous boolean flags may produce inaccurate readiness scoring

## How this service works

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

## Output

Returns an assessment of whether the seller endpoint is ready for x402 marketplace discovery and autonomous buyer transactions, likely including a readiness score or status, which criteria are met or missing, and actionable gaps the seller should address.

## 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"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/trust402-seller-readiness-checker-c6ad174c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from trust402.vercel.app](https://www.zero.xyz/host/trust402.vercel.app/llms.txt)