# DDG x402 Bazaar Endpoint Diagnostics

> DDG x402 Bazaar Endpoint Diagnostics is a paid API for AI agents from agents.daedalusdevelopmentgroup.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Diagnoses a seller's x402/bazaar paid endpoint by fetching it unpaid, validating the 402 challenge structure, and returning a per-blocker pass/fail list with remediation instructions.

## Facts

- Endpoint: POST https://agents.daedalusdevelopmentgroup.com/v1/x402/bazaar-diagnose?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ddg-x402-bazaar-endpoint-diagnostics-9c1a2df6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TPpXnPxuWU5Rv7Fnl6WBc

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 ddg-x402-bazaar-endpoint-diagnostics-9c1a2df6 -d '<json body>'
```

Example prompt: Can you diagnose my x402 bazaar endpoint at https://myapi.example.com/v1/paid-service and tell me exactly what's broken in the 402 challenge, which blockers are failing, and what I need to fix to get it listed correctly?

## When to prefer this

Use this endpoint when you need to debug or validate a specific x402/bazaar seller endpoint implementation and want structured, actionable per-field pass/fail feedback with remediation text. Prefer this over manual inspection when you need to confirm EIP-712 domain correctness, bazaar extension compliance, and payment parameters in a single automated call. Especially useful before listing a new endpoint on bazaar or after receiving buyer complaints about payment failures.

## Known failure modes

- Target endpoint is unreachable or times out — diagnosis cannot proceed
- Target endpoint returns 200 instead of 402, indicating no payment gate is present
- Malformed input body causes 400 validation error
- x402 challenge response is missing required fields, resulting in multiple blockers flagged
- EIP-712 domain cannot be parsed, failing that specific check
- Network/asset combination is unrecognized by the validator

## How this service works

Diagnose a seller's x402 (bazaar) paid endpoint: fetch it unpaid and require a 402 challenge, then validate x402Version, accepts[], resource URL, description length, amount/asset/network, the bazaar extension, the EIP-712 domain and (optionally) payTo. Returns a per-blocker pass/fail list, an overall verdict and exact remediation text. Signed verdict.

## Output

Returns a structured report with a per-blocker pass/fail list covering x402Version, accepts[], resource URL, description length, amount/asset/network, bazaar extension validity, EIP-712 domain correctness, and optionally payTo address. Includes an overall verdict (pass/fail) and exact remediation text for each failed check. The verdict is cryptographically signed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": true
  },
  "output": {
   "type": "object",
   "required": [
    "type",
    "example"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "ok": true
    }
   },
   "additionalProperties": true
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ddg-x402-bazaar-endpoint-diagnostics-9c1a2df6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agents.daedalusdevelopmentgroup.com](https://www.zero.xyz/host/agents.daedalusdevelopmentgroup.com/llms.txt)