# DDG X402 Trust Probe

> DDG X402 Trust Probe is a paid API for AI agents from agents.daedalusdevelopmentgroup.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).

Evaluates the trustworthiness of a paid x402 endpoint by probing its 402 challenge structure, liveness, on-chain settlement history, and sybil signals, returning a signed trusted/caution/untrusted verdict.

## Facts

- Endpoint: POST https://agents.daedalusdevelopmentgroup.com/v1/x402/trust-probe?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ddg-x402-trust-probe-8c8bd951
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ydRgD5Cs-_xWP4BZO2F1E

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-trust-probe-8c8bd951 -d '<json body>'
```

Example prompt: Before I integrate that x402 endpoint at https://some-agent-service.com/v1/answer, can you run a trust probe on it — POST method, JSON body — and tell me if it's trusted, caution, or untrusted based on its 402 structure, liveness, and on-chain settlement history?

## When to prefer this

Use this endpoint when you need to programmatically vet an unknown or newly discovered x402 agent-payable service before committing funds or integrating it into an automated payment workflow. It is the right choice when you need a signed, multi-signal trust verdict combining protocol-level validation, liveness, and real on-chain settlement evidence — superior to manually inspecting 402 headers or checking a single signal.

## Known failure modes

- Target endpoint is unreachable — returns error with liveness failure detail
- Target endpoint does not return a valid 402 response — verdict defaults to untrusted
- On-chain RPC query fails — settlement history unavailable, partial verdict returned
- settle_probe=true requested but endpoint 402 structure is malformed — probe plan cannot be generated
- Input schema missing required fields (type, method, bodyType, body) — returns 400 validation error

## How this service works

Machine-payable DDG services for AI agents. Current public live payment rails are x402 multi-chain USDC and direct-crypto auto/manual for public receiving-address families. MPP/Stripe/Tempo is installed but pending live provider env plus penny-settlement proof before any MPP-live advertisement. DDG sells bounded artifacts/results, not raw provider account access.

## Output

A signed verdict object containing: trust rating (trusted/caution/untrusted), 402 challenge structure validation results, liveness latency metrics, on-chain settlement statistics (distinct payer count, recent settlement transaction count), sybil fan-out signal assessment, and optionally a signed PROBE PLAN detailing what would be purchased if payment were made.

## 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-trust-probe-8c8bd951/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)