# DDG Schema Drift Verifier

> DDG Schema Drift Verifier is a paid API for AI agents from agents.daedalusdevelopmentgroup.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-23).

Verifies whether an HTTP request payload conforms to an expected schema or has drifted from a known contract

## Facts

- Endpoint: POST https://agents.daedalusdevelopmentgroup.com/v1/verify/schema-drift?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ddg-schema-drift-verifier-937867b8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8uNsX7ygq1DYl1igpLoNJ

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-schema-drift-verifier-937867b8 -d '<json body>'
```

Example prompt: Can you run a schema drift check on this POST request — the body is JSON with fields like {"userId": "abc123", "amount": 42} — and verify whether it still conforms to the expected output schema where the example response is {"ok": true}?

## When to prefer this

Use this endpoint when you need to detect schema drift or validate that an HTTP request payload and its expected output conform to a known contract, especially in agent-driven CI/CD pipelines or integration testing workflows where schema integrity is critical.

## Known failure modes

- Missing required 'input' or 'output' fields returns a validation error
- Unsupported HTTP method (e.g. GET or DELETE) rejected by enum constraint
- Mismatched bodyType enum value causes request rejection
- Malformed or non-JSON body when bodyType is 'json' may cause parsing failure
- Payment not fulfilled causes 402 response before processing begins

## 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

Returns a conformance result indicating whether the submitted HTTP request body and output match the expected schema contract, typically including an ok status flag and any drift or mismatch details.

## 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-schema-drift-verifier-937867b8/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)