# DDG C2PA Audio/Video Signing Service

> DDG C2PA Audio/Video Signing Service is a paid API for AI agents from agents.daedalusdevelopmentgroup.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).

Signs audio/video media files with C2PA (Coalition for Content Provenance and Authenticity) cryptographic provenance credentials

## Facts

- Endpoint: POST https://agents.daedalusdevelopmentgroup.com/v1/c2pa/sign-av?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ddg-c2pa-audio-video-signing-service-ab1194fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vEbFX4yZfp1ZYxh1JkZ2d

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-c2pa-audio-video-signing-service-ab1194fb -d '<json body>'
```

Example prompt: Can you sign this video file with C2PA provenance credentials so I can prove it hasn't been tampered with and verify its origin?

## When to prefer this

Choose this endpoint when you need to embed C2PA-standard cryptographic provenance into audio or video files, especially for AI-generated content, journalism, or brand media where tamper-evidence and origin verification are required. Prefer this over generic file storage or metadata tagging services when the goal is interoperable, verifiable content authenticity credentials recognized by the C2PA standard.

## Known failure modes

- Invalid or unsupported media format returns an error
- Missing required input body fields causes a 400 validation error
- Malformed HTTP method (not POST/PUT/PATCH) rejected by schema
- Payment failure via x402 rail blocks the request
- Oversized media payload may timeout or be rejected
- Unsigned or expired credentials on the signing service side cause failure

## How this service works

DDG agent-payable service request

## Output

Returns a confirmation response (ok: true) indicating the media asset has been successfully signed with a C2PA cryptographic manifest, embedding provenance and authenticity metadata directly into the audio/video file.

## 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-c2pa-audio-video-signing-service-ab1194fb/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)