# C2PA Manifest Structural Checker

> C2PA Manifest Structural Checker is a paid API for AI agents from reg.chainverdict.xyz, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-15).

Performs a structural analysis of a C2PA content-credential manifest, checking claim generator, assertions, c2pa.actions history, digitalSourceType for AI-trained media declarations, and signing status — without verifying the signature or certificate chain.

## Facts

- Endpoint: POST https://reg.chainverdict.xyz/v1/aiact/c2pa-check
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/c2pa-manifest-structural-checker-23f59680
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HUpoMsU4dJSNPmtCpArso

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 c2pa-manifest-structural-checker-23f59680 -d '<json body>'
```

Example prompt: Can you structurally check this C2PA content-credential manifest for me — specifically look at the claim generator, the c2pa.actions history, whether the digitalSourceType declares trained-algorithmic media, and whether it's signed at all?

## When to prefer this

Use this endpoint when you need a fast, lightweight structural audit of a C2PA content-credential manifest — particularly to detect AI-training media declarations, missing assertions, or unsigned manifests — and you do not need full cryptographic signature or certificate chain verification. Prefer this over full verification tools when the goal is compliance screening, pre-submission checks, or flagging AI-generated content disclosures under the EU AI Act.

## Known failure modes

- Malformed or non-JSON manifest body causes a parse error response
- Missing required C2PA fields result in a report flagging absent components rather than an error
- Manifest is unsigned — reported as a structural finding, not a verification failure
- digitalSourceType absent or unrecognized — flagged in output rather than causing failure
- Input schema mismatch (wrong bodyType or method) returns a 4xx validation error

## How this service works

Structural check of a content-credential manifest: claim generator, assertions, the c2pa.actions history, whether a digitalSourceType actually declares trained-algorithmic media, and whether it is signed at all. Does not verify the signature or the certificate chain.

## Output

Returns a structured report on the C2PA manifest covering: presence and content of the claim generator, list of assertions found, c2pa.actions history entries, whether the digitalSourceType field declares trained-algorithmic (AI-generated) media, and whether the manifest is signed — without performing cryptographic signature or certificate chain verification.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/c2pa-manifest-structural-checker-23f59680/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from reg.chainverdict.xyz](https://www.zero.xyz/host/reg.chainverdict.xyz/llms.txt)