# DDG Run Receipt Verifier

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

Cryptographically verifies an AI agent run receipt by recomputing input/output/artifact hashes and checking the Ed25519 signature against a JWKS endpoint or inline JWKS

## Facts

- Endpoint: POST https://agents.daedalusdevelopmentgroup.com/v1/run-receipt/verify?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-run-receipt-verifier-633a91ba
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LtWZ5gy3OF6HCybxt4HBq

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-run-receipt-verifier-633a91ba -d '<json body>'
```

Example prompt: Can you verify this agent run receipt for me — here's the HTTP POST input body and the output we received, and I need you to recompute the hashes and check the Ed25519 signature against the published JWKS to confirm it's legitimate?

## When to prefer this

Choose this endpoint when you need a trustless, third-party cryptographic check that an agent run receipt was produced by an authorized signer and that neither the inputs nor outputs were modified after signing. It is especially valuable in compliance, auditing, or multi-party agent pipelines where one party needs to validate work produced by another without relying solely on the originating system's own claims. Prefer it over self-verification when you need an independent, machine-payable attestation service.

## Known failure modes

- Invalid or expired JWKS — signature check fails if the published key has rotated
- Hash mismatch — recomputed hashes do not match those in the receipt, indicating tampering or data corruption
- Malformed input body — missing required fields such as type, method, bodyType, or body causes a 400-level error
- Signature algorithm mismatch — receipt signed with a different algorithm than Ed25519
- Inline JWKS invalid or unparseable — offline verify fails with key parsing error
- Network unavailability — JWKS endpoint unreachable when not using offline mode

## How this service works

Third-party verify of a run receipt: recompute input/output/artifact hashes from supplied material, check the Ed25519 signature against the published JWKS (or an inline jwks for offline verify), and return a verdict.

## Output

A verdict object indicating whether the run receipt is valid, including whether the recomputed input/output/artifact hashes match and whether the Ed25519 signature verified successfully against the JWKS

## 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
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ddg-run-receipt-verifier-633a91ba/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)