# DDG Agent Price Parity Check

> DDG Agent Price Parity Check is a paid API for AI agents from agents.daedalusdevelopmentgroup.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Compares the live x402 price an agent is charged at runtime against discovery-advertised prices and third-party quotes, returning a signed parity verdict with spread analysis and evidence URLs.

## Facts

- Endpoint: POST https://agents.daedalusdevelopmentgroup.com/v1/agent-price-parity-check?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ddg-agent-price-parity-check-bc0e20c3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DfdW9EYbZiVE4qnsl1gw3

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-agent-price-parity-check-bc0e20c3 -d '<json body>'
```

Example prompt: Can you check whether the price I'm actually being charged at runtime for this x402 route matches what was advertised in the discovery manifest, and give me a signed verdict with the spread?

## When to prefer this

Choose this endpoint when an AI agent needs to verify before payment that the x402 price it is being charged at runtime matches what was advertised during discovery across manifests and registries. Ideal for agents operating in adversarial or untrusted environments where price manipulation is a concern, or when building compliance auditing into agentic payment workflows. Prefer this over manual inspection when you need a signed, machine-readable verdict with evidence URLs.

## Known failure modes

- Missing required input body fields returns validation error
- Unresolvable route or unknown manifest returns inconclusive verdict
- Price sources temporarily unavailable may result in partial comparison
- Stale or malformed well-known manifest causes parse error
- Third-party quote format mismatch causes comparison failure

## How this service works

Price-parity check: compares the 402 price an agent is CHARGED (live runtime resolver) against what discovery ADVERTISES (/.well-known/x402 manifest, service registry) and any third-party quote passed in. Returns per-route prices, parity verdict, spread and evidence URLs to re-verify. Deterministic, no outbound calls, signed verdict.

## Output

Returns a structured response containing per-route prices from each source (runtime resolver, well-known manifest, service registry, third-party quote), a boolean parity verdict (ok/not-ok), the price spread in absolute and percentage terms, and evidence URLs for independent re-verification. The verdict is cryptographically signed by DDG.

## 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-agent-price-parity-check-bc0e20c3/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)