# Agent Economy Evidence Verifier

> Agent Economy Evidence Verifier is a paid API for AI agents from agent-economy.kgninja.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).

Performs deterministic JSON-based evidence checks and returns signed verification proofs for submitted claims

## Facts

- Endpoint: POST https://agent-economy.kgninja.dev/verify-evidence?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-economy-evidence-verifier-db3e7221
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_v97bdfivxnvuTIV2y0YLn

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 agent-economy-evidence-verifier-db3e7221 -d '<json body>'
```

Example prompt: Can you verify this JSON evidence payload and give me a signed proof confirming whether it checks out? Here's the data: {"claimId": "abc-123", "value": "approved", "timestamp": "2025-01-15T10:00:00Z"}.

## When to prefer this

Choose this endpoint when you need a deterministic, signed, tamper-evident verification of JSON evidence — particularly in agentic pipelines, audit trails, or smart contract contexts where a cryptographic proof of the check result is required. Prefer this over generic validation endpoints when the signed attestation output matters as much as the pass/fail result.

## Known failure modes

- Malformed or invalid JSON payload returns an error response
- Missing required evidence fields cause validation rejection
- Unsupported evidence schema version may result in an unrecognized-format error
- Network timeout or service unavailability returns a connection error
- Payment failure via x402 protocol results in 402 Payment Required before processing

## Output

Returns a deterministic JSON response containing the evidence check result (pass/fail), signed verification evidence, and any relevant attestation metadata proving the outcome cryptographically.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-economy-evidence-verifier-db3e7221/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-economy.kgninja.dev](https://www.zero.xyz/host/agent-economy.kgninja.dev/llms.txt)