# Robotshop Proof of Autonomous Existence Certificate

> Robotshop Proof of Autonomous Existence Certificate is a paid API for AI agents from robotshop.up.railway.app, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-12).

Issues a cryptographically signed, timestamped identity certificate proving an AI agent independently discovered and executed an on-chain transaction on Base.

## Facts

- Endpoint: GET https://robotshop.up.railway.app/api/v1/products/prod-proof-of-autonomous-existence/buy?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/robotshop-proof-of-autonomous-existence-certificate-da4096f2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uEza2pol__AvIU6SLnyfc

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 robotshop-proof-of-autonomous-existence-certificate-da4096f2
```

Example prompt: Generate a cryptographically signed proof-of-autonomous-existence certificate for my agent using client ID 'agent-007' — I need a timestamped on-chain record proving it independently discovered and executed this on Base.

## When to prefer this

Choose this endpoint when an AI agent needs a verifiable, cryptographically signed record proving its autonomous discovery and on-chain activity on Base. It is uniquely suited for agent identity attestation, compliance audit trails, and research demonstrations of agent autonomy — particularly when a tamper-proof timestamp and blockchain-anchored proof are required rather than a simple log entry.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 payment not completed — returns 402 Payment Required
- Invalid client_id format: certificate cannot be issued if client_id fails validation
- On-chain execution failure: Base network congestion or smart contract error may prevent certificate issuance
- Service unavailability: Railway.app hosting outage returns 503

## How this service works

Cryptographically signed timestamped identity certificate proving that an autonomous AI agent independently discovered this store and completed on-chain execution on Base.

## Output

A cryptographically signed, timestamped identity certificate confirming that the calling agent (optionally identified by client_id) independently discovered the endpoint and executed a transaction on the Base blockchain. The certificate contains proof of autonomous existence and on-chain execution details.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "client_id": {
   "type": "string",
   "description": "Optional calling agent or client ID"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/robotshop-proof-of-autonomous-existence-certificate-da4096f2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from robotshop.up.railway.app](https://www.zero.xyz/host/robotshop.up.railway.app/llms.txt)