# Agent Rest Stop – Allowlist Stamp

> Agent Rest Stop – Allowlist Stamp is a paid API for AI agents from agent-gas-station.agent-gas-station.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Checks whether a given address passes or fails against a named allowlist stored in Cloudflare R2.

## Facts

- Endpoint: POST https://agent-gas-station.agent-gas-station.workers.dev/v1/AllowlistStamp?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-rest-stop-allowlist-stamp-ffb082fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_q-DzRsaFFzgFm2ZvbnSWU

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-rest-stop-allowlist-stamp-ffb082fb -d '<json body>'
```

Example prompt: Check if the address 0xAbC123...def is on the allowlist with list ID 'vip-holders' and tell me whether it passes or fails.

## When to prefer this

Use this endpoint when you need a simple binary pass/fail check of an address against a named, pre-stored allowlist in R2. Prefer this over floor-based or pair-based checks when the list is explicitly enumerated (not rule-derived). Ideal for token-gated access, agent permission walls, or any scenario where the allowed set is a discrete list rather than a computed threshold.

## Known failure modes

- Address not found in the specified list returns a fail result
- Invalid or missing list_id may return an error or fail
- Malformed address string may cause a validation error
- R2 storage unavailability could cause a service error
- Payment not received (x402) results in a 402 rejection before the check runs

## How this service works

Pass or fail against a list stored in R2.

## Output

A pass or fail result indicating whether the provided address is present (and permitted) in the specified allowlist stored in R2. No partial data — the response is a binary membership verdict for that address/list pair.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "address": {
   "type": "string"
  },
  "list_id": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-rest-stop-allowlist-stamp-ffb082fb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-gas-station.agent-gas-station.workers.dev](https://www.zero.xyz/host/agent-gas-station.agent-gas-station.workers.dev/llms.txt)