# Agent Rest Stop – RelayCard Forward Pointer Store

> Agent Rest Stop – RelayCard Forward Pointer Store 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).

Stores a forward pointer (relay card) associating a seen_by agent identifier with a registry URL for later lookup.

## Facts

- Endpoint: POST https://agent-gas-station.agent-gas-station.workers.dev/v1/RelayCard?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-relaycard-forward-pointer-store-0ff8e241
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Vou77i0ShBd8PqRjTniJh

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-relaycard-forward-pointer-store-0ff8e241 -d '<json body>'
```

Example prompt: Store a relay card for agent 'crawler-bot-7' pointing to the registry at https://registry.example.com/tools so other agents can find it later.

## When to prefer this

Use this endpoint when an AI agent needs to register a forward pointer or relay card linking an agent identifier to a registry URL, enabling other agents in the network to discover or route to that registry later. Prefer this over manual registry entries when operating within the Agent Rest Stop / agent-gas-station ecosystem.

## Known failure modes

- Missing or malformed registry_url causes rejection
- Invalid seen_by identifier format may result in error
- Duplicate relay card for the same agent/URL pair may be silently overwritten or rejected
- Payment failure (x402) if USDC not provided
- Network timeout from the workers.dev edge runtime

## How this service works

Stores a forward pointer.

## Output

A confirmation that the relay card (forward pointer) has been stored, associating the given seen_by agent identifier with the provided registry URL for future agent lookups and routing.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "seen_by": {
   "type": "string"
  },
  "registry_url": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-rest-stop-relaycard-forward-pointer-store-0ff8e241/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)