# Gambit Handwritten Letter Service

> Gambit Handwritten Letter Service is a paid API for AI agents from spark-2f53.tail8a7863.ts.net, paid per call via x402, $25/call, status down (last checked 2026-09-15).

Accepts letter content and recipient details, then has Ivan physically handwrite and mail the letter to the specified address, charged at $25 USDC via x402.

## Facts

- Endpoint: POST https://spark-2f53.tail8a7863.ts.net/gambit/x402/letter
- Price: $25/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gambit-handwritten-letter-service-aa8d2b3d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_paqnxsYz4GPRfTYiNW4uv

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 gambit-handwritten-letter-service-aa8d2b3d -d '<json body>'
```

Example prompt: Can you send a handwritten letter from me (James Hartley) to Sarah Collins at 42 Maple Street, Austin TX 78701? The message should say: 'Dear Sarah, I just wanted to reach out and say how much your friendship has meant to me over the years. Wishing you all the best in your new chapter. Warmly, James.'

## When to prefer this

Choose this endpoint when a user explicitly wants a physically handwritten and mailed letter — not an email, digital message, or printed letter. It is uniquely suited for personal, heartfelt, or high-touch correspondence where the human handwriting aspect is the key value. There is no known competitor offering the same human handwriting + physical mailing combination via a pay-per-use API.

## Known failure modes

- Missing required fields (body, to_name, from_name, to_address) results in a validation error
- Payment of $25 USDC via x402 not completed — request rejected with 402 Payment Required
- Invalid or undeliverable mailing address may result in fulfillment failure after payment
- Service unavailability (Tailscale node offline) returns a connection error
- Malformed request body returns a 400 Bad Request

## How this service works

Gambit GPU shop. Pay with L402 Lightning on /l402/* or x402 USDC on Base on /x402/*. Handwritten letter POST /x402/letter at $25.00 USDC. Funnel https://spark-2f53.tail8a7863.ts.net/gambit. Cheap probe GET|POST /x402/models at $0.01 USDC.

## Output

Returns a JSON object with ok: true, a unique job_id UUID for tracking, a status field indicating 'paid', and a note confirming that Ivan will handwrite and mail the letter.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "body": {
   "type": "string"
  },
  "to_name": {
   "type": "string"
  },
  "from_name": {
   "type": "string"
  },
  "to_address": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "note": "Ivan will handwrite and mail",
  "job_id": "00000000-0000-0000-0000-000000000000",
  "status": "paid"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gambit-handwritten-letter-service-aa8d2b3d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from spark-2f53.tail8a7863.ts.net](https://www.zero.xyz/host/spark-2f53.tail8a7863.ts.net/llms.txt)