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Gambit Handwritten Letter Mail Service
x402
Gambit Handwritten Letter Mail Service is a paid API for AI agents from gambit.barrioenergy.com, paid per call via x402, $25/call, status unknown (last checked 2026-09-15).
Submits a handwritten letter request that is physically handwritten by a person and mailed to a specified recipient, paid via USDC on Base (x402 protocol).
Price / call$25
Success—
StatusUnknown
How this service works
Gambit GPU shop. Humans: /signup ($1 credit), X-API-Key on /v1/*, QR Lightning top-up. Bots: L402 Lightning (LIVE) on /l402/*, x402 USDC on Base on /x402/*, or POST /v1/register ($0) then POST /v1/topup/lightning. Handwritten letter POST /x402/letter at $25.00 USDC. Funnel https://gambit.barrioenergy.com. Free probe GET|POST /x402/models.
Output
Returns a JSON object confirming the order was received and paid, including a unique job_id (UUID), an ok flag set to true, a status of 'paid', and a note confirming that Ivan will handwrite and mail the letter.
Example use cases
Heartfelt condolence letter by mail
“Please send a handwritten letter to Mary Johnson at 456 Oak Avenue, Austin TX 78701 from me — it should say 'Dear Mary, I was so sorry to hear about your loss. You are in my thoughts. With love, Sarah.'”
Business thank-you note to a client
“I need a handwritten thank-you letter mailed to Robert Chen at 789 Corporate Blvd, San Francisco CA 94105 — the message should be 'Dear Robert, thank you for your continued partnership. We truly value working with you. Best, Acme Corp.'”
Personal birthday greeting via post
“Send a handwritten birthday card letter to my grandmother, Eleanor Walsh, at 22 Maple Lane, Portland OR 97201 — write something like 'Dear Grandma, wishing you the happiest birthday! You mean the world to us. All my love, Tommy.'”
Technical details
Endpoint
POSThttps://gambit.barrioenergy.com/x402/letterWhen to prefer
Choose this endpoint when you need a physical, handwritten letter delivered via postal mail rather than a digital message — ideal for personal correspondence, formal thank-you notes, or situations where a tangible human-written letter carries more weight than email or SMS. It is uniquely suited for AI agents operating with x402 USDC payment capabilities on the Base blockchain.
Side effects
- Missing required fields (body, to_name, from_name, to_address) result in a validation error
- Payment failure via x402/USDC on Base results in a 402 Payment Required response
- Invalid or undeliverable mailing address may cause fulfillment failure post-payment
- Network or server errors may return 5xx responses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| body | string | |
| to_name | string | |
| from_name | string | |
| to_address | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"note": "Ivan will handwrite and mail",
"job_id": "00000000-0000-0000-0000-000000000000",
"status": "paid"
}
}Tags
x402
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