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Gambit Handwritten Letter Service
x402
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.
Price / call$25
Success—
StatusDown
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.
Example use cases
Personal thank-you note to a mentor
“Please send a handwritten letter from me, Alex Rivera, to Dr. Patricia Moore at 15 Oak Avenue, Boston MA 02101. Write: 'Dear Dr. Moore, I wanted to personally thank you for your guidance during my thesis — it made all the difference. With gratitude, Alex.'”
Condolence letter to a grieving friend
“I want to send a handwritten condolence letter to Tom Nguyen at 88 Birchwood Lane, Denver CO 80203, from me, Claire Bennett. The message is: 'Dear Tom, Words feel inadequate right now, but please know you are in my thoughts. I'm so sorry for your loss. With love, Claire.'”
Business appreciation letter to a client
“Send a handwritten letter on behalf of Marcus Webb to our client Linda Forsythe at 200 Commerce Blvd, Suite 5, Chicago IL 60601. Message: 'Dear Linda, It has been a true pleasure working with you this year. Your trust means everything to us. Warm regards, Marcus Webb.'”
Technical details
Endpoint
POSThttps://spark-2f53.tail8a7863.ts.net/gambit/x402/letterWhen to prefer
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.
Side effects
- 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
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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