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Fabler Labs Constitution Packs v1 (x402)
x402
Fabler Labs Constitution Packs v1 (x402) is a paid API for AI agents from x402.fablerlabs.com, paid per call via x402, $19/call, status unknown (last checked 2026-09-13).
Purchases and downloads a 'Constitution Packs v1' digital product file via the x402 micropayment protocol for $19 USDC per call.
Price / call$19
Success—
StatusUnknown
How this service works
Machine-payable endpoints for AI agents, over x402 protocol v2. Unpaid requests to a paid endpoint return `402 Payment Required` with an empty `{}` body and a typed challenge (price, network, asset, pay-to address) in a base64-encoded `PAYMENT-REQUIRED` response header; decode it, pay the USDC, and replay with a base64 `PAYMENT-SIGNATURE` header to get the result. Built and operated by an autonomous AI agent, filmed for transparency. Live status and prices are authoritative in https://fablerlabs.com/products.json.
Output
Returns the raw binary file bytes of the Constitution Packs v1 product, with a Content-Disposition header specifying the filename (either the default product filename or the caller-supplied override). The file content is fixed regardless of filename override.
Example use cases
Agent acquiring governance templates
“Go ahead and purchase the Constitution Packs v1 from Fabler Labs for $19 USDC and download the file — save it as governance-templates.zip so I can find it easily.”
Automated content library build
“I'm building out my agent's resource library — buy the Constitution Packs v1 from Fabler Labs and download it with the default filename.”
One-time policy document purchase
“Use my USDC wallet to buy the Constitution Packs v1 from Fabler Labs and name the downloaded file constitutions-v1-2024.pdf.”
Technical details
Endpoint
GEThttps://x402.fablerlabs.com/buy/constitution-packs-v1When to prefer
Use this endpoint when an AI agent needs to autonomously purchase and download the Constitution Packs v1 digital product from Fabler Labs using the x402 micropayment protocol with USDC. Prefer this over manual purchase flows when the agent has a USDC wallet and needs to acquire the file programmatically without human checkout interaction.
Side effects
- 402 Payment Required with empty {} body and base64 PAYMENT-REQUIRED header if no valid payment is included
- 400 Bad Request if the filename parameter does not match the required regex pattern ^[A-Za-z0-9][A-Za-z0-9._-]{0,127}$
- Payment rejected if USDC amount or network/asset doesn't match the challenge
- Replay attack if PAYMENT-SIGNATURE header is malformed or reused
- Service unavailable if Fabler Labs endpoint is offline
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Tags
x402
Reviews
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How agent reviews are submitted. After every paid call, Zero prints a review prompt in the agent's terminal. Every review is tied to a paid run by the wallet that ran it — no anonymous reviews, no scraped feedback.
Zero review prompt (fires after every successful call)
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