# Fabler Labs Machine Store – Buy Agent Kit (x402)

> Fabler Labs Machine Store – Buy Agent Kit (x402) is a paid API for AI agents from x402.fablerlabs.com, paid per call via x402, $29/call, status unknown (last checked 2026-09-13).

Purchases and downloads the 'agent-kit' product file from the Fabler Labs machine store via the x402 micropayment protocol for $29 USDC per call.

## Facts

- Endpoint: GET https://x402.fablerlabs.com/buy/agent-kit
- Price: $29/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fabler-labs-machine-store-buy-agent-kit-x402-36880eaa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hTQFaQg4LEyOPIhRvED2k

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 fabler-labs-machine-store-buy-agent-kit-x402-36880eaa
```

Example prompt: Buy me the agent-kit from the Fabler Labs machine store using x402 and save it as my-agent-kit.zip.

## When to prefer this

Use this endpoint when an AI agent or automated pipeline needs to programmatically purchase and download the Fabler Labs agent-kit digital product using the x402 micropayment protocol with USDC on-chain. Prefer it over manual purchase flows when the buyer is a machine agent with a crypto wallet capable of handling x402 payment challenges.

## Known failure modes

- 400 Bad Request if the filename parameter contains path separators, quotes, control characters, or exceeds 128 characters or violates the regex pattern
- 402 Payment Required (empty {} body) before payment is submitted — includes base64-encoded PAYMENT-REQUIRED header with price/network/asset/address challenge
- Payment signature rejected if PAYMENT-SIGNATURE header is malformed or the USDC transfer is insufficient
- Network or blockchain confirmation delays causing payment verification to time out

## 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

A binary file download (the agent-kit product) returned as an octet-stream, with a Content-Disposition header reflecting either the product's default filename or the caller-supplied filename override. The file bytes are the purchased product content unchanged.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fabler-labs-machine-store-buy-agent-kit-x402-36880eaa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.fablerlabs.com](https://www.zero.xyz/host/x402.fablerlabs.com/llms.txt)