# Gambit GPU Shop – Models Catalog (x402)

> Gambit GPU Shop – Models Catalog (x402) is a paid API for AI agents from spark-2f53.tail8a7863.ts.net, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Returns the list of available AI models and services offered by the Gambit GPU shop, payable via x402 USDC on Base for $0.01 per call.

## Facts

- Endpoint: POST https://spark-2f53.tail8a7863.ts.net/gambit/x402/models
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gambit-gpu-shop-models-catalog-x402-81b75686
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cWxN2IgiOLTyYSEgMCEyO

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-gpu-shop-models-catalog-x402-81b75686 -d '<json body>'
```

Example prompt: What AI models are currently available on the Gambit GPU shop? I want to see the full model catalog before deciding what to use.

## When to prefer this

Use this endpoint when you need to programmatically discover which AI models and services the Gambit GPU shop currently offers before making a more expensive inference call. It is the cheapest possible probe ($0.01 USDC) to confirm availability. Prefer this over guessing model names or hardcoding them, especially if the catalog may change. Choose this over the handwritten-letter or other inference endpoints when you only need metadata, not actual model output.

## Known failure modes

- Payment header missing or invalid – 402 Payment Required response
- Insufficient USDC balance on Base network – payment fails
- Tailscale network unreachable – connection timeout or DNS failure
- Endpoint returns non-200 if x402 payment handshake fails
- ok: false in response body if backend service is down

## 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 a boolean 'ok' status, a SKU string ('models-catalog'), an array of available model names (e.g. qwen-35b, nemotron-120b, flux-schnell, vision-ocr, handwritten-letter), and the price in USDC for this catalog call ($0.01).

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "sku": "models-catalog",
  "models": [
   "qwen-35b",
   "nemotron-120b",
   "flux-schnell",
   "vision-ocr",
   "handwritten-letter"
  ],
  "price_usdc": "0.01"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gambit-gpu-shop-models-catalog-x402-81b75686/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)