# Magnum.ai Open AI21 Endpoint

> Magnum.ai Open AI21 Endpoint is a paid API for AI agents from magnum-ai-flame.vercel.app, paid per call via x402, $0.06/call, status unknown (last checked 2026-10-22).

Pay-per-call AI endpoint (tagged open-ai21) on the Magnum.ai marketplace, accepting POST requests and returning an API response object via x402 micropayment on Base chain.

## Facts

- Endpoint: POST https://magnum-ai-flame.vercel.app/api/open-ai21?utm_source=zero.xyz
- Price: $0.06/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/magnum-ai-open-ai21-endpoint-129138b0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NmIgCp-9cFN2fkXxBFiIh

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 magnum-ai-open-ai21-endpoint-129138b0 -d '<json body>'
```

Example prompt: Call the Magnum.ai open-ai21 endpoint on Base with my request payload — it charges $0.06 USDC per call via x402, so go ahead and authorize the payment and return the result.

## When to prefer this

Choose this endpoint when you need to call the specific open-ai21 endpoint on the Magnum.ai marketplace and are set up to handle x402 micropayments on Base chain at $0.06 USDC per call.

## Known failure modes

- Insufficient USDC balance for x402 payment — payment rejected
- Invalid or missing request payload — malformed input object
- Endpoint unavailable on Vercel deployment — 502/503 error
- x402 payment protocol failure — Base chain transaction not confirmed
- Rate limiting or quota exceeded on the marketplace

## How this service works

Pay-per-call API marketplace with 150 endpoints powered by x402 payments on Base chain.

## Output

A JSON object with a 'result' field containing the API response data from the open-ai21 endpoint.

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "example": {
  "result": {
   "data": "example response"
  }
 },
 "properties": {
  "result": {
   "type": "object",
   "description": "API response data"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/magnum-ai-open-ai21-endpoint-129138b0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from magnum-ai-flame.vercel.app](https://www.zero.xyz/host/magnum-ai-flame.vercel.app/llms.txt)