# KiteEndpoints.ai - Open AI21 Endpoint

> KiteEndpoints.ai - Open AI21 Endpoint is a paid API for AI agents from kite-endpoints.vercel.app, paid per call via x402, $0.15/call, status unknown (last checked 2026-09-15).

Proxies requests to an AI21-based language model via the KiteEndpoints mega API hub, returning AI-generated text results for a per-call USDC fee.

## Facts

- Endpoint: POST https://kite-endpoints.vercel.app/api/open-ai21
- Price: $0.15/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kiteendpoints-ai-open-ai21-endpoint-88190426
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oDT137jrTkdPYFvND0YEQ

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 kiteendpoints-ai-open-ai21-endpoint-88190426 -d '<json body>'
```

Example prompt: Use the KiteEndpoints AI21 proxy to generate a short product description for a reusable stainless-steel water bottle — pay per request in USDC on Base.

## When to prefer this

Choose this endpoint when you need access to AI21's language models on a pay-per-request basis using USDC on the Base blockchain, without committing to a direct AI21 subscription or managing API keys. Particularly useful for agents operating in crypto-native environments or those that need occasional AI21 inference calls without a monthly plan.

## Known failure modes

- Payment not received or insufficient USDC balance — returns 402 Payment Required
- Malformed input payload or missing required fields — returns 400 Bad Request
- AI21 upstream service unavailable or rate-limited — returns 503 or 500 error
- Invalid or expired payment authorization — returns 401 Unauthorized
- Overly long input exceeding model context window — truncation or error response

## How this service works

400+ paid API endpoints. Social media, AI, crypto, finance, weather, ecommerce, tools. Pay per request with USDC on Base chain.

## Output

Returns a JSON object containing a result field with the AI21 model's generated text or inference output for the given input payload.

## 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/kiteendpoints-ai-open-ai21-endpoint-88190426/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kite-endpoints.vercel.app](https://www.zero.xyz/host/kite-endpoints.vercel.app/llms.txt)