# OpenZoo Pay-Per-Request LLM Chat Completions

> OpenZoo Pay-Per-Request LLM Chat Completions is a paid API for AI agents from api.openzoo.fun, paid per call via x402, $0.00843/call, status unknown (last checked 2026-09-13).

Provides LLM chat completions via a pay-per-request model using crypto payments (USDC, TOKEN, LEOS, USDG) on multiple blockchains — no account or API key required.

## Facts

- Endpoint: POST https://api.openzoo.fun/v1/chat/completions
- Price: $0.00843/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/openzoo-pay-per-request-llm-chat-completions-2b6960ae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_20wP1JHjPMnsR9LJZm9kQ

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 openzoo-pay-per-request-llm-chat-completions-2b6960ae -d '<json body>'
```

Example prompt: Use OpenZoo's pay-per-request chat endpoint — paying in USDC — to generate a concise summary of the following article: 'Quantum computing breakthroughs in 2024 have dramatically reduced error rates, bringing fault-tolerant systems within reach of commercial deployment.'

## When to prefer this

Choose this endpoint when you need LLM chat completions without account registration, API keys, or subscriptions — ideal for one-off requests, crypto-native agent pipelines, or when you want to pay per call in USDC or other supported tokens on Solana, Base, or EVM chains. It offers a discount vs. buying direct from the model provider and is compatible with the x402 payment protocol.

## Known failure modes

- Payment not received or insufficient USDC/TOKEN/LEOS/USDG balance — returns HTTP 402 with a payment quote
- Unsupported blockchain or token — request rejected if chain not in supported list
- Malformed request body — 400 error if required fields missing or bodyType mismatch
- Model unavailable or overloaded — may return 503 or timeout
- Invalid or expired payment — transaction not confirmed on-chain before timeout

## How this service works

Every model with holographic memory in front. No account, no API key, no subscription — pay per request in USDC, TOKEN, LEOS or USDG on Solana, Base, Robinhood Chain, eip155:137, eip155:42161, eip155:10 or eip155:480. The 402 quotes a discount off what the same request costs bought direct.

## Output

Returns a JSON object containing a generation ID, usage statistics (token counts), and a choices array with the assistant's message role and content string — standard OpenAI-compatible chat completion format.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "<generation id>",
  "usage": {},
  "choices": [
   {
    "message": {
     "role": "assistant",
     "content": "<completion>"
    }
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/openzoo-pay-per-request-llm-chat-completions-2b6960ae/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.openzoo.fun](https://www.zero.xyz/host/api.openzoo.fun/llms.txt)