# OmniProvider Chat Nano

> OmniProvider Chat Nano is a paid API for AI agents from pay.omnidev.tech, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-17).

Pay-per-call chat completion on the nano tier, returning one assistant message for up to 1000 input and 256 output tokens at $0.006 USDC per call via x402 on Base.

## Facts

- Endpoint: POST https://pay.omnidev.tech/x402/chat-nano?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/omniprovider-chat-nano-d572de3d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qKjkIjDCqrbLsGu7bpPTV

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 omniprovider-chat-nano-d572de3d -d '<json body>'
```

Example prompt: Ask llama-3.1-8b to summarize the following in under 200 tokens: 'Photosynthesis is the process by which plants convert sunlight, water, and carbon dioxide into glucose and oxygen.'

## When to prefer this

Choose this endpoint when you need a very cheap, low-latency single-turn or short multi-turn LLM call (nano tier), pay per call with no subscription, and your input fits within 1000 tokens and output within 256 tokens. Ideal for agents that need occasional LLM inference without committing to a monthly API plan, or for high-volume pipelines where per-call cost control is critical.

## Known failure modes

- Prompt or messages exceed 1000 input token limit — request rejected
- max_tokens exceeds 256 — validation error
- Payment failure or insufficient USDC balance — 402 Payment Required
- Invalid model enum value — 400 Bad Request
- Both prompt and messages absent — 400 Bad Request
- Network timeout before response is returned

## How this service works

Pay-per-call chat completion on the nano tier. One request returns one assistant message, limited to 1000 input and 256 output tokens, at 0.006 USDC per call on Base. Payment settles after the response is produced. A client nonce header makes a retry free of a second charge.

## Output

A single assistant message text in response to the provided prompt or conversation, generated by the selected model (auto, llama-3.1-8b, or kimi-k3), bounded by max_tokens (up to 256). Payment of 0.006 USDC is settled via x402 on Base after the response is produced.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "enum": [
    "auto",
    "llama-3.1-8b",
    "kimi-k3"
   ],
   "type": "string",
   "description": "auto selects the tier model."
  },
  "prompt": {
   "type": "string",
   "description": "Shorthand for one user message; used when messages is absent."
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "developer",
       "user",
       "assistant"
      ],
      "type": "string"
     },
     "content": {
      "type": "string",
      "description": "Message text."
     }
    },
    "additionalProperties": false
   },
   "maxItems": 64,
   "minItems": 1,
   "description": "Conversation, oldest first."
  },
  "max_tokens": {
   "type": "integer",
   "maximum": 256,
   "minimum": 1,
   "description": "Upper bound on output tokens."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/omniprovider-chat-nano-d572de3d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pay.omnidev.tech](https://www.zero.xyz/host/pay.omnidev.tech/llms.txt)