# momoAI /api/think — Pay-per-Call LLM Reasoning Endpoint

> momoAI /api/think — Pay-per-Call LLM Reasoning Endpoint is a paid API for AI agents from momoai-cyan.vercel.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-24).

Sends a chat/reasoning prompt to an LLM and returns a generated text response, billed at $0.05 USDC per call via x402 on Base.

## Facts

- Endpoint: POST https://momoai-cyan.vercel.app/api/think?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Success rate: 0% of calls made through Zero
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/momoai-api-think-pay-per-call-llm-reasoning-endpoint-13683e48
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7j5Q7_Fqc1sF_tBV8LVgV

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 momoai-api-think-pay-per-call-llm-reasoning-endpoint-13683e48 -d '<json body>'
```

Example prompt: Use momoAI to review this Python function for bugs and suggest improvements — here's the code: `def add(a, b): return a - b` — keep the response under 300 tokens and set temperature to 0.2.

## When to prefer this

Choose this endpoint when you need a pay-per-call LLM with no subscription, billed in USDC on Base via x402 — ideal for AI agents that need to make occasional or burst LLM calls without committing to a monthly API plan, or when operating in a crypto-native payment context.

## Known failure modes

- Payment not received or insufficient USDC balance — 402 Payment Required returned
- Invalid or missing 'messages' array — 400 Bad Request
- Model overloaded or unavailable — 503 Service Unavailable
- max_tokens set too high for the model context window — truncated or error response
- Malformed message objects in array — validation error
- Network timeout on Vercel serverless function — 504 Gateway Timeout

## How this service works

Pay-per-use LLM API. Chat, reasoning, code review, translation, summarization, data extraction, and more. Pay with USDC on Base.

## Output

Returns a JSON object with a 'data' field containing the generated text content, model name, token usage breakdown (prompt, completion, total), and finish reason. Also includes a 'meta' field with pricing, timestamp, endpoint, and a deep_thinking boolean flag. Top-level 'success' boolean indicates call status.

## Example request

```json
{
 "messages": [
  {
   "role": "user",
   "content": "Review this Python function for bugs and suggest improvements: def add(a, b): return a - b"
  }
 ],
 "max_tokens": 300,
 "temperature": 0.2
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "messages"
 ],
 "properties": {
  "messages": {
   "type": "array"
  },
  "max_tokens": {
   "type": "integer"
  },
  "temperature": {
   "type": "number"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object",
   "properties": {
    "id": {
     "type": "string"
    },
    "model": {
     "type": "string"
    },
    "usage": {
     "type": "object",
     "properties": {
      "total_tokens": {
       "type": "integer"
      },
      "prompt_tokens": {
       "type": "integer"
      },
      "completion_tokens": {
       "type": "integer"
      }
     }
    },
    "content": {
     "type": "string"
    },
    "finish_reason": {
     "type": "string"
    }
   }
  },
  "meta": {
   "type": "object",
   "properties": {
    "model": {
     "type": "string"
    },
    "price": {
     "type": "string"
    },
    "endpoint": {
     "type": "string"
    },
    "timestamp": {
     "type": "string"
    },
    "deep_thinking": {
     "type": "boolean"
    }
   }
  },
  "success": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/momoai-api-think-pay-per-call-llm-reasoning-endpoint-13683e48/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from momoai-cyan.vercel.app](https://www.zero.xyz/host/momoai-cyan.vercel.app/llms.txt)