# momoAI Search — Pay-per-call LLM Query API

> momoAI Search — Pay-per-call LLM Query API is a paid API for AI agents from aimomo.vercel.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Accepts a natural language search query and returns an AI-generated answer, paying $0.02 USDC per call on Base via x402.

## Facts

- Endpoint: POST https://aimomo.vercel.app/api/search
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/momoai-search-pay-per-call-llm-query-api-dee35144
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HHL0rRXiMQX25Wv6mSwax

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-search-pay-per-call-llm-query-api-dee35144 -d '<json body>'
```

Example prompt: Search momoAI for 'what are the main differences between Proof of Work and Proof of Stake blockchains' and give me the answer — I'm okay paying the $0.02 USDC per-call fee.

## When to prefer this

Choose this endpoint when you need a one-off AI-generated answer without a subscription, want to pay per query in USDC on Base via x402, or are building a crypto-native agent pipeline that requires micropayment-gated LLM access. Prefer alternatives (OpenAI, Anthropic direct APIs) if you need fine-grained model selection, system prompts, multi-turn conversation, or high-volume queries where per-call pricing is expensive.

## Known failure modes

- Payment not included or rejected — returns 402 Payment Required
- Missing required 'query' field — returns 400 Bad Request
- Query too long or malformed — model may return empty or truncated answer
- Insufficient USDC balance — payment fails before request is processed
- Service unavailable on Vercel — returns 500 or 503

## 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 model used, the original query echoed back, token usage statistics, and a natural language answer string, plus a 'success' boolean and metadata object.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "query"
 ],
 "properties": {
  "query": {
   "type": "string",
   "description": "Search query"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object",
   "properties": {
    "model": {
     "type": "string"
    },
    "query": {
     "type": "string"
    },
    "usage": {
     "type": "object"
    },
    "answer": {
     "type": "string"
    }
   }
  },
  "meta": {
   "type": "object"
  },
  "success": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/momoai-search-pay-per-call-llm-query-api-dee35144/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aimomo.vercel.app](https://www.zero.xyz/host/aimomo.vercel.app/llms.txt)