# NLP Biometric Indexer MCP — Audio Prediction Endpoint

> NLP Biometric Indexer MCP — Audio Prediction Endpoint is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.548849/call, status unknown (last checked 2026-10-13).

Accepts an audio input and returns a boolean biometric prediction result

## Facts

- Endpoint: POST https://api.m2mcent.com/nlp-biometric-indexer-mcp-568/api/execute?utm_source=zero.xyz
- Price: $0.548849/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nlp-biometric-indexer-mcp-audio-prediction-endpoint-06b9ffa9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FeSzThB4u0mLXdi7f6-ED

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 nlp-biometric-indexer-mcp-audio-prediction-endpoint-06b9ffa9 -d '<json body>'
```

Example prompt: Run this audio sample through the NLP biometric indexer and tell me whether the prediction comes back true or false — here's the base64-encoded audio string.

## When to prefer this

Choose this endpoint when you need a simple true/false biometric classification from audio data and are operating within the x402 micropayment protocol on Base L2. It is suitable when the binary prediction output is sufficient and no detailed confidence score or explanation is required.

## Known failure modes

- Missing 'audio' field in request body returns a validation error
- Malformed or non-audio string input may produce unreliable boolean results
- Overly large audio payloads may time out or be rejected
- Insufficient USDC balance for x402 payment will result in 402 Payment Required error
- Network or node availability issues on api.m2mcent.com may cause transient failures

## How this service works

The premier global index of 1,069 monetized MCP nodes across 205 specialized subdomains. Gasless USDC runtime settlements via x402 V2 Spec on Base L2. Save 95% token context.

## Output

Returns a JSON object containing a single boolean field 'prediction', indicating whether the audio input meets the biometric condition modeled by this endpoint (true or false).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "audio"
 ],
 "properties": {
  "audio": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "prediction"
 ],
 "properties": {
  "prediction": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nlp-biometric-indexer-mcp-audio-prediction-endpoint-06b9ffa9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.m2mcent.com](https://www.zero.xyz/host/api.m2mcent.com/llms.txt)