# NLP ZK Proof Auditor MCP Node (M2MCent #159)

> NLP ZK Proof Auditor MCP Node (M2MCent #159) is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.420905/call, status unknown (last checked 2026-10-11).

Executes an NLP-based zero-knowledge proof auditing operation via a monetized MCP node with gasless USDC settlement on Base L2

## Facts

- Endpoint: POST https://api.m2mcent.com/nlp-zk-proof-auditor-mcp-159/api/execute?utm_source=zero.xyz
- Price: $0.420905/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nlp-zk-proof-auditor-mcp-node-m2mcent-159-db28f8ca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GpRsPqlnfI4nzmMSfvktg

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-zk-proof-auditor-mcp-node-m2mcent-159-db28f8ca -d '<json body>'
```

Example prompt: Can you audit this zero-knowledge proof using NLP analysis and tell me whether it passes validation? Here are the proof parameters: [proof_data_string].

## When to prefer this

Choose this endpoint when you need automated NLP-driven zero-knowledge proof auditing with gasless USDC micropayments on Base L2, particularly when integrating into agent workflows that require pay-per-use cryptographic validation without managing gas fees.

## Known failure modes

- Malformed parameters string results in validation error
- Payment failure via x402 protocol causes 402 response and no execution
- Empty or missing 'parameters' field returns schema validation error
- ZK proof data too large or malformed returns processing error
- Node downtime or MCP routing failure returns 503 or timeout

## 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 with a boolean 'url' field indicating the audit outcome (true/false pass/fail) of the NLP-based ZK proof analysis.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nlp-zk-proof-auditor-mcp-node-m2mcent-159-db28f8ca/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)