# Nullifier Hash Generator MCP

> Nullifier Hash Generator MCP is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.4/call, status unknown (last checked 2026-10-12).

Generates a cryptographic nullifier hash from input data, enabling zero-knowledge or privacy-preserving protocols to prevent double-spending or double-voting.

## Facts

- Endpoint: POST https://api.m2mcent.com/nullifier-hash-generator-mcp/api/process?utm_source=zero.xyz
- Price: $0.4/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nullifier-hash-generator-mcp-3bd896ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pfBufTnn2Vuqe3h1lK8ft

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 nullifier-hash-generator-mcp-3bd896ac -d '<json body>'
```

Example prompt: Generate a nullifier hash for this commitment data: '0xabc123def456' — I need it for a ZK proof to make sure this token can't be spent twice.

## When to prefer this

Choose this endpoint when you need a fast, on-demand nullifier hash computation for ZK proof systems, anonymous voting, or double-spend prevention without running your own cryptographic infrastructure. Suitable for agents operating in blockchain or privacy-preserving contexts that need a simple REST interface to nullifier generation.

## Known failure modes

- Empty or missing 'data' field returns an error or null hash
- Malformed input string may produce unexpected hash output
- Service unavailability or timeout returns a non-200 response
- Payment failure (x402) if USDC balance is insufficient — request blocked before processing

## 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

A cryptographic nullifier hash string derived from the provided input data, suitable for use in zero-knowledge proof systems, privacy-preserving protocols, or double-spend prevention mechanisms.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nullifier-hash-generator-mcp-3bd896ac/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)