# Groth16 Proof Verifier MCP

> Groth16 Proof Verifier MCP is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.4/call, status unknown (last checked 2026-09-15).

Verifies Groth16 zero-knowledge proofs, confirming whether a submitted proof is cryptographically valid

## Facts

- Endpoint: POST https://api.m2mcent.com/groth16-proof-verifier-mcp/api/process
- Price: $0.4/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/groth16-proof-verifier-mcp-048a280e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZaRd-FrBn93G6M7s7jbCC

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 groth16-proof-verifier-mcp-048a280e -d '<json body>'
```

Example prompt: Can you verify this Groth16 zero-knowledge proof for me and tell me if it's valid? Here's the proof data: <proof_string>.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call Groth16 zero-knowledge proof verification service without setting up your own verifier infrastructure. Ideal for agentic workflows, AI pipelines, or serverless applications that occasionally need to gate access or confirm zkp validity without running a full blockchain node or custom cryptographic backend.

## Known failure modes

- Malformed or incomplete proof data returns a validation error
- Proof that fails cryptographic verification returns an invalid result
- Unsupported proof format or wrong curve parameters causes rejection
- Missing or empty 'data' field returns a bad request error
- Proof data that is not properly encoded (e.g. wrong base encoding) causes parsing failure

## 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 verification result indicating whether the submitted Groth16 proof is cryptographically valid or invalid, typically including a boolean validity flag and possibly error details if the proof fails verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "payload": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/groth16-proof-verifier-mcp-048a280e/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)