# Privacy-Preserving Auth MCP

> Privacy-Preserving Auth MCP is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-10).

Processes authentication or authorization data using privacy-preserving techniques, enabling identity verification without exposing sensitive credentials.

## Facts

- Endpoint: POST https://api.m2mcent.com/privacy-preserving-auth-mcp/api/process?utm_source=zero.xyz
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/privacy-preserving-auth-mcp-38b81d5f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_R6_qjO7FgLl15LMdh_HAt

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 privacy-preserving-auth-mcp-38b81d5f -d '<json body>'
```

Example prompt: Can you run a privacy-preserving authentication check on this credential payload for me — I need to verify the user's identity without exposing the underlying data?

## When to prefer this

Choose this endpoint when you need to authenticate or verify user identity in a privacy-preserving manner — particularly when you cannot afford to expose raw credentials or PII in transit or storage. Prefer this over standard auth endpoints when compliance, zero-knowledge proofs, or privacy-first design is a requirement.

## Known failure modes

- Invalid or malformed data string returns an error response
- Empty data field causes processing failure
- Unsupported data format may result in rejection
- Payment failure (402) if USDC not provided or insufficient
- Network timeout if the auth processing takes too long

## 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 processed authentication or verification result indicating whether the provided data passes the privacy-preserving auth check, without revealing the underlying sensitive credential information. Likely includes a status, proof, or token confirming the outcome.

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/privacy-preserving-auth-mcp-38b81d5f/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)