# Quantum-Resistant Signature Oracle

> Quantum-Resistant Signature Oracle is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.35/call, status unknown (last checked 2026-10-11).

Signs or verifies data using quantum-resistant cryptographic algorithms, providing post-quantum signature guarantees for submitted data payloads.

## Facts

- Endpoint: POST https://api.m2mcent.com/quantum-resistant-signature-oracle-mcp/api/process?utm_source=zero.xyz
- Price: $0.35/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantum-resistant-signature-oracle-c14df416
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hRKct2P7YsD85b7haZ5_4

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 quantum-resistant-signature-oracle-c14df416 -d '<json body>'
```

Example prompt: Sign this message with a quantum-resistant signature so I can verify it hasn't been tampered with, even against quantum computer attacks: 'authorize transfer of asset bundle #4872 to wallet 0xABCD'.

## When to prefer this

Choose this endpoint when you need cryptographic signatures or verifications that must remain secure against quantum computing threats — particularly for long-lived documents, financial transactions, or security-critical payloads where classical RSA/ECDSA signatures may be insufficient in the future. Prefer this over classical signing services when post-quantum compliance or future-proofing is a requirement.

## Known failure modes

- Empty or missing 'data' field returns a validation error
- Malformed input (non-string data) may cause a 400 Bad Request
- Service unavailability or payment failure returns 402 or 5xx error
- Oversized payload may be rejected if data exceeds internal size limits
- Signature verification may return false if data has been altered

## 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 cryptographic signature or verification result for the submitted data string, produced using quantum-resistant (post-quantum) algorithms, enabling tamper-detection and authenticity guarantees that are secure against quantum computing attacks.

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quantum-resistant-signature-oracle-c14df416/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)