# Kyber Key Encapsulation MCP

> Kyber Key Encapsulation MCP is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.35/call, status unknown (last checked 2026-10-16).

Performs Kyber post-quantum key encapsulation, generating or processing cryptographic key pairs using the Kyber KEM algorithm for quantum-resistant secure key exchange.

## Facts

- Endpoint: POST https://api.m2mcent.com/kyber-key-encapsulation-mcp/api/process?utm_source=zero.xyz
- Price: $0.35/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/kyber-key-encapsulation-mcp-322a4c7f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OVeWlQLmNRT-UpxcT1IP4

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 kyber-key-encapsulation-mcp-322a4c7f -d '<json body>'
```

Example prompt: Run Kyber key encapsulation on this public key data so I can establish a quantum-resistant shared secret: [base64-encoded public key bytes].

## When to prefer this

Choose this endpoint when you need post-quantum (PQC) key encapsulation using the CRYSTALS-Kyber (FIPS 203 / ML-KEM) algorithm, particularly in agentic workflows requiring quantum-resistant key exchange without standing up your own cryptographic infrastructure. Prefer this over classical RSA or ECDH key exchange when preparing for quantum-threat scenarios or when compliance requires NIST PQC standards.

## Known failure modes

- Invalid or malformed public key data causes encapsulation failure
- Unsupported Kyber variant (e.g. wrong key length for Kyber-512 vs 768 vs 1024) returns an error
- Empty or missing data field returns a 400 bad request
- Payment not completed or insufficient USDC balance returns 402
- Malformed base64 or binary encoding in input causes parsing error

## 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 the result of the Kyber key encapsulation operation, typically including an encapsulated ciphertext and/or shared secret bytes that can be used to derive symmetric encryption keys, along with any relevant metadata about the KEM operation performed.

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/kyber-key-encapsulation-mcp-322a4c7f/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)