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Post-Quantum Confidentiality for Agent Payment Metadata: Hybrid ML-KEM Decision Procedure
x402
Post-Quantum Confidentiality for Agent Payment Metadata: Hybrid ML-KEM Decision Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-18).
Returns a decision procedure for agents on when and how to use hybrid ML-KEM (Kyber) key encapsulation to encrypt x402 payment metadata before it reaches a facilitator, wallet, or settlement rail.
Price / call$0.002
Success—
StatusUnknown
How this service works
Decision procedure for agents that need to encrypt x402 payment metadata before it touches a facilitator, wallet callback, or settlement rail. Covers the hybrid ML-KEM (Kyber) key encapsulation handshake: when to negotiate hybrid ML-KEM plus classical ECDH, when a classical-only peer triggers a downgrade warning, per-rail KEM support checks for Base, Solana, XRPL, TRON, Casper and CSPR, ciphertext integrity verification before decryption, key-rotation cadence for payment-derived keys, and the
Output
A JSON object containing a plain-prose decision procedure (120+ words) covering hybrid ML-KEM negotiation logic, per-rail KEM support (Base, Solana, XRPL, TRON, Casper/CSPR), downgrade warning conditions, ciphertext integrity verification steps, and key-rotation cadence for payment-derived keys. Also includes metadata: service slug, generation timestamp, model used, and generation source (llm, reasoning, or deterministic).
Example use cases
Choosing KEM for multi-rail agent payments
“My agent is about to send x402 payment metadata across Base, Solana, and XRPL — can you pull the hybrid ML-KEM decision procedure so I know which rails actually support post-quantum key encapsulation and what to do when one doesn't?”
Handling classical-only facilitator downgrade
“My x402 facilitator only supports classical ECDH and won't do hybrid ML-KEM — what's the decision procedure for handling that downgrade warning safely before my agent commits a payment?”
Key rotation cadence for payment-derived keys
“How frequently should my agent rotate the encryption keys derived from x402 payment metadata when using hybrid ML-KEM, and what does the ciphertext integrity check look like before I decrypt?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/post-quantum-confidentiality-for-agent-payment-m?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an agent needs specific, authoritative guidance on post-quantum encryption for x402 payment metadata — particularly the hybrid ML-KEM (Kyber) handshake, per-rail KEM support across Base/Solana/XRPL/TRON/Casper, downgrade handling, and key rotation. Prefer it over general cryptography references when the context is specifically x402 agent payment flows and settlement rail compatibility.
Side effects
- Payment required but not provided — returns 402 with payment instructions
- Invalid query parameter values (e.g. meta not 0 or 1) — likely 400 or ignored
- Topic override not recognized — may return generic procedure without topic specificity
- Service unavailable on k2so.wrong.systems — network or 5xx error
- Procedure generated as 'deterministic' may be stale if rail KEM support has changed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"paid": true,
"result": {
"ok": true,
"brief": "plain prose decision procedure (120+ words)",
"model": "deepseek/deepseek-v4-flash-0731",
"topic": "string topic",
"service": "post-quantum-confidentiality-for-agent-payment-m",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "post-quantum-confidentiality-for-agent-payment-m",
"provider": "K-2SO"
}
}Tags
x402
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