Veil Protocol — PQC Payments + Private AI#

Veil Protocol makes autonomous agents quantum-resistant. It provides four tools for ML-DSA-65 payment signing, payment verification, private DeFi planning via Ghost AI (running inside Octra Circles FHE), and ML-KEM-768 payload encryption. All tools are available immediately via the MCP server — no API key needed.

Setup (MCP)#

Add to your MCP client config ( claude_desktop_config.json, cursor_mcp.json, etc.):

json

{
  "mcpServers": {
    "veil-protocol": {
      "command": "npx",
      "args": ["@veil_/agent-registry"]
    }
  }
}

Alternatively, install as a package:

bash

npm install @veil_/agent-registry

Tools#

veil_sign_payment#

Sign a quantum-resistant payment using ML-DSA-65 (the x402-pqc standard).

Use when: The user wants to make a payment that is secure against quantum computers, or when a service requires an X-Payment-PQC header.

Parameters:

• amount — decimal string, e.g. "12.50"
• currency — "USDC", "ETH", or "VEIL"
• recipient — 0x EVM address of the recipient
• network — "base" or "base-sepolia"

Returns: { signature, publicKey, paymentHeader, txHash }

The paymentHeader is a base64-encoded, ML-DSA-65-signed x402-pqc header ready to attach as X-Payment-PQC to any HTTP request. txHash is a deterministic placeholder (sha3-256 of the header) — the actual on-chain hash is set when the header is broadcast.

---

veil_verify_payment#

Verify a quantum-resistant x402-pqc payment signature.

Use when: A payment header has been presented and you need to confirm it is valid, correctly signed, and matches the expected amount and recipient.

Parameters:

• paymentHeader — base64-encoded x402-pqc header (value of the X-Payment-PQC header)
• expectedAmount — amount string to match, e.g. "12.50"
• expectedRecipient — 0x address that should have been paid

Returns: { valid: boolean, details } — details includes payer, amount, recipient, timestamp, or an error string if invalid.

---

veil_ghost_query#

Query Ghost, Veil's private AI agent, for DeFi intent parsing and execution planning. Ghost executes inside Octra Circles — sealed FHE environments where no network node sees the instruction in plaintext.

Use when: The user gives a natural-language DeFi instruction (swap, lend, stake, bridge, etc.) and you need to parse it into a structured execution plan privately.

Parameters:

• instruction — natural language DeFi intent, e.g. "swap 100 USDC for ETH on base"
• context (optional) — { balances: { "USDC": "500.00" }, network: "base" }

Returns: { intent, confidence, ghostResponse, executionPlan }

executionPlan.steps is an array of structured actions; ghostResponse is a human-readable confirmation from Ghost. When confidence is low or intent.action is "unknown", ask the user to rephrase.

---

veil_encrypt_payload#

Encrypt a payload for a recipient using ML-KEM-768 key encapsulation + AES-256-GCM.

Use when: Sensitive data (wallet addresses, keys, private instructions) must be encrypted in a way that is secure against quantum computers, and you have the recipient's ML-KEM-768 public key.

Parameters:

• payload — string to encrypt
• recipientPublicKey — hex-encoded ML-KEM-768 public key (1184 bytes = 2368 hex chars)

Returns: { encryptedPayload, kemCiphertext } — encryptedPayload is a base64-encoded JSON of the AES ciphertext + nonce; kemCiphertext is hex-encoded ML-KEM-768 ciphertext the recipient uses to recover the AES key.

---

Trigger phrases#

User saysTool to call"Sign a payment of … to …"veil_sign_payment"Make a quantum-resistant payment"veil_sign_payment"Verify this payment header"veil_verify_payment"Is this x402 payment valid?"veil_verify_payment"Swap / stake / lend / bridge …" (private)veil_ghost_query"Parse this DeFi intent privately"veil_ghost_query"Encrypt … with ML-KEM"veil_encrypt_payload"Post-quantum encrypt this payload"veil_encrypt_payload

Example interactions#

Signing a payment

"Sign a 12.50 USDC payment to 0xabc123 on base-sepolia"

text

veil_sign_payment({ amount: "12.50", currency: "USDC", recipient: "0xabc123", network: "base-sepolia" })

Private DeFi planning

"I have 500 USDC. Swap 100 of it for ETH on base, privately."

text

veil_ghost_query({
  instruction: "swap 100 USDC for ETH on base",
  context: { balances: { USDC: "500.00" }, network: "base" }
})

Encrypting sensitive data

"Encrypt my wallet seed phrase with the coordinator's public key: 0xabcd…"

text

veil_encrypt_payload({ payload: "abandon able about...", recipientPublicKey: "0xabcd..." })

Notes#

• Payment signing generates a fresh ephemeral ML-DSA-65 keypair per call. For persistent identity across payments, provide your own keypair via @veil_/pqc-wallet directly.
• Ghost AI falls back to a local mock when api.veilprotocol.net is unreachable. The mock still parses intent but does not execute FHE. Confidence scores reflect local parsing only.
• All contracts are on Base Sepolia testnet only. Mainnet deployment is pending a formal security audit.
• Source: https://github.com/veil-protocol-1/veil-pqc