morph-x402

Morph x402 — AI Agent Skill

HTTP 402 payment protocol on Morph Mainnet (Chain ID: 2818). Agents can pay for protected resources with USDC (client) and receive payments for services they expose (merchant). All commands output JSON.

Activation Triggers

Use this skill when the user wants to: check x402 support, discover payment requirements for a URL, pay for an x402-protected resource, register as a merchant to receive payments, verify a payment signature, or settle a payment on-chain.

BGW Routing Note

Decide the mode once via the root SKILL.md and docs/social-wallet-integration.md.

• x402-pay and x402-register require --private-key for local signing.
• x402-discover, x402-supported, x402-verify, x402-settle, x402-server do NOT require a private key — they work with any wallet type.
• Social Login Wallet users can still participate in x402 by combining Morph reads with BGW signing:

Social Login Wallet + x402 (Agent orchestration pattern)

Paying for a resource (SLW payer):

1. Morph: x402-discover --url <url>          → get payment requirements (amount, payTo, asset)
2. BGW:   sign EIP-3009 TransferWithAuthorization using TEE
           (pass the requirements from step 1 to BGW's signing flow)
3. Agent: construct PAYMENT-SIGNATURE header from the BGW signature
4. Agent: replay GET <url> with the header    → receive paid content

Receiving payments (SLW merchant):

1. BGW:   resolve wallet address
2. Morph: x402-register --private-key <local-key> --save --name <name>
          (Note: registration requires a local key for EIP-191 signing.
           If the agent only has a SLW, use BGW to sign the registration challenge,
           then pass the JWT to Morph for API key creation — or use a separate local key.)
3. Morph: x402-server / x402-verify / x402-settle work with HMAC credentials only — no private key needed

The key insight: only the signing step needs BGW. All other x402 operations (discover, verify, settle, server) work without a private key.

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Quick Start

pip install requests eth_account eth_abi eth_utils

# Run from repository root
python3 scripts/morph_api.py <command> [options]

No API keys required for client-side commands. Merchant-side commands require HMAC credentials from x402-register.

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Commands

Client (Payer) Side

x402-supported

Query the Morph Facilitator for supported payment schemes and networks.

python3 scripts/morph_api.py x402-supported

x402-discover

Probe a URL to check if it requires x402 payment. Does not pay.

python3 scripts/morph_api.py x402-discover --url https://api.example.com/resource

x402-pay

Pay for an x402-protected resource with USDC. Default max payment: 1.0 USDC.

python3 scripts/morph_api.py x402-pay --url https://api.example.com/resource --private-key 0xKey

# Allow higher payments
python3 scripts/morph_api.py x402-pay --url https://api.example.com/resource --private-key 0xKey --max-payment 5.0

Merchant (Receiver) Side

x402-register

Register a wallet with the Facilitator to get HMAC credentials for merchant operations.

# Register and save credentials locally (encrypted)
python3 scripts/morph_api.py x402-register --private-key 0xKey --save --name myagent

# Register without saving (prints keys once)
python3 scripts/morph_api.py x402-register --private-key 0xKey

x402-verify

Verify a payment signature received from a payer. No on-chain action.

python3 scripts/morph_api.py x402-verify --payload '{"x402Version":2,...}' --requirements '{"scheme":"exact",...}' --name myagent

x402-settle

Settle a verified payment on-chain (triggers USDC transfer from payer to merchant).

python3 scripts/morph_api.py x402-settle --payload '...' --requirements '...' --name myagent

x402-server

Start a local HTTP server with x402 payment protection. Supports dev mode (structural check, no real payments) and verified mode (Facilitator verify + settle).

# Dev mode (no HMAC credentials needed, structural check only)
python3 scripts/morph_api.py x402-server --pay-to 0xWalletAddr --price 0.001 --dev

# Verified mode (requires saved credentials)
python3 scripts/morph_api.py x402-server --pay-to 0xWalletAddr --price 0.001 --name myagent

# Custom port and path
python3 scripts/morph_api.py x402-server --pay-to 0xAddr --price 0.01 --port 9000 --path /api/data --name myagent

Endpoints served: /api/free (free, 200), <paid-path> (402 → verify payment → 200).

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Safety Rules

1. x402-pay enforces --max-payment (default 1.0 USDC). Amounts exceeding the limit are rejected before signing.
2. Always confirm with the user before executing x402-pay — show the amount, recipient, and URL.
3. x402-register only shows secretKey on first creation. If --save is not used, the key is lost.
4. Private keys are used locally for signing only — never sent to any API.
5. EIP-7702 delegated EOAs using legacy SimpleDelegation may fail during x402 settlement — the USDC contract checks isValidSignature for delegated accounts.

Domain Knowledge

• x402 v2 protocol: Coinbase open standard for HTTP 402 payment. Payer signs EIP-3009 TransferWithAuthorization, merchant verifies and settles via Facilitator.
• Payment token: USDC on Morph (0xCfb1186F4e93D60E60a8bDd997427D1F33bc372B, 6 decimals, FiatTokenV2.2)
• Facilitator: https://morph-rails.morph.network/x402 — verifies signatures and settles on-chain
• EIP-3009: gasless USDC transfer authorization. Payer signs; Facilitator calls receiveWithAuthorization on USDC contract.
• HMAC-SHA256: merchant authenticates to Facilitator using MORPH-ACCESS-KEY / MORPH-ACCESS-SIGN / MORPH-ACCESS-TIMESTAMP headers
• Credential storage: HMAC credentials encrypted with AES-256-GCM at ~/.morph-agent/x402-credentials/

Common Workflows

Agent pays for a premium API:

x402-discover --url <url> (check price) → x402-pay --url <url> (sign and access)

Agent monetizes its service (full flow):

agent-register (morph-identity, get agent NFT)
  → x402-register --save --name myagent (get HMAC credentials, agentWallet = payTo)
  → x402-server --pay-to 0xWallet --price 0.001 --name myagent (expose paid HTTP endpoint)
  → other agents call: x402-discover → x402-pay (USDC auto-settles on-chain)

Quick local test (dev mode, no real payments):

x402-server --pay-to 0xAddr --price 0.001 --dev
  → x402-discover --url http://localhost:8402/api/resource
  → x402-pay --url http://localhost:8402/api/resource --private-key 0xTestKey

Cross-Skill Integration

• morph-identity (EIP-8004): agent-register creates the agent identity; x402-register turns its wallet into a payment recipient. Together they enable agent monetization.
• morph-wallet: Use token-balance --token USDC to check USDC balance before paying.
• morph-7702: EIP-7702 delegated EOAs using legacy SimpleDelegation may cause x402 settlement failures. Check with 7702-delegate first.