MCP Server
AgentPay x402 Facilitator
com.x402-agent-pay/facilitator
What this MCP does
Verifies x402 payment envelopes and can irreversibly settle approved USDC payments on supported networks.
Capabilities
Tools
2
tools
x402_facilitator_settle
Settle an x402 payment on-chain (irreversible)
IRREVERSIBLE SIDE EFFECT: forwards the envelope to POST https://x402-agent-pay.com/facilitator/settle. The existing facilitator first re-runs verify(), then refuses PAYEE_NOT_SERVED_HERE unless payTo is the AgentPay treasury (0x367F1b3D8Ca90D1e087481a9A40d585Bf3451a03 on Base / 6aCEuwH3PYx99cEmRz45otfxk39uF7ewGhqmvxfXisSG on Solana), then broadcasts via Coinbase CDP and returns a transaction hash. Malformed, unsigned, out-of-scope, or unverified payloads are rejected before any external transfer. This adapter never signs, never holds keys, and never bypasses those gates. Do not call this as a dry run.
Destructive
Open world
Input schema
{'type': 'object', 'required': ['body'], 'properties': {'body': {'type': 'object', 'properties': {'x402Version': {'anyOf': [{'type': 'integer'}, {'type': 'null'}], 'default': None}, 'paymentPayload': {'anyOf': [{'type': 'object', 'properties': {'scheme': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'network': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'payload': {'anyOf': [{'type': 'object', 'properties': {'signature': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'EIP-712 signature over the authorization, or SVM payload signature.'}, 'authorization': {'anyOf': [{'type': 'object', 'properties': {'to': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Payee address. Settlement requires the AgentPay treasury.'}, 'from': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Payer address recovered from the EIP-712 signature.'}, 'nonce': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'value': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'USDC atomic units (6 decimals) authorized by the signature.'}, 'validAfter': {'anyOf': [{'type': 'string'}, {'type': 'integer'}, {'type': 'null'}], 'default': None}, 'validBefore': {'anyOf': [{'type': 'string'}, {'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'accepted': {'anyOf': [{'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'resource': {'anyOf': [{'type': 'string'}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'x402Version': {'anyOf': [{'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'payment_payload': {'anyOf': [{'type': 'object', 'properties': {'scheme': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'network': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'payload': {'anyOf': [{'type': 'object', 'properties': {'signature': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'EIP-712 signature over the authorization, or SVM payload signature.'}, 'authorization': {'anyOf': [{'type': 'object', 'properties': {'to': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Payee address. Settlement requires the AgentPay treasury.'}, 'from': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Payer address recovered from the EIP-712 signature.'}, 'nonce': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'value': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'USDC atomic units (6 decimals) authorized by the signature.'}, 'validAfter': {'anyOf': [{'type': 'string'}, {'type': 'integer'}, {'type': 'null'}], 'default': None}, 'validBefore': {'anyOf': [{'type': 'string'}, {'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'accepted': {'anyOf': [{'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'resource': {'anyOf': [{'type': 'string'}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'x402Version': {'anyOf': [{'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'paymentRequirements': {'anyOf': [{'type': 'object', 'properties': {'asset': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'extra': {'anyOf': [{'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'payTo': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Resource payee. Settlement is served only when this is the AgentPay treasury 0x367F1b3D8Ca90D1e087481a9A40d585Bf3451a03 (Base) or 6aCEuwH3PYx99cEmRz45otfxk39uF7ewGhqmvxfXisSG (Solana).'}, 'amount': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'scheme': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'network': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'resource': {'anyOf': [{'type': 'string'}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'maxAmountRequired': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'maxTimeoutSeconds': {'anyOf': [{'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'payment_requirements': {'anyOf': [{'type': 'object', 'properties': {'asset': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'extra': {'anyOf': [{'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'payTo': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Resource payee. Settlement is served only when this is the AgentPay treasury 0x367F1b3D8Ca90D1e087481a9A40d585Bf3451a03 (Base) or 6aCEuwH3PYx99cEmRz45otfxk39uF7ewGhqmvxfXisSG (Solana).'}, 'amount': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'scheme': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'network': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'resource': {'anyOf': [{'type': 'string'}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'maxAmountRequired': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'maxTimeoutSeconds': {'anyOf': [{'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}}, 'description': 'Exact envelope accepted by POST /facilitator/verify and /facilitator/settle.\n\nThe live Flask unpacker is liberal (v1/v2 names). This schema documents the\nsupported request body and still forwards extra x402 fields the upstream\nalready understands via nested objects.', 'additionalProperties': False}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'additionalProperties': True}
x402_facilitator_verify
Verify an x402 payment without moving funds
Forward an x402 payment envelope to POST https://x402-agent-pay.com/facilitator/verify. Recovers the EIP-712 signer, checks payee/amount/expiry/nonce/USDC balance and spend authority. Free. No gas. No broadcast. Returns isValid plus invalidReason when the payload cannot clear. Authorization still lives in the existing facilitator implementation; this tool only forwards the JSON body.
Read only
Open world
Idempotent
Input schema
{'type': 'object', 'required': ['body'], 'properties': {'body': {'type': 'object', 'properties': {'x402Version': {'anyOf': [{'type': 'integer'}, {'type': 'null'}], 'default': None}, 'paymentPayload': {'anyOf': [{'type': 'object', 'properties': {'scheme': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'network': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'payload': {'anyOf': [{'type': 'object', 'properties': {'signature': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'EIP-712 signature over the authorization, or SVM payload signature.'}, 'authorization': {'anyOf': [{'type': 'object', 'properties': {'to': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Payee address. Settlement requires the AgentPay treasury.'}, 'from': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Payer address recovered from the EIP-712 signature.'}, 'nonce': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'value': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'USDC atomic units (6 decimals) authorized by the signature.'}, 'validAfter': {'anyOf': [{'type': 'string'}, {'type': 'integer'}, {'type': 'null'}], 'default': None}, 'validBefore': {'anyOf': [{'type': 'string'}, {'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'accepted': {'anyOf': [{'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'resource': {'anyOf': [{'type': 'string'}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'x402Version': {'anyOf': [{'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'payment_payload': {'anyOf': [{'type': 'object', 'properties': {'scheme': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'network': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'payload': {'anyOf': [{'type': 'object', 'properties': {'signature': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'EIP-712 signature over the authorization, or SVM payload signature.'}, 'authorization': {'anyOf': [{'type': 'object', 'properties': {'to': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Payee address. Settlement requires the AgentPay treasury.'}, 'from': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Payer address recovered from the EIP-712 signature.'}, 'nonce': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'value': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'USDC atomic units (6 decimals) authorized by the signature.'}, 'validAfter': {'anyOf': [{'type': 'string'}, {'type': 'integer'}, {'type': 'null'}], 'default': None}, 'validBefore': {'anyOf': [{'type': 'string'}, {'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'accepted': {'anyOf': [{'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'resource': {'anyOf': [{'type': 'string'}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'x402Version': {'anyOf': [{'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'paymentRequirements': {'anyOf': [{'type': 'object', 'properties': {'asset': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'extra': {'anyOf': [{'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'payTo': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Resource payee. Settlement is served only when this is the AgentPay treasury 0x367F1b3D8Ca90D1e087481a9A40d585Bf3451a03 (Base) or 6aCEuwH3PYx99cEmRz45otfxk39uF7ewGhqmvxfXisSG (Solana).'}, 'amount': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'scheme': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'network': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'resource': {'anyOf': [{'type': 'string'}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'maxAmountRequired': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'maxTimeoutSeconds': {'anyOf': [{'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'payment_requirements': {'anyOf': [{'type': 'object', 'properties': {'asset': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'extra': {'anyOf': [{'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'payTo': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None, 'description': 'Resource payee. Settlement is served only when this is the AgentPay treasury 0x367F1b3D8Ca90D1e087481a9A40d585Bf3451a03 (Base) or 6aCEuwH3PYx99cEmRz45otfxk39uF7ewGhqmvxfXisSG (Solana).'}, 'amount': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'scheme': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'network': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'resource': {'anyOf': [{'type': 'string'}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}, 'maxAmountRequired': {'anyOf': [{'type': 'string'}, {'type': 'null'}], 'default': None}, 'maxTimeoutSeconds': {'anyOf': [{'type': 'integer'}, {'type': 'null'}], 'default': None}}, 'additionalProperties': False}, {'type': 'object', 'additionalProperties': True}, {'type': 'null'}], 'default': None}}, 'description': 'Exact envelope accepted by POST /facilitator/verify and /facilitator/settle.\n\nThe live Flask unpacker is liberal (v1/v2 names). This schema documents the\nsupported request body and still forwards extra x402 fields the upstream\nalready understands via nested objects.', 'additionalProperties': False}}, 'additionalProperties': False}
Output schema
{'type': 'object', 'additionalProperties': True}
History
Recent tool changes
Added
x402_facilitator_settle
Oct. 2, 2026, 2:40 a.m.
Added
x402_facilitator_verify
Oct. 2, 2026, 2:40 a.m.
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