The agent confirms whether a payment payload or agent grant is valid, checking signatures, timing, and amounts without on-chain costs.

The agent receives a payment payload or agent grant from a user or another agent. It calls the x402_facilitator_verify tool to validate the EIP-712 signature, check the nonce, verify the amount, and ensure the grant has not expired. This step is crucial before proceeding with any service delivery to ensure the payment is legitimate and sufficient.

• Category: Finance and payments
• Effect: Read-only
• MCP servers: AgentPay x402 Facilitator MCP (https://koskamo.com/explore/agentpay-x402-facilitator-mcp)
• Source: AgentPay x402 Facilitator | REST & MCP Payment Tools (https://x402-agent-pay.com/facilitator.html)
• Source quote: "POST /x402/verify Validate a PaymentPayload or Agent Grant — EIP-712 (EVM). Checks signature, timing, nonce, amount. No on-chain call. Free."
• Playbook page: https://koskamo.com/explore/use-cases/verify-x402-payment-signatures

Prompt: Verify if this payment payload is valid: {"paymentPayload": {"network": "base", "scheme": "exact", "payload": {"from": "0x...", "to": "0x...", "value": "1000", "validAfter": "0", "validBefore": "9999999999", "nonce": "0x...", "signature": "0x..."}, "paymentRequirements": {"maxAmountRequired": "1000", "network": "base"}}}