x402-wallet

Decode EIP-712 signing risk fields, permit families, domain pins, and review checklist. receipt-gate-policy first: a $0.001 x402 receipt gate route for agent payment enforcement, followed by wallet signing safety, EIP-712, ERC20 allowance, Permit2, transaction simulation, spend guard, and private-key boundary tools. Start buyer evaluation at https://x402-wallet.558686.xyz/x402/buyer-use-cases or machine JSON https://x402-wallet.558686.xyz/x402/buyer-use-cases.json; checkout contract JSON is https://x402-wallet.558686.xyz/x402/checkout.json. Route payment activation JSON is https://x402-wallet.558686.xyz/x402/route/eip712-signature-risk-decoder/payment-activation.json. Browsers can inspect the quote, but payment requires a buyer-owned runtime that signs and retries the same request with X-PAYMENT. Buyers can download the route-specific first-payment client at https://x402-wallet.558686.xyz/x402/route/eip712-signature-risk-decoder/first-payment-client.mjs, run node first-payment-client.mjs for quote-only checks, then opt into a buyer-owned x402 payment with PAY_REAL_X402=1. Copy-ready first paid request: curl -fsSL https://x402-wallet.558686.xyz/x402/route/eip712-signature-risk-decoder/first-payment-client.mjs -o first-payment-client.mjs && npm install @x402/fetch @x402/core @x402/evm @x402/svm viem @solana/kit @scure/base && PAY_REAL_X402=1 EVM_PRIVATE_KEY=$EVM_PRIVATE_KEY node first-payment-client.mjs. Generic clients can also discover it from the live 402 response headers: the standard Payment-Required header includes firstPaymentClient, paymentClientUrl, and sameRequestRetryRequired pointers; X-First-Payment-Client, X-Download-Install-Then-Pay-Command, and Link rel=payment-client mirror the same handoff.

Scan ERC20 allowance snapshots for unlimited approvals, high USD exposure, unknown spenders, stale approvals, and revoke actions. receipt-gate-policy first: a $0.009 x402 receipt gate route for agent payment enforcement, followed by wallet signing safety, EIP-712, ERC20 allowance, Permit2, transaction simulation, spend guard, and private-key boundary tools. Browsers can inspect the quote, but payment requires a buyer-owned runtime that signs and retries the same request with X-PAYMENT. Buyers can download the route-specific first-payment client at https://x402-wallet.558686.xyz/x402/route/erc20-allowance-risk-scan/first-payment-client.mjs, run node first-payment-client.mjs for quote-only checks, then opt into a buyer-owned x402 payment with PAY_REAL_X402=1. Copy-ready first paid request: curl -fsSL https://x402-wallet.558686.xyz/x402/route/erc20-allowance-risk-scan/first-payment-client.mjs -o first-payment-client.mjs && npm install @x402/fetch @x402/core @x402/evm @x402/svm viem @solana/kit @scure/base && PAY_REAL_X402=1 EVM_PRIVATE_KEY=0x... node first-payment-client.mjs. Generic clients can also discover it from the live 402 response headers: X-First-Payment-Client, X-Download-Install-Then-Pay-Command, and Link rel=payment-client.

Decode EVM calldata selectors, approval risk, native value, and destination review flags. receipt-gate-policy first: a $0.001 x402 receipt gate route for agent payment enforcement, followed by wallet signing safety, EIP-712, ERC20 allowance, Permit2, transaction simulation, spend guard, and private-key boundary tools. Start buyer evaluation at https://x402-wallet.558686.xyz/x402/buyer-use-cases or machine JSON https://x402-wallet.558686.xyz/x402/buyer-use-cases.json; checkout contract JSON is https://x402-wallet.558686.xyz/x402/checkout.json. Route payment activation JSON is https://x402-wallet.558686.xyz/x402/route/evm-transaction-risk-decoder/payment-activation.json. Browsers can inspect the quote, but payment requires a buyer-owned runtime that signs and retries the same request with X-PAYMENT. Buyers can download the route-specific first-payment client at https://x402-wallet.558686.xyz/x402/route/evm-transaction-risk-decoder/first-payment-client.mjs, run node first-payment-client.mjs for quote-only checks, then opt into a buyer-owned x402 payment with PAY_REAL_X402=1. Copy-ready first paid request: curl -fsSL https://x402-wallet.558686.xyz/x402/route/evm-transaction-risk-decoder/first-payment-client.mjs -o first-payment-client.mjs && npm install @x402/fetch @x402/core @x402/evm @x402/svm viem @solana/kit @scure/base && PAY_REAL_X402=1 EVM_PRIVATE_KEY=$EVM_PRIVATE_KEY node first-payment-client.mjs. Generic clients can also discover it from the live 402 response headers: the standard Payment-Required header includes firstPaymentClient, paymentClientUrl, and sameRequestRetryRequired pointers; X-First-Payment-Client, X-Download-Install-Then-Pay-Command, and Link rel=payment-client mirror the same handoff.

Decode EIP-2612 permit and Permit2 typed data into spender, value, deadline, domain, and signing risk flags. receipt-gate-policy first: a $0.009 x402 receipt gate route for agent payment enforcement, followed by wallet signing safety, EIP-712, ERC20 allowance, Permit2, transaction simulation, spend guard, and private-key boundary tools. Browsers can inspect the quote, but payment requires a buyer-owned runtime that signs and retries the same request with X-PAYMENT. Buyers can download the route-specific first-payment client at https://x402-wallet.558686.xyz/x402/route/permit-permit2-decoder/first-payment-client.mjs, run node first-payment-client.mjs for quote-only checks, then opt into a buyer-owned x402 payment with PAY_REAL_X402=1. Copy-ready first paid request: curl -fsSL https://x402-wallet.558686.xyz/x402/route/permit-permit2-decoder/first-payment-client.mjs -o first-payment-client.mjs && npm install @x402/fetch @x402/core @x402/evm @x402/svm viem @solana/kit @scure/base && PAY_REAL_X402=1 EVM_PRIVATE_KEY=0x... node first-payment-client.mjs. Generic clients can also discover it from the live 402 response headers: X-First-Payment-Client, X-Download-Install-Then-Pay-Command, and Link rel=payment-client.

Summarize transaction simulation outputs without broadcasting: status, gas, balance deltas, approvals, warnings, and sign-or-stop decision. receipt-gate-policy first: a $0.009 x402 receipt gate route for agent payment enforcement, followed by wallet signing safety, EIP-712, ERC20 allowance, Permit2, transaction simulation, spend guard, and private-key boundary tools. Browsers can inspect the quote, but payment requires a buyer-owned runtime that signs and retries the same request with X-PAYMENT. Buyers can download the route-specific first-payment client at https://x402-wallet.558686.xyz/x402/route/transaction-simulation-summary/first-payment-client.mjs, run node first-payment-client.mjs for quote-only checks, then opt into a buyer-owned x402 payment with PAY_REAL_X402=1. Copy-ready first paid request: curl -fsSL https://x402-wallet.558686.xyz/x402/route/transaction-simulation-summary/first-payment-client.mjs -o first-payment-client.mjs && npm install @x402/fetch @x402/core @x402/evm @x402/svm viem @solana/kit @scure/base && PAY_REAL_X402=1 EVM_PRIVATE_KEY=0x... node first-payment-client.mjs. Generic clients can also discover it from the live 402 response headers: X-First-Payment-Client, X-Download-Install-Then-Pay-Command, and Link rel=payment-client.

Compile spend recurrence guard rules for repeated x402 agent payments. receipt-gate-policy first: a $0.009 x402 receipt gate route for agent payment enforcement, followed by wallet signing safety, EIP-712, ERC20 allowance, Permit2, transaction simulation, spend guard, and private-key boundary tools. Browsers can inspect the quote, but payment requires a buyer-owned runtime that signs and retries the same request with X-PAYMENT. Buyers can download the route-specific first-payment client at https://x402-wallet.558686.xyz/x402/route/x402-agent-spend-recurrence-guard/first-payment-client.mjs, run node first-payment-client.mjs for quote-only checks, then opt into a buyer-owned x402 payment with PAY_REAL_X402=1. Copy-ready first paid request: curl -fsSL https://x402-wallet.558686.xyz/x402/route/x402-agent-spend-recurrence-guard/first-payment-client.mjs -o first-payment-client.mjs && npm install @x402/fetch @x402/core @x402/evm @x402/svm viem @solana/kit @scure/base && PAY_REAL_X402=1 EVM_PRIVATE_KEY=0x... node first-payment-client.mjs. Generic clients can also discover it from the live 402 response headers: X-First-Payment-Client, X-Download-Install-Then-Pay-Command, and Link rel=payment-client.

Detect duplicate x402 transactions, repeated order deliveries, and replay-prone payment records before settlement or entitlement release. Wallet signing safety pack first: $0.018 for buyer-owned controls and enforcement policy, with a free receipt-gate preview plus duplicate-charge, EIP-712, allowance, Permit2, simulation, and spend guards. Start buyer evaluation at https://x402-wallet.558686.xyz/x402/buyer-use-cases or machine JSON https://x402-wallet.558686.xyz/x402/buyer-use-cases.json; checkout contract JSON is https://x402-wallet.558686.xyz/x402/checkout.json. Route payment activation JSON is https://x402-wallet.558686.xyz/x402/route/x402-duplicate-charge-guard/payment-activation.json. Browsers can inspect the quote, but payment requires a buyer-owned runtime that signs and retries the same request with X-PAYMENT. Buyers can download the route-specific first-payment client at https://x402-wallet.558686.xyz/x402/route/x402-duplicate-charge-guard/first-payment-client.mjs, run node first-payment-client.mjs for quote-only checks, then opt into a buyer-owned x402 payment with PAY_REAL_X402=1. Copy-ready first paid request: curl -fsSL https://x402-wallet.558686.xyz/x402/route/x402-duplicate-charge-guard/first-payment-client.mjs -o first-payment-client.mjs && npm install @x402/fetch @x402/core @x402/evm viem && PAY_REAL_X402=1 EVM_PRIVATE_KEY=$EVM_PRIVATE_KEY node first-payment-client.mjs. Generic clients can also discover it from the live 402 response headers: the standard Payment-Required header includes firstPaymentClient, paymentClientUrl, and sameRequestRetryRequired pointers; X-First-Payment-Client, X-Download-Install-Then-Pay-Command, and Link rel=payment-client mirror the same handoff.