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Live block height, gas price and fee estimates (transfer, ERC-20 transfer, contract call) for Base or Arc. On Arc fees are quoted directly in USDC.
https://northline-chainkit.northline-c86.workers.dev/v1/network/statusUSDC and native balance of one address on both Base and Arc in a single call.
https://northline-chainkit.northline-c86.workers.dev/v1/usdc/balancesExplain a Base or Arc transaction in plain JSON: status, confirmations, fee, method selector, created contract, and every ERC-20 transfer decoded with symbol and decimals.
https://northline-chainkit.northline-c86.workers.dev/v1/tx/explainVerify that a transaction paid at least N USDC to an address on Base or Arc (handles Arc native-USDC logs). Returns verified true/false, confirmations, matching transfers and reasons. Use it to confirm a customer paid before delivering.
https://northline-chainkit.northline-c86.workers.dev/v1/payment/verifyPreflight any address on Base or Arc before paying or approving it: EOA vs contract vs EIP-7702-delegated wallet, EIP-1967 proxy implementation/admin, owner(), Safe multisig threshold, ERC-20 metadata, USDC + native balance, Sourcify verification, and risk flags.
https://northline-chainkit.northline-c86.workers.dev/v1/address/profile