Cross Chain Balance — x402-gateway

Aggregate native balance and token/NFT counts for an address across eth, arb, base, polygon, opt.

Try it (x402 payment flow)

curl -X POST https://x402.freeq.one/tools/cross_chain_balance \ -H "Content-Type: application/json" \ -d '{"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045", "chains": ["eth", "base", "arb"]}'

Without payment, the server returns 402 Payment Required with x402 challenge details. A paying agent signs a USDC transaction on Base and retries with the payment header.