the402 endpoint detail

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blockchain-api.x402-chain-tools.workers.dev chain balance

https://blockchain-api.x402-chain-tools.workers.dev/chain/balance

answers 402

Get the native ETH balance of a Base address.

We sent a real POST request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$0.001
Network
base
Pay to
0xa7e1fe3744E3b6D55237d95cE575cAFe3b8abeCD
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
POST
Response latency
440 ms
Payment options
2 usable of 2
Last checked
2026-09-06T01:15:10.712Z (20d ago)
Category
finance-crypto

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fblockchain-api.x402-chain-tools.workers.dev%2Fchain%2Fbalance"