the402 endpoint detail

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open-pay.jp jpyc balance

https://open-pay.jp/api/paid/usdc/jpyc/balance

answers 402

Read the current on-chain JPYC balance of any EVM address on one or all supported chains (Polygon, Kaia, Avalanche, Ethereum), with the token contract and the block number observed at request time. Use before or after a payment, for treasury checks, wallet monitoring, and payment reconciliation. The result does not prove wallet ownership and is not a transaction-finality certificate.

We sent a real GET request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$0.002
Network
base
Pay to
0x52d4901142e2B5680027da5EB47C86CB02a3cA81
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
GET
Response latency
173 ms
Payment options
1 usable of 1
Last checked
2026-09-06T01:13:18.677Z (21d ago)
Category
finance-crypto

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fopen-pay.jp%2Fapi%2Fpaid%2Fusdc%2Fjpyc%2Fbalance"