the402 endpoint detail

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app.heinrichstech.com cdp wallet-doctor

https://app.heinrichstech.com/v1/cdp/wallet-doctor

payable, partial

BitBooth Wallet Doctor: pay 0.005 USDC, hand in an EVM wallet, get back a pre-flight hygiene diagnosis on Base mainnet — native ETH balance for gas, USDC balance for payments, plus derived flags (lowGas, usdcDust, usdcEmpty, ready) and a recommendations list. The wallet pre-flight every agent should run BEFORE kicking off a flow.

We sent a real POST request to this endpoint and it answered 402 with payment requirements we could parse. It advertises 8 ways to pay and only 6 of them are usable.
Price
$0.005
Network
base
Pay to
0xDa2F35d283c42dd60B965322394bc658a5c1769F
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
POST
Response latency
72 ms
Payment options
6 usable of 8
Last checked
2026-08-10T09:14:14.096Z (1d ago)
Category
finance-crypto

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapp.heinrichstech.com%2Fv1%2Fcdp%2Fwallet-doctor"