the402 endpoint detail

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kette.halowerk.com tx decode

https://kette.halowerk.com/tx/decode

payable

Turns opaque call data into something an agent can reason about before signing. The method signature is resolved from the verified source of the contract first, then from this hub's own list of common signatures, then from the open selector directory — and the answer always names which of the three was used, because a four-byte selector is short enough to collide and colliding entries are listed.

We sent a real POST request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$0.003
Network
base
Pay to
0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
POST
Response latency
511 ms
Payment options
1 usable of 1
Last checked
2026-08-10T09:17:19.948Z (3d ago)
Category
finance-crypto

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fkette.halowerk.com%2Ftx%2Fdecode"