the402 endpoint detail

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markt.halowerk.com slippage

https://markt.halowerk.com/slippage

payable

Takes side, size and size_unit and simulates the fill against the visible book of Binance, Coinbase, Kraken, OKX or Bybit. avg_price is the size weighted fill price, worst_price the last level touched, slippage is stated against the mid and against the best price on the executing side, with the reference named. If the visible depth is not enough the answer is still valid and paid: insufficient_liq

We sent a real POST request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$0.004
Network
base
Pay to
0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
POST
Response latency
553 ms
Payment options
1 usable of 1
Last checked
2026-08-10T09:17:21.099Z (4d ago)
Category
finance-crypto

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