the402 endpoint detail

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api.24klabs.ai api black-scholes-options-pricer

https://api.24klabs.ai/api/black-scholes-options-pricer

payable

European call/put fair value plus delta, gamma, theta, vega, rho from spot, strike, days-to-expiry, rate and volatility; optional implied-vol solve if market_price supplied.

We sent a real POST request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$0.005
Network
base
Pay to
0xe73D86f185bE79a33b0318d881B71f2a24371114
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
POST
Response latency
86 ms
Payment options
1 usable of 1
Last checked
2026-08-10T09:15:16.857Z (1d ago)
Category
finance-crypto

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.24klabs.ai%2Fapi%2Fblack-scholes-options-pricer"