the402 endpoint detail

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derivatives-pricer-production.up.railway.app option price

https://derivatives-pricer-production.up.railway.app/v1/option/price

answers 402

When to use: you already have model inputs (S or forward mark, K, T, r, σ) and need fair value + hedge ratios — not market-premium IV. European BSM price + analytic Greeks (delta, gamma, vega, theta, rho). Works for equity spots and power/commodity forwards (use the maturity mark as spot). USDC exact on Solana/Base. Free fixed sample: GET /v1/demo/option-price.

We sent a real POST request to this endpoint and it answered 402 with payment requirements we could parse.
Price
10000 atomic
Network
solana
Pay to
DCi9X5mmacNGLeJvCw9fdWgX3G8V4QquDn4EuXATkcYr
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
POST
Response latency
391 ms
Payment options
2 usable of 2
Last checked
2026-09-06T01:14:08.228Z (37d ago)
Category
finance-crypto

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fderivatives-pricer-production.up.railway.app%2Fv1%2Foption%2Fprice"