Finance Option Price

{
  "result": {
    "answer": "10.45 per call (σ 20%, T 1y)",
    "answerLabel": "Black-Scholes call price",
    "details": [
      {
        "label": "Delta (Δ)",
        "value": "0.6368"
      },
      {
        "label": "Gamma (Γ)",
        "value": "0.018762"
      },
      {
        "label": "Theta (Θ/day)",
        "value": "-0.0176"
      },
      {
        "label": "Vega (per 1% vol)",
        "value": "0.3752"
      },
      {
        "label": "Rho (per 1% rate)",
        "value": "0.5323"
      },
      {
        "label": "Intrinsic value",
        "value": "0"
      },
      {
        "label": "Time value",
        "value": "10.45"
      },
      {
        "label": "Moneyness",
        "value": "S/K = 1.000 — at the money"
      }
    ],
    "steps": [
      "d₁ = (ln(S/K) + (r − q + σ²/2)·T) / (σ√T) = 0.3500, d₂ = d₁ − σ√T = 0.1500",
      "C = S·e^(−qT)·N(d₁) − K·e^(−rT)·N(d₂) = 10.45",
      "Greeks from the same closed form (N = standard normal CDF)"
    ],
    "value": 10.450575
  },
  "tool": "option-price"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://agentstoolshub.com/api/v1/finance/option-price?ratePct=5&spot=100&strike=100&type=call&volPct=20&years=1'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://agentstoolshub.com/api/v1/finance/option-price?ratePct=5&spot=100&strike=100&type=call&volPct=20&years=1' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagentstoolshub.com%2Fapi%2Fv1%2Ffinance%2Foption-price
const res = await pay("https://agentstoolshub.com/api/v1/finance/option-price?ratePct=5&spot=100&strike=100&type=call&volPct=20&years=1");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://agentstoolshub.com/api/v1/finance/option-price?ratePct=5&spot=100&strike=100&type=call&volPct=20&years=1")
    print(res.status_code, res.text)