Shutter Angle

{
  "angleDegrees": 180,
  "asOf": "2026-10-12T00:51:08.219Z",
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "flickerSafe50Hz": {
    "angleNearest": 172.8,
    "hz": 50,
    "shutterDenominatorNearest": 50,
    "shutterSecondsNearest": 0.02
  },
  "flickerSafe60Hz": {
    "angleNearest": 216,
    "hz": 60,
    "shutterDenominatorNearest": 40,
    "shutterSecondsNearest": 0.025
  },
  "fps": "24",
  "frameDurationMs": 41.6667,
  "notChecked": [
    "electronic-shutter and rolling-shutter artifacts",
    "the camera's real available shutter steps",
    "…1 more"
  ],
  "reasons": [
    "180 degrees is the classic cinema look: exposure of half the frame time."
  ],
  "shutterDenominator": 48,
  "shutterMilliseconds": 20.8333,
  "shutterSeconds": 0.020833,
  "source": "computed locally (angle / 360 / fps)",
  "summary": "At 24 fps, 180 degrees = 1/48 s (20.833 ms).",
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://video-calc.x402tookit.com/shutter-angle?angle=180&fps=24'

# 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://video-calc.x402tookit.com/shutter-angle?angle=180&fps=24' \
  | 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fvideo-calc.x402tookit.com%2Fshutter-angle
const res = await pay("https://video-calc.x402tookit.com/shutter-angle?angle=180&fps=24");
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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://video-calc.x402tookit.com/shutter-angle?angle=180&fps=24")
    print(res.status_code, res.text)