Tempo Grid

{
  "asOf": "2026-10-12T01:46:29.660Z",
  "barMs4over4": 2000,
  "bpm": 120,
  "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.",
  "grid": [
    {
      "dotted": {
        "hz": 0.3333,
        "ms": 3000,
        "samples": 132300,
        "ticks": 2880,
        "ticksAreWhole": true
      },
      "note": "1/1",
      "straight": {
        "hz": 0.5,
        "ms": 2000,
        "samples": 88200,
        "ticks": 1920,
        "ticksAreWhole": true
      },
      "triplet": {
        "hz": 0.75,
        "ms": 1333.333,
        "samples": 58800,
        "ticks": 1280,
        "ticksAreWhole": true
      }
    },
    {
      "dotted": {
        "hz": 0.6667,
        "ms": 1500,
        "samples": 66150,
        "ticks": 1440,
        "ticksAreWhole": true
      },
      "note": "1/2",
      "straight": {
        "hz": 1,
        "ms": 1000,
        "samples": 44100,
        "ticks": 960,
        "ticksAreWhole": true
      },
      "triplet": {
        "hz": 1.5,
        "ms": 666.667,
        "samples": 29400,
        "ticks": 640,
        "ticksAreWhole": true
      }
    }
  ],
  "midiClockPulseMs": 20.8333,
  "midiClockPulsesPerQuarter": 24,
  "notChecked": [
    "how your plugin or DAW rounds delay times (some round to whole ms or whole samples)",
    "swing and groove templates, which move notes off this grid",
    "…1 more"
  ],
  "quarterNoteMs": 500,
  "reasons": [
    "Quarter = 60000 / BPM ms. Other values scale from it: dotted is 1.5 times, triplet is 2/3 times the straight value.",
    "Hz is the LFO or modulation rate that repeats once per note value (1000 / ms)."
  ],
  "sampleRateUsed": 44100,
  "samplesPerBeat": 22050,
  "source": "computed locally (quarter note = 60000 / BPM ms; whole = 4 quarters; dotted x 1.5; triplet x 2/3)",
  "summary": "At 120 BPM a quarter note is 500 ms (22050 samples at 44100 Hz, 480 ticks).",
  "ticksPerQuarter": 480,
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://music-production-calc.x402tookit.com/tempo-grid?bpm=120&ppq=480&sampleRate=44100'

# 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://music-production-calc.x402tookit.com/tempo-grid?bpm=120&ppq=480&sampleRate=44100' \
  | 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%2Fmusic-production-calc.x402tookit.com%2Ftempo-grid
const res = await pay("https://music-production-calc.x402tookit.com/tempo-grid?bpm=120&ppq=480&sampleRate=44100");
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://music-production-calc.x402tookit.com/tempo-grid?bpm=120&ppq=480&sampleRate=44100")
    print(res.status_code, res.text)