Tap Timestamps

{
  "asOf": "2026-10-12T01:46:29.397Z",
  "bpmFromFirstToLastTap": 120,
  "bpmFromMean": 120,
  "bpmFromMedian": 118.812,
  "bpmRounded": 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.",
  "intervalsMs": [
    500,
    510
  ],
  "jitterPercent": 2.828,
  "maxIntervalMs": 510,
  "meanIntervalMs": 500,
  "medianIntervalMs": 505,
  "minIntervalMs": 480,
  "notChecked": [
    "whether the first taps were warm-up taps (drop them if the tempo was still settling)",
    "tempo drift over a long passage (a steady click is not a human performance)",
    "…1 more"
  ],
  "reasons": [
    "Intervals are the gaps between consecutive taps; BPM = 60000 / interval in ms.",
    "The median is steadier than the mean when one tap was badly early or late.",
    "…1 more"
  ],
  "source": "computed locally (intervals between taps; BPM = 60000 / interval; sample standard deviation)",
  "stdevIntervalMs": 14.142,
  "summary": "5 taps give 120 BPM by mean interval (118.81 by median), jitter 2.83%.",
  "tapCount": 5,
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://music-production-calc.x402tookit.com/tap-timestamps?taps=0%2C500%2C1010%2C1490%2C2000'

# 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/tap-timestamps?taps=0%2C500%2C1010%2C1490%2C2000' \
  | 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%2Ftap-timestamps
const res = await pay("https://music-production-calc.x402tookit.com/tap-timestamps?taps=0%2C500%2C1010%2C1490%2C2000");
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/tap-timestamps?taps=0%2C500%2C1010%2C1490%2C2000")
    print(res.status_code, res.text)