Dbfs

{
  "amplitude": 0.501187234,
  "asOf": "2026-10-11T14:38:34.362Z",
  "crestFactor": 1.414214,
  "crestFactorDb": 3.0103,
  "dbfs": -6,
  "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.",
  "headroomDb": 6,
  "notChecked": [
    "inter-sample (true) peaks, which can exceed the sample peaks by a dB or more",
    "filtered or real-world signals, whose crest factor differs from the ideal shapes",
    "…2 more"
  ],
  "percentOfFullScale": 50.118723,
  "reasons": [
    "6 dB of headroom below full scale.",
    "Crest factor = peak / RMS: sine 1.414 (3.01 dB), square 1 (0 dB), triangle and sawtooth 1.732 (4.77 dB)."
  ],
  "rmsAmplitude": 0.354392892,
  "rmsDbfs": -9.0103,
  "shape": "sine",
  "sixteenBitCode": 16422,
  "source": "Decibel definition 20 log10(amplitude ratio) and standard waveform RMS values, computed locally",
  "summary": "Peak 0.501187 (-6 dBFS); a sine wave at that peak has RMS 0.354393 (-9.01 dBFS) and a crest factor of 3.01 dB.",
  "twentyFourBitCode": 4204263,
  "verdict": "BELOW_FULL_SCALE"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://audio-calc.x402tookit.com/dbfs?dbfs=-6&shape=sine'

# 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://audio-calc.x402tookit.com/dbfs?dbfs=-6&shape=sine' \
  | 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%2Faudio-calc.x402tookit.com%2Fdbfs
const res = await pay("https://audio-calc.x402tookit.com/dbfs?dbfs=-6&shape=sine");
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://audio-calc.x402tookit.com/dbfs?dbfs=-6&shape=sine")
    print(res.status_code, res.text)