Db Sum

{
  "asOf": "2026-10-11T14:38:34.101Z",
  "averageDb": 66.0206,
  "count": 3,
  "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.",
  "increaseDb": 0.791812,
  "levelsDb": [
    60,
    60
  ],
  "loudestDb": 70,
  "mode": "add",
  "notChecked": [
    "coherent sources (identical signals in phase add 6 dB, not 3 dB, and can cancel)",
    "frequency weighting: A-weighted and unweighted levels must not be mixed",
    "…2 more"
  ],
  "reasons": [
    "Levels are converted to energy, summed, and converted back; the loudest source dominates.",
    "Equal sources add 3 dB per doubling."
  ],
  "source": "Energy summation of incoherent sound levels: L = 10 log10(sum of 10^(Li/10)), computed locally",
  "summary": "Combined level 70.792 dB from 3 sources (loudest 70 dB, +0.792 dB).",
  "totalDb": 70.791812,
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://audio-calc.x402tookit.com/db-sum?levels=60%2C60%2C70'

# 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/db-sum?levels=60%2C60%2C70' \
  | 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%2Fdb-sum
const res = await pay("https://audio-calc.x402tookit.com/db-sum?levels=60%2C60%2C70");
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/db-sum?levels=60%2C60%2C70")
    print(res.status_code, res.text)