Buffer Latency

{
  "asOf": "2026-10-11T14:38:33.842Z",
  "bufferForTarget": null,
  "bufferSamples": 256,
  "buffers": 2,
  "commonSizes": [
    {
      "bufferSamples": 16,
      "oneBufferMs": 0.333,
      "roundTripMs": 0.667
    },
    {
      "bufferSamples": 32,
      "oneBufferMs": 0.667,
      "roundTripMs": 1.333
    }
  ],
  "converterMs": 0,
  "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.",
  "notChecked": [
    "plug-in and driver latency beyond the figure you supply as converterMs",
    "operating-system mixing and USB or network transport latency",
    "…2 more"
  ],
  "oneBufferMs": 5.333333,
  "reasons": [
    "Round trip = buffers x buffer time + converter latency.",
    "Between 10 and 25 ms: playable, but noticeable on percussive parts."
  ],
  "roundTripMs": 10.666667,
  "sampleRate": 48000,
  "samplesPerMs": 48,
  "source": "latency = buffer samples / sample rate, computed locally",
  "summary": "256 samples at 48000 Hz = 5.333 ms per buffer, 10.667 ms round trip with 2 buffers.",
  "targetMs": null,
  "verdict": "MODERATE"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://audio-calc.x402tookit.com/buffer-latency?bufferSamples=256&sampleRate=48000'

# 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/buffer-latency?bufferSamples=256&sampleRate=48000' \
  | 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%2Fbuffer-latency
const res = await pay("https://audio-calc.x402tookit.com/buffer-latency?bufferSamples=256&sampleRate=48000");
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/buffer-latency?bufferSamples=256&sampleRate=48000")
    print(res.status_code, res.text)