Transfer Time

{
  "asOf": "2026-10-11T14:45:32.871Z",
  "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.",
  "duration": "1 min 24 s",
  "effectiveMBps": 11.875,
  "effectiveMbps": 95,
  "effectiveMiBps": 11.32488251,
  "hours": 0.02339181,
  "minutes": 1.403509,
  "notChecked": [
    "latency and TCP slow start, which make short transfers slower than size / rate suggests (see /tcp-throughput)",
    "the real bottleneck: disk, CPU, server limits, Wi-Fi contention or a shared link",
    "…2 more"
  ],
  "overheadPercent": 5,
  "rateMbps": 100,
  "reasons": [
    "Effective rate 95 Mbps = 11.875 MB/s.",
    "Time = size x 8 / effective rate."
  ],
  "seconds": 84.210526,
  "sizeBytes": 1000000000,
  "sizeGB": 1,
  "sizeGiB": 0.93132257,
  "sizeMB": 1000,
  "sizeMiB": 953.674316,
  "source": "time = bits / (rate x efficiency), computed locally",
  "summary": "1 GB at 100 Mbps (5% overhead) takes 1 min 24 s (84.211 s).",
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://network-calc.x402tookit.com/transfer-time?bandwidth=100&overheadPercent=5&rateUnit=Mbps&size=1&sizeUnit=GB'

# 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://network-calc.x402tookit.com/transfer-time?bandwidth=100&overheadPercent=5&rateUnit=Mbps&size=1&sizeUnit=GB' \
  | 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%2Fnetwork-calc.x402tookit.com%2Ftransfer-time
const res = await pay("https://network-calc.x402tookit.com/transfer-time?bandwidth=100&overheadPercent=5&rateUnit=Mbps&size=1&sizeUnit=GB");
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://network-calc.x402tookit.com/transfer-time?bandwidth=100&overheadPercent=5&rateUnit=Mbps&size=1&sizeUnit=GB")
    print(res.status_code, res.text)