Ethernet Efficiency

{
  "asOf": "2026-10-11T14:45:31.046Z",
  "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.",
  "frameBytes": 1518,
  "goodputEfficiencyPercent": 94.1482,
  "goodputMBps": 117.6853,
  "goodputMbps": 941.4824,
  "ipPacketBytes": 1500,
  "l3EfficiencyPercent": 97.5293,
  "l3ThroughputMbps": 975.2926,
  "linkMbps": 1000,
  "minimumFramePadding": 0,
  "nanosecondsPerPacket": 12304,
  "notChecked": [
    "TCP acknowledgements and retransmissions, which consume reverse-path and forward-path capacity",
    "real devices that cannot forward minimum-size packets at line rate",
    "…3 more"
  ],
  "overheadBytesPerPacket": 90,
  "packetsPerSecond": 81274.38,
  "payloadBytes": 1448,
  "protocol": "tcp4",
  "protocolHeaderBytes": 52,
  "reasons": [
    "Wire bytes = 1500 IP + 18 Ethernet (header, FCS) + 8 preamble + 12 interframe gap.",
    "Goodput counts only transport payload bytes (the data inside TCP or UDP)."
  ],
  "source": "IEEE 802.3 framing: preamble and start delimiter 8, header 14, FCS 4, interframe gap 12 bytes, 64-byte minimum frame, computed locally",
  "summary": "1500-byte IP packets (TCP over IPv4 (20 + 20)) use 1538 bytes on the wire; 94.15% efficiency gives 941.48 Mbps of goodput on a 1000 Mbps link; 81274 packets per second.",
  "verdict": "COMPUTED",
  "wireBytes": 1538
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://network-calc.x402tookit.com/ethernet-efficiency?ipPacketBytes=1500&linkMbps=1000&protocol=tcp4&tcpTimestamps=true'

# 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/ethernet-efficiency?ipPacketBytes=1500&linkMbps=1000&protocol=tcp4&tcpTimestamps=true' \
  | 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%2Fethernet-efficiency
const res = await pay("https://network-calc.x402tookit.com/ethernet-efficiency?ipPacketBytes=1500&linkMbps=1000&protocol=tcp4&tcpTimestamps=true");
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/ethernet-efficiency?ipPacketBytes=1500&linkMbps=1000&protocol=tcp4&tcpTimestamps=true")
    print(res.status_code, res.text)