ToolVet
75trust / 100

Gas History

by Saylor Innovations Data Desk in Onchain & crypto

x402 APIPassing, checked 51 min ago

EVM gas fee history - base fee, priority tip percentiles, trend and congestion for a chain over the last N blocks with the USD cost of a transfer

GET
https://saylorinnovations.com/api/gas/history
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
317 ms
323 ms slowest 5%
Last check
Passed
51 min ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

GET https://saylorinnovations.com/api/gas/history

Each call costs $0.01 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://saylorinnovations.com/api/gas/history?blocks=20&chain=ethereum

Parameters

ParameterTypeRequiredDescription
blocksstringNooptional 2-100 recent blocks, default 20
chainstringYesethereum, base, arbitrum, optimism, polygon, bsc, avalanche or linea

Example response

The provider's example. We can't check it without paying.

Example response, 46 lines
{
  "avg_block_utilization_pct": 48.8,
  "base_fee_gwei": {
    "avg": 0.11212,
    "max": 0.11911,
    "min": 0.10264
  },
  "base_fee_trend_pct": 0.6,
  "blocks_sampled": 20,
  "chain": "ethereum",
  "congestion": "low",
  "native_transfer_cost": {
    "gas_units": 21000,
    "native": 0.0000040541,
    "usd": 0.0102
  },
  "next_block_base_fee_gwei": 0.11063,
  "priority_tip_gwei": {
    "p10": 0.00033015,
    "p50": 0.082421,
    "p90": 1.6526
  },
  "series_base_fee_gwei": [
    0.11911,
    0.11304,
    0.112,
    0.11229,
    0.10264,
    0.1138,
    0.11151,
    0.10984,
    0.11145,
    0.11219,
    0.10919,
    0.10763,
    0.10905,
    0.1087,
    0.11742,
    0.11608,
    0.11448,
    0.1151,
    0.1141,
    0.1129
  ],
  "trend": "flat"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://saylorinnovations.com/api/gas/history?blocks=20&chain=ethereum'

# 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://saylorinnovations.com/api/gas/history?blocks=20&chain=ethereum' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Fgas%2Fhistory
const res = await pay("https://saylorinnovations.com/api/gas/history?blocks=20&chain=ethereum");
console.log(res.status, await res.text());
Python: pay and call
# 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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://saylorinnovations.com/api/gas/history?blocks=20&chain=ethereum")
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
51 min agoPassed402317 ms$0.01
6 h agoPassed402323 ms$0.01
10 h agoPassed402279 ms$0.01