Gas

compareGas

Returns current base fee and priority fee for every EVM chain with estimated USD cost for a simple transfer (hardcoded at 21,000 gas). Sorted cheapest first. Uses live native token prices. Actual tx costs vary by type - token transfers, swaps, etc. use significantly more gas.

curl -X POST https://your-endpoint.simplystaking.xyz/v1 \
  -H "Content-Type: application/json" \
  -d '{
  "jsonrpc": "2.0",
  "method": "compareGas",
  "params": {},
  "id": 1
}'

import { Spectrum } from '@spectrumnodes/sdk';

const spectrum = new Spectrum({ api: 'https://your-endpoint.simplystaking.xyz/YOUR_API_KEY/' });

const result = await spectrum.core.getGasComparison();
console.log(result);

{
  "jsonrpc": "2.0",
  "result": {
    "data": {
      "results": [
        {
          "chain": "optimism",
          "baseFeeGwei": 0.0000143,
          "priorityFeeGwei": 0.001,
          "estimatedTxCostUsd": 0
        },
        {
          "chain": "arbitrum",
          "baseFeeGwei": 0.02,
          "priorityFeeGwei": 0,
          "estimatedTxCostUsd": 0
        },
        {
          "chain": "ethereum",
          "baseFeeGwei": 0.546,
          "priorityFeeGwei": 0.133,
          "estimatedTxCostUsd": 0.03
        }
      ],
      "updatedAt": "2026-02-25T15:00:00.000Z"
    }
  },
  "id": 1
}

curl -X POST https://your-endpoint.simplystaking.xyz/v1 \
  -H "Content-Type: application/json" \

{
  "jsonrpc": "2.0",
  "method": "compareGas",
  "params": {},
  "id": 1
}

Response Fields

Field	Type
`data`	object
`results`	object[]
`chain`	string
`baseFeeGwei`	number
`priorityFeeGwei`	number
`estimatedTxCostUsd`	integer
`updatedAt`	string

Try It

Base URL

JSON-RPC Body

{
  "jsonrpc": "2.0",
  "method": "compareGas",
  "params": {},
  "id": 1
}

estimateGas

Estimates the gas required for a transaction without actually sending it. Useful for determining gas limits before submitting transactions.

curl -X POST https://your-endpoint.simplystaking.xyz/v1 \
  -H "Content-Type: application/json" \
  -d '{
  "jsonrpc": "2.0",
  "method": "estimateGas",
  "params": {
    "chain": "ethereum",
    "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
  },
  "id": 1
}'

import { Spectrum } from '@spectrumnodes/sdk';

const spectrum = new Spectrum({ api: 'https://your-endpoint.simplystaking.xyz/YOUR_API_KEY/' });

const result = await spectrum.core.estimateGas('ethereum', { to: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48' });
console.log(result);

{
  "jsonrpc": "2.0",
  "result": {
    "data": {
      "chain": "ethereum",
      "gasEstimate": 21000,
      "gasEstimateHex": "0x5208"
    }
  },
  "id": 1
}

curl -X POST https://your-endpoint.simplystaking.xyz/v1 \
  -H "Content-Type: application/json" \

{
  "jsonrpc": "2.0",
  "method": "estimateGas",
  "params": {
    "chain": "ethereum",
    "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
  },
  "id": 1
}

Parameters

Name	Required	Description
chain	yes	Network slug
to	yes	Destination address e.g. 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
from	no	Sender address e.g. 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
value	no	ETH value in hex wei (e.g. 0xde0b6b3a7640000 = 1 ETH)
data	no	Contract call data (hex encoded)

Response Fields

Field	Type
`data`	object
`chain`	string
`gasEstimate`	integer
`gasEstimateHex`	string

Supported Networks

EthereumPolygonBNB ChainOptimismBaseAvalancheArbitrumGnosisMoonbeamLineaHyperliquidBerachainMonadScrollPlasmaX Layer

Try It

Base URL

Chain

to *

from

value

data

JSON-RPC Body

{
  "jsonrpc": "2.0",
  "method": "estimateGas",
  "params": {
    "chain": "ethereum",
    "to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
  },
  "id": 1
}