Build npm Package: @near-js/gas-compare - Cross-chain Gas Fee Comparison

Overview

Create an npm package that compares transaction costs across blockchains in real-time, making it easy for developers to show users how much they save on NEAR.

Why This Matters

Gas fees are a major pain point. A simple utility that shows real costs helps developers communicate NEAR's advantage to users.

Technical Requirements

API Design

import { compareGas, getGasPrice, estimateTxCost } from '@near-js/gas-compare';

// Compare current gas prices
const prices = await compareGas();
// {
//   near: { price: "0.0001", unit: "NEAR", usd: "$0.001" },
//   ethereum: { price: "30 gwei", unit: "ETH", usd: "$5.23" },
//   solana: { price: "0.000005", unit: "SOL", usd: "$0.02" },
//   polygon: { price: "100 gwei", unit: "MATIC", usd: "$0.08" }
// }

// Estimate specific transaction costs
const costs = await estimateTxCost({
  type: "token_transfer",
  chains: ["near", "ethereum", "solana"]
});
// Returns estimated cost for a token transfer on each chain

// Get single chain gas price
const nearGas = await getGasPrice("near");

Supported Operations

• Simple transfer
• Token transfer (ERC-20/NEP-141)
• NFT mint
• NFT transfer
• Contract deployment
• Swap (DEX)

Data Sources

• NEAR RPC for NEAR gas
• Etherscan API for Ethereum
• Solana RPC for Solana
• Price feeds for USD conversion

Features

• Real-time price fetching with caching
• Historical gas data (24h, 7d averages)
• Congestion indicators
• TypeScript types included
• Works in Node.js and browser

Deliverables

1. npm package: @near-js/gas-compare
2. Support for 5+ chains
3. Multiple transaction types
4. Documentation with examples
5. Demo website showing live comparison

Budget: 8 NEAR

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