Crypto Gas Trackers: Multi-Chain Fee Monitoring Tools

Gas Tracker Tools Compared

Every blockchain charges transaction fees, but each chain calculates them differently. Ethereum uses gas fees denominated in gwei, Bitcoin charges fee rates in sat/vB, Solana prices compute in lamports, and L2 rollups split costs between execution and data posting. Gas tracker tools monitor these fees in real time, helping users and developers time transactions, set appropriate fee levels, and avoid overpaying during congestion spikes.

The following table compares the most widely used gas tracking tools across supported chains, features, and pricing. Note that Blocknative, once the industry standard for mempool-based gas estimation, ceased API operations in June 2026.

For a direct comparison of current fees across major chains, see our chain fee comparison tool.

How Gas Fees Work on Each Chain

Understanding what a gas tracker is measuring requires understanding how each chain prices transactions. The fee models differ significantly, which is why no single tracker covers every chain well.

Ethereum: EIP-1559 Base Fee + Priority Fee

Since the London hard fork in August 2021, Ethereum uses a two-part fee structure defined by EIP-1559. Each transaction specifies a maxFeePerGas and a maxPriorityFeePerGas. The base fee is set algorithmically per block: it increases up to 12.5% when blocks exceed 50% capacity and decreases by the same amount when they fall below. The base fee is burned (removed from ETH supply), while the priority fee goes to the validator. The actual cost formula is: gas_used × (base_fee + priority_fee), with any difference between the max fee and actual price refunded automatically.

Bitcoin: Sat/vB Fee Rate Auction

Bitcoin uses a pure fee-rate auction measured in satoshis per virtual byte (sat/vB). Total fee equals fee rate multiplied by the transaction's virtual size, which depends on the number of inputs and outputs plus the address type. SegWit addresses (bc1) produce smaller virtual sizes than legacy addresses, reducing fees. Miners sort mempool transactions by fee rate and include the highest-paying ones first. There is no protocol-level fee burning. For real-time Bitcoin fee estimates, see our fee estimator.

Solana: Base Fee + Priority Fee + Compute Units

Solana charges a fixed base fee of 5,000 lamports (0.000005 SOL) per signature. Priority fees are calculated as: ceil(compute_unit_price × compute_unit_limit / 1,000,000) lamports. Each instruction costs a fixed number of compute units (CU), with a maximum of 1,400,000 CU per transaction. A critical detail: priority fees are charged on the requested CU limit, not actual usage, so over-requesting wastes money. Since SIMD-0096, 100% of priority fees go to the block-producing validator.

L2 Rollups: Execution + Data Posting

Layer 2 fees consist of two components: a cheap L2 execution cost (typically under $0.01) and an L1 data posting cost that dominates the total. Rollups batch hundreds of transactions, compress them, and post the data to Ethereum. Since EIP-4844 (March 2024), rollups use dedicated blob space with a separate fee market, so L1 execution spikes no longer affect rollup data costs. This cut L2 fees by 10x to 100x. Typical 2026 L2 fees for a simple transfer run $0.01 to $0.10 on major rollups like Arbitrum, Optimism, and Base.

Tool-by-Tool Breakdown

Etherscan Gas Tracker

Etherscan's Gas Tracker is the most widely used Ethereum gas tool. It displays Low, Average, and High gas price recommendations updated every 15 seconds, along with a gas price heatmap showing hourly and daily patterns. The "Gas Guzzlers" view identifies which contracts consume the most gas, and the estimated transaction cost display shows USD prices for common operations like token swaps and NFT mints. The API provides an eth_gasOracle endpoint for programmatic access and an eth_gasEstimate endpoint that predicts confirmation time for a given gas price. Free tier access was reduced in mid-2026: maximum records per request dropped from 10,000 to 1,000, and chain coverage fell to roughly 90% of supported networks. Pro plans start around $199/month.

Mempool.space

Mempool.space is the standard Bitcoin fee tracker. It provides a real-time visualization of the mempool as stacked blocks color-coded by fee rate, making it immediately clear how congested the network is. Fee rate recommendations are shown for 1-block through 6-block confirmation targets. The platform also includes a Lightning Network explorer, Liquid Network support, mining pool statistics, and a block audit feature that compares expected block contents against what miners actually included. The Mempool Accelerator service, launched in 2024, lets users pay to boost confirmation priority for stuck transactions. The project is fully open source, received approximately $17 million in funding in early 2026, and offers an unrestricted public API.

Owlracle

Owlracle is a multi-chain gas API covering 15+ EVM networks including Ethereum, BSC, Polygon, Arbitrum, Optimism, Base, Fantom, Avalanche, Cronos, Linea, Blast, and Mantle. It provides historical gas price data in candlestick format, a Telegram bot for on-demand gas checks, and browser extensions for Chrome and Edge. Its Proxy Node feature dynamically selects the best RPC endpoint for each request. Owlracle operates on a per-request pricing model funded by crypto deposits through MetaMask, with a limited free tier. It fills a gap for developers who need a single API covering multiple EVM chains now that Blocknative has shut down.

GasHawk: Optimizer, Not Tracker

GasHawk takes a different approach. Rather than displaying gas prices, it optimizes when your transaction is submitted. Users send signed transactions to GasHawk's RPC proxy instead of directly to the network. GasHawk holds them and submits when gas prices are cheapest, using EIP-1559 predictions and historical patterns. The service claims average savings of 30%, with up to 95% during volatile periods. It also routes through Flashbots Protect for MEV protection, preventing sandwich attacks. GasHawk is free to use and non-custodial: it only receives already-signed transactions. The main limitation is that it only supports Ethereum mainnet.

Solana Fee Tracking Tools

Solana's fee landscape is less mature than Ethereum's in terms of dedicated tracking tools, but several options exist:

• Triton Priority Fee Tracker (triton.one): free, open source, shows real-time priority fee estimates by percentile (50th, 75th, 90th)
• QuickNode Solana Gas Tracker: free resource for monitoring current Solana mainnet fee prices and cost estimates
• Helius Priority Fee API: smart fee estimation with six priority levels and real-time analysis, available through Helius's paid API tiers
• Native RPC: the getRecentPrioritizationFees method queries a cache of the last 150 blocks for fee data

Solana's base transaction fee remains under a cent in most conditions, so fee tracking matters less for simple transfers than it does on Ethereum. Priority fees become important during network congestion or when competing for inclusion in high-demand scenarios like token launches.

API Pricing and Rate Limits

Developers integrating gas data into applications need to evaluate API reliability, rate limits, and cost. The following table summarizes pricing for the major gas tracker APIs.

For Bitcoin-specific fee estimation approaches, our fee estimation algorithm comparison covers the technical differences between mempool-based and confirmation-target-based estimators.

Reading Gas Data: A Practical Guide

Gas tracker dashboards show different metrics depending on the chain. Here is how to interpret the key numbers:

Ethereum gas trackers:

• Base fee (gwei): the minimum price per gas unit, set by the protocol. A base fee of 1 gwei means a simple ETH transfer (21,000 gas) costs about 0.000021 ETH
• Priority fee (gwei): the tip you add for faster inclusion. During low congestion, 0.1 gwei is often sufficient
• Low / Standard / Fast tiers: estimated total gas prices for different confirmation speed targets
• Gas heatmaps: show hourly patterns where weekends and early UTC mornings tend to have the cheapest gas

Bitcoin fee trackers:

• Fee rate (sat/vB): the cost per virtual byte. A typical SegWit transaction is roughly 140 vB, so a 2 sat/vB fee rate costs about 280 sats total
• Block target: how many blocks until expected confirmation. 1-block targets require the highest fee rate
• Mempool depth: the total size of unconfirmed transactions. A deep mempool means higher fees for fast confirmation

L2 fee trackers:

• L2 execution fee: the cost of running your transaction on the rollup. Usually negligible (under $0.01)
• L1 data fee: the cost of posting your transaction data to Ethereum. This is typically the majority of the total fee
• Total fee: the sum of both. Compare across L2s using our chain fee comparison

Choosing the Right Gas Tracker

The best gas tracker depends on which chains you use and whether you need programmatic access:

For Ethereum-only users: Etherscan Gas Tracker provides the most comprehensive dashboard with heatmaps, historical data, and gas guzzler rankings. GasHawk is worth adding as a complementary tool if you want automated fee optimization on non-urgent transactions.

For Bitcoin users: mempool.space is the clear standard. Its mempool visualization provides an intuitive understanding of current fee conditions, and the open-source API requires no authentication. Blockstream's Esplora API is a solid alternative with 30+ endpoints and no rate limits.

For multi-chain EVM developers: Owlracle offers the broadest EVM chain coverage through a single API, covering 15+ networks. Etherscan's cross-chain API key supports more chains but the gas tracker module is not available on all of them.

For L2 fee comparison: L2Fees.info provides the quickest at-a-glance comparison of current fees across 11 Layer 2 networks. L2BEAT offers deeper analytics on operating costs for 73+ rollups, useful for developers evaluating which L2 to deploy on.

For Solana: Triton's Priority Fee Tracker and Helius's API are the primary options. Most Solana wallets handle fee estimation automatically, so standalone trackers are less necessary unless you are building applications that need fine-grained fee control.

On Bitcoin's Layer 2 networks, fee dynamics work differently. Protocols like Spark enable near-instant transfers with minimal fees, sidestepping the mainnet fee auction entirely. For a deeper comparison of Bitcoin L2 fee structures, see our Bitcoin L2 fee comparison.

Frequently Asked Questions

What is the best free gas tracker for Ethereum?

Etherscan's Gas Tracker is the most feature-rich free option for Ethereum, offering real-time estimates, historical heatmaps, and gas guzzler rankings. Beaconcha.in's GasNow provides a simpler alternative with a GasNow-compatible API. For developers who need programmatic access without rate limits, running a local node and querying eth_gasPrice or eth_feeHistory RPC methods is the most reliable approach.

Why did Blocknative shut down?

Blocknative ceased API operations on June 19, 2026, with its team being absorbed by Deloitte. Blocknative was known for its mempool-based gas estimation that provided confidence-level predictions (e.g., 99% confidence of inclusion in the next 5 blocks). Developers who relied on Blocknative's API can evaluate LogicNodes as a drop-in replacement, or switch to Etherscan's Gas Oracle or Owlracle for multi-chain coverage.

How do I check Bitcoin transaction fees in real time?

Mempool.space is the standard tool for real-time Bitcoin fee estimation. It visualizes the mempool as stacked blocks sorted by fee rate, showing recommended sat/vB rates for different confirmation targets (next block through 6 blocks). Blockstream.info provides similar fee recommendations through its Esplora API. Both are free and require no authentication. For a step-by-step guide, see our Bitcoin fee market dynamics research article.

What is the cheapest time to send an Ethereum transaction?

Ethereum gas prices follow predictable daily and weekly patterns. Historically, the cheapest periods are weekends (Saturday and Sunday UTC) and early UTC mornings (roughly 02:00 to 08:00 UTC), when US and European users are least active. Etherscan's gas heatmap visualizes these patterns. In 2026, Ethereum mainnet gas has been at historic lows (0.15 to 0.5 gwei base fee) because most activity has migrated to L2 rollups, making timing less critical than in previous years.

How do Layer 2 fees compare to Ethereum mainnet?

L2 fees are typically 10x to 100x cheaper than Ethereum mainnet. A simple ETH transfer on Arbitrum, Optimism, or Base costs roughly $0.01 to $0.10, compared to $0.50 or more on mainnet during moderate congestion. The difference grew even larger after EIP-4844 introduced dedicated blob space for rollup data in March 2024. L2Fees.info tracks these costs in real time across 11 Layer 2 networks. For a broader comparison, see our EIP-4844 blob fee market analysis.

Do gas trackers work for Solana?

Dedicated Solana gas trackers exist but are less common because Solana's base fee (0.000005 SOL per signature) is fixed and negligible. The variable cost comes from priority fees, which matter during congestion or competitive scenarios. Triton's Priority Fee Tracker, QuickNode's Solana Gas Tracker, and Helius's Priority Fee API all provide real-time priority fee data. Developers can also query the native getRecentPrioritizationFees RPC method directly from any Solana node.

Can I get gas price alerts on my phone?

Several tools offer alert mechanisms. Etherscan provides notification features through its platform. Owlracle offers a Telegram bot that responds to /gas commands with current prices across multiple chains. The GasNow browser extension shows real-time gas prices for 8+ blockchains in the browser toolbar. For automated workflows, developers can poll any gas tracker API and route notifications through services like Telegram bots or webhook integrations.

This tool is for informational purposes only and does not constitute financial advice. Gas prices, API pricing, and tool availability change frequently. Blocknative's shutdown in June 2026 demonstrates that even established tools can discontinue service. Always verify current tool status and pricing before integrating into production systems.