Gas Fee Intelligence Explorer

How it works

Pulls eth_feeHistory (last 100 blocks, 10th/50th/90th percentile tips) and eth_gasPrice from Ethereum, Base, Arbitrum, OP Mainnet, Polygon, Avalanche and BNB Chain, prices the native tokens via DefiLlama and shows what a native transfer, ERC-20 transfer and swap cost on each chain — ranked cheapest first, with OP Stack L1 data fees as an upper bound.

• eth_feeHistory(blockCount, "latest", [10, 50, 90]) per chain: base fee per block (the last entry is the next block's base fee) and the 10th/50th/90th percentile priority fee of each block; the tool takes the median of each percentile across blocks.
• Price tiers = next base fee + median p10 (slow) / p50 (standard) / p90 (fast) tip. Chains without a base fee use eth_gasPrice. Trend compares the average base fee of the newest fifth of blocks with the oldest fifth (±15 %).
• Operation costs use typical gas amounts — native transfer 21,000 (exact), ERC-20 transfer ≈ 65,000, DEX swap ≈ 150,000 (estimates; real usage varies by contract and state) — times the standard tier.
• USD: native token prices from the DefiLlama coins API (coingecko:ethereum, polygon-ecosystem-token, avalanche-2, binancecoin).
• L2 data fees: on Base and OP Mainnet the OP Stack GasPriceOracle (0x4200…000F) getL1FeeUpperBound(size) is added as an upper bound using approximate transaction sizes (50 / 120 / 350 bytes unsigned). Arbitrum's L1 component is not included (it is folded into gas used at execution time and needs a per-transaction estimate).