MIN_PRIORITY_FEE_PER_CHAIN

Documentation for eth_defi.gas.MIN_PRIORITY_FEE_PER_CHAIN data.

MIN_PRIORITY_FEE_PER_CHAIN: dict[int, int] = {1: 1000000000, 137: 30000000000}

Per-chain minimum maxPriorityFeePerGas floors in wei, keyed by chain id.

The eth_maxPriorityFeePerGas RPC suggestion follows recently included transactions and on a quiet Ethereum mainnet can collapse to an effectively zero tip (e.g. 375,524 wei = 0.0004 gwei). Block builders order transactions by effective tip, so a near-zero tip transaction can linger unmined for minutes when the base fee ticks up. This aborted a multichain Lagoon vault deployment on 2026-06-10: a Safe addOwnerWithThreshold() transaction with a 375,524 wei tip took ~3.5 minutes (17 blocks) to confirm, blowing the 120 second receipt timeout.

Floors:

  • Ethereum mainnet (1): 1 gwei. Practically guarantees next-block inclusion, while costing only fractions of a dollar for a typical transaction and a few dollars even for a multi-million gas contract deployment.

  • Polygon (137): 30 gwei, the protocol-enforced spam prevention minimum.

Rollups (Arbitrum, Base, etc.) are deliberately not listed: their sequencers include zero-tip transactions normally, and a flat floor would overpay heavily relative to their tiny base fees.

Override per call with the min_priority_fee argument of estimate_gas_price().