Gas Estimator API

Provides real-time gas price estimates across Ethereum, Base, Polygon, Arbitrum, and BSC through a single interface. Built on the x402 micropayment protocol, so you pay per query rather than dealing with API keys or subscriptions. The server exposes these estimates via SSE transport at a hosted endpoint, making it straightforward to integrate gas cost calculations into workflows where you need cross-chain fee data. Reach for this when you're building multi-chain tools, need to optimize transaction timing, or want to surface gas costs to users without maintaining your own node infrastructure or juggling multiple chain-specific APIs.