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EVM Multi-Chain Gas Price API
x402
EVM Multi-Chain Gas Price API is a paid API for AI agents from api.x-402.online, paid per call via x402, $0.003/call, status down (last checked 2026-09-15).
Returns live gas prices in gwei for up to 7 EVM-compatible chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BSC, Avalanche) in a single call, with optional filtering by chain.
Price / call$0.003
Success—
StatusDown
Output
Returns current gas prices in gwei for the requested chain(s). When no chain filter is provided, the response includes gas data for all 7 supported EVM networks (Ethereum, Base, Arbitrum, Optimism, Polygon, BSC, Avalanche). When filtered with ?chain=<name>, returns gas data for that single chain only.
Example use cases
Pre-transaction gas check
“Before I send this ETH transfer, what's the current gas price on Ethereum mainnet in gwei?”
Cheapest chain routing for DeFi
“I want to make a DeFi swap — which of these chains has the lowest gas fees right now: Arbitrum, Optimism, Polygon, or Base?”
Multi-chain gas dashboard
“Give me a snapshot of live gas prices across all 7 EVM chains — Ethereum, Base, Arbitrum, Optimism, Polygon, BSC, and Avalanche — so I can decide where to deploy my contract.”
Technical details
Endpoint
POSThttps://api.x-402.online/v1/crypto/gasWhen to prefer
Choose this endpoint when you need real-time gas prices across multiple EVM chains simultaneously in a single API call, or when you want to compare fees across networks to route a transaction optimally. It covers 7 major EVM chains in one request, making it more efficient than querying each chain's RPC individually. Prefer this over block explorer APIs when you need a unified multi-chain view without managing multiple integrations.
Side effects
- Unsupported chain name in query parameter returns an error or empty result
- Temporary RPC node unavailability may return stale or missing gas data for a specific chain
- Network congestion spikes may cause brief latency in data freshness
- Malformed query parameter (e.g. typo in chain name) returns no matching chain data
Tags
x402
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