Multi-chain gas prices in one call -- ETH, Base, Polygon, Arbitrum, BSC. Compare chains to find cheapest. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Gas Estimator X402 is an MCP project maintained in the br0ski777/gas-estimator-x402 repository. The maintainer describes its purpose as “Multi-chain gas prices in one call -- ETH, Base, Polygon, Arbitrum, BSC. Compare chains to find cheapest. Pay-per-call via x402 (USDC on Base L2) --…”. Read the project documentation for the complete scope.
The maintainer’s configuration uses https://gas-estimator.api.klymax402.com/mcp. Check the project’s account and authentication instructions when adding the endpoint to your client.
Project documentation · Repository · Discovery listing. This profile records the public documentation checked on 2026-10-08.
Check the linked publisher documentation and your connected client's tool list. Names and availability can vary with the server version and account permissions.
| Tool | What it does |
|---|---|
| chains | - array of chain gas data with chain name |
| low | - gas price in gwei for slow confirmation |
| medium | - gas price in gwei for standard confirmation |
| high | - gas price in gwei for fast confirmation |
| transferCostUsd | - estimated USD cost for a simple transfer on each chain |
| cheapestChain | - which chain currently has the lowest gas cost |
| crypto_estimate_gas | |
| chain | string |
{
"mcpServers": {
"gas-estimator": {
"url": "https://gas-estimator.api.klymax402.com/mcp"
}
}
}From the project documentation. Replace placeholders and example paths before connecting.
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