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Gas Estimator API

br0ski777/gas-estimator-x402

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.

tool
1
transport
SSE
last updated
May 16, 2026
View on GitHub

Tools

1 tools

Public tool metadata for what this MCP can expose to an agent.

crypto_estimate_gasUse this when you need to compare gas prices across multiple EVM chains at once. Returns multi-chain gas estimates in JSON. 1. chains: array of chain gas data with chain name 2. low: gas price in gwe1 params

Use this when you need to compare gas prices across multiple EVM chains at once. Returns multi-chain gas estimates in JSON. 1. chains: array of chain gas data with chain name 2. low: gas price in gwe

Parameters* required
chainstring
Chain name: ethereum, base, polygon, arbitrum, bsc. Omit for all chains.

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Readme

Gas Estimator API

MCP Server x402 License: MIT

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.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "gas-estimator": {
      "url": "https://gas-estimator.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://gas-estimator.api.klymax402.com/api/estimate" \
  -H "Content-Type: application/json" \
  -d '{}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

View the full README on GitHub

Details

Repository
github.com/br0ski777/gas-estimator-x402
Website
github.com/Br0ski777/gas-estimator-x402
Transport
SSE
Registry
MCP registry, active

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