Gas Estimator X402

What is Gas Estimator X402?

Gas Estimator X402 is a multi-chain gas price estimation server that returns live gas prices for Ethereum, Base, Polygon, Arbitrum, and BSC in one call. It uses the x402 pay-per-call protocol (USDC on Base L2) – no API key, no signup, no rate-limit wall. Designed for AI agents and developers needing quick, cross-chain gas cost comparisons.

How to use Gas Estimator X402?

Add the MCP server to your client config (Claude Desktop, Cursor, ElizaOS, etc.) using the URL https://gas-estimator.api.klymax402.com/mcp. Or call the HTTP endpoint directly with a POST to /api/estimate; an x402‑aware client like @x402/fetch handles the payment challenge automatically. The tool crypto_estimate_gas returns multi-chain gas estimates including USD cost.

Key features of Gas Estimator X402

• Multi-chain gas prices in one call (ETH, Base, Polygon, Arbitrum, BSC)
• Pay-per-call via x402 (USDC on Base) – no signup or API key
• Identifies the cheapest chain for transactions
• Returns low/medium/high gas prices in gwei
• Returns estimated USD cost for a simple transfer per chain
• Part of the klymax402 marketplace of 100 x402 micropayment APIs

Use cases of Gas Estimator X402

• Compare gas costs across EVM chains before a cross-chain transaction
• Optimize gas spending for multi-chain AI agents
• Automate chain selection in DeFi workflows
• Monitor live gas prices without rate-limit concerns

FAQ from Gas Estimator X402

What chains are supported by Gas Estimator X402?

Gas Estimator X402 currently supports Ethereum, Base, Polygon, Arbitrum, and BSC. You can query a specific chain or all chains at once.

How does payment work?

Payments use the x402 protocol – an HTTP‑native pay-per-call system. The network is Base L2 (eip155:8453) and the asset is USDC. No API key or upfront signup is required.

Do I need an API key to use Gas Estimator X402?

No. Gas Estimator X402 does not require an API key or signup. Each call is paid via the x402 micropayment challenge.

Are there rate limits?

There are no fixed rate limits. Each request is paid individually (USDC $0.002 per call), so you can make as many calls as your wallet allows.

Can Gas Estimator X402 provide swap quotes or bridge routes?

No. This tool is strictly for gas price estimates. For swap quotes use a dex_get_swap_quote tool; for bridging use a bridge_find_best_route tool.