Gas Estimator API

Multi-chain gas estimation — ETH, Base, Polygon, Arbitrum, BSC. x402 micropayment.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Remote HTTP

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

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

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Capabilities & Tool Schemas (2)Self-reported

Inspect callable tools, capabilities, and parameters exposed to AI agents by Gas Estimator API.

crypto_estimate_gas

Get gas price estimates across multiple EVM chains with USD cost

chain

Chain name: ethereum, base, polygon, arbitrum, bsc. Omit for all chains.

Documentation Overview

Gas Estimator API

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.):

config.json

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

Quickstart -- HTTP (x402)

Terminal

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

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
`crypto_estimate_gas`	POST	`/api/estimate`	$0.005	Get gas price estimates across multiple EVM chains with USD cost

`crypto_estimate_gas`

Use this when you need to compare gas prices across multiple EVM chains at once. Returns multi-chain gas estimates in JSON.

Parameters

Name	Type	Required	Description
`chain`	string	no	Chain name: ethereum, base, polygon, arbitrum, bsc. Omit for all chains.

Returns

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

Example response:

config.json

{"chains":[{"chain":"base","low":0.005,"medium":0.008,"high":0.012,"transferCostUsd":0.01},{"chain":"ethereum","low":12.5,"medium":18.0,"high":25.0,"transferCostUsd":0.85}],"cheapestChain":"base"}

When to use: choosing the cheapest chain before a cross-chain transaction. Essential for multi-chain agents that need to optimize gas costs.

Not for: swap quotes (use dex_get_swap_quote), bridging (use bridge_find_best_route).

Example agent prompts

"Compare gas prices across multiple EVM chains at once"

Payment

Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
Network: Base L2 (eip155:8453)
Asset: USDC
Facilitator: Coinbase CDP (primary), PayAI (fallback)
Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

Catalog: https://klymax402.com/llms.txt
Full API reference: https://klymax402.com/llms-full.txt
Live stats: https://klymax402.com/stats

License

MIT

Read the full README →View source on GitHub →

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Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

Last commit

22d ago

Most recent push to the default branch.

Tools exposed

Callable tools this server registers over MCP.

Directory activity

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Frequently Asked Questions about Gas Estimator API

Gas Estimator API is a hosted MCP server. Add it as a remote server in your client's config: "mcpServers": { "gas-estimator-api": { "url": "https://gas-estimator.api.klymax402.com/mcp" } }

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Technical Specs & Signals

CategoryFinance & Fintech

10/14 checks healthy over the last 45d

51Quality signal: Good · 51/100How this signal is calculated ▾

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More in 💰 Finance & Fintech →Best MCP servers for Finance & Fintech →Alternatives to Gas Estimator API →Install in Claude Desktop Install in Cursor Install in VS Code Setup guides for all 13 MCP clients

Documentation Overview

Gas Estimator API

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.):

config.json

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

Quickstart -- HTTP (x402)

Terminal

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

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
`crypto_estimate_gas`	POST	`/api/estimate`	$0.005	Get gas price estimates across multiple EVM chains with USD cost

`crypto_estimate_gas`

Use this when you need to compare gas prices across multiple EVM chains at once. Returns multi-chain gas estimates in JSON.

Parameters

Name	Type	Required	Description
`chain`	string	no	Chain name: ethereum, base, polygon, arbitrum, bsc. Omit for all chains.

Returns

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

Example response:

config.json

{"chains":[{"chain":"base","low":0.005,"medium":0.008,"high":0.012,"transferCostUsd":0.01},{"chain":"ethereum","low":12.5,"medium":18.0,"high":25.0,"transferCostUsd":0.85}],"cheapestChain":"base"}

When to use: choosing the cheapest chain before a cross-chain transaction. Essential for multi-chain agents that need to optimize gas costs.

Not for: swap quotes (use dex_get_swap_quote), bridging (use bridge_find_best_route).

Example agent prompts

"Compare gas prices across multiple EVM chains at once"

Payment

Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
Network: Base L2 (eip155:8453)
Asset: USDC
Facilitator: Coinbase CDP (primary), PayAI (fallback)
Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

Catalog: https://klymax402.com/llms.txt
Full API reference: https://klymax402.com/llms-full.txt
Live stats: https://klymax402.com/stats

License

MIT

Frequently Asked Questions about Gas Estimator API

Gas Estimator API is a hosted MCP server. Add it as a remote server in your client's config: "mcpServers": { "gas-estimator-api": { "url": "https://gas-estimator.api.klymax402.com/mcp" } }