{
  "markdown": "# Gas Estimator API\n\n[![MCP Server](https://img.shields.io/badge/MCP-server-blue)](https://gas-estimator.api.klymax402.com/mcp)\n[![x402](https://img.shields.io/badge/payments-x402-6E56CF)](https://x402.org)\n[![License: MIT](https://img.shields.io/badge/license-MIT-green)](LICENSE)\n\nMulti-chain gas prices in one call -- ETH, Base, Polygon, Arbitrum, BSC. Compare chains to find cheapest. Pay-per-call via [x402](https://x402.org) (USDC on Base L2) -- no API key, no signup, no rate-limit wall.\n\nPart of the [klymax402](https://klymax402.com) marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.\n\n## Quickstart -- MCP\n\nAdd to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):\n\n```json\n{\n  \"mcpServers\": {\n    \"gas-estimator\": {\n      \"url\": \"https://gas-estimator.api.klymax402.com/mcp\"\n    }\n  }\n}\n```\n\n## Quickstart -- HTTP (x402)\n\n```bash\ncurl -X POST \"https://gas-estimator.api.klymax402.com/api/estimate\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{}'\n# -> 402 Payment Required, with an x402 payment challenge in the response body\n```\n\nAny x402-aware client ([`@x402/fetch`](https://www.npmjs.com/package/@x402/fetch), [`x402-agent-tools`](https://www.npmjs.com/package/x402-agent-tools), ATXP) handles the 402 -> sign -> retry cycle automatically.\n\n## Tools\n\n| Tool | Method | Path | Price | Description |\n|---|---|---|---|---|\n| `crypto_estimate_gas` | POST | `/api/estimate` | $0.005 | Get gas price estimates across multiple EVM chains with USD cost |\n\n### `crypto_estimate_gas`\n\nUse this when you need to compare gas prices across multiple EVM chains at once. Returns multi-chain gas estimates in JSON.\n\n**Parameters**\n\n| Name | Type | Required | Description |\n|---|---|---|---|\n| `chain` | string | no | Chain name: ethereum, base, polygon, arbitrum, bsc. Omit for all chains. |\n\n**Returns**\n\n- `chains` -- array of chain gas data with chain name\n- `low` -- gas price in gwei for slow confirmation\n- `medium` -- gas price in gwei for standard confirmation\n- `high` -- gas price in gwei for fast confirmation\n- `transferCostUsd` -- estimated USD cost for a simple transfer on each chain\n- `cheapestChain` -- which chain currently has the lowest gas cost\n\nExample response:\n\n```json\n{\"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\"}\n```\n\n**When to use**: choosing the cheapest chain before a cross-chain transaction. Essential for multi-chain agents that need to optimize gas costs.\n\n**Not for**: swap quotes (use `dex_get_swap_quote`), bridging (use `bridge_find_best_route`).\n\n## Example agent prompts\n\n- \"Compare gas prices across multiple EVM chains at once\"\n\n## Payment\n\n- Protocol: [x402](https://x402.org) -- HTTP-native pay-per-call, no signup, no API key\n- Network: Base L2 (`eip155:8453`)\n- Asset: USDC\n- Facilitator: Coinbase CDP (primary), PayAI (fallback)\n- Also reachable via [ATXP](https://atxp.ai) (OAuth-wrapped x402, RFC 9728 protected-resource metadata)\n\n## Part of klymax402\n\n100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.\n\n- Catalog: https://klymax402.com/llms.txt\n- Full API reference: https://klymax402.com/llms-full.txt\n- Live stats: https://klymax402.com/stats\n\n## License\n\nMIT\n",
  "bytes": 3344,
  "sha": "435f4b4b26caffd5f6f702b97c2faa99fc7d26abdc1621f73a5e635de8b3b37c",
  "repo_slug": "br0ski777/gas-estimator-x402",
  "fonte": "repo",
  "truncated": false,
  "api": "https://agentalog.com/api/listings/mcp_io_github_br0ski777_gas_estimator_0acb45ab/readme"
}