Gas Estimates API

Multi-Chain-Asche: Gas prices on multiple chains in one call – ETH, Base, Polygon, Arbitrum (BSC). Compare chains to find the cheapest one. 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.

Quick start -- MCP

Add the following to your MCP client configuration (Claude Desktop, Cursor, ElizaOS, etc.):

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

Related MCP server: base-gas-mcp

Quick start -- 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

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

Run in ## Tools

|----------------------|------|------------------|-------|-----------------------------------------------------| |Run | crypto_estimate_ | POST | /api/estimate | $0.005 | Receive gas estimates for multiple EAM chains including their US-Dollar costs |

crypto_estimate_gas

Use this feature when gas prices across multiple EVM chains need to be compared simultaneously. The output provides multi-chain gas estimates in JSON.

Parameter

Results

• chains -- Token list of chain gas data including chain name

• low -- Gas price in Gwei for slow confirmation

• medium -- Gasprice in Gwei for standard confirmation

• high -- Gas price in Gwei for fast confirmation

• transferCostUs -- "Estimated USD costs for a simple transfer on each chain"

• cheapestChain -- which system currently has the lowest gas costs

Antwortbeispiel:

{"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"}

Use this when: Wählen e die cost in a chain the gas? – The feature picks the cheapest chain before a cross-chain transaction. It is essential for Multi-Chain-Agenten, die Gaspreise optimierene.

Use not: Swap exhibition (see dex_get_swap_quote), Bridging (see bridge_find_best_routte).

Example batch prompts

• "Compare gas prices across several AVMetKetten at once"

Payment system

• Protokoll: x402 – HTTP-native, pay-per-call, no with noAPI, no signup

• Network: Base L2 (eip155:18453)

• Asset: USDC

• Facilitator: Coinbase CDP (primär), PayAI (Fallback)

• Also reach via ATXP (OAuth gehaapscht x402, RFC 9728-protected-resource metadata)

As a result of

klymax402 – 100 x402-icropayment-APIs for KI-Agenten, a wallet, USDC on Base, user red.

• Catalog: https://klymax402.com/llms.txt

• Full reference: <https:// klymax402.com/llms-full.txt>

• Actual statistics: https://klymax402.com/statistics

Lizenz