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Gas Oracle API

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Real-time gas prices, gwei tiers, USD cost estimates for Base and Ethereum. x402.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (sse)
Claude Code 
claude mcp add --transport sse gas-oracle-api 'https://gas-oracle.api.klymax402.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "gas-oracle-api": {
            "type": "sse",
            "url": "https://gas-oracle.api.klymax402.com/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Gas Oracle API
  2. Quickstart -- MCP
  3. Quickstart -- HTTP (x402)
  4. Tools
  5. Example agent prompts
  6. Payment
  7. Part of klymax402
  8. License

Gas Oracle API

Live gas prices with gwei tiers, USD cost estimates, and congestion level. Time your transactions perfectly. 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-oracle": {
      "url": "https://gas-oracle.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl "https://gas-oracle.api.klymax402.com/api/price"
# -> 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

ToolMethodPathPriceDescription
gas_get_current_priceGET/api/price$0.003Get current gas prices with slow/standard/fast/instant tiers
gas_get_current_pricePOST/api/price$0.003Get current gas prices with slow/standard/fast/instant tiers (POST variant)
gas_get_current_price

Use this when you need current gas prices before submitting a transaction. Returns gas tiers and USD cost estimates in JSON.

Parameters

NameTypeRequiredDescription
chainstringnoBlockchain network (default: base)

Returns

  • slow -- gas price in gwei for slow confirmation (~5 min)
  • standard -- gas price in gwei for standard confirmation (~2 min)
  • fast -- gas price in gwei for fast confirmation (~30s)
  • instant -- gas price in gwei for instant confirmation
  • transferCostUsd -- estimated USD cost for a simple ETH transfer
  • swapCostUsd -- estimated USD cost for a token swap
  • congestion -- network congestion level (low/medium/high)

Example response:

{"slow":0.008,"standard":0.012,"fast":0.018,"instant":0.025,"transferCostUsd":0.02,"swapCostUsd":0.05,"congestion":"low","chain":"base"}

When to use: submitting any on-chain transaction to pick the right gas tier. Essential for timing transactions and avoiding high-gas periods.

Not for: swap quotes (use dex_get_swap_quote), wallet balance (use wallet_get_portfolio).

gas_get_current_price

Use this when you need current gas prices before submitting a transaction. Returns gas tiers and USD cost estimates in JSON. POST variant of gas_get_current_price -- same params passed as JSON body instead of query string.

Parameters

NameTypeRequiredDescription
chainstringnoBlockchain network (default: base)

Returns

  • slow -- gas price in gwei for slow confirmation (~5 min)
  • standard -- gas price in gwei for standard confirmation (~2 min)
  • fast -- gas price in gwei for fast confirmation (~30s)
  • instant -- gas price in gwei for instant confirmation
  • transferCostUsd -- estimated USD cost for a simple ETH transfer
  • swapCostUsd -- estimated USD cost for a token swap
  • congestion -- network congestion level (low/medium/high)

Example response:

{"slow":0.008,"standard":0.012,"fast":0.018,"instant":0.025,"transferCostUsd":0.02,"swapCostUsd":0.05,"congestion":"low","chain":"base"}

When to use: submitting any on-chain transaction to pick the right gas tier. Essential for timing transactions and avoiding high-gas periods.

Not for: swap quotes (use dex_get_swap_quote), wallet balance (use wallet_get_portfolio).

Example agent prompts

  • "Current gas prices before submitting a transaction"
  • "Current gas prices before submitting a transaction"

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.

License

MIT

Frequently asked questions

What is Gas Oracle API?

Real-time gas prices, gwei tiers, USD cost estimates for Base and Ethereum. x402.

How do I install Gas Oracle API?

It runs as a remote server. In Claude Code: claude mcp add --transport sse gas-oracle-api 'https://gas-oracle.api.klymax402.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Gas Oracle API need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Gas Oracle API open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Gas Oracle API?

It is published by Br0ski777. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.