Gas Oracle X402
About
Live gas prices with gwei tiers, USD cost estimates, and congestion level. Time your transactions perfectly. -- x402 micropayment API + MCP server for AI agents
Details
- Author
- Br0ski777
- Downloads
- 333
- Categories
- Database
Jump to
- Live gas prices with slow/standard/fast/instant tiers
- USD cost estimates for ETH transfers and token swaps
- Network congestion level (low/medium/high)
- Pay‑per‑call via x402 (USDC on Base L2)
- No signup, no API key, no rate limits
- Part of the klymax402 marketplace of 100 APIs
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
Gas Oracle X402Command (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Add the MCP server URL to your MCP client config (e.g., Claude Desktop, Cursor, ElizaOS) as https://gas-oracle.api.klymax402.com/mcp. For HTTP access, call GET /api/price with any x402‑aware client; the 402 response triggers automatic payment and retry. The primary tool is gas_get_current_price, which accepts an optional chain parameter (default: base).
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"gas oracle x402": {
"gas-oracle-x402": {
"url": "https://gas-oracle-x402-production.up.railway.app/mcp",
"transport": "sse"
}
}
}
}McpServers
{
"gas-oracle-x402": {
"url": "https://gas-oracle-x402-production.up.railway.app/mcp",
"transport": "sse"
}
}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
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
| gas_get_current_price | GET | /api/price | $0.001 | Get current gas prices with slow/standard/fast/instant tiers |
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
| Name | Type | Required | Description |
|---|---|---|---|
| chain | string | no | Blockchain 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"
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
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