Summary
Pulls real-time gas price data for Ethereum and Base networks through a dedicated API endpoint. You get current gwei rates across priority tiers (low, medium, high) and USD cost estimates for common operations like swaps and transfers. Built with x402 USDC micropayments integration, so each API call costs a small amount rather than requiring API keys or subscriptions. Reach for this when you're building crypto tools that need to help users time transactions or estimate fees before they commit. The MCP server connects via SSE transport and talks to gas-oracle.api.klymax402.com under the hood.
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Public tool metadata for what this MCP can expose to an agent.
1 tools
gas_get_current_priceUse this when you need current gas prices before submitting a transaction. Returns gas tiers and USD cost estimates in JSON. 1. slow: gas price in gwei for slow confirmation (~5 min) 2. standard: gas1 params
Use this when you need current gas prices before submitting a transaction. Returns gas tiers and USD cost estimates in JSON. 1. slow: gas price in gwei for slow confirmation (~5 min) 2. standard: gas
Parameters* required
chainstringBlockchain network (default: base)one of
base · ethereumGas 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 confirmationtransferCostUsd-- estimated USD cost for a simple ETH transferswapCostUsd-- estimated USD cost for a token swapcongestion-- 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
Featured
Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Give your AI agent a complete email layer—sending, inbound inboxes, and sandbox testing.
Get 4K emails/month free →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →
