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Hermes Data API – Ethereum Gas Fees
x402
Hermes Data API – Ethereum Gas Fees is a paid API for AI agents from x402-api-blond.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Returns current Ethereum network gas prices (fast, safe, and propose tiers in Gwei) sourced from Etherscan, paid per-call via x402/USDC.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call data API: crypto prices (CoinGecko), China A-share quotes (Sina), weather (Open-Meteo), forex rates, and Ethereum gas fees. Payments via x402 protocol, USDC on Base.
Output
A JSON object with a Unix millisecond timestamp, the data source ('etherscan'), and three Gwei values: fast_gwei (quick inclusion), safe_gwei (low-priority), and propose_gwei (standard recommended), e.g. {ts: 1750000000000, source: 'etherscan', fast_gwei: 0.083, safe_gwei: 0.07, propose_gwei: 0.074}.
Example use cases
DeFi transaction timing optimization
“Before I submit my Ethereum swap, check the current gas prices and tell me the fast, safe, and propose Gwei tiers so I can decide whether to send now or wait.”
Smart contract deployment cost check
“I'm about to deploy a contract on Ethereum — what's the current gas price in Gwei across fast, safe, and propose tiers?”
Automated gas price alerting
“Keep an eye on Ethereum gas fees and let me know when the safe Gwei drops below 0.05 so I can time my transaction cheaply.”
Technical details
Endpoint
POSThttps://x402-api-blond.vercel.app/eth/gasWhen to prefer
Choose this endpoint when you need real-time Ethereum gas fee data in a pay-per-call, no-subscription model using USDC on Base via x402 protocol. Ideal for agents operating in crypto-native or DeFi contexts that already handle x402 payments and need fresh Gwei tiers (fast/safe/propose) without managing Etherscan API keys directly.
Side effects
- Payment failure: x402 USDC payment on Base rejected or insufficient balance — endpoint returns 402 Payment Required
- Upstream Etherscan API unavailable — may return 503 or stale data
- Invalid MCP tool descriptor structure in request body — returns 400 Bad Request
- Network timeout fetching from Etherscan — delayed or error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ts": 1750000000000,
"source": "etherscan",
"fast_gwei": 0.083,
"safe_gwei": 0.07,
"propose_gwei": 0.074
}
}Tags
x402
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