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Base Gas Oracle – EIP-1559 Fee Tiers
x402
Base Gas Oracle – EIP-1559 Fee Tiers is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Returns current Base network gas prices in slow/standard/fast EIP-1559 tiers with estimated USD costs, congestion level, and ready-to-use tx fields for a given gas limit.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.
Output
A JSON object with the current Base block number, base fee in gwei, slow/standard/fast EIP-1559 tiers (each with maxFeePerGas, maxPriorityFeePerGas, and estimated USD cost), a congestion score 0–1, the recommended tier, and ready-to-use hex-encoded tx fields (type 0x2, gas, maxFeePerGas, maxPriorityFeePerGas).
Example use cases
Pre-flight gas check before sending payment
“Before I send this USDC transfer on Base, check the current gas fees and tell me the recommended tier with its estimated USD cost so I know how much the tx will actually cost me.”
Congestion monitoring for trade timing
“Is the Base network congested right now? Give me the current gas tiers so I can decide whether to wait for lower fees before submitting my trade.”
Gas estimation for a complex contract call
“I'm about to call a DeFi contract on Base that uses about 150000 gas units — what will that cost me in USD at the standard and fast tiers right now?”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/crypto/gas?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs real-time EIP-1559 gas parameters specifically for Base mainnet before constructing or pricing a transaction. Prefer it over generic Ethereum gas APIs when the target chain is Base (chain_id 8453). The pay-per-call x402 model (no API key required) makes it ideal for autonomous agents that cannot manage long-lived credentials.
Side effects
- RPC unavailability from mainnet.base.org causes 502/503 with no gas data
- Payment failure (402) if x402 USDC payment on Base is not included or insufficient
- Invalid gas_limit outside 21000–30000000 range returns 400 validation error
- Stale data if Base RPC is lagging; updated_at timestamp indicates freshness
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"block": 37000000,
"chain": "base",
"tiers": {
"fast": {
"est_cost_usd": 0.0007,
"max_fee_gwei": 0.025,
"max_priority_fee_gwei": 0.01
},
"slow": {
"est_cost_usd": 0.0005,
"max_fee_gwei": 0.006,
"max_priority_fee_gwei": 0.001
},
"standard": {
"est_cost_usd": 0.0005,
"max_fee_gwei": 0.011,
"max_priority_fee_gwei": 0.001
}
},
"sources": [
"https://mainnet.base.org"
],
"chain_id": 8453,
"tx_fields": {
"gas": "0x5208",
"type": "0x2",
"maxFeePerGas": "0xa7d8c0",
"maxPriorityFeePerGas": "0xf4240"
},
"congestion": 0.42,
"updated_at": "2026-10-29T13:30:00Z",
"base_fee_gwei": 0.005,
"gas_price_gwei": 0.006,
"recommended_tier": "standard",
"gas_price_wei_hex": "0x5b8d80",
"est_transfer_cost_eth": 1.26e-7,
"max_priority_fee_gwei": 0.001,
"max_priority_fee_wei_hex": "0xf4240"
}
}Tags
x402
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