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Base Gas Oracle (EIP-1559 Fee Estimator)
x402
Base Gas Oracle (EIP-1559 Fee Estimator) 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 real-time EIP-1559 gas fee tiers (slow/standard/fast), base fee, network congestion score, and estimated transaction cost in ETH and USD for the Base L2 blockchain.
Price / call$0.001
Success—
StatusUnknown
How this service works
Base gas oracle for agents sending Base txs: EIP-1559 slow / standard / fast tiers (maxFeePerGas + maxPriorityFeePerGas in gwei and wei hex, from eth_feeHistory 20 blocks p10/p50/p90), base fee, congestion 0-1, recommended_tier, ready-to-sign tx_fields, and est. cost in ETH + USD for your gas_limit (default 21000; use 65000 for an ERC-20 transfer). Cheapest paid call ($0.001).
Output
A JSON object containing: the current block number, all three EIP-1559 fee tiers (slow/standard/fast) each with maxFeePerGas and maxPriorityFeePerGas in both gwei and wei hex, base_fee_gwei, gas_price_gwei, network congestion score (0–1), the recommended_tier string, ready-to-sign tx_fields (type, gas, maxFeePerGas, maxPriorityFeePerGas in hex), estimated transfer cost in ETH and USD for the requested gas_limit, and a timestamp.
Example use cases
Pre-flight gas check for token transfer
“Before I send this ERC-20 token on Base, what's the current gas price? Use 65000 gas units and tell me the estimated cost in USD and which fee tier you recommend.”
Congestion-aware onchain agent routing
“Is the Base network congested right now? Give me the congestion score and current slow/standard/fast gas tiers so I can decide whether to wait or send immediately.”
ETH cost estimation for a simple transfer
“How much ETH will a basic ETH transfer cost me on Base at the current gas price? Use the default 21000 gas limit and show me the fast tier cost.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/crypto/base-gas?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your agent needs real-time, structured EIP-1559 gas fee data specifically for the Base L2 network, including ready-to-sign tx_fields and USD cost estimates. It is ideal for onchain trading bots, DeFi automation agents, or any workflow that must decide whether to submit a transaction now or wait. At $0.001 per call it is extremely cheap for programmatic gas checking. Prefer this over generic Ethereum gas oracles when targeting Base, and over RPC-direct calls when you want pre-computed tiered recommendations with congestion context.
Side effects
- Base RPC unavailable: upstream eth_feeHistory call fails, returns 5xx error
- Payment failure: x402 USDC payment not provided or insufficient, returns 402 Payment Required
- Invalid gas_limit: value outside 21000–30000000 range returns 400 validation error
- Stale data: if Base RPC is slow, updated_at may lag by several blocks
- Network congestion spike: fast-tier fee estimates may be outdated within seconds during high volatility
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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