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Base Gas Price Oracle (x402)
x402
Base Gas Price Oracle (x402) 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 across slow/standard/fast tiers with estimated USD costs, congestion level, and EIP-1559 fee fields, paid per-call via x402 micropayment.
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
JSON object containing: current block number, chain ID (8453), base fee in gwei, gas price in gwei, congestion score (0–1), recommended tier, per-tier breakdown (slow/standard/fast) with max_fee_gwei, max_priority_fee_gwei, and est_cost_usd, plus ready-to-use EIP-1559 tx fields (hex-encoded maxFeePerGas, maxPriorityFeePerGas, gas, type), estimated transfer cost in ETH, data sources, and timestamp.
Example use cases
Pre-trade gas cost check
“Before I submit this swap on Base, what's the current standard gas fee in gwei and how much will it cost in USD for 150000 gas units?”
Congestion-aware transaction timing
“Is the Base network congested right now? I want to know the congestion level and whether I should wait before sending my transaction.”
Trading bot EIP-1559 parameter fetch
“Give me the maxFeePerGas and maxPriorityFeePerGas hex values I should use for a fast Base transaction right now — my bot needs to set these fields before broadcasting.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/v1/gas?utm_source=zero.xyzWhen to prefer
Use this endpoint when your agent operates on the Base L2 network and needs real-time, tiered gas price data with USD cost estimates before submitting transactions. Prefer it over generic Ethereum gas oracles because it is Base-specific (chain_id 8453), returns EIP-1559 hex fields ready for tx construction, and requires no API key — only a $0.001 USDC micropayment via x402. Best for autonomous trading agents, DeFi bots, or on-chain workflow orchestrators that need to make cost-aware decisions at runtime.
Side effects
- Payment not attached or insufficient USDC → 402 Payment Required with payment instructions
- RPC upstream failure from mainnet.base.org → 502/503 with error message
- gas_limit below 21000 or above 30000000 → 400 validation error
- Network timeout if Base RPC is slow → 504 Gateway Timeout
- Stale data if upstream RPC is lagging — check updated_at field
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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