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x402 Base Tools – Gas & Transaction Cost Oracle
x402
x402 Base Tools – Gas & Transaction Cost Oracle is a paid API for AI agents from base.kagurazaka.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-29).
Returns current Base network gas fees (base fee, priority fee percentiles, L1 data fee) and the USD/ETH cost of common transaction types including ETH transfers, ERC-20 transfers, USDC x402 payments, swaps, and NFT mints.
Price / call$0.001
Success—
StatusUnknown
How this service works
Current Base gas: base fee, priority fee percentiles over the last 10 blocks, the L1 data fee of a typical transaction, and what an ETH transfer, an ERC-20 transfer, a USDC transferWithAuthorization (an x402 payment), a swap and an NFT mint cost now in ETH and USD (ETH/USD from Chainlink).
Output
A JSON object containing the current block number, ETH/USD price (from Chainlink), base fee in gwei, priority fee percentiles (low/medium/high) in gwei, and a cost breakdown for common transaction types (ETH transfer, ERC-20 transfer, USDC transferWithAuthorization, swap, NFT mint) each expressed in both ETH and USD.
Example use cases
Pre-transaction cost check for DeFi bot
“Before I execute this swap on Base, tell me what the current gas fees are and how much the swap will cost me in USD right now.”
x402 payment fee estimation
“I'm about to send a USDC transferWithAuthorization payment on Base — what will that cost me in ETH and USD at current gas prices?”
NFT minting cost dashboard
“What does it cost in USD to mint an NFT on Base right now, and what's the current ETH price from Chainlink?”
Technical details
Endpoint
GEThttps://base.kagurazaka.dev/v1/gas?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a single, unified snapshot of Base network gas conditions AND the real USD cost of specific transaction types (including x402/USDC payments) — especially when you need ETH/USD pricing from Chainlink baked in. Prefer this over raw RPC calls when you want pre-calculated USD costs for ETH transfers, ERC-20 transfers, swaps, and NFT mints without doing the math yourself.
Side effects
- Chainlink price feed unavailable — ETH/USD price may be stale or missing
- Base RPC node timeout — may return 502/503 if upstream node is unresponsive
- x402 payment failure — endpoint costs $0.001 USDC per call; unpaid requests return 402
- Gas oracle calculation error if block data is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"block": "37000000",
"costs": {
"eth_transfer": {
"eth": 7e-7,
"gas": 21000,
"usd": 0.0017
}
},
"eth_usd": 2356.9,
"base_fee_gwei": 0.005,
"priority_fee_gwei": {
"low": 0.0006,
"high": 0.01,
"medium": 0.002
}
}
}Tags
x402
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