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HTTPay Gas Optimizer API
x402
HTTPay Gas Optimizer API is a paid API for AI agents from httpay.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Returns gas optimization recommendations for Ethereum/Base transactions, helping minimize transaction costs via pay-per-call x402 micropayments.
Price / call$0.01
Success—
StatusUnknown
How this service works
Gas optimizer for Base — current gas price, cost estimates for common operations, and optimal timing recommendation (live on-chain data)
Output
Returns gas optimization data including recommended gas price, fee estimates, and cost-saving suggestions for transactions on Base network, delivered as JSON.
Example use cases
Example prompt
“What's the optimal gas price I should use right now to minimize fees for a token swap transaction on Base — I want to avoid overpaying but still get it confirmed quickly.”
Technical details
Endpoint
POSThttps://httpay.xyz/api/gas-optimizerWhen to prefer
Use this endpoint when you need real-time gas optimization for Base or EVM-compatible transactions and want to pay per call via USDC micropayment without managing API keys or subscriptions. Prefer over alternatives when working in a crypto-native agent context that already supports x402 payment protocol.
Side effects
- Payment not provided — returns 402 with x402 payment required header
- Network congestion data unavailable — may return stale or empty recommendations
- Invalid or missing query parameters — returns 400 bad request
- Upstream gas oracle unavailable — returns 503 or empty example response
Input
{
"network": "base",
"transaction_type": "token_swap",
"estimated_gas_units": 150000
}Output
{
"meta": {
"x402": true,
"poweredBy": "Alfred Zhang 🫡"
},
"note": "Costs estimated using latest baseFee + median priority fee from last 5 blocks. Actual costs may vary.",
"chains": [
{
"ok": true,
"chain": "Base",
"chainId": 8453,
"baseFeeGwei": "0.0050",
"estimatedCosts": {
"swap": {
"costUsd": "$0.002015",
"gasUnits": 200000
},
"erc20Transfer": {
"costUsd": "$0.000655",
"gasUnits": 65000
},
"contractDeploy": {
"costUsd": "$0.020150",
"gasUnits": 2000000
},
"nativeTransfer": {
"costUsd": "$0.000212",
"gasUnits": 21000
}
},
"congestionLevel": "🟢 Low",
"priorityFeeGwei": "0.0010",
"suggestedMaxFeeGwei": "0.0060"
},
{
"ok": false,
"chain": "Ethereum",
"error": "Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
"chainId": 1
},
{
"ok": true,
"chain": "Arbitrum",
"chainId": 42161,
"baseFeeGwei": "0.0200",
"estimatedCosts": {
"swap": {
"costUsd": "$0.006707",
"gasUnits": 200000
},
"erc20Transfer": {
"costUsd": "$0.002180",
"gasUnits": 65000
},
"contractDeploy": {
"costUsd": "$0.067073",
"gasUnits": 2000000
},
"nativeTransfer": {
"costUsd": "$0.000704",
"gasUnits": 21000
}
},
"congestionLevel": "🟢 Low",
"priorityFeeGwei": "0.0000",
"suggestedMaxFeeGwei": "0.0200"
},
{
"ok": true,
"chain": "Optimism",
"chainId": 10,
"baseFeeGwei": "0.0000",
"estimatedCosts": {
"swap": {
"costUsd": "$0.000000",
"gasUnits": 200000
},
"erc20Transfer": {
"costUsd": "$0.000000",
"gasUnits": 65000
},
"contractDeploy": {
"costUsd": "$0.000002",
"gasUnits": 2000000
},
"nativeTransfer": {
"costUsd": "$0.000000",
"gasUnits": 21000
}
},
"congestionLevel": "🟢 Low",
"priorityFeeGwei": "0.0000",
"suggestedMaxFeeGwei": "0.0000"
}
],
"summary": "Cheapest for swap: Optimism at $0.000000. Ethereum mainnet is unknown congestion.",
"updatedAt": "2026-06-12T04:38:04.701Z",
"ethPriceUsd": 1676.83,
"recommendation": {
"tip": "✅ Now is a relatively low-fee period (early UTC). Good time to transact.",
"swapCostThere": "$0.000000",
"currentUtcHour": 4,
"currentlyGoodTime": true,
"cheapestChainForSwap": "Optimism"
},
"bestTimeWindows": [
{
"window": "02:00–06:00 UTC",
"description": "Late night US / early morning Europe — historically lowest activity"
},
{
"window": "10:00–12:00 UTC",
"description": "US pre-market, Europe mid-morning — moderate activity"
},
{
"window": "Weekend early UTC",
"description": "Saturdays 03:00–08:00 UTC often see 30–50% lower fees"
}
]
}Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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