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x402.onchainexpat.com Gas Oracle
x402
x402.onchainexpat.com Gas Oracle is a paid API for AI agents from x402.onchainexpat.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Returns real-time gas price estimates and fee recommendations (low/medium/high/instant tiers) for Base and Solana chains, including USD cost estimates and transaction timing guidance.
Price / call$0.01
Success—
StatusUnknown
How this service works
Real-time gas price estimates and fee recommendations across supported chains (e.g., Base and Solana) for accurate transaction cost calculations.
Output
Returns a structured object with EIP-1559 base fee and priority fee tiers (low/medium/high/instant) in wei and gwei, estimated confirmation times in seconds, transfer costs in ETH and USD, current ETH price in USD, network status (e.g. 'low'/'medium'/'high'), a recommendation on whether to transact now, and the chain's block time.
Example use cases
Example prompt
“What are the current gas prices on Base — give me the low, medium, high, and instant fee tiers in gwei and USD, and tell me whether I should transact now or wait?”
Technical details
Endpoint
POSThttps://x402.onchainexpat.com/api/x402-crypto/gas-oracleWhen to prefer
Use this endpoint when an AI agent needs real-time, chain-specific gas fee data with USD cost estimates and a human-readable transaction recommendation — especially for Base or Solana. Prefer over generic RPC calls when you need tiered fee suggestions (low/medium/high/instant) with confirmation time estimates and network congestion level already computed.
Side effects
- Unsupported chain identifier returns an error or empty data
- RPC node unavailability may cause stale or failed gas reads
- Missing or malformed 'chain' field in request body results in 400 error
- Cached:false indicates live fetch which may have higher latency under load
Input
{
"chain": "base"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | Blockchain (default: ethereum) |
Output
{
"data": {
"chain": "base",
"source": "rpc",
"eip1559": {
"base_fee_wei": 5000000,
"base_fee_gwei": 0.005,
"priority_fee_low": 0.001,
"priority_fee_high": 0.011149,
"priority_fee_medium": 0.00109
},
"chain_name": "Base",
"gas_prices": {
"low": {
"wei": 5175000,
"gwei": 0.005175,
"estimated_seconds": 180,
"transfer_cost_eth": 1.1e-7,
"transfer_cost_usd": 0.0002
},
"high": {
"wei": 16149000,
"gwei": 0.016149,
"estimated_seconds": 15,
"transfer_cost_eth": 3.4e-7,
"transfer_cost_usd": 0.0006
},
"medium": {
"wei": 6090000,
"gwei": 0.00609,
"estimated_seconds": 60,
"transfer_cost_eth": 1.3e-7,
"transfer_cost_usd": 0.0002
},
"instant": {
"wei": 19378799,
"gwei": 0.019379,
"estimated_seconds": 6,
"transfer_cost_eth": 4.1e-7,
"transfer_cost_usd": 0.0007
}
},
"eth_price_usd": 1664.92,
"native_symbol": "ETH",
"network_status": {
"level": "low",
"gas_gwei": 0.00609,
"description": "Network is quiet"
},
"recommendation": {
"action": "transact_now",
"reason": "Base has low transaction costs",
"urgency": "low"
},
"block_time_seconds": 2
},
"cached": false,
"success": true,
"timestamp": "2026-06-13T04:28:58.176312+00:00"
}Schema · Response
| Field | Type | Description |
|---|---|---|
| data | object | |
| success | boolean |
Tags
x402
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