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Base Network Effective Gas Price Calculator
x402
Base Network Effective Gas Price Calculator is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Calculates the effective gas price for a transaction on the Base (OP Stack) network given caller-supplied EVM fee parameters
Price / call$0.005
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing the computed effective_gas_price, realized_priority_fee_per_gas, cap_headroom, execution_fee, and the original input parameters (base_fee_per_gas, max_fee_per_gas, max_priority_fee_per_gas, gas). Also includes network_context describing the OP Stack fee model, accepted chain IDs (Base mainnet 8453 and testnet 84532), and the mode used (evm_effective_price). A warnings field notes that this does not estimate future or live fees. The response also includes a receipt with payment metadata.
Example use cases
Verify gas fee before submitting transaction
“I'm about to submit a transaction on Base mainnet with a base fee of 80 gwei, max fee of 100 gwei, and priority fee of 3 gwei — can you compute the effective gas price I'll actually pay so I can confirm it's reasonable before I send it?”
Optimize priority fee for fast inclusion
“I want to know the realized priority fee and cap headroom if I set my max fee per gas to 150 gwei, base fee is 120 gwei, and I'm offering a 10 gwei priority fee — run the effective gas price calculation so I can decide whether to raise or lower my tip.”
Audit historical transaction fee parameters
“I have a Base network transaction where the base fee was 95 gwei, max fee was 110 gwei, and max priority fee was 4 gwei — calculate the effective gas price and break down the OP Stack fee components so I can reconcile my gas cost records.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/base_effective_gas_price_calculate/invokeWhen to prefer
Choose this endpoint when you need to deterministically compute the effective gas price from caller-supplied EVM fee parameters on the Base (OP Stack) network, rather than fetching live gas prices from the chain. It is ideal for pre-flight transaction cost verification, fee auditing, or building gas estimation tooling where you already have the fee parameters and want to derive the realized cost without a live RPC call. It is not suitable for fetching current on-chain gas prices or forecasting future gas prices.
Side effects
- Invalid or malformed request_json input returns an error
- Missing required fee parameter fields in the JSON payload causes computation failure
- Providing non-numeric values for gas parameters results in a validation error
- request_json string exceeding 65536 characters is rejected
- Network or service unavailability returns a failed status in the receipt
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Does not estimate future or live fees."
],
"service_id": "base_effective_gas_price_calculate",
"analysis_json": "{\"base_fee_per_gas\":\"100\",\"cap_headroom\":\"20\",\"effective_gas_price\":\"105\",\"execution_fee\":\"0\",\"gas\":\"0\",\"max_fee_per_gas\":\"120\",\"max_priority_fee_per_gas\":\"5\",\"mode\":\"evm_effective_price\",\"network_context\":{\"accepted_chain_ids\":[\"8453\",\"84532\"],\"deposit_transaction_type\":\"0x7e\",\"fee_model\":\"L2 execution plus caller-supplied L1 data/operator components\",\"protocol_family\":\"OP Stack\"},\"realized_priority_fee_per_gas\":\"5\"}",
"evidence_scope": "caller_supplied_data",
"analyzed_network": "base"
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "base_effective_gas_price_calculate",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "5000",
"resultSha256": "df883f12ec84e2f1145d002313d7cc571026ede628c6a71a044ec0a367e34c35",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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