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Base Gas Fee Quote
x402
Base Gas Fee Quote is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Returns a current gas fee quote for a given transaction gas limit on the Base (EIP-155:8453) network, including risk assessment flags and risk score.
Price / call$0.003
Success—
StatusUnknown
How this service works
Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.
Output
Returns a JSON object containing the network identifier (eip155:8453), product name (base-gas-fee-quote), and an assessment object with a risk_score, risk_level (e.g. 'low'), and any risk flags. Allows agents to understand current gas costs and risk profile before committing to a Base transaction.
Example use cases
Example prompt
“Before I submit this transaction, can you get me a gas fee quote on the Base network for a gas limit of 200000 and let me know if there are any risk flags?”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/base/gas-fee-quoteWhen to prefer
Use this endpoint when an agent needs a real-time gas fee estimate with integrated risk assessment specifically for the Base (EIP-155:8453) network before executing or signing a transaction. Prefer this over generic gas estimators when you need machine-readable risk flags and a structured preflight safety check in a single call.
Side effects
- Missing or invalid gas_limit parameter (non-numeric string) returns a validation error
- Network congestion or RPC unavailability may cause timeouts or stale quotes
- Payment of $0.003 USDC not fulfilled causes 402 Payment Required response
- gas_limit of 0 or extremely large values may return unexpected results or errors
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"gas_limit": "200000"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"fees": {
"base_fee_wei": "5000000",
"base_fee_gwei": "0.005",
"gas_price_wei": "7216118",
"gas_price_gwei": "0.007216118",
"priority_fee_wei": "2224187",
"priority_fee_gwei": "0.002224187"
},
"network": "eip155:8453",
"product": "base-gas-fee-quote",
"gas_limit": "200000",
"fetched_at": "2026-07-01T04:12:15.127Z",
"provenance": {
"block_tag": "latest",
"rpc_providers": [
"https://base.blockscout.com/api/eth-rpc",
"https://mainnet.base.org",
"https://base-rpc.publicnode.com"
]
},
"limitations": [
"The estimate uses the supplied gas limit and current gas price, not transaction simulation.",
"Fees can change before a transaction is submitted or included."
],
"block_number": 48044893,
"estimated_cost": {
"eth": "0.0000014432236",
"wei": "1443223600000"
},
"schema_version": "1.0",
"block_utilization_percent": 4.9831
}Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "base-gas-fee-quote",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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