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BaseBrief x402 – Base Chain Gas Oracle
x402
BaseBrief x402 – Base Chain Gas Oracle is a paid API for AI agents from basebrief-x402.savannah-5966.chatgpt.site, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).
Returns real-time gas prices, wallet balances, token metadata, and ERC-20 allowances from the Base mainnet blockchain for $0.004 per call.
Price / call$0.004
Success—
StatusUnknown
How this service works
Gas, balances, token metadata and allowances for $0.004 per result.
Output
A JSON object anchored to a specific Base mainnet block containing: current gas price/base fee, wallet ETH and token balances, ERC-20 token metadata (name, symbol, decimals), approved allowances for specified spender contracts, and evidence fields (chainId 8453, blockNumber, pointInTime flag) confirming the data is a snapshot from a live Base JSON-RPC node.
Example use cases
Pre-flight gas check before swap
“Before I submit this token swap on Base, can you check the current gas price and tell me if the network is congested right now?”
DeFi allowance audit for a wallet
“Check whether my wallet 0xAbC...123 has already approved the Aave contract on Base to spend my USDC, and how much the allowance is.”
Real-time balance dashboard for agent
“Fetch the current ETH balance, USDC balance, and block number for address 0xDef...456 on Base mainnet so I can decide whether to execute my strategy.”
Technical details
Endpoint
GEThttps://basebrief-x402.savannah-5966.chatgpt.site/api/v1/base/gasWhen to prefer
Choose this endpoint when an AI agent needs live, point-in-time Base mainnet state — gas prices, balances, or ERC-20 allowances — without setting up a full RPC node or Alchemy/Infura account. At $0.004/call it is cost-effective for sporadic lookups. Prefer it over generic Ethereum RPC providers when you specifically need Base L2 data with a pay-per-use x402 micropayment model and no API key management.
Side effects
- Invalid or malformed wallet/contract address returns an error or empty result
- Payment not received (x402 flow incomplete) results in 402 Payment Required response
- Base RPC node temporarily unavailable returns a 503 or timeout
- Querying a non-existent token contract returns null metadata
- Rate limiting if too many concurrent calls without payment
- Block reorganization edge cases may cause transient inconsistencies in pointInTime data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| required | string | |
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"evidence": {
"chain": "Base mainnet",
"chainId": 8453,
"blockNumber": "35123456",
"pointInTime": true
},
"limitations": [
"Point-in-time direct Base JSON-RPC evidence."
]
}
}Tags
x402
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