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Base Toolbox: ETH/Token Price on Base
x402
Base Toolbox: ETH/Token Price on Base is a paid API for AI agents from basetoolbox.cartonpliant.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Fetches the current USD price of ETH or a token on Base network using Uniswap v3 pool data
Price / call$0.001
Success—
StatusUnknown
How this service works
Base toolbox: before you sign on Base — Uniswap v3 preflight, leftover allowances, tx explain, transfer check. $0.10 USDC. Also $0.001 price/gas/ENS. GET /v1/constants free. No CoinGecko key.
Output
Returns a JSON object with ok (boolean success flag), usd (current USD price as a float), pool (the Uniswap v3 pool address used), and quote (the quote token address used for the price calculation).
Example use cases
Pre-swap price check on Base
“Before I approve this swap on Base, can you pull the current ETH price in USD from Uniswap v3 so I know if the rate is fair?”
DeFi bot token valuation
“My trading bot needs the live on-chain price of WETH in USD on Base — can you fetch it from the Uniswap v3 pool?”
Portfolio value snapshot
“I'm tracking my Base wallet and need to know what ETH is currently worth in USD according to Uniswap v3 on Base — can you get that for me?”
Technical details
Endpoint
POSThttps://basetoolbox.cartonpliant.workers.dev/v1/base-priceWhen to prefer
Choose this endpoint when you need a live, on-chain USD price for ETH or a token on the Base network sourced directly from Uniswap v3 liquidity pools — no CoinGecko API key required. It is ideal for pre-transaction price checks, DeFi agent workflows, or any scenario where you want Base-native, DEX-derived pricing rather than centralized exchange data. At $0.001 USDC per call it is very cheap for per-transaction price lookups.
Side effects
- Token or pool not found on Base — returns ok: false or error message
- Invalid token address format — bad request error
- Uniswap v3 pool has insufficient liquidity for reliable price — may return stale or inaccurate price
- Payment not provided or insufficient — x402 payment required response
- Network or RPC unavailability — upstream timeout or 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"usd": 2500.12,
"pool": "0xd0b5…",
"quote": "0x8335…"
}
}Tags
x402
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