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Uniswap V3 On-Chain Swap Quote
x402
Uniswap V3 On-Chain Swap Quote is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Returns a real-time Uniswap V3 swap quote for any token pair including estimated output amount, effective exchange rate, and optimal fee tier across Base, Ethereum, Arbitrum, Optimism, and Polygon.
Price / call$0.01
Success—
StatusUnknown
How this service works
On-chain Uniswap V3 swap quote for any token pair - estimated output amount, effective rate and best fee tier, read directly from pools across Base/Ethereum/Arbitrum/Optimism/Polygon - real-time executable pricing agents need before swapping that LLMs cannot compute. swap quote, swap estimate, uniswap quote, token swap rate, dex quote, how much will i get
Output
Returns the estimated output token amount, the effective exchange rate (price per token), the recommended fee tier (e.g. 0.05%, 0.3%, 1%), and pool details — all read live from Uniswap V3 pools on the specified chain, giving the agent executable pricing data before a swap is submitted.
Example use cases
Example prompt
“Before I swap 1 ETH for USDC on Base, can you get me a live Uniswap V3 quote — how much USDC I'd receive, the effective rate, and which fee tier gives the best price?”
Technical details
Endpoint
GEThttps://api.x402node.dev/defi/swap-quoteWhen to prefer
Use this endpoint when an agent needs real-time, on-chain executable swap pricing from Uniswap V3 specifically — especially before executing a DEX swap transaction. Prefer this over centralized exchange price feeds when the user intends to trade on-chain via Uniswap, needs fee tier optimization, or requires multi-chain coverage across Base, Ethereum, Arbitrum, Optimism, and Polygon. This is the right choice when accuracy of the on-chain quote matters more than a general market price.
Side effects
- Token pair has no Uniswap V3 liquidity pool on the selected chain — returns error indicating no pool found
- Unsupported chain specified — returns error listing supported networks
- Invalid token address format — returns validation error
- Input amount too small or too large for available pool liquidity — may return high price impact warning or error
- RPC node timeout causes stale or failed quote — returns upstream error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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