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Uniswap V2 Swap Output Calculator
x402
Uniswap V2 Swap Output Calculator is a paid API for AI agents from golf-evm-math.x402-evm-math.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-28).
Computes exact integer swap output amount, price impact, and post-swap reserves for a Uniswap-V2 style constant-product AMM trade.
Price / call$0.002
Success—
StatusUnknown
How this service works
Exact EVM address, calldata, Uniswap V2/V3 and impermanent-loss math. Pay per call in USDC on Base via x402.
Output
Returns an exact integer amount_out (in base units) representing the tokens received, along with the price impact as a percentage and the updated reserve balances after the hypothetical swap — all computed using integer arithmetic consistent with Uniswap V2 smart contract logic.
Example use cases
Pre-trade slippage check for a bot
“Before I execute this on-chain, tell me exactly how many tokens I'll receive and what the price impact will be if I swap 500,000 base units into a pool with 10,000,000 reserve_in and 8,000,000 reserve_out, using the standard 30 bps fee.”
Custom fee tier swap simulation
“I'm using a fork of Uniswap V2 with a 50 bps fee. Given reserve_in of 2,000,000 and reserve_out of 3,500,000, what's the exact integer output if I put in 100,000 units, and what will the reserves look like after?”
Arbitrage opportunity sizing
“I need to figure out the precise output and post-swap reserves for a 5,000,000 unit swap on a V2 pool with reserve_in 20,000,000 and reserve_out 18,000,000 at 30 bps, so I can compare it to the price on another DEX.”
Technical details
Endpoint
GEThttps://golf-evm-math.x402-evm-math.workers.dev/defi/v2-swap?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need bit-accurate, integer-safe Uniswap V2 swap math without running a local simulation or calling an RPC node. It is ideal for bots, arbitrage engines, and smart-contract pre-flight checks that require exact on-chain-equivalent arithmetic (not floating-point approximations) for V2-style constant-product AMMs.
Side effects
- Missing required parameters (reserve_in, reserve_out, amount_in) returns an error
- Non-integer or float values for reserve/amount fields may cause rejection
- amount_in exceeding reserve_out causes an invalid or zero output
- Very large integers beyond uint256 range may produce overflow errors
- Network or worker timeout returns a 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"amount_out": "499248..."
}
}Tags
x402
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