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Uniswap V2 Exact-Input Swap Calldata Builder
x402
Uniswap V2 Exact-Input Swap Calldata Builder is a paid API for AI agents from evm-canon-base.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Builds Uniswap-V2-style exact-input swap calldata for a given token path, ready to submit on-chain.
Price / call$0.01
Success—
StatusUnknown
How this service works
Build Uniswap-V2-style exact-input swap calldata with the token path
Output
Returns ABI-encoded calldata for a Uniswap-V2-style swapExactTokensForTokens (or equivalent exact-input) function call, including the function selector and all encoded parameters (amountIn, amountOutMin, path array, recipient, deadline). The calldata is ready to be submitted as the `data` field of an EVM transaction to a compatible Uniswap V2 router contract.
Example use cases
Multi-hop DeFi swap transaction
“I want to swap 500 USDC for WETH and then into cbETH in a single exact-input swap — can you build the Uniswap-V2-style calldata for the full path with 1% slippage and a 30-minute deadline, sending output to my wallet 0xDead...Beef?”
Automated DeFi rebalancing bot
“My rebalancing bot needs to swap 1000 DAI directly to USDC using a Uniswap-V2-compatible router — generate the exact-input swap calldata for that single-hop path with 0.3% slippage and recipient address 0x1234...5678.”
On-chain swap calldata for wallet integration
“Build the encoded calldata for a Uniswap-V2-style swapExactTokensForTokens call: 250 WETH in, path is WETH → USDC, 0.5% max slippage, recipient 0xABCD...EF01, deadline 15 minutes from now.”
Technical details
Endpoint
POSThttps://evm-canon-base.onrender.com/encode/swapWhen to prefer
Choose this endpoint when you need deterministic, auditable Uniswap-V2-compatible swap calldata built server-side without running a local ABI encoder or web3 library. Ideal for agents that need to construct DeFi swap transactions on Base or EVM-compatible chains without embedding a full Uniswap SDK, especially when human-readable amounts and token symbols need to be resolved to exact calldata. Prefer over raw ABI encoding when you want built-in risk flagging and decimal resolution.
Side effects
- Invalid or unrecognized token addresses in the path returns an error
- Malformed path array (fewer than 2 tokens) causes a validation failure
- Slippage out of acceptable range returns a parameter error
- Missing required fields (amount, path, recipient, deadline) returns a 400-level error
- Token not found in the pinned registry may cause resolution failure
- Payment not included or insufficient (x402) results in a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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