By default, Squid routes use exact input — you specify how much to send (fromAmount) and receive the best available output. With exact output, you specify how much you want to receive (toAmount) and the system calculates the required input amount.
This lets users say "I want to receive exactly X tokens" instead of "I want to send exactly X tokens."
Exact output requires the ExactOutputRouting feature flag. Contact the Squid team to enable it for your integrator ID.
Specify toAmount instead of fromAmount in your route request. Exactly one must be provided.
// Forward (existing) — specify how much to send
{
"fromAmount": "1000000000000000000",
"fromToken": "...",
"toToken": "..."
}
// Exact output — specify how much to receive
{
"toAmount": "1000000",
"fromToken": "...",
"toToken": "..."
}The response will include a calculated fromAmount representing how much input is needed to receive exactly toAmount. The toAmountMin will equal the toAmount — the output is guaranteed.
Slippage works in reverse compared to forward mode:
Output
May receive less than quoted
Guaranteed — toAmountMin = toAmount
Input
Fixed at fromAmount
May need to send slightly more
In exact output mode, slippage is applied to the input side. You may need to provide up to fromAmount × (1 + slippage) as input. Any unused input tokens are automatically returned to your address.
EVM single-chain swaps
✅
EVM-to-EVM cross-chain (Coral V2)
✅
All chains accessible via Coral V2
✅
Routes with post-hooks
✅
Routes with pre-hooks
❌
Traditional bridge (Axelar GMP, Chainflip, ITS, Noble CCTP)
❌
Cosmos routes (Osmosis, Astroport)
❌
Solana single-chain (Jupiter)
❌
Feature flag required — ExactOutputRouting must be enabled for your integrator ID.
No pre-hooks — Pre-hooks are not supported because the input amount is unknown at pre-hook execution time. Post-hooks work normally.
Coral V2 only for cross-chain — Traditional bridge protocols are not supported for cross-chain exact output routes.
Some DEXes unsupported — Paths through Curve, KyberSwap Elastic, Osmosis, Astroport, Printr, or Saddle will fail in exact output mode.
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