InstaSwap is a small operator covering the major assets and chains, with a fixed-rate option and a simple flow. Nothing about it is broken and nothing about it is compelling.
Pricing
The embedded margin runs roughly 0.5% to 1% depending on the pair, above FixedFloat, SideShift and Exolix. Nothing in the interface itemises it, so the only way to know your actual cost is to compare against market mid.
The evidence problem
The most useful information about a service in this category is how it behaves under stress: does it honour fixed quotes when the market moves, does it return deposits it will not process, does it answer when a swap stalls. For InstaSwap there is simply not much public evidence either way, which is itself a reason to prefer a service with a longer, better-documented record.
Who should use InstaSwap
Users making a one-off swap who happened to arrive here, at an amount small enough that the outcome does not matter much. For anything else, the transparent tier is cheaper and the aggregators will show you why.