Pre-Fill-Swap
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Solvers exclusively hold reserve assets to simplify accounting and minimize risk exposure. The green-highlighted section in the diagram below illustrates the Pre-Fill-Swap, an intermediary step in the order fulfillment process that occurs when the requested assets are not reserve assets.
When the order requests reserve assets, this swap step is skipped, as solvers are expected to maintain sufficient balances of reserve assets at all times.
The DLN supports requesting arbitrary assets on the destination chain. When a requested assets are not reserve assets, the solver performs a Pre-Fill-Swap—similar in concept to a Pre-Order-Swap, but reversed. In this case, the solver swaps reserve assets for the requested assets and transfers the guaranteed amount to the beneficiary address on the destination chain specified in the order.
