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In this context a small number of Schemes are bilaterally agreed between the venue and the Maker. Each Maker client is associated with a single Scheme. The Maker uses each Scheme to provide a custom combination of currency pairs, available liquidity (no. of rungs, and associated quantities), spread, granularity of pricing and so on. Each volume ladder update is complete and self-contained.

Currenex does not operate like this. Instead a larger set of "Tiers" are agreed between the Venue and the Maker. Each Tier is essentially a single bid-offer rung (i.e. not a Ladder), for an arbitrary set of currencies. Currenex can be configured to associate each Tier with a specific quantity which will be specified in the associated subscription request. If not configured, the maker may provide whatever volume they wish, from update to update. 

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