BEP48: Changes to Trading Fees and Cancellation

[wjmelements]

This introduces a draft of BEP48, which solves a critical issue where traders are incentivized to partial-fill their own orders to avoid cancellation fees. It introduces two major changes:

• Cancellation fee is proportional to open order time
• Fulfilled and partially-filled orders pay the difference between due cancellation fee and cumulative trading fee when they close

Several of these variables are parameterized so they can be reconfigured in the future without a hard fork.

[wjmelements]

Additional motivation (included in BEP):

• Smaller cancellation fees for short-term orders would make it economical to provide tighter spreads as a market maker.
• Longer-lived orders than 3 days are somewhat desired by the community.

[brilliant-lx]

outdate, archive it.