Returns historical trades split by buy/sell side, ordered newest-first.

Supports keyset cursor pagination over (created_at, id) so callers can
walk the full history a page at a time. To paginate, take the next_cursor
from the response and pass it as the cursor query parameter on the next
request. Continue until has_more is false.

DeFiLlama backfills should set settled_only=true, provide an explicit
UTC time window, and use the maximum page size of 5000.

No authentication required.