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spec-drift/kalshi: Fill schema — side + action deprecated (May 14 2026); outcome_side, book_side missing #1188
Description
Summary
The Kalshi v2 API deprecated side and action on the Fill schema (same May 14, 2026 deadline as Trade) and added outcome_side and book_side as replacements. The PMXT spec (core/specs/kalshi/Kalshi.yaml v3.7.0) retains the deprecated fields and does not include the replacements.
API changes — Fill schema
Deprecated (removal deadline May 14, 2026)
side— was"yes"or"no"action— was"buy"or"sell"
Added
| Field | Type | Description |
|---|---|---|
outcome_side |
string | "yes" or "no" — which outcome was filled |
book_side |
string | "bid" or "ask" — which side of the book was filled |
Impact
Any normalizer code reading side or action from fill data may receive null/undefined for fills settled after the deprecation deadline. The new fields are unavailable for P&L or trade direction display.
Spec file
core/specs/kalshi/Kalshi.yaml — Fill schema needs side and action marked deprecated and the two new fields added.
See also: companion issue for Trade schema deprecations (#1187).
Activity
realfishsam commentedon Jun 24, 2026
Triage: removed
P1: highbecause the Kalshi deprecation deadline (May 14 2026) has now passed — today is June 24 2026, 41 days after the deadline. Theside+actionfields have been removed from Fill responses andoutcome_side/book_sideare now required. Fill data is silently wrong or broken in production. AddedP0: criticalinstead.Generated by Claude Code
realfishsam commentedon Aug 4, 2026
Triage: removed
P0: criticalbecause, unlike the repo's other P0 spec-drift issues (which describe complete request failures or fully broken data), this one's impact isside/actionbecomingnull/undefinedon fills — a data-completeness gap affecting P&L/trade-direction display, not a crash or full outage. AddedP1: highinstead (breaking API change needed, but not production-down).Generated by Claude Code
realfishsam commentedon Sep 4, 2026
Closing as duplicate of #514. Same underlying finding: Kalshi's
outcome_side/book_sidefield migration replacing legacy direction-style fields on the Order/Fill/Trade family incore/specs/kalshi/Kalshi.yaml. The Fill-specific detail from this issue (deprecatedside/actionfields, May 14 2026 deadline) has been copied over to #514 as a comment so it isn't lost.Generated by Claude Code