Position mapping - OpenPX

An open position held by the caller. Every field is one of three entry types — direct (taken from upstream), synthetic (computed by OpenPX), or omitted (not exposed upstream).

Coverage

Exchange	Direct	Synthetic	Omitted
kalshi	2	3	0
polymarket	5	0	0

Field crosswalk

Unified field	Type	kalshi source	polymarket source	Notes
`market_ticker`	string	`MarketPosition.ticker`	`Position.slug`	kalshi: Kalshi market ticker; round-trips through `fetch_markets`. polymarket: Polymarket market slug; matches `Market.ticker`.
`outcome`	string	synthetic	`Position.outcome`	kalshi: Title-cased from the sign of `position_fp` (positive → `Yes`, negative → `No`). polymarket: Outcome label as published by Polymarket.
`size`	number (double)	`MarketPosition.position_fp`	`Position.size`	kalshi: Absolute value of the signed `position_fp` FixedPointCount string. polymarket: Non-negative size in contracts.
`average_price`	number (double)	synthetic	`Position.avgPrice`	kalshi: `total_traded_dollars / \|position_fp\|` — cost basis per contract. polymarket: Decimal probability in [0, 1].
`current_price`	number (double)	synthetic	`Position.curPrice`	kalshi: `market_exposure_dollars / \|position_fp\|` — mark per contract. polymarket: Decimal probability in [0, 1].

Source specs

kalshi · schema/upstream/kalshi.openapi.yaml
polymarket · schema/upstream/polymarket-data.openapi.yaml

Tables are auto-generated from schema/mappings/. CI fails if any direct ref no longer resolves in the cached upstream spec; the daily upstream-refresh PR surfaces drift here.