Collateral split into outcome tokens on Polymarket.
Emitted when collateral (USDC) is split into outcome tokens (YES/NO shares) via the Conditional Tokens Framework splitPosition function.99%+ of splits happen as part of trade execution. This event provides supplementary data: how much collateral was split and into which market condition.
{ "data": { "amount": 5.190306, "block_number": 84090704, "collateral_token": "0x2791bca1f2de4661ed88a30c99a7a9449aa84174", "condition_id": "0xab3eea0d5b61cd443affca5fcd19d3541e92f7c96f7e92111982fbcbff56bb55", "event_title": "Bitcoin Up or Down - March 12, 3:40AM-3:45AM ET", "event_type": "position_split", "log_index": 763, "market_image": "https://polymarket-upload.s3.us-east-2.amazonaws.com/BTC+fullsize.png", "market_slug": "btc-updown-5m-1773301200", "market_title": "Bitcoin Up or Down - March 12, 3:40AM-3:45AM ET", "neg_risk": false, "stakeholder": "0x4bfb41d5b3570defd03c39a9a4d8de6bd8b8982e", "taker_base_fee": 1000.0, "tick_size": 0.01, "timestamp": 1773301441000, "tokens": { "47635040450827094965464370243227927750353541381049355332417378831540287352201": "Up", "57924371746740845060329991315866785058480643549619724503463886953768356812176": "Down" }, "tx_hash": "0x74dbde22f31ce8dcbc5b3c187c33cd131d9bb5791874e139b41c1049ae3589fc" }, "timestamp": 1773301441000, "type": "position_split"}
Collateral token address. USDC.e (0x2791bca1f2de4661ed88a30c99a7a9449aa84174) for standard markets, wrapped collateral (0x3a3bd7bb...) for neg_risk markets.
Taker fee rate in basis points. 200 = 2%, 1000 = 10%, null = no fee. Short-term crypto markets (5-minute ETH/BTC) typically have 1000 (10%), while standard markets have 200 (2%). Enriched from Polymarket metadata.
Collateral flow analysis — track how much USDC is being converted into outcome tokens
Market liquidity creation — splits indicate new shares being minted for a market
Trade enrichment — pair with trade events to see the full lifecycle of a trade (split → fill)
Not included in global firehose (full data stream) by default due to high volume (splits fire on most trades). Subscribe explicitly with event_types: ["position_split"] or use the wallets/markets subscription types which include it automatically.
