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Event: trader_first_trade
Cost: 0.1 credits per delivery
The trader_first_trade event fires when a tracked trader executes their first-ever trade on Polymarket, delivering exactly once per trader for the lifetime of their account. The full payload schema is in the auto-generated Trader First Trade callback reference; this page documents the filters and matching behavior.

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When to use this

  • Onboard newly active wallets into a watchlist the moment they place their debut trade.
  • Detect fresh capital entering Polymarket before a trader builds any history.
  • Trigger welcome or attribution flows that should run once per trader, never on repeat trades.

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Subscription filters

Add these to the filters object when you create the subscription.
FilterTypeDescription
wallet_addressesstring[]Restrict to specific trader wallet addresses (max 500).
min_usd_valuenumberMinimum USD size of the trade.
min_probabilitynumberMinimum outcome probability, 0.0–1.0.
max_probabilitynumberMaximum outcome probability, 0.0–1.0.
condition_idsstring[]Restrict to specific markets by condition ID (max 500).
event_slugsstring[]Restrict to specific events by slug (max 500).
exclude_shortterm_marketsbooleanExclude short-term Up/Down markets.

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Example

{
  "url": "https://your-server.com/webhooks",
  "event": "trader_first_trade",
  "filters": {
    "min_usd_value": 100,
    "exclude_shortterm_markets": true
  }
}
Last modified on June 3, 2026