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Documentation Index

Fetch the complete documentation index at: https://docs.getlemma.com/llms.txt

Use this file to discover all available pages before exploring further.

Webhooks let your platform receive HTTP callbacks when events occur in Lemma. Instead of polling our API, you register a URL and we send a POST request to it whenever a relevant event fires. To configure a webhook endpoint, contact the Lemma team with the URL you’d like to receive events at. We’re building a self-serve UI to manage endpoint URLs directly from the dashboard.

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Events

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provider.connected

Fired when a provider connects their Lemma account to your platform. This is the primary event for onboarding — use it to know when a new provider has authorized your API key to access their data. The payload includes the provider ID and basic details so you can immediately start pulling their accounts, transactions, and lockbox mail. 
{
  "event": "provider.connected",
  "provider": {
    "id": "entity_k7mXp2vR9nTfBw4s",
    "name": "Riverside Family Medicine",
    "structure": "professional_llc",
    "npi": "1234567890"
  },
  "occurred_at": "2026-03-15T14:30:00Z"
}
After receiving this event, you can call the Get provider, List provider accounts, and other provider-scoped endpoints using the provider.id from the payload.

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transaction.created

Fired when a new transaction posts to any account accessible to your API key. This includes incoming deposits (ACH, wire, check), outbound transfers, and internal movements between Lemma accounts. 
{
  "event": "transaction.created",
  "transaction": {
    "id": "transaction_Wp5mRx3nKv8bTh2d",
    "account_id": "account_Rv4nBt8xKw2pMh6s",
    "amount": 325000,
    "source": {
      "category": "check_deposit"
    },
    "counterparty": {
      "type": "external",
      "counterparty_id": "external_account_Bx5nTm8hKw3pVd7c",
      "counterparty_name": "Aetna Health Insurance"
    },
    "occurred_at": "2026-03-15T16:45:00Z"
  },
  "occurred_at": "2026-03-15T16:45:00Z"
}
Use this event to sync transactions in real time instead of polling the List transactions endpoint.