Start building with Sail.

Learn more about what Sail does, or pick up where you left off.

GET /users/usr_abc123/expenses/exp_9f2c200 OK

{
  "id": "exp_9f2c",
  "name": "Digital Thermometer",
  "amount": 21.30,
  "status": "eligible",
  "merchant": { "name": "Walgreens" },
  "enrichment": { "category": "Medical devices" },
  "parent_expense_id": "exp_1b7d"
}

See the Get Expense endpoint

First time here?

Sail gets data and actions from financial systems that don't offer an API. It turns a purchase into the products inside it, tells you which ones qualify as healthcare expenses, and can reimburse an end user from their HSA/FSA.

Itemize Transaction API

Break a transaction down into the individual products inside it, each with its price and category.

Get started

Connect HSA/FSA API

Connect an end user's HSA/FSA to read their balance and activity, and to reimburse them from the account.

Get started

Classify Expense API

Check which transactions and products are eligible for HSA/FSA, using a published ruleset such as IRS Publication 502.

Get started

Set up the Sail MCP server

Connect your AI assistant to Sail's API reference with our MCP server for real-time, accurate answers about any Sail API endpoint.

Set up your AI assistant

Already building?

Jump straight to reference material.

Authentication API Errors Webhook Events Rate Limits

200Merchant details.

defaultStandard error envelope covering 400, 401, 403, 404, 429, and 500.