Sail
Sail API

One API for expense enrichment, eligibility classification, and HSA/FSA accounts.

Add item-level detail to transactions, get instant eligibility decisions, and read HSA/FSA balances and routing info, without building any of it from scratch.

Get started What Sail does
 // GET a classified expense
GET /v1/users/usr_abc123/expenses/exp_9f2c

→ 200 {
  “enrichment”: { “category”: “Pharmacies” },
  “section_213d_classification”: {
    “status”: “eligible”
  }
}

Build with AI on Sail

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

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Choose your integration

Three ways to use the Sail API. Pick the one that matches what you’re building. Each guide is self-contained.

Enrich transactions

Attach SKU and item-level detail to transaction data you already have.

Read the guide→

Classify transactions

Get an eligibility decision on transaction data you already have. No end-user surface needed.

Read the guide→

Connect HSA/FSA accounts

Let a user connect their HSA/FSA account and read its balance, transactions, and routing info.

Read the guide→

Already building?

Jump straight to reference material.

API Overview → API Authentication → Webhook Events →