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The Slash API gives you programmatic access to the financial and operational workflows in your workspace.

Accounts and balances

Discover financial products, balances, and virtual accounts.

Cards and spend

Manage cards, spending controls, authorizations, and card activity.

Money movement

Create transfers, manage recipients, and follow payment lifecycles.

Operations

Automate invoices, expenses, approvals, and other back-office workflows.

Accounting and reconciliation

Read transaction activity and connect financial events to your accounting systems.

Webhooks

React to resource changes without polling every endpoint.
Treat the API Reference as the contract for request fields, response objects, and supported actions.

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Request basics

Every request uses https://api.slash.com, an X-API-Key header carrying a user API key, and an x-legal-entity header naming the legal entity to act on. JSON fields and query parameters use camelCase. Standard HTTP headers retain their documented hyphenated names. Resource ids are opaque. Store them and pass them back unchanged rather than inferring behavior from their prefixes.

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Build a reliable integration

Start with the quickstart, then use the concept and workflow guides for the part of the product you are integrating.