Build on a regulated stack in minutes

Sandbox is public. Pricing is published. No sales call required.

Choose your integration path

Self-Directed Investing

Let your users buy and sell stocks, ETFs, and fractional shares. You control the UI — Buildmarkets handles accounts, KYC, custody, and order routing.Best for: Trading apps, invest tabs, stock gifting, round-ups.

Wealth Management

Power advisor-managed and robo-advisory accounts with API-driven portfolio construction and rebalancing. Full wealth lifecycle through the API.Best for: Robo-advisors, financial planner apps, employee benefits.

Explore the platform

Quick Start

Get your first API call working in under 10 minutes.

Platform Concepts

Understand accounts, balances, trading, and compliance.

Guides

Step-by-step integration guides for every workflow.

Webhooks

Real-time event notifications for account, trading, and funding activity.

FIX Gateway

FIX 4.4 order management for partners with their own OMS or algorithmic trading infrastructure.

Changelog

Latest API updates, new features, and deprecations.

Developer resources

Postman Collection

Pre-built requests for every endpoint.

Error Reference

Full catalog of error codes and troubleshooting.

AI-Assisted Development

Integrate with Claude Code, Cursor, or Windsurf.