Harness Wealth API
No developer API. Harness builds and operates all integrations itself, including tax-data pipelines into CCH Axcess, GoSystem, Lacerte, and UltraTax. There is no portal, published reference, auth scheme, sandbox, or SDK; integration inquiries route to a partnerships email.
Frequently asked questions
Harness Wealth scores D on the API Report Card. No developer API. Harness builds and operates all integrations itself, including tax-data pipelines into CCH Axcess, GoSystem, Lacerte, and UltraTax. There is no portal, published reference, auth scheme, sandbox, or SDK; integration inquiries route to a partnerships email.
Without a usable official API, teams fall back on manual exports, file drops, or one-off vendor integrations. The other option is an unofficial API layer like Supergood that automates the authenticated web app directly.
Harness Wealth, now branded simply as 'Harness' at harness.co, with the original harnesswealth.com 301-redirecting to the new domain, is a New York-headquartered fintech founded in 2018 by David Snider (formerly COO/CFO at Compass) and Katie Prentke English.
Vertical: Financial Services, specifically the Accounting/Tax/Audit sub-vertical, with a tax-advisor matching marketplace bolted on top. High-earner consumer takes a short matching questionnaire on harness.co and is introduced to vetted tax and/or financial advisors with relevant equity-comp, founder-liquidity, or HNW expertise.
Mid-tier brand recognition within the tax/advisor-marketplace category, low recognition outside it.
Consumer matching profiles: income, equity comp (RSU/ISO/NSO grants and vesting), liquidity events, location, advisor preferences, contact info.
Founded in 2018; ~8 years old as of 2026.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.