- Embedding investing in your app does not require a broker-dealer license. The BaaS provider holds FINRA membership, net capital obligations, and clearing relationships. Your app operates under their umbrella through a written agreement.
- The real split is custody model: omnibus (all user assets held in one account at the clearing firm) versus fully disclosed (each end user gets an individual brokerage account). The model affects your tax reporting obligations, SIPC coverage clarity, and how you handle 1099s at scale.
- Alpaca and DriveWealth are the two most-referenced anchors in this space. Apex Clearing, Interactive Brokers, Vise, and a few others serve distinct segments from institutional RIAs to consumer apps.
- Pricing is not public for most providers. Expect revenue-share on payment for order flow, per-account fees, and sometimes a platform fee. Get unit economics in writing before signing.
- The compliance you own is disclosure: Form ADV or the equivalent, customer agreements, and your own KYC/AML layer. Build that alongside your API integration, not after launch.
The seven embedded investing and brokerage API providers most relevant for fintech builders today are Alpaca, DriveWealth, Apex Clearing, Interactive Brokers, Vise, Moment (formerly known as Apex Fintech Solutions’ developer product line), and Folio by Goldman Sachs. Each holds its own broker-dealer registration or clears through a registered entity, meaning your application embeds investing as an API integration, not a licensing process. The right choice depends on whether you need fractional shares, managed account rails, cash sweep, or institutional-grade clearing.
What Does “Embedded Investing API” Actually Mean?
An embedded investing API lets a non-brokerage app offer stock trading, fractional shares, ETF access, or managed portfolios without the app itself becoming a registered broker-dealer. The API provider sits between your application and the markets. They hold custody of assets, execute trades through a clearing firm, handle SIPC coverage, file 1099s, and maintain FINRA registration.
Your app is typically registered as an introducing broker or operates as an unregistered platform under the BaaS provider’s umbrella, depending on the provider’s model and the volume of activity. The distinction matters because introducing broker status comes with its own FINRA obligations, even if they are lighter than full broker-dealer membership. Most BaaS providers will walk you through which registration tier applies to your use case before you sign.
Three product models exist under the “embedded investing” umbrella, and conflating them leads to picking the wrong vendor. Self-directed brokerage gives end users control over individual stock and ETF trades. Managed accounts apply a model portfolio or algorithm and trade on the user’s behalf, which triggers investment adviser registration for whoever sets the strategy. Cash sweep moves idle balances into money market funds or bank deposits to earn yield, often the lightest lift from a compliance standpoint. Most providers handle at least two of these; few handle all three equally well.
For teams evaluating the broader embedded finance stack, the best embedded finance APIs for SaaS overview covers how investing sits alongside banking, lending, and insurance layers.
Do You Need a Broker-Dealer License to Embed Investing?
Almost certainly not, if you choose a BaaS provider correctly. The broker-dealer license, FINRA membership, and net capital requirements belong to the provider. Your application is the distribution layer.
What you do need: a customer agreement that discloses the relationship between your app, the introducing or carrying broker, and the clearing firm; an AML/KYC program that meets FINRA Rule 4370 and FinCEN requirements; and, if you are offering managed portfolios, either an investment adviser registration or a clear contractual structure that keeps the strategy decision with a registered adviser. The BaaS provider does not own your KYC process. That stays with you, though many providers offer integrated KYC tooling or work alongside vendors like Persona or Alloy.
The compliance framework your legal team should review before launch is described well in the Fintech Product and Compliance Readiness Checklist. The checklist is structured for pre-launch reviews, not post-launch patches.
The FintechSpecs Custody-Model Stress Test
Before comparing specific providers, every team should run what we call the FintechSpecs Custody-Model Stress Test: four questions that determine which provider architecture fits your product.
- Omnibus or fully disclosed? Omnibus means all your users’ assets sit in one account at the clearing firm, with your system tracking sub-balances. Fully disclosed means each user has an individual account at the broker. Fully disclosed is cleaner for SIPC coverage communication and 1099 issuance. Omnibus is simpler to build on but shifts reconciliation and tax reporting complexity to your engineering team.
- Who files the 1099? If the clearing firm files directly to the IRS per end-user account, your tax ops burden drops dramatically. If you operate omnibus, you or your provider files aggregate reports and you handle downstream 1099-B generation. Ask this question explicitly in vendor calls.
- What happens to cash between trades? Cash sweep arrangements, where idle cash earns yield in a money market fund or bank deposit program, generate revenue for the provider and sometimes a pass-through to your app. The terms of that sweep, including who earns the yield and whether it is disclosed to users, are a regulatory question under SEC guidance on uninvested cash.
- Can your users withdraw to an external bank account directly? This determines whether you need a separate banking layer (an ACH origination relationship or a BaaS banking partner) or whether the investing provider handles disbursements.
Run every provider on these four checks before evaluating features or pricing. The answers will eliminate at least two candidates immediately.
Which Embedded Investing API Is Best for Consumer Apps with Fractional Shares?
1. Alpaca
Alpaca is an SEC-registered broker-dealer and FINRA member that offers a REST API for stock and ETF trading, including fractional shares. As of their current public pricing page, the minimum fractional share order is $1. Their developer documentation is public, their sandbox environment is accessible without a sales call, and their API design follows patterns familiar to any engineering team that has worked with a modern payments API.
Alpaca’s model is fully disclosed, meaning each end user gets an individual brokerage account. They support both self-directed and algorithmic trading use cases. Their clearing is handled through Alpaca Securities LLC, their own broker-dealer subsidiary, which removes a layer of counterparty complexity relative to providers who rely on a third-party clearing firm.
Alpaca’s public documentation confirms commission-free trading on US equities and ETFs for US-based end users, with revenue generated through payment for order flow and other sources disclosed in their 606 reports. Pricing for the BaaS/embedded model is negotiated; Alpaca does not publish a public tier for platform partners as of their current website.
Alpaca is the strongest default for developer-first teams building consumer investing apps. The documentation quality and sandbox availability mean an engineering team can validate the integration before a commercial conversation starts.
2. DriveWealth
DriveWealth is a FINRA-registered broker-dealer and one of the most widely deployed embedded investing infrastructure providers globally. Their API supports fractional shares, real-time trading, and portfolio management. DriveWealth operates as the carrying broker, meaning they hold custody and clear trades themselves rather than passing to a third party.
DriveWealth’s fully disclosed account model means each end user has a registered brokerage account under their infrastructure. They handle SIPC coverage, 1099 filing, and regulatory reporting at the individual account level. This makes them operationally cleaner for high-volume consumer apps where tax reporting at scale is a real concern.
Their partner list is large. Cash App, Revolut, and SoFi have been identified as past or current DriveWealth partners in public company announcements and press releases over the years, which signals both scale capability and the maturity of their API. DriveWealth does not publish pricing publicly; fees are negotiated based on account volume and trading activity. Expect per-account fees, potential minimum volume commitments, and a revenue-share arrangement on order flow.
DriveWealth is the better choice over Alpaca when your product will operate internationally or when you need a provider with a documented track record at consumer scale. Their institutional relationships and clearing depth make them more suitable for Series B and later companies.
3. Apex Clearing
Apex Clearing is a self-clearing broker-dealer that serves as the custodian and clearing firm for a large portion of the fintech brokerage space. Unlike Alpaca and DriveWealth, Apex does not typically provide a retail-facing API product. They clear for introducing brokers, meaning your app would need to either become an introducing broker or work through a middleware layer.
Apex’s infrastructure underpins a significant portion of US retail fintech brokerage, including past relationships with Robinhood and others. Their clearing depth and operational maturity are their main advantages. The tradeoff is that integration complexity is higher, and the path to going live involves more legal and operational steps than a self-serve BaaS product.
Apex is most relevant for teams that are already registered introducing brokers or that plan to be, and who want to own more of the custody and clearing relationship directly. It is not the right starting point for a seed-stage team embedding investing for the first time.
Which Providers Serve RIA Infrastructure and Managed Accounts?
4. Vise
Vise targets registered investment advisers who want to automate portfolio management at the account level. Their platform handles trade generation, tax-loss harvesting, and rebalancing across thousands of individual client accounts. The underlying custody typically sits with an established custodian; Vise operates as the technology and strategy layer above custody.
This makes Vise a different category than Alpaca or DriveWealth. If your product is giving end users a robo-advisory or managed portfolio experience, Vise’s model is worth evaluating. If you are building self-directed trading, it is not the right fit. Vise does not publish pricing publicly.
5. Interactive Brokers (IBKR)
Interactive Brokers offers a formal API product for algorithmic and programmatic trading. Their IBKR APIs cover equities, options, futures, and FX, with both a legacy TWS API and a REST-based Client Portal API. For embedded investing purposes, IBKR’s prime brokerage and clearing services can support institutional and professional accounts at scale.
IBKR is less suited for consumer-facing embedded apps and more relevant for professional trading platforms, hedge fund infrastructure, or products targeting sophisticated investors. Their compliance posture and documentation assume a more technically and financially literate operator than a typical BaaS consumer product. Commission structures are publicly available on their website and vary by product and volume.
6. Folio by Goldman Sachs
Goldman Sachs acquired Folio Financial in 2020, integrating the Folio infrastructure into Goldman’s broader digital assets and wealth infrastructure stack. Folio pioneered folios (basket investing) and fractional shares at the institutional level. The resulting infrastructure is available to institutional partners and larger fintech programs.
Goldman Sachs does not operate Folio as a self-serve developer product. Access is through a partnership process suited for Series B companies or larger with demonstrated volume. The advantage is institutional-grade custody and the Goldman brand, which matters in certain B2B and wealth management contexts.
7. Moment
Moment is a brokerage-as-a-service platform built specifically for embedded investing in consumer and B2B apps. Their API supports equities, ETFs, fractional shares, and cash sweep products. Moment positions itself as a developer-first layer over cleared infrastructure, with pre-built compliance tooling and KYC integrations designed to reduce the time from API access to live users.
Moment is worth evaluating for teams at the seed-to-Series A stage that want a faster path to launch than DriveWealth’s enterprise sales cycle typically offers, but need more compliance scaffolding than Alpaca’s developer-first model provides. Pricing is not publicly disclosed.
How Do These Providers Compare on Core Criteria?
| Provider | Custody Model | Fractional Shares | Managed Accounts | Best Fit Stage | Public Pricing |
|---|---|---|---|---|---|
| Alpaca | Fully disclosed | Yes ($1 min) | Algorithmic only | Seed to Series B | No |
| DriveWealth | Fully disclosed | Yes | Via partners | Series A to enterprise | No |
| Apex Clearing | Fully disclosed (clearing) | Yes (via introducing broker) | Supported | Registered introducing brokers | No |
| Vise | Custodian-agnostic | N/A | Yes (core product) | Registered RIAs | No |
| Interactive Brokers | IBKR as custodian | Limited | Via prime brokerage | Professional / institutional | Partial (commissions public) |
| Folio / Goldman | Goldman as custodian | Yes | Yes | Series B+ / institutional | No |
| Moment | Cleared infrastructure | Yes | Supported | Seed to Series A | No |
What Does the Unit Economics Actually Look Like for an Embedded Investing App?
For illustration: consider a hypothetical Series A consumer fintech with 50,000 active investing accounts, each averaging $2,000 in assets under custody and four trades per month. At that scale, the cost structure looks roughly like this: the BaaS provider earns revenue through payment for order flow on executed trades, a spread on cash sweep, and potentially a per-account custody fee (common structures range from a few dollars to low double digits per account per year, though the specific figure is always negotiated). Your app’s revenue depends entirely on what you negotiate back: a share of PFOF, a pass-through on sweep yield, or a flat per-account revenue share.
The math that catches founders off guard is the tax operations cost. With 50,000 fully disclosed accounts, 1099-B generation and correction workflows in February and March become an engineering and ops priority, not a side project. Providers like DriveWealth that handle 1099 filing at the account level remove this burden. Omnibus arrangements push it back to you. That distinction is worth more than almost any API feature difference.
The hidden costs that kill fintech SaaS margins article covers how custody and clearing overheads show up in unit economics that look clean at the term sheet stage but deteriorate at 50,000 accounts.
How Does Embedded Investing Fit Into a Broader Embedded Finance Stack?
An investing feature rarely ships alone. The common build sequence is: banking first (FDIC-insured accounts for cash deposits), then payments (ACH for funding), then investing (equities and ETFs), then insurance or tax. Each layer has its own vendor and its own compliance surface. The investing layer specifically requires that your KYC process meets FINRA suitability standards, not just FinCEN AML requirements. That means collecting investment experience, risk tolerance, and financial information at onboarding, which most generic KYC providers do not handle out of the box.
If you are building the embedded finance suite in sequence, the best embedded payroll APIs for vertical SaaS covers the payroll layer, which frequently sits adjacent to investing in HR and benefits platforms. The disclosure frameworks overlap: both require clear disclosure of fees, relationships, and data use at the point of enrollment.
For teams evaluating what the complete infrastructure map looks like at each layer, the fintech infrastructure stack in 2026 provides a full taxonomy from core banking through to compliance tooling.
Frequently Asked Questions
Do I need a FINRA license to offer investing through my app?
Not necessarily. If you use a brokerage-as-a-service provider where the provider is the registered broker-dealer, your app can operate under their regulatory umbrella. You may need to register as an introducing broker, depending on the provider’s structure and your level of involvement in the account relationship. Your legal counsel should review FINRA Rule 1000 series requirements specific to your arrangement. Most BaaS providers will outline which registration tier applies during the onboarding process.
What is the difference between an omnibus and a fully disclosed account model?
In a fully disclosed model, each of your end users has an individual, named brokerage account at the clearing firm. SIPC coverage applies per account, and the clearing firm files 1099s directly. In an omnibus model, all user assets are pooled in one account at the clearing firm, with your system tracking individual balances. Omnibus simplifies the clearing relationship but transfers tax reporting complexity and some regulatory accountability to your platform. Most consumer-facing BaaS providers use fully disclosed models.
Which embedded investing API has the best developer experience?
Alpaca consistently receives high marks for developer experience. Their REST API documentation is publicly accessible, their sandbox environment is available without a sales engagement, and their API design follows standard patterns. DriveWealth has strong documentation but requires a commercial conversation before sandbox access at the full partner level. Moment positions developer experience as a primary differentiator for early-stage teams. Interactive Brokers’ API is well-documented but assumes institutional technical depth.
Does embedding investing require me to register as an investment adviser?
Only if your app provides investment advice or manages portfolios on behalf of users. Self-directed brokerage, where users make their own trade decisions, does not trigger investment adviser registration. Offering a managed portfolio, model-based allocation, or robo-advisory feature typically does. The RIA registration requirement falls on whoever sets the investment strategy, which could be your company or a sub-adviser you contract with. Most BaaS providers have clear guidance on this boundary.
Is there a free embedded brokerage API available?
Alpaca offers a free paper trading environment and sandbox for development purposes. Production access with real money and real accounts requires a commercial agreement. No provider offers a free production embedded investing API for commercial use; the cost structure is built into the provider’s revenue model through payment for order flow, cash sweep yield, and account fees. Treating sandbox access as equivalent to production pricing is a common early-stage mistake.
How does cash sweep work in an embedded investing context?
Cash sweep automatically moves uninvested balances from a user’s brokerage account into a money market fund or bank deposit program. The BaaS provider typically earns the spread between the yield paid to the user and the yield earned on the underlying instruments. Some providers pass a portion back to the platform as revenue share. SEC guidance on uninvested cash requires clear disclosure to end users about where their cash is held, the yield it earns, and any conflicts of interest in the sweep arrangement.
Can embedded investing APIs support international users?
DriveWealth has the most documented track record for international deployments, with partners operating in multiple countries outside the US. Alpaca supports international investors trading US securities, subject to applicable local regulations in the investor’s country. Regulatory complexity increases significantly for international investing because you face both US requirements and the investor’s home country rules. Any international launch should include local legal review in the target markets.
How to Shortlist Two Providers Before Your First Call
Start with the four questions from the Custody-Model Stress Test above. If you need fractional shares and international coverage, DriveWealth advances to the shortlist automatically. If you are US-only, developer-first, and pre-Series A, Alpaca belongs on it. If you are building a managed account or RIA-adjacent product, Vise replaces one of those two.
The next filter is your go-live timeline. Alpaca’s sandbox is accessible today. DriveWealth and Moment require a sales conversation before full API access. If your engineering team needs to validate the integration before a commercial commitment, that asymmetry matters more than any feature comparison.
The final filter is tax operations. Ask every provider on your shortlist: who files the 1099-B, on what timeline, and what correction workflow exists if an account has an error. The answer will immediately reveal how much of that burden lands on your team. Getting this wrong at 10,000 accounts is a regulatory and customer service problem simultaneously.
Investors and compliance officers reviewing your embedded finance stack will ask about your custody model and your disclosure framework before they ask about your API. Having clean answers to those two questions, grounded in your specific provider agreement, is what separates a fintech that ships investing from one that talks about it. The technology is the easier half of this build.
