Unified APIs as two-sided marketplaces

The hard part in unified APIs is not writing connectors, it is lining up both sides of the network at the same time. The company has to persuade providers to expose data and workflows, while also bringing in enough apps that providers see real demand. That is why distribution and partnerships matter as much as SDK quality. Once the network is working, the API layer can become the default route for an entire sector’s data and transactions.

• Finch describes this concretely in employment. It won provider relationships by showing that it already supported 8,000 employers on platforms like ADP and Gusto, which turned an abstract integration request into visible usage from shared customers. That is classic marketplace cold start logic, demand first, then deeper supply cooperation.
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• Plaid followed the same pattern in banking. Its network now spans thousands of apps and institutions, and the company has increasingly formalized direct bank partnerships and API based access. That makes the product more reliable, but it also makes Plaid harder to displace because banks and apps are both plugged into the same routing layer.
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• The best comparison is between vertical players like Finch and broader ones like Merge. Merge can cover many software categories through one integration surface, but vertical specialists can justify deeper provider relationships because they unlock specific workflows, like payroll deductions or employment verification, that matter enough for providers to support directly.
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This category is heading toward fewer pure connector businesses and more network businesses with value added products on top. As providers open up, the winning unified APIs will use their position between both sides to launch higher value services, like payments, verification, fraud, or workflow automation, and turn distribution into durable leverage.