A view of two smartphones at the cattle and livestock market in the Lafiabougou district of Bamako, Mali. CGAP Photo (Nicolas Réméné via Communication for Development Ltd.) CGAP Photo (Nicolas Réméné via Communication for Development Ltd.)

Introduction to open APIs for digital finance

APIs in Digital Finance infographic
See this infographic for a quick overview of open APIs in digital finance.

Welcome to CGAP’s collection of tools and resources on open APIs. Digital financial services providers will find here information to help them decide whether open APIs make sense for their business and, if so, how to implement an open API strategy. Open APIs can unlock new revenue streams and customer bases for providers while catalyzing a robust, innovative digital finance ecosystem that benefits providers, third-party developers, and low-income customers. In this way, open APIs have great potential to advance financial inclusion. See answers to frequently asked questions below or explore our collection of resources to learn more about the business case for open APIs and how to implement an open APIs initiative.

Frequently asked questions

Digital Rails cover
Get a brief introduction to open APIs for
digital finance in this report.

An application programming interface (API) allows one software program to “talk” with another. APIs enable a wide range of innovative products and services that millions of people use every day. For instance, APIs are what make it possible for ride-hailing apps to leverage other companies’ mapping and payments systems. Sometimes companies create an API for a single or small number of partners.

When a financial services provider “opens” its APIs, it makes them widely available for other companies to consume. For example, a digital payments provider could open APIs to enable a whole range of e-commerce companies to plug seamlessly into its payments system. If done right, open APIs generate revenue for the provider and accelerate innovation in the marketplace.

APIs helped Eko increase agent networks 10x, reduce cost of agent acquisition 80%, drive up transaction volume 350%, and increase revenue 4x.

Open APIs can make it faster and cheaper for partners and other third parties to integrate your digital financial services into their new and existing products. As more third parties connect to your platform and the use cases for your services multiply, you can attract more users and generate new revenue streams.

In two years, open APIs enabled Indian fintech Eko to expand its distribution network from 15,000 to 150,000 agents, reduce the cost of agent acquisition by 80 percent, grow transaction volume by 350 percent, and increase revenue fourfold.

For a deeper look at Eko’s and other providers’ experiences with open APIs, see our videos, blogs, and case studies under “Business Case for Open APIs.”

Greta Bull, CGAP CEO, speaks about open APIs and financial inclusion
In this 3-minute video, CGAP CEO Greta Bull, former M-PESA
head Ron Webb, and other experts explain the connection
between open APIs and financial inclusion.

When digital financial services providers enable third parties to leverage their data and infrastructure via open APIs, it improves the economics of a range of business models and stimulates innovation in the digital finance ecosystem. This means greater choice for low-income customers through increased competition and new types of services. As former head of M-PESA Ron Webb said, “When APIs were difficult and there was a closed community of very few organizations making use of APIs with our organization, people had few choices. They could get loans only from two companies. With an open API platform, you can open that up in a marketplace to multiple lenders and customers then get a choice to go for the best deal that suits them.”

API strategy cover image
Get started with your open API strategy
by following the tips in this 4-page guide,
which includes more information about the
five steps listed here.

In the words of Cedric N’Guessan, group head of mobile financial services strategy and products at MTN: “Keep it simple.” You do not need a completely worked out API strategy at the outset. Start small, learn and iterate. Here are five actions that you can take early in your open API journey:

  1. Get management’s buy-in. Executives and managers should understand the potential of open APIs for your business.
  2. Appoint an API team. Your team should include a product manager and business, IT, and risk management leads.
  3. Learn from developers. Talk to third-party businesses and developers to understand which types of APIs would be most valuable for them.
  4. Build an inventory. Start with low-risk APIs, test them with a few partners, and iterate.
  5. Address technology challenges. Complete a technology gap analysis to determine the minimum requirements to open low-risk APIs to external third parties.
API pricing cover image
Learn how to devise an API pricing strategy
that balances your need to achieve a return
on investment with the needs of API users,
in this 12-page report.

A pricing strategy should aim to do the following:

  1. Help you achieve specific business objectives, such as growing revenue, reaching more customers, or increasing integrations
  2. Generate business value for the third parties using your APIs, whether standalone coders building new apps or enterprises looking to drive efficiency
  3. Align with (or modify) market expectations and norms for API pricing

Keep in mind that API pricing is more an art than a science. Make some assumptions and set a price, knowing that the price will likely change as you learn more and as the market develops.

Technology building blocks for open APIs cover image
This slide deck is designed to help business leaders who 
are not IT specialists to learn how to make informed
decisions about the technologies supporting open APIs.

Opening APIs is not just a technology project. It involves broader changes to your organization spanning your people, processes and ways of working. That said, the business leader responsible for a financial services provider’s API strategy does need to engage on key technology decisions. Lack of integration between business and technology strategy can lead to costly mistakes. Three design principles for an open API product should help to guide these decisions:

  1. Enable a self-service mindset. Your technology should make it easy for third parties to start using your APIs with as little support from your business as possible.
  2. Protect your reputation with third parties and end-customers. The technology must help address a range of risks, including those related to data privacy.
  3. Deliver an awesome third-party experience. Your success is tied to that of your partners. Make sure they like using your APIs so much that they advocate for your APIs.
Open APIs legal template cover image
Developed by law firm Hogan Lovells, this 
report offers guidance for providers on how
to mitigate risk with open APIs.

Common risks include unauthorized transactions on customer accounts and misuse or exposure of customer data. Rather than miss out on the opportunities presented by open APIs, digital financial services providers can mitigate these and other risks through a combination of technical, operational, and contractual measures.

Fair, standardized legal contracts can be used with third parties to identify risks, clarify responsibilities, and specify who is liable in different circumstances (as well as to speed up the onboarding process). This is a balancing act. Strict, one-sided contracts may assure providers, but too many restrictions may deter potential partners.


Engaging third parties with open APIs cover image
Learn about different third-party segments a provider may
want to target and strategies for engaging with them.

First, be clear about your business objectives and which third-party segments you are targeting with your open APIs. Second, make sure you understand the needs of those segments at each stage of their engagement with your APIs, from awareness of your offering to onboarding to usage. Third, develop resources and conduct activities to meet their different needs. For example, self-service and affordability tend to be priorities for independent coders and early-stage innovators; a well-designed developer portal would be critical for them. Large enterprises, on the other hand, may want a tailored value proposition and integration assistance. Lastly, be sure to track the flow of third parties that move from showing interest to actively using your APIs and get feedback so that you can iterate and improve your API offerings.