When considering the creation of a flea market app, many people have questions such as “how should it be built?” and “how much will it cost?” In recent years, the barrier to development has decreased thanks to the spread of no-code tools. This article introduces the procedures, estimated expenses, and successful examples in Japan for developing a flea market platform.

What’s in this article?

• What is a flea market app?
  
• How to develop a flea market app
  
• Estimated development costs and timelines
  
• How to lower development costs
  
• The flow of flea market app development
  
• Core functions for a flea market app
  
• Key points for creating a successful flea market app
  
• Successful flea market apps
  
• How Stripe Connect can help
  

What is a flea market app?

Flea market apps allow individuals to buy and sell unwanted items online, much like at a physical market in a plaza or other venue.

Its defining feature is enabling individuals to act as vendors and easily exchange goods, making it a widely used consumer-to-consumer (C2C) ecommerce service.

How to develop a flea market app

Businesses build these platforms either entirely from the ground up or assemble them with no-code solutions. Functionality, project duration, and costs will vary depending on the route selected.

From-scratch development

From-scratch development is an approach in which an app’s code is designed and implemented from the ground up, without using existing packages or frameworks.

Constructing a platform from the ground up has the following characteristics:

• Capable of integrating complex, custom features
  
• The UI/UX can be fine-tuned to a very high degree
  
• Facilitates standing out among competing services
  

However, developing from scratch can be expensive and time-consuming, posing various challenges.

No-code development

No-code platforms enable the creation of applications with specialized tools, eliminating the need to write code. These solutions continue to evolve and are now equipped to manage complex, nuanced situations.

No-code development offers the following advantages:

• Maintains budget-friendly expenses
  
• Shortens the build timeline
  
• Supports building platforms with advanced capabilities
  

There’s a common misconception that no-code engineering leads to lower quality due to the absence of custom programming. In reality, it’s fully possible to create applications with advanced capabilities through such solutions.

Estimated development costs and timelines

The table below outlines the approximate cost and timeline for creating a flea market platform. Actual figures vary based on feature complexity and the chosen operating system:

How to lower development costs

The overall budget can be significantly reduced by adopting the following strategies:

Use no-code development

If you want to keep costs down for your secondhand marketplace, the first thing to consider is no-code development. In recent years, these platforms have made it possible to implement a wide array of capabilities, making high-quality applications without custom programming from the ground up. This choice also helps to greatly lower both expenses and production time.

Start small

Trying to cram in too many features at the beginning will skyrocket spending. Launching a flea market platform with just the core elements and gradually expanding based on user feedback ultimately minimizes waste.

Also, prioritize performance over polished visuals and elaborate UI elements. Keep costs in check by avoiding overengineered systems, excessive design layers, and feature bloat.

Make use of subsidies

The Japanese government offers a robust system of subsidies to support new ventures and IT adoption, such as the IT Introduction Subsidy and the Monozukuri Subsidy. Assuming you meet certain conditions, a portion of the development or system implementation costs will be eligible for subsidization.

Because program requirements and application statuses change each year, always review the most up-to-date information before proceeding. That said, making use of these subsidies can greatly reduce build spending. It is worthwhile to actively pursue support programs to minimize the initial investment as you develop your business.

The flow of flea market app development

The process for developing a flea market app varies depending on whether it’s created from the ground up or using no-code tools, and if it’s made in-house or outsourced. However, the overall flow remains the same, so let’s review the fundamental steps:

Decide on the direction for your flea market app

First, think about the specifics of the flea market app you wish to launch. Defining the broader elements—such as the target audience, what goods will be sold, and the service’s differentiation from competitors—simplifies and clarifies subsequent decisions.

Next, specify the primary features needed at launch: product listings, checkout process, payment handling, and account registration. At this stage, aim for basic functionality rather than perfection from the start.

Select the development method

Once the overall direction for the platform is set, you must decide on the development method. The process will differ depending on if you opt for no-code tools for a rapid rollout or prioritize uniqueness with a from-scratch custom build, and whether in-house resources or outsourcing is used.

Develop and test

Actual engineering will proceed according to the approach chosen. Once this stage concludes, conduct thorough testing before release to confirm that all the core functions—from product listing to checkout—work properly.

Release and refine improvements

When development and testing are complete, move forward with making the app available to the public. Post-launch, introduce enhancements based on usage data and feedback.

Core functions for a flea market app

To grasp the full picture of the features required for a flea market app, it helps to categorize them into three areas: tools for sellers and buyers to facilitate transactions, the shared infrastructure supporting the service, and operational or advanced capabilities to promote usage.

Features for sellers

These options allow sellers to register products and smoothly manage everything from sales to revenue tracking:

• Listing goods (photos, description, price)
  
• Modifying or removing listings
  
• Sales status
  
• Delivery methods
  
• Shipping notifications
  
• Sales revenue management
  
• Registering payment information
  

Features for buyers

These features help buyers find products and purchase them with confidence. Searchability and a simplified checkout experience have a strong impact on customer satisfaction. In addition to credit cards, offering popular Japanese payment methods, such as Konbini (convenience store) payments, installments, and PayPay, can also help prevent cart abandonment.

• Item search and categories/filters
  
• Detailed product view
  
• Saving favorites
  
• Purchasing functionality
  
• Checkout options
  
• Order history
  
• Shipment tracking
  

Common infrastructure

These are features that both sellers and buyers use:

• User registration/login
  
• Profile management
  
• Ratings
  
• Messages
  
• Notifications
  
• Inquiries/support
  
• Identity verification
  

Operations and expanded functions

While not necessary for the transaction itself, these functions help boost sales, improve retention rates, and enhance customer satisfaction:

• Email newsletters
  
• Push notifications
  
• Coupons
  
• Product and service restocks
  
• Recommendations
  

Key points for creating a successful flea market app

Here are some key points to remember to make your flea market app a success:

Don’t overdo it at the beginning

Adding excessive new functions and options immediately after rollout raises costs and might overwhelm users. At launch, keep the design simple and straightforward to understand, and release it as a minimum viable product (MVP). Then, gradually expand the offerings in response to feedback.

Create a trusted environment for secure transactions

Since secondhand marketplace platforms rely on peer-to-peer (P2P) transactions, the design must foster user trust and ensure a secure, reliable experience. Identity checks and messaging features help alleviate concerns in P2P exchanges.

The payment functionality is particularly important, as intuitive design, including fraud prevention measures and chargeback, determines the service stability. Focus on establishing a robust payment backbone so purchasers can pay with confidence and sellers receive their earnings reliably.

Additionally, marketplace-style apps might require revenue sharing with vendors and identity verification. Building such mechanisms in-house is a significant burden and not practical in most cases. One solution is to use payment services such as Stripe Connect, which can efficiently establish the infrastructure for payment processing and revenue distribution.

Encourage ongoing use

What determines the growth of a flea market platform is not just how many new users there are. It will also be necessary to devise ways to motivate current members to remain active on the service.

Some measures that can encourage repeat visits include sending sales updates, push alerts, special offers, and personalized recommendations. If the platform layout accounts for retention and lifetime value (LTV), it can help stabilize business operations.

Successful flea market apps

Let’s take a look at some flea market apps that have succeeded in Japan.

Mercari

Mercari is widely known as the country’s largest marketplace of its kind. The process from listing to checkout is straightforward, with an intuitive interface that guides users easily through each step.

They have also taken measures, such as introducing escrowed settlements, to ensure peace of mind for these P2P transactions.

Mercari recently announced adopting Stripe for their payment infrastructure as part of their plans to expand internationally. Stripe has helped establish systems to support cross-border exchanges, enabling acceptance of multiple currencies and a range of payment options from around the world.

SNKRDUNK

This is a specialty marketplace focusing on sneakers, trading cards, streetwear, luxury brand goods, and more.

Vendors send goods to a SNKRDUNK authentication center or bring them to a store, where items undergo verification for authenticity prior to shipment to purchasers. It is structured so that the platform acts as an intermediary to confirm legitimacy before delivery.

By withholding the seller’s address from the buyer, the service reinforces its commitment to safeguarding personal details. In markets that handle high-value goods, establishing a setting where transactions proceed smoothly fosters trust and sustains long-term growth.

Rakuten Rakuma

Rakuten Rakuma is a flea market app operated by the Rakuten Group. Its main strength lies in deep integration with the broader Rakuten ecosystem. By using Rakuten Points and promotional campaigns, they have successfully retained existing members. Its achievements are not due simply to product completeness—the fact that it’s part of the group strategy is also a contributing factor.

How Stripe Connect can help

Stripe Connect orchestrates money movement across multiple parties for software platforms and marketplaces. It offers quick onboarding, embedded components, global payouts, and more.

Connect can help you:

• Launch in weeks: Use Stripe-hosted or embedded functionality to go live faster, and avoid the up-front costs and development time usually required for payment facilitation.

• Manage payments at scale: Use tooling and services from Stripe so you don’t have to dedicate extra resources to margin reporting, tax forms, risk, global payment methods, or onboarding compliance.

• Grow globally: Help your users reach more customers worldwide with local payment methods and the ability to easily calculate sales tax, VAT, and GST.

• Build new lines of revenue: Optimize payment revenue by collecting fees on each transaction. Monetize Stripe’s capabilities by enabling in-person payments, instant payouts, sales tax collection, financing, expense cards, and more on your platform.

Learn more about Stripe Connect, or get started today.