Rarible x LI.FI Crypto Payment API

LI.FI is a leading provider of cross-chain payment solutions, enabling seamless and flexible transactions across multiple blockchains. The Crypto Payment API was designed to address the growing need for simplified payment processes in decentralized applications (dApps).

The challenge was to develop an intuitive, user-friendly API that:

  • Supports cross-chain payments, allowing users to pay with any token on any blockchain.

  • Reduces transaction complexity while maintaining transparency and trust.

  • Ensures developers can easily integrate the API with minimal setup time.

Rarible x LI.FI Crypto Payment API

LI.FI is a leading provider of cross-chain payment solutions, enabling seamless and flexible transactions across multiple blockchains. The Crypto Payment API was designed to address the growing need for simplified payment processes in decentralized applications (dApps).

The challenge was to develop an intuitive, user-friendly API that:

  • Supports cross-chain payments, allowing users to pay with any token on any blockchain.

  • Reduces transaction complexity while maintaining transparency and trust.

  • Ensures developers can easily integrate the API with minimal setup time.

Outcome

The LI.FI Crypto Payment API delivered:

  • 25% faster integration times for developers using the API.

  • 40% reduction in payment processing errors across dApps.

  • Improved transaction success rates, with a 30% boost in user retention for dApp clients.

Key Stages

1. Research & Discovery

  • Interviewed developers and dApp users to uncover pain points, such as limited token compatibility, complex payment flows, and unclear fee structures.

  • Analyzed existing cross-chain payment workflows to identify bottlenecks and opportunities for optimization.

  • Defined key requirements for a flexible, modular API that caters to diverse dApp use cases.

2. Goals

  • Enable Cross-Chain Compatibility: Support payments across all major blockchains and tokens.

  • Streamline Integration: Provide an API that minimizes developer setup time and complexity.

  • Enhance Transparency: Display real-time fee breakdowns and transaction progress for end-users.

3. Wireframes & Prototyping

  • Designed end-to-end payment flows that visualize token swaps, fees, and confirmations in real-time.

  • Created developer-facing tools, including interactive API documentation and a sandbox environment for testing.

  • Iterated based on developer feedback to ensure intuitive integration and seamless user experience.

4. Visual Design & Prototyping

  • Developed a clean and modern UI/UX for end-user payment flows, focusing on clarity and ease of use.

  • Built modular components for fee estimations, transaction confirmations, and swap details.

  • Ensured compatibility with both desktop and mobile dApp interfaces.

5. Testing & Iteration

  • Conducted extensive testing with partner dApps to validate the API’s functionality across various blockchain environments.

  • Iterated on error handling and transaction fallback mechanisms to ensure reliability during high-volume use.

  • Improved developer tools based on feedback, adding pre-built templates and code examples.

Final Designs

The LI.FI Crypto Payment API delivers:

  • Cross-Chain Payments: Supports token swaps and payments across all major blockchains with real-time fee transparency.

  • Developer-Friendly Integration: Interactive documentation and pre-built templates reduce setup times.

  • User-Centric Features: Clear transaction flows, fee breakdowns, and progress tracking for an intuitive experience.

Impact

The Crypto Payment API transformed cross-chain payment workflows by:

  • Boosting Developer Productivity: Integration times reduced by 25%, enabling faster deployment of payment features.

  • Enhancing User Experience: Improved transaction success rates and reduced errors by 40%.

  • Increasing Adoption: Clients reported a 30% increase in user retention due to streamlined payment processes.

Learnings & Next Steps

Key Learning:

  • A focus on transparency and flexibility significantly reduces friction in complex blockchain workflows.

Next Steps:

  • Expand token and blockchain compatibility for broader adoption.

  • Introduce advanced analytics for developers to monitor payment performance.

  • Add support for recurring and subscription-based payment flows.

Black and white portrait of a man with a beard and glasses

Pablo Barrera

Lead/Senior Product Designer

Contact

Fill out the form, or reach out directly. I’ll respond within 24 hours.

© Copyright 2026. All rights Reserved.

Design by

Pablo Barrera

Black and white portrait of a man with a beard and glasses

Pablo Barrera

Lead/Senior Product Designer

Contact

Fill out the form, or reach out directly. I’ll respond within 24 hours.

© Copyright 2026. All rights Reserved.

Design by

Pablo Barrera

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