Rebel Fund

Founded in 2019 and headquartered in San Francisco, Rebel Fund is a seed-stage venture capital firm that invests primarily in the United States. It focuses on education, training services, information technology, and healthcare sectors.

John Adler III

Partner

Jared Heyman

Managing Partner

Jonathan Hirsch

Partner

Daniel Kan

Partner

Richard F. Purcell

Investor

Richard Sussman

Founding Strategic Partner

Past deals in API

Sohar Health

Seed Round in 2025
Sohar Health is a technology company that provides an API-based platform for behavioral health organizations. Its key offerings include automated eligibility verification and AI-powered medical coding, aiming to streamline workflows, enhance patient intake, and boost revenue.

Circlemind

Seed Round in 2024
Circlemind is a technology company that specializes in advanced retrieval methods for knowledge graphs. It deploys open-source, agentic graph retrieval techniques, which are self-improving, multi-hop, and capable of handling dynamic data. These methods significantly enhance the capabilities of retrieval pipelines, outperforming traditional RAG systems. The company's expertise lies in vector databases and knowledge graphs, empowering users to build sophisticated retrieval pipelines using plain English.

Openmart

Seed Round in 2024
Openmart is an innovative company that operates an artificial intelligence-powered search engine aimed at assisting startups in identifying potential customers. By collecting business-to-business data from both public and private sources, Openmart enables companies to streamline their operations. Its AI agent automates critical tasks such as retailer follow-up check-ins and timely product reminders, fostering strong, ongoing relationships with retail partners. This approach allows business-to-business firms to concentrate on their core activities and prioritize revenue generation, ultimately enhancing their operational efficiency and market presence.

Pythagora

Seed Round in 2024
Pythagora is a technology company that specializes in developing tools for software developers. Its primary product is a platform that automates the creation of applications by engaging with users, streamlining the development process. Additionally, Pythagora offers test automation software, which generates tests from application programming interface (API) requests, reducing the need for manual test writing. This software captures API requests and restores server state during tests, allowing developers to concentrate on their core codebase.

Elyos Energy

Seed Round in 2023
Elyos Energy optimizes energy consumption in large commercial properties by connecting to smart thermostats, EVs, HVAC systems, solar panels, and batteries. Its platform enables real-time management of energy use across multiple sites, reducing consumption and facilitating participation in demand response markets.

Sohar Health

Seed Round in 2023
Sohar Health is a technology company that provides an API-based platform for behavioral health organizations. Its key offerings include automated eligibility verification and AI-powered medical coding, aiming to streamline workflows, enhance patient intake, and boost revenue.

JustPaid

Seed Round in 2023
JustPaid is a technology company based in Silicon Valley that offers a comprehensive platform for managing business payments and accounting. Its software automates the entire receivables lifecycle by organizing various types of contracts, including master service agreements and purchase orders, as well as emails and modifications. This centralized system allows organizations, regardless of size, to enhance cash flow management, streamline contract tracking, and facilitate payments, all with integrated blockchain technology. By simplifying and automating these financial processes, JustPaid enables businesses to save time and improve efficiency in their accounting tasks.

Scanbase

Seed Round in 2023
Scanbase is a company that focuses on enhancing the diagnostic journey for patients by developing innovative digital care planning and management tools. Its platform transforms traditional analog tests into digital workflows that integrate with application programming interfaces (APIs). This capability allows medical companies to analyze patient risk through photographs of rapid diagnostic tests and provide immediate results. By leveraging advanced computer vision technology, Scanbase aims to improve the efficiency and accuracy of at-home diagnostics, positioning itself as a leader in the evolving landscape of diagnostic medicine. The company is adaptable and responsive to unique situations, ensuring that it remains at the forefront of technological advancements in healthcare.

Axle Labs

Seed Round in 2023
Axle is an open platform that focuses on consumer-permissioned insurance data, enabling companies to verify insurance information and monitor ongoing coverage instantly. By securely linking policies, Axle aids businesses in creating a seamless experience for their customers while minimizing operational risks through improved decision-making. The platform's capabilities allow companies to manage insurance data efficiently, ensuring they are well-informed and can respond effectively to their clients' needs.

Invopop

Pre Seed Round in 2023
Invopop simplifies international invoicing for software companies. It offers an API that records sales, converts them into compliant invoices, and reports them to the appropriate tax authorities in the correct format.

JustPaid

Seed Round in 2023
JustPaid is a technology company based in Silicon Valley that offers a comprehensive platform for managing business payments and accounting. Its software automates the entire receivables lifecycle by organizing various types of contracts, including master service agreements and purchase orders, as well as emails and modifications. This centralized system allows organizations, regardless of size, to enhance cash flow management, streamline contract tracking, and facilitate payments, all with integrated blockchain technology. By simplifying and automating these financial processes, JustPaid enables businesses to save time and improve efficiency in their accounting tasks.

Infinia

Seed Round in 2023
Infinia is a payment platform that enables businesses and individuals to manage digital transactions securely and efficiently. The company specializes in providing account-to-account payment services that eliminate intermediaries, thereby reducing transaction fees and enhancing financial control. Infinia's open banking platform allows clients to integrate their e-commerce applications, facilitating seamless product and service payments while ensuring the protection of sensitive information. By offering a centralized solution for transaction management and reconciliation, Infinia streamlines the payment process, making it easier for users to make and receive payments directly from their bank accounts.

Fastgen

Seed Round in 2023
Fastgen is a low-code software company specializing in API and workflow builder platforms. Its flagship product features a user-friendly drag-and-drop interface, empowering developers to create backends and automations efficiently.

Koywe

Seed Round in 2023
Koywe is a technology company that specializes in providing payment APIs and SDKs designed for the integration of cryptocurrency into financial applications. Its offerings enable developers to create solutions for remittances, digital wallets, and investment services. By utilizing blockchain technology, Koywe facilitates the buying and selling of cryptocurrencies, allowing companies to seamlessly connect wallets and portfolios. The company focuses on delivering straightforward and well-documented tools that empower businesses to leverage cryptocurrencies effectively, thus enhancing their financial service capabilities.

Slauth.io

Seed Round in 2023
Slauth.io is an AI-driven tool that suggests secure Identity and Access Management (IAM) policies for microservices. It analyzes service identity activity to propose optimal policies via pull requests, saving DevOps engineers time and reducing security vulnerabilities.

AccessOwl

Seed Round in 2022
AccessOwl is a digital and cloud-based access governance management solution that automates provisioning and SaaS access control. It provides onboarding, compliance reporting, access requests, and workflow approvals, along with centralized app and user access management. The platform supports identity governance and administration to simplify SaaS management, automate onboarding and offboarding, and integrate with hundreds of tools, helping IT and security teams reduce costs, minimize risk, and maintain compliance.

Alephee

Seed Round in 2022
Alephee is a technology company that empowers brands to manage their online sales across multiple marketplaces such as Mercado Libre, Amazon, and Shopee. Its centralized platform connects brands with resellers, enabling them to share catalogs and inventory, increase sales, grow market share, and optimize logistics costs.

Peakflo

Seed Round in 2022
Peakflo is a SaaS platform that streamlines collections and payables for businesses in Southeast Asia. By offering a simple API and one‑click integration with accounting software, it automates back‑office workflows such as collections follow‑ups, procure‑to‑pay, invoice‑to‑cash, and expense management. The platform employs agentic workflows and AI voice agents to reduce manual effort, accelerate invoice payments by 10‑20 days, and cut vendor payment fees by 50‑90%. Finance teams across early‑stage startups to unicorns use Peakflo weekly to save time and improve cash flow.

PayCaddy

Seed Round in 2022
PayCaddy facilitates Latin American companies in launching financial services via an API-driven platform. It offers digital wallet creation with KYC checks, online payment processing, and issuance of personalized debit/prepaid cards for customers or employees.

Axle Health

Seed Round in 2021
Axle Health specializes in software for home healthcare providers. Its platform offers scheduling, workforce management, patient engagement, and logistics optimization tools. Integrated with various EMRs, Axle's customizable solutions improve clinical team utilization and automate operational tasks.

Axle Health

Seed Round in 2021
Axle Health specializes in software for home healthcare providers. Its platform offers scheduling, workforce management, patient engagement, and logistics optimization tools. Integrated with various EMRs, Axle's customizable solutions improve clinical team utilization and automate operational tasks.

Verifiable

Seed Round in 2020
Verifiable Inc. is a healthcare technology company that specializes in credential verification and compliance monitoring software. Founded in 2019, Verifiable is dedicated to streamlining the verification process by automating primary source verifications and providing real-time monitoring of licenses, sanctions, and other essential records. The company develops an API that connects healthcare providers with state and federal databases, allowing users to access a multitude of primary sources from a single platform. This integration enables healthcare organizations to enhance compliance, minimize risk, and maintain patient safety. By offering features such as automated notifications for potential issues and detailed audit logs, Verifiable aims to save time and resources for healthcare entities while ensuring adherence to regulatory standards. The company is headquartered in Austin, Texas.

Drapr

Seed Round in 2020
Drapr offers an online platform that enables users to create 3D avatars and virtually try on clothing, helping them find the best size and fit for their body type. The company supports e-commerce platforms like Salesforce and Shopify, catering to both men's and women's apparel. Based in Berkeley, California, Drapr aims to assist retailers in reducing returns by providing a more accurate shopping experience.

Fly.io

Seed Round in 2020
Fly.io is a company that provides an Application Delivery Network (ADN) designed to connect website owners with their customers effectively. Its platform allows users to build application servers using JavaScript, enabling them to write, test, and run code locally before deploying it. By utilizing a network of servers, Fly.io accepts visitor traffic, processes requests through middleware, and routes them to backend applications. This infrastructure allows website owners to direct their visitors securely and efficiently, ensuring that applications can scale and operate close to end users.

Airbyte

Seed Round in 2020
Airbyte is an open-source data integration platform that automates the movement of data from applications, APIs, and databases into data warehouses. It offers a library of pre-built connectors and allows custom connector development, enabling organizations to build end-to-end data pipelines quickly. The platform supports integration with over a thousand data sources and processes large volumes of data daily, helping businesses consolidate data for analytics and reporting. It is designed to be developer-friendly and scalable, facilitating real-time data synchronization and ensuring data consistency across systems.

Airbyte

Seed Round in 2020
Airbyte is an open-source data integration platform that automates the movement of data from applications, APIs, and databases into data warehouses. It offers a library of pre-built connectors and allows custom connector development, enabling organizations to build end-to-end data pipelines quickly. The platform supports integration with over a thousand data sources and processes large volumes of data daily, helping businesses consolidate data for analytics and reporting. It is designed to be developer-friendly and scalable, facilitating real-time data synchronization and ensuring data consistency across systems.
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