Product Reports Resources Pricing Login Book a demo

SidelineSwap

eCommerce & Marketplaces · Boston, United States · Founded 2014

Connects athletes so they can buy, sell, and learn about new and used sports gear MoreLess

SidelineSwap operates as a specialized online marketplace catering to the sporting goods sector, facilitating consumer-to-consumer and business-to-consumer transactions of new and used sports equipment. The company was founded in 2012 by Brendan Candon and Anthony Piazza, former college athletes who identified a gap in the market for a dedicated platform for trading sports gear. Candon's background in finance and his experience as a lacrosse player, coupled with Piazza's expertise in software development, provided a solid foundation for the venture. They initially conceived the idea after realizing the amount of unused gear they and their teammates had accumulated.

The platform's business model is centered on a marketplace structure, connecting athletes, parents, and small sporting goods businesses. Revenue is generated through a commission-based system, where SidelineSwap takes a percentage of the final sale price from the seller. The fee is 12% for sellers on their first 0-5 sales, which decreases to 9% after the sixth sale, incentivizing active participation and volume selling on the platform. This model has proven effective, with the community growing to over 1.5 million athletes who have listed more than $1 billion worth of equipment since the marketplace officially launched in 2015.

SidelineSwap's value proposition lies in offering a wide selection of sporting goods at competitive prices, creating a circular economy that keeps equipment in use and out of landfills. The platform serves a dual purpose: it allows sellers to monetize underutilized assets and provides buyers with affordable access to quality gear. Key features include integrated shipping and payment processing, seller protection policies, and a community-driven content section that helps buyers make informed purchasing decisions. Based in Charlestown, Massachusetts, the company has successfully carved out a niche in the resale market by focusing exclusively on the sports community, fostering a user base with shared interests and expertise.

Keywords: online marketplace, sporting goods, peer-to-peer, resale market, commission-based, sports equipment, e-commerce, circular economy, used gear, consumer marketplace

Talent graph

SidelineSwap's talent

Book a demo to see the people
Team profiled 17 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 6 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Investors

13 investors on SidelineSwap's cap table

Sourced from Dealroom's funding history. Investor profile links are shown where available.

Seed 6 investors entered at this stage
MassChallenge
Global Founders Capital
Fullstack Sports Ventures
Nicolas Wittenborn
Maria Thomas
Teamworthy Ventures
Series A 7 investors entered at this stage
RiverPark Ventures
FJ Labs
PEAK6
Admiral Capital Group
Dick's Sporting Goods
eBay Ventures
DSG Ventures

Global footprint

Where SidelineSwap has talent and traffic

Workforce by country
4 countries with
team presence
🇺🇸 United States87.5%
🇨🇦 Canada8.3%
🇧🇷 Brazil2.1%
🇺🇦 Ukraine2.1%
4 countries shown

Market sentiment

What the market is saying about SidelineSwap

An AI-synthesized read of the highest-engagement posts about SidelineSwap on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

See SidelineSwap on the full Dealroom platform

Live deal flow, founder pedigree, hiring signals, revenue trajectory, and the full cap table.