OneKey
DefunctYC S20Paris, FR · Founded 2021 · 3 employees · 6 known investors
OneKey helps site developers and operators identify optimal locations for building electric vehicle charging stations based on profitability analysis.
Also known as Tippi · Uni
Founders & leadership· Y Combinator alumni (S20)
OneKey was founded in 2021 by Christophe Barre and Ulysse Prygiel.
Investors · 6
Also in the syndicate · 1
Funding
SEC filings, press & company announcements- Undisclosed amountSeries BApr 2026
YZi Labs (lead), Coinbase Ventures, Dragonfly, Ribbit Capital
Source ↗
Source: company announcements and press reports — follow each round's link for the claim.
Company profile
researched Aug 2026OneKey (getonekey.io) was a French company that provided site-selection analysis for electric vehicle charging infrastructure, positioning its product as a way to find the most profitable locations at which to build EV charging stations [3]. Its Y Combinator company listing categorises it under energy storage and electric vehicles [3].
The company was founded in 2021, was based in Paris, France, and participated in Y Combinator's Summer 2020 batch with a team size of three [3]. Y Combinator lists Christophe Barre and Ulysse Prygiel as former founders, with Barre subsequently described as Founder & CEO of Tandem [3]. The company's status on that listing is Inactive, and its former domain getonekey.io now resolves to unrelated Vietnamese-language sports-odds content rather than any EV-related product [0][2][3].
Traction
The only quantitative datapoint available is a team size of three reported on the Y Combinator company page [3]. No customer, revenue or usage figures are disclosed in the sources.
Latest developments
The Y Combinator company page lists OneKey's status as Inactive and refers to Christophe Barre and Ulysse Prygiel as former founders, with Barre listed as Founder & CEO of Tandem [3]. The getonekey.io domain, including its /privacy path, now serves unrelated Vietnamese-language football-odds content, indicating the original site is no longer operating [0][2].
▸Full profile — market position, technology, go-to-market, geography, risks & controversies
Market position
Y Combinator classifies the company within the energy storage and electric vehicles categories; no market share, ranking or comparative data is available in the sources [3].
Technology
Sources describe the offering only at the level of identifying the most profitable sites for EV charging stations; no technical detail on data sources, models or platform architecture is available [3].
Go-to-market
Site developers and operators considering where to build electric vehicle charging stations, implied by the product positioning of finding the most profitable sites for such stations [3].
Geography
Headquartered in Paris, France [3]. No other locations or markets are documented in the sources.
Risks & controversies
Public information on the company is minimal and largely limited to a single Y Combinator listing; the former company domain has been repurposed for unrelated content, and several sources bearing the OneKey name refer to different companies entirely (a Hong Kong crypto hardware wallet maker, an Italian marketing firm and a US entity in a patent database), creating a substantial risk of data conflation [0][2][4][5][6][7].
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Timeline · 2
launches, deals, and filingsY Combinator's company page for OneKey shows its status as Inactive and lists Christophe Barre and Ulysse Prygiel under 'Former Founders'. No date for the wind-down is given in the source.
OneKey is listed as part of Y Combinator's Summer 2020 batch on its YC company page.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
In the news
▸Research sources · 8
primary sources listed
- OneKeygetonekey.io · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does OneKey do?
- Paris-based Y Combinator company that helped identify the most profitable sites for building EV charging stations; now inactive.
- Who founded OneKey?
- OneKey was founded by Christophe Barre, Ulysse Prygiel in 2021.
- Who are OneKey's investors?
- OneKey's investors include IOSG Ventures, Y Combinator, Coinbase Ventures, Dragonfly, Ribbit Capital.
- Where is OneKey headquartered?
- OneKey is headquartered in Paris, FR.