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Paid

DefunctYC S14

San Francisco, US · 2 employees · 9 known investors

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Paid provides an API that automates accounts receivable processes, allowing businesses to programmatically create, issue, and send invoices to customers while tracking payment status and reconciling accounts. The platform serves companies that want to integrate invoicing workflows into their existing systems with minimal setup time.

Also known as Theorem

Enterprise SoftwareFintechUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (S14)

RJRyan Jackson
Ryan JacksonFounderRyan Jackson is an MIT-trained engineer with prior experience in product management across fintech, SaaS, and platform technologies, including roles at acquired companies and larger organizations. He is founder of Paid, which provides an API for automating accounts receivable and invoicing workflows.

Investors · 9

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

How we know: the Y Combinator directory · Not right? Tell us

Avlok CapitalreportedLynnwood

How we know: Y Combinator's founder network · Not right? Tell us

EQT VenturesreportedLuxembourg · $2M – $50M

How we know: funding news · finance.yahoo.com · Not right? Tell us

Founder CollectivereportedCambridge

How we know: Y Combinator's founder network · Not right? Tell us

FUSEreportedBellevue · $1M – $10M

How we know: funding news · finance.yahoo.com · Not right? Tell us

GMO VenturePartnersreportedTokyo

How we know: Y Combinator's founder network · Not right? Tell us

Investo CapitalreportedAalborg · $30K – $3M

How we know: Y Combinator's founder network · Not right? Tell us

Pear VCreportedSan Francisco · $150K – $4M

How we know: Y Combinator's founder network · Not right? Tell us

Funding

SEC filings, press & company announcements

$21M disclosed across 1 round · 2025

Source: company announcements and press reports — follow each round's link for the claim.

Related companies · 5

Payment LabsPayment Labs provides a platform for making fast, compliant global payments to athletes, creators, freelancers, and contractors, handling tax withholding and regulatory compliance across 180+ countries and 150+ currencies. It serves organizations paying student athletes (including NIL, scholarships, and stipends under NCAA rules), as well as those managing prize payouts and royalty splits.
Pine LabsPin Labs provides payment and financial technology products and solutions for businesses, including developer tools for integration.
BluebookBluebook provides AI agents that handle research, reconciliations, and month-end closing work for accounting firms, enabling each professional to manage a significantly larger client base and freeing time for strategic advisory work.
Swipe TechnologiesSwipe Technologies operates Float, a cross-border business payment platform, and Accounteer, a cloud-based accounting and bookkeeping service for companies and independent professionals.
ModernbancModernbanc provides accounting software that helps businesses manage their finances through an accessible and configurable platform.

Companies working in the same space as Paid.

Frequently asked questions

What does Paid do?
Paid provides an API that automates accounts receivable processes, allowing businesses to programmatically create, issue, and send invoices to customers while tracking payment status and reconciling accounts. The platform serves companies that want to integrate invoicing workflows into their existing systems with minimal setup time.
Who founded Paid?
Paid was founded by Ryan Jackson.
Who are Paid's investors?
Paid's investors include Lightspeed Venture Partners, Y Combinator, Avlok Capital, EQT Ventures, Founder Collective, FUSE, GMO VenturePartners, Investo Capital and 1 more.
How much funding has Paid raised?
Paid has disclosed $21M raised across 1 round.
Where is Paid headquartered?
Paid is headquartered in San Francisco, US.