Sphere

Sphere operates an AI-native compliance platform that automates indirect tax obligations — sales tax, VAT and GST — for companies selling across borders. The product covers four stages of the compliance lifecycle: monitoring indirect tax exposure by integrating with a customer's billing stack and payroll provider to flag registration thresholds; handling registrations with tax authorities through government portals; calculating and collecting tax at the point of transaction in invoices or at checkout; and submitting filings and remitting collected tax to the relevant authorities.

The company positions two elements as its core architecture. The first is a set of "local rails" — direct integrations into more than 100 tax authorities in the US and internationally, built over roughly 18 months in stealth — which the company says allow end-to-end automation without relying on networks of local service providers. The second is the Tax Review and Assessment Model (TRAM), a proprietary engine that continuously ingests statute law, regulations, administrative guidance, bulletins, case law and private letter rulings from official government sources across 100+ regions, monitors them for change, and reasons about how they apply to a given product and jurisdiction, producing determinations with citations. Determinations are reviewed by Sphere's internal tax experts before entering production; the company states 90% are approved automatically with a median review time under 10 seconds, after which approved rules are pushed to a deterministic execution engine.

Sphere frames its market thesis around the roughly $200T+ in goods and services crossing borders annually and the fragmentation created by 190+ sovereign tax regimes, arguing compliance is the remaining friction layer in global trade. Following the Series A, the company plans to extend TRAM beyond indirect tax into input tax, withholding tax, e-invoicing and tariffs to build what it describes as a full revenue-based compliance engine.

Founding story

Sphere was founded by Nicholas (Nick) Rudder, who serves as CEO. The company's About page frames its origin around the thesis that every major trade breakthrough — from sailing routes and containerization to SWIFT, HS codes and Stripe — removed a layer of complexity, and that compliance is the last unsolved layer; it places Sphere on that timeline at 2024, collapsing transaction costs by automating cross-border payment compliance. One secondary profile states the founders had prior experience at Deel and Capbase and that early design partners and customers included Replit and ElevenLabs, though this profile contains other details that conflict with primary sources.

Business model

B2B SaaS. Sphere sells a compliance platform to finance and accounting teams, plugging into existing billing and payroll systems and taking over registration, calculation, filing and remittance. The company publishes a pricing page and offers 24/7 Slack-based support staffed by tax experts; sales appear to run through a demo/"Let's Talk" motion.

Subscription software sold to companies with cross-border tax obligations. One secondary profile describes flat monthly fees per region; the company's own site directs prospects to a pricing page and a sales conversation rather than self-serve checkout.

Traction

Sphere reports average monthly revenue growth above 30% since emerging from stealth in December 2024, ~50 employees, 100+ tax authority integrations, and billions of dollars in transaction value processed. Publicly named customers include Lovable, Replit, Windsurf, Deel, ElevenLabs, HeyGen, Runway AI, Weaviate and Codeium. Ecosystem milestones include being one of three tax vendors globally with native Stripe Billing and Checkout integration and membership in the NetSuite SuiteCloud Developer Network.

Latest developments

The November 2025 Series A will fund expansion of TRAM beyond indirect tax into input tax, withholding tax, e-invoicing and tariffs, with the goal of becoming a full revenue-based compliance engine. The company is actively hiring, listing open roles via Ashby.