Addition
Addition is a New York City-based venture capital firm founded in 2020 by Lee Fixel, the former head of Tiger Global Management's private equity business. The firm invests in founder-led, technology-enabled companies across multiple stages, allocating roughly one-third of its capital to early-stage investments and the remainder to growth-stage opportunities. Sectors of focus include software and SaaS, fintech and payments, artificial intelligence and machine learning, developer tools and infrastructure, cybersecurity, consumer, logistics, and clean energy. Typical checks range from about $10M to $200M, with a reported sweet spot near $30M-$50M. Addition operates a streamlined solo-GP model with Fixel as sole managing partner making final investment decisions, enabling fast conviction. Across Addition One through Addition Five (2020-2023) the firm raised roughly $7B-$7.3B in committed capital. Notable investments include Stripe, Snyk, Hugging Face, Chainalysis, Navan, dLocal, Delhivery, Airwallex, Freshworks, Warby Parker, and Lyra Health.
Addition is tracked in the API Evangelist network. This page is the human-readable profile that sits on top of the machine-readable index we maintain at apis.io.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Addition is in the network as a tracked entity. We haven't yet indexed a public API surface for it — when one is published, the artifacts, score, and agent-readiness read will appear here automatically. The source repository is where that profile is built.
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