Uncork Capital
Uncork Capital is a San Francisco-based seed-stage venture capital firm founded in 2004 by Jeff Clavier, who formalized his angel portfolio into one of Silicon Valley's earliest dedicated seed funds; it operated as SoftTech VC until rebranding to Uncork Capital in 2017. Led by managing partners Jeff Clavier and Andy McLoughlin, the firm invests at the seed stage with a "first to believe" conviction style, typically targeting 10-15% ownership and writing seed checks broadly in the $1.5M-$4M range across B2B applications and SaaS, developer tooling, infrastructure and security, consumer and marketplaces, frontier tech/hardware, and AI/ML. In May 2025 the firm closed $300M in fresh capital across Uncork VIII (a $225M seed fund) and Uncork Plus IV (a $75M growth fund), bringing it to roughly $1.2B in assets under management. Across 275+ investments and 100+ outcomes, its portfolio and exits include SendGrid, Fitbit, Poshmark, Postmates, Eventbrite, LaunchDarkly, Tailscale, Front, Shippo, ClassDojo, Groq, Human Interest, Carrot Fertility, and GPTZero.
Uncork Capital has 174 portfolio companies tracked on the APIs.io network, of which 174 (100%) publish APIs indexed here.
Its highest-rated API providers on the network are SendGrid, LaunchDarkly, Bitly, UserGems, Vidyard.
Portfolio on the Network
Portfolio companies that publish APIs indexed on APIs.io, grouped by their API Evangelist rating. Exemplar and Strong are expanded by default.
Exemplar 6 Complete, well-documented, and agent-ready
Strong 4 Solid coverage with minor gaps
Developing 25 Usable, with meaningful gaps to close
Thin 22 Limited public surface area
Emerging 52 Early or largely undocumented
Minimal 65 Almost no public developer surface
Properties
Portfolio
Where the firm publishes its investments
Firm
The firm itself
Cohort brief
Auto-generatedThe 174 portfolio companies with APIs in the catalog, backed by Uncork Capital, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Access Clarity | 26 | 22.3 | +3.7 | 174 |
| Developer Ergonomics | 19.3 | 17.9 | +1.4 | 174 |
| Operational Transparency | 12 | 11.3 | +0.7 | 174 |
| Contract Governance | 6.3 | 6.4 | -0.1 | 174 |
| Discoverability | 60 | 60.4 | -0.4 | 174 |
| Contract Quality | 16.2 | 17.5 | -1.3 | 174 |
A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 20% | 16% | +4 |
| MCP server (first-party) | 12% | 7% | +5 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 10% | 9% | +1 |
| Security | 81% | 88% | -7 |
| Arazzo workflows | 1% | 2% | -1 |
| Governance rules | 9% | 13% | -4 |
mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.
- 1 SendGrid 77
- 2 UserGems 71.6
- 3 Vidyard 68.8
- 4 Bitly 68
- 5 Fitbit 67.6
- 6 Crossbeam 60.7
- 7 LiveRamp 59.1
- 8 MonetizeNow 58
- 9 VigLink (Sovrn Commerce) 56.1
- 10 GPTZero 55.8
- 1 MonetizeNow 58.6
- 2 Chariot 55.8
- 3 UserGems 54.7
- 4 Crossbeam 48.4
- 5 DocSend 47.1
- 6 Bitly 41.4
- 7 LiveRamp 41.4
- 8 SendGrid 41.2
- 9 VigLink (Sovrn Commerce) 39.4
- 10 Bem 39.2
Source (apis.yml)
Work with this as data
Every firm here is available over the APIs.io API and to AI agents over MCP.