Slow Ventures
Slow Ventures is a generalist early-stage venture capital firm founded in 2011 and headquartered in San Francisco, with additional offices in Boston and New York. The firm leads pre-seed and seed rounds, writing typical checks of roughly $500K to $3M (averaging around $1.75M), and explicitly rejects thematic investing in favor of backing experienced founders with deep, hard-won domain expertise and genuine conviction. Slow's thesis funds rapid, high-stakes experimentation: capital that tests a novel risk or hypothesis whose validation dramatically increases a company's value and that cannot easily be funded another way. As a generalist, Slow invests across consumer and social, fintech, SaaS and enterprise/developer tools, healthcare, crypto/web3, the creator economy, and real-world operations (SMB acceleration, buyouts/rollups, franchising). The firm runs a dedicated Creator Fund backing creator-led businesses, and has deployed roughly $800M+ across multiple fund vintages since inception. Notable investments include Pinterest, Slack, Robinhood, Nextdoor, Postmates, Opendoor, Wealthfront, Casper, PillPack, Airtable, Gusto, and Solana.
Slow Ventures has 143 portfolio companies tracked on the APIs.io network, of which 143 (100%) publish APIs indexed here.
Its highest-rated API providers on the network are simondata, slack, giphy, amplitude, nationbuilder.
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.
Developing 15 Usable, with meaningful gaps to close
Thin 17 Limited public surface area
Emerging 23 Early or largely undocumented
Minimal 81 Almost no public developer surface
Unrated 3 Not yet scored
Properties
Portfolio
Where the firm publishes its investments
Firm
The firm itself
Cohort brief
Auto-generatedThe 140 portfolio companies with APIs in the catalog, backed by Slow Ventures, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Governance | 3.4 | 6.4 | -3 | 140 |
| Operational Transparency | 7.7 | 11.3 | -3.6 | 140 |
| Contract Quality | 12.7 | 17.5 | -4.8 | 140 |
| Developer Ergonomics | 12.3 | 17.9 | -5.6 | 140 |
| Discoverability | 54 | 60.4 | -6.4 | 140 |
| Access Clarity | 15.9 | 22.3 | -6.4 | 140 |
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) | 15% | 16% | -1 |
| MCP server (first-party) | 4% | 7% | -3 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 9% | 9% | 0 |
| Security | 74% | 88% | -14 |
| Arazzo workflows | 2% | 2% | 0 |
| Governance rules | 5% | 13% | -8 |
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 Simon Data 67
- 2 Slack 62.3
- 3 Amplitude 57.1
- 4 NationBuilder 53.7
- 5 FullContact 52.3
- 6 Button 52.3
- 7 Giphy 51.4
- 8 evernote 50
- 9 Shippo 49.1
- 10 Mattermark 48.2
- 1 Simon Data 49
- 2 Visa 41.7
- 3 handy 36.9
- 4 NationBuilder 35.8
- 5 Pinterest 33.8
- 6 Amplitude 32.9
- 7 silvercar 32.4
- 8 FullContact 31.3
- 9 Robinhood 30.7
- 10 Slack 29.4
Source (apis.yml)
Work with this as data
Every firm here is available over the APIs.io API and to AI agents over MCP.