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 42 (29%) publish APIs indexed here. The remaining 101 are tracked as profiles without a published API on the network.
Its highest-rated API providers on the network are slack, simondata, nationbuilder, giphy, amplitude.
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.
Strong 5 Solid coverage with minor gaps
Developing 15 Usable, with meaningful gaps to close
Thin 15 Limited public surface area
Unrated 1 Not yet scored
Properties
Portfolio
Where the firm publishes its investments
Firm
The firm itself
Cohort brief
Auto-generatedThe 96 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 Quality | 18.9 | 20.4 | -1.5 | 96 |
| Contract Governance | 3.5 | 6.6 | -3.1 | 96 |
| Operational Transparency | 11.3 | 14.4 | -3.1 | 96 |
| Discoverability | 57.7 | 61.5 | -3.8 | 96 |
| Access Clarity | 23 | 27.2 | -4.2 | 96 |
| Developer Ergonomics | 19.4 | 23.8 | -4.4 | 96 |
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) | 7% | 11% | -4 |
| MCP server (first-party) | 10% | 13% | -3 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 11% | 12% | -1 |
| Security | 90% | 96% | -6 |
| Arazzo workflows | 3% | 2% | +1 |
| Governance rules | 6% | 13% | -7 |
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 Slack 65.6
- 2 Simon Data 64
- 3 NationBuilder 61.6
- 4 Giphy 59.5
- 5 Amplitude 56.4
- 6 FullContact 53.3
- 7 Shippo 51.3
- 8 Pinterest 50.8
- 9 evernote 49.7
- 10 Button 49.2
- 1 Amplitude 54.3
- 2 Simon Data 49
- 3 Visa 46.4
- 4 Nextdoor 44.6
- 5 FullContact 36.5
- 6 NationBuilder 35.8
- 7 Pinterest 35.5
- 8 handy 34.7
- 9 Slack 34.4
- 10 TaskRabbit 33
Source (apis.yml)
Work with this as data
Every firm here is available over the APIs.io API and to AI agents over MCP.