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.
Exemplar 1 Complete, well-documented, and agent-ready
Strong 5 Solid coverage with minor gaps
Developing 13 Usable, with meaningful gaps to close
Thin 15 Limited public surface area
Minimal 1 Almost no public developer surface
Properties
Portfolio
Where the firm publishes its investments
Firm
The firm itself
Cohort brief
Auto-generatedThe 104 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 | 14.8 | 17.6 | -2.8 | 104 |
| Contract Governance | 3.2 | 6.3 | -3.1 | 104 |
| Operational Transparency | 10.3 | 13.6 | -3.3 | 104 |
| Developer Ergonomics | 18 | 23.1 | -5.1 | 104 |
| Access Clarity | 21 | 26.4 | -5.4 | 104 |
| Discoverability | 51 | 58.2 | -7.2 | 104 |
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) | 13% | 15% | -2 |
| MCP server (first-party) | 10% | 12% | -2 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 13% | 11% | +2 |
| Security | 99% | 98% | +1 |
| Arazzo workflows | 3% | 2% | +1 |
| Governance rules | 7% | 13% | -6 |
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 68.4
- 2 Simon Data 66.3
- 3 NationBuilder 61.7
- 4 Giphy 59.8
- 5 Amplitude 57.8
- 6 FullContact 54.9
- 7 evernote 51.1
- 8 Button 50.5
- 9 Shippo 50.3
- 10 Pinterest 50
- 1 Amplitude 54
- 2 Simon Data 46.8
- 3 Visa 46.4
- 4 Nextdoor 44.6
- 5 FullContact 36.5
- 6 NationBuilder 35.8
- 7 Pinterest 35.5
- 8 Shippo 34.5
- 9 Slack 34
- 10 TaskRabbit 33
Coverage caveat. 93 of 104 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 3 October 2026, across 28834 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.
Source (apis.yml)
Work with this as data
Every firm here is available over the APIs.io API and to AI agents over MCP.