Heavybit
Heavybit is a venture capital firm, founded in 2013, that invests from the earliest stages in enterprise infrastructure and developer tooling: software tools for engineering teams, AI, cloud-native infrastructure, open source, DevOps and DevSecOps. It writes $500K to $10M checks from pre-seed to Series A, says it is happy to lead the first day-0 check, and has launched 80+ startups with founders in 15 countries and 47 cities. Founders are supported by a community of 1,000+ domain advisors, the DevGuild event series, a library and podcast network, and the DevToolsDigest newsletter. Portfolio includes Stripe, PagerDuty (IPO), Snyk, Netlify, LaunchDarkly, CircleCI, Tailscale, Apollo GraphQL, ReadMe, Contentful, Mux and Replicate.
Heavybit has 78 portfolio companies tracked on the APIs.io network, of which 56 (72%) publish APIs indexed here. The remaining 17 are tracked as profiles without a published API on the network.
Its highest-rated API providers on the network are LaunchDarkly, Stripe, Snyk, Treasure Data, CircleCI.
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 9 Complete, well-documented, and agent-ready
Strong 7 Solid coverage with minor gaps
Developing 19 Usable, with meaningful gaps to close
Thin 10 Limited public surface area
Rest of Portfolio
5 further portfolio companies that don’t yet have a provider page on the network.
Scroll for all 5
Properties
Portfolio
Where the firm publishes its investments
Content
Blog, podcast, newsletter, and research
Cohort brief
Auto-generatedThe 73 portfolio companies with APIs in the catalog, backed by Heavybit, 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 | 43.2 | 26.5 | +16.7 | 73 |
| Operational Transparency | 28.6 | 13.2 | +15.4 | 73 |
| Developer Ergonomics | 39.1 | 23.8 | +15.3 | 73 |
| Contract Quality | 29.9 | 17.7 | +12.2 | 73 |
| Contract Governance | 12.3 | 7 | +5.3 | 73 |
| Discoverability | 58.1 | 58 | +0.1 | 73 |
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) | 23% | 15% | +8 |
| MCP server (first-party) | 25% | 13% | +12 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 12% | 12% | 0 |
| Security | 93% | 98% | -5 |
| Arazzo workflows | 7% | 2% | +5 |
| Governance rules | 47% | 18% | +29 |
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 LaunchDarkly
- 2 Stripe
- 3 Snyk
- 4 Treasure Data
- 5 CircleCI
- 6 Mux
- 7 Netlify
- 8 Replicated
- 9 Moesif
- 10 Groundcover
- 1 LaunchDarkly {"score" => 60.6, "band" => "agent-ready"}
- 2 Netlify {"score" => 58.8, "band" => "agent-ready"}
- 3 Stripe {"score" => 58.5, "band" => "agent-native"}
- 4 Contentful {"score" => 56.5, "band" => "agent-ready"}
- 5 CircleCI {"score" => 56.1, "band" => "agent-ready"}
- 6 Groundcover {"score" => 50, "band" => "agent-ready"}
- 7 Treasure Data {"score" => 49.9, "band" => "agent-native"}
- 8 Replicate {"score" => 49.8, "band" => "agent-ready"}
- 9 ReadMe {"score" => 48.9, "band" => "agent-ready"}
- 10 PagerDuty {"score" => 48.9, "band" => "agent-ready"}
Coverage caveat. 45 of 73 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 2 November 2026, across 37080 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.