Bullpen Capital
Bullpen Capital is a San Francisco-based venture capital firm founded in 2010 by Paul Martino, Duncan Davidson, and Richard Melmon that pioneered the "post-seed" investment category. The firm provides early-stage financing to companies that have found initial product-market fit but are overlooked by traditional investors "for no good reason" — deliberately backing unconventional founders and sectors that other firms dismiss. Bullpen typically writes checks in the range of roughly $1M-$5M, often stepping in between the seed and Series A rounds to help capital-efficient companies push toward a strong institutional raise. The firm invests across gaming, commerce, apps and services, health, consumer and lifestyle, fintech, and marketplaces, primarily in North America with select exposure in Latin America (notably Brazil and Mexico). With a portfolio of 90+ companies, Bullpen's notable investments include FanDuel, Namely, Classy, Braze, HomeLight, ipsy, SpotHero, Splitwise, and Wag.
Bullpen Capital has 92 portfolio companies tracked on the APIs.io network, of which 27 (29%) publish APIs indexed here. The remaining 65 are tracked as profiles without a published API on the network.
Its highest-rated API providers on the network are Braze, Improvado, Ocrolus, Windfall Data, PackageX.
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
Developing 8 Usable, with meaningful gaps to close
Thin 11 Limited public surface area
Emerging 5 Early or largely undocumented
Properties
Portfolio
Where the firm publishes its investments
Firm
The firm itself
Cohort brief
Auto-generatedThe 79 portfolio companies with APIs in the catalog, backed by Bullpen Capital, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Discoverability | 58.5 | 61.5 | -3 | 79 |
| Contract Governance | 3.6 | 6.6 | -3 | 79 |
| Access Clarity | 22.8 | 27.2 | -4.4 | 79 |
| Operational Transparency | 9.5 | 14.4 | -4.9 | 79 |
| Developer Ergonomics | 17.9 | 23.8 | -5.9 | 79 |
| Contract Quality | 14 | 20.4 | -6.4 | 79 |
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) | 6% | 11% | -5 |
| MCP server (first-party) | 9% | 13% | -4 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 6% | 12% | -6 |
| Security | 95% | 96% | -1 |
| Arazzo workflows | 2% | 2% | 0 |
| Governance rules | 2% | 13% | -11 |
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 Braze 81
- 2 Improvado 62.5
- 3 Ocrolus 57.7
- 4 Windfall Data 49
- 5 PackageX 48.1
- 6 Fama 45.4
- 7 Beyond Pricing 45.2
- 8 Confident Cannabis 43.6
- 9 Octane AI 43.6
- 10 LiveIntent 43
- 1 Braze 55.9
- 2 Improvado 53.2
- 3 Beyond Pricing 40.5
- 4 Ocrolus 38.7
- 5 SpotHero 35.9
- 6 Windfall Data 31.5
- 7 Tank Utility 31.5
- 8 Swish Analytics 31.5
- 9 LiveIntent 30.8
- 10 PackageX 30.4
Source (apis.yml)
Work with this as data
Every firm here is available over the APIs.io API and to AI agents over MCP.