Atomico
Atomico is a London-headquartered European venture capital firm founded in 2006 by Niklas Zennstrom, co-founder of Skype and Kazaa. Atomico partners with Europe's most ambitious technology founders from the earliest stages to pre-IPO across two dedicated teams: a Venture team that invests predominantly at Series A alongside occasional Seed opportunities, and a Growth team that invests from Series B to pre-IPO. In September 2024 the firm closed its largest ever fundraise, $1.24 billion across two funds - a $754M Atomico Growth VI vehicle and a $485M Atomico Venture VI vehicle - bringing total capital raised across seven funds to more than $5 billion. Growth-stage checks typically range from roughly $10M to $50M+. Atomico invests broadly across enterprise software, fintech, consumer, health, AI, developer tools, infrastructure, industrial and climate technology, with an explicit thesis that European technology has come of age. The firm operates offices in London, Paris, Berlin and Stockholm and is known for backing category-defining companies including Klarna, Stripe, Supercell, Graphcore, DeepL, Pipedrive, Truecaller, Wellhub, Lilium, Compass, Hinge Health and Sorare. Atomico also publishes the annual State of European Tech report, the definitive data-driven analysis of the European technology ecosystem.
Atomico has 35 portfolio companies tracked on the APIs.io network, of which 19 (54%) publish APIs indexed here. The remaining 16 are tracked as profiles without a published API on the network.
Its highest-rated API providers on the network are Stripe, Attentive, Klarna, Corti, Pipedrive.
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 10 Usable, with meaningful gaps to close
Properties
Portfolio
Where the firm publishes its investments
Firm
The firm itself
Cohort brief
Auto-generatedThe 34 portfolio companies with APIs in the catalog, backed by Atomico, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Operational Transparency | 24.6 | 13.6 | +11 | 34 |
| Access Clarity | 36.5 | 26.4 | +10.1 | 34 |
| Contract Quality | 26.7 | 17.6 | +9.1 | 34 |
| Developer Ergonomics | 30.2 | 23.1 | +7.1 | 34 |
| Contract Governance | 10.4 | 6.3 | +4.1 | 34 |
| Discoverability | 60.5 | 58.2 | +2.3 | 34 |
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) | 21% | 15% | +6 |
| MCP server (first-party) | 18% | 12% | +6 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 35% | 11% | +24 |
| Security | 100% | 98% | +2 |
| Arazzo workflows | 3% | 2% | +1 |
| Governance rules | 24% | 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.
Coverage caveat. 27 of 34 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.