Kleiner Perkins has 230 portfolio companies tracked on APIs.io. 87 of them, 38%, publish APIs indexed here. The book’s portfolio rating is 33.5, thin, which ranks it 47th of the 108 funds on the network. The best companies in the book are very strong. What holds the rating down is everything below them, and the majority that publish nothing at all.
The top of the book
| Company | Kin Score | Agent Readiness |
|---|---|---|
| Anthropic | 77.9 | agent-ready |
| DoorDash | 76.2 | agent-ready |
| Arcade | 73.3 | agent-aware |
| Instacart | 71.5 | agent-ready |
| DocuSign | 69.8 | agent-ready |
| Fal | 68.6 | agent-ready |
| Profound | 66.7 | agent-ready |
| Parallel | 66.6 | agent-ready |
Those are the eight exemplars. Eight more score strong, led by Figma at 60.5, and 30 score developing. Five of the eight exemplars are AI-era bets (Anthropic, Arcade, Fal, Profound and Parallel), and Parallel also leads the portfolio on agent readiness at 65.0. The recent part of the book is being built API-first.
The rest of the book
The other 143 companies are on the network as profiles without a published API. Some of that is simply how old the fund is. Kleiner was founded in 1972, and Macromedia, Dropcam, LifeLock and Livongo are on the roster. They have been acquired or absorbed and will never publish. They do not count toward the 33.5, which is computed over the 87 publishers, but they do count toward the fund’s profiled rating, which is 17.3 across all 205 scored companies.
Some of it is current, though. Waymo, Applied Intuition, OpenEvidence, Hippocratic AI and Rogo are all live companies with no API on the network, and each of them scores emerging. Among the 87 that do publish, 62 have exactly one API page. The fund’s surface is wide but shallow.
The cohort brief on the fund page shows the same picture from the other side. It covers 165 scored portfolio members, and it rates the book above the catalog on developer ergonomics (27.8 against 23.3) and contract quality (21.6 against 17.8). Twenty percent of the scored portfolio publishes an MCP server, against 15% catalog-wide, and 17% publish governance rules, against 13%. Security artifacts are the one place the book trails: 91% against 98%.
How it compares
Sequoia Capital has 116 companies on the network, 93 of them publishing, and rates 37.3. Coatue leads all funds at 40.7 on a much smaller book. Kleiner’s exemplars are not what puts it in the middle of the table. The long tail does: 41 of its 87 publishers score thin, emerging or minimal.
Takeaway
The number that would move most is the 143. Every portfolio company that published even one documented API would add to a book whose best members already set the pace for the agent era. See the full portfolio, bands and cohort brief at apis.io/vcs/kleiner-perkins/.