Venture Capital

Andreessen Horowitz

Andreessen Horowitz (a16z) is a Silicon Valley venture capital firm founded in July 2009 by Marc Andreessen and Ben Horowitz and headquartered in Menlo Park, California. The firm invests across the full lifecycle from seed to venture to growth-stage technology companies, deploying stage-based checks that range from roughly $1M-$5M into early application bets up to hundreds of millions of dollars into its largest AI positions. a16z organizes around dedicated practice areas: AI, American Dynamism, Bio + Healthcare, Consumer, Crypto, Enterprise, Fintech, Games, Infrastructure, plus specialty vehicles including the Cultural Leadership Fund, Perennial, and the Speedrun accelerator. With over $90B-$100B+ in assets under management as of early 2026 and a public portfolio of more than 1,000 companies, a16z is one of the largest and most influential venture firms in the world, known for its operator-led platform model and notable investments including Airbnb, Coinbase, GitHub, Figma, Stripe, Databricks, Anduril, and OpenAI.

1100 portfolio companies 1097 publish APIs here 15 properties
Venture CapitalSeedSeries AGrowth EquityArtificial IntelligenceCryptoFintechEnterpriseInfrastructureDeveloper ToolsAmerican DynamismSilicon ValleyNorth America
Portfolio Strength across 378 profiled portfolio companies on the network
62 top-rated API companies 23 exemplar · 39 strong
137 agent-ready companies 15 agent-native · 122 agent-ready
Average quality of the book:
Composite thin 39.4
Agent-Readiness agent-aware 24.3

Firms are ranked by cumulative portfolio strength — how many highly-rated API companies they've backed, weighted by tier across composite quality and agent-readiness. The averages below are a secondary read on the typical company in the book.

Andreessen Horowitz has 1,100 portfolio companies tracked on the APIs.io network, of which 380 (35%) publish APIs indexed here. The remaining 717 are tracked as profiles without a published API on the network.

Its highest-rated API providers on the network are Stripe, OpenAI, ElevenLabs, Svix, Optimizely.

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 23 Complete, well-documented, and agent-ready
Strong 39 Solid coverage with minor gaps
Developing 122 Usable, with meaningful gaps to close
Knownwell1 API54.2Eligible5 APIs54.1Resend1 API54.1Lighter1 API54.0Replicate1 API53.9Hex1 API53.8Basis1 API53.1Yuno1 API53.0Neon Commerce10 APIs52.9Payrails1 API52.7Thatch Health2 APIs52.2Biodock1 API51.6Mistral AI13 APIs51.6Avalanche2 APIs51.4Vitally9 APIs51.2Halliday1 API50.9Sprig1 API50.9Pinterest1 API50.8Uthana2 APIs50.7Clever2 APIs50.6Repl.it1 API50.5Workboard2 APIs50.5OpenSea1 API50.3Flock Safety1 API49.9Orderful1 API49.8Nym Technologies2 APIs49.7Anchorage2 APIs49.6Lightup1 API49.5Kodex2 APIs49.4Devoted Health3 APIs49.2Mintlify1 API49.1Prosper AI1 API48.7Reflektive1 API48.7Aghanim1 API48.5Hedra1 API48.5Dyno2 APIs48.3Lyft2 APIs48.2Rainforest QA1 API47.9Zencoder1 API47.9Trunk1 API47.7Merit Systems2 APIs47.4Pimlico2 APIs47.4Equals1 API47.3Tanium3 APIs47.3Unravel Data Systems1 API47.2Datanomik2 APIs47.1ClearSlide2 APIs47.0Mattermark2 APIs47.0Snaplogic1 API47.0Coinbase5 APIs46.6Matik1 API46.3Delphix2 APIs46.2Blackbird1 API46.0Uniswap2 APIs46.0PagerDuty1 API45.9Limitless2 APIs45.8Optimism1 API45.6Arpeggi Labs1 API45.3Border01 API45.3Envoy3 APIs45.3Bitski2 APIs45.2Lido Finance3 APIs45.2Linq.gg1 API45.0SpotOn15 APIs45.0Arweave1 API44.7Patch2 APIs44.7Weld1 API44.7ModernFi1 API44.6Convex3 APIs44.5Robinhood1 API44.2Adaptive Security1 API44.1Orbit1 API44.0Foursquare1 API43.7June1 API43.7Quora1 API43.7Airbnb2 APIs43.6Rasa2 APIs43.5Skydio1 API43.3Syndicate1 API43.2Doppel1 API43.1Forta1 API42.8k-ID1 API42.7Mysten Labs3 APIs42.7Reddit2 APIs42.7CoinSwitch1 API42.6Navan1 API42.6Socket1 API42.5Replay1 API42.4Engflow1 API42.1Aleo1 API41.9CCP Games1 API41.9RapidAPI6 APIs41.9Forward Networks1 API41.8Mercury1 API41.8Heap2 APIs41.7Mem1 API41.7Otter27 APIs41.6Glio1 API41.4Labelbox2 APIs41.4Diaspora1 API41.3Sequence7 APIs41.2Wise1 API41.2Aloft1 API41.1Rivet1 API41.1Alation4 APIs40.8Komodo Health1 API40.8Canal1 API40.7Isovalent2 APIs40.7Cuenca1 API40.6Submittable1 API40.5Z League1 API40.5Metronome1 API40.4Smartcar1 API40.4Fudo1 API40.2HealthSherpa1 API40.1Stacker1 API40.0Eco1 API39.8Stack Machine1 API39.8Voidpet2 APIs39.8Facebook21 APIs39.6Kaedim1 API39.6Seismic Systems1 API39.6
Thin 124 Limited public surface area
GoodData1 API39.2Golden Recursion1 API39.1Hopin1 API39.1Imply1 API38.9Ampersand1 API38.7Kong1 API38.7Rutter1 API38.7Stack Overflow2 APIs38.3Upstash1 API38.1Lever41 APIs37.9Medium2 APIs37.6Netography1 API37.6Roblox8 APIs37.5MatterPort1 API37.4Affirm5 APIs37.3Alloy Automation1 API37.1Apptio1 API37.1Rigetti & Co1 API37.1Substack3 APIs37.1Coactive AI1 API37.0Dispatch2 APIs37.0Preset1 API37.0Promptfoo6 APIs36.9Clockwork Labs1 API36.8Anduril1 API36.5Fivetran1 API36.3Harbor1 API36.2CodeCombat1 API36.0IDRx1 API36.0Starburst1 API36.0XMTP7 APIs36.0Genius9 APIs35.9Manifold1 API35.9Matter Labs1 API35.9NewsBlur1 API35.9Synapse1 API35.9Apollo15 APIs35.8Gusto1 API35.8Loot Rush Games1 API35.6Espresso1 API35.5Ready Player Me3 APIs35.1Science Exchange23 APIs35.1Sky Mavis3 APIs35.0Estimote1 API34.9Samsara1 API34.9Fly.io9 APIs34.7Harvey1 API34.4Gamma.app1 API34.1Proof of Play1 API33.9Everlaw1 API33.8Golden1 API33.7Ex-Human1 API33.6xAI1 API33.6Beacons.ai1 API33.3EigenLayer7 APIs33.3Black Forest Labs1 API33.2Pixlee3 APIs33.2Ideogram1 API33.0Lime1 API33.0Here Not There Labs1 API32.8Hilbert's AI1 API32.8LayerZero4 APIs32.6Rescale2 APIs32.5Loom5 APIs32.4Apptimize1 API32.3Parsable1 API32.0SignalFx1 API31.9Screenleap1 API31.7Tally1 API31.7Granular1 API31.6Celo1 API31.4Carry1st1 API31.3PlanetScale1 API31.2Foundation2 APIs31.1Comma.ai1 API31.0Shapeways1 API31.0Sourcegraph10 APIs30.9Tenfold1 API30.8Dialpad1 API30.6Zentail1 API30.5Loop Crypto1 API30.4Cross River Bank8 APIs30.3SpaceX1 API30.3Worldcoin6 APIs30.3Alchemy12 APIs30.1Bastion1 API30.1Cask12 APIs30.1Cresta1 API30.1Angle2 APIs29.9Plai Labs1 API29.9Gamebeast1 API29.7Illumio1 API29.6Stainless1 API29.4Boosted1 API29.3Reforge1 API29.0Story Protocol1 API28.8Macro1 API28.7Maven2 APIs28.7Tindie1 API28.7ActionIQ2 APIs28.6Merkle Manufactory Inc.1 API28.2Nansen1 API28.1Series AI1 API28.1Jumio14 APIs28.0TruckSmarter1 API28.0Julep Beauty5 APIs27.9Neighbor1 API27.8Lookout1 API27.7Akita Software2 APIs27.4Etleap1 API27.4Iron Fish1 API27.4Sleeper1 API27.4NEAR4 APIs27.2Anyscale10 APIs26.9Addi1 API26.8Function Health1 API26.8Alluxio1 API26.7Clutch1 API26.7Moment1 API26.7Opendoor1 API26.7Abacus3 APIs26.6Supermove1 API26.6Valora1 API26.4Mythical Games1 API26.3
Emerging 63 Early or largely undocumented
Minimal 7 Almost no public developer surface
Unrated 2 Not yet scored

Rest of Portfolio

3 further portfolio companies that don’t yet have a provider page on the network.

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Properties

Portfolio

Where the firm publishes its investments

Team

Partners and investing staff

Content

Blog, podcast, newsletter, and research

Firm

The firm itself

Cohort brief

Auto-generated

The 747 portfolio companies with APIs in the catalog, backed by Andreessen Horowitz, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
747
of 1097 on the roster
Mean Kin Score
25.4
+1.0 vs catalog 24.4
Mean Agent Readiness
12.9
+0.2 vs catalog 12.7
Spread
1.5–87.9
median 19.9 · σ 18.5
How the 747 split by band
Exemplar 23Strong 39Developing 123Thin 129Emerging 211Minimal 222
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Developer Ergonomics 26.8 23.8 +3 747
Access Clarity 28.6 27.2 +1.4 747
Operational Transparency 15.6 14.4 +1.2 747
Discoverability 62.1 61.5 +0.6 747
Contract Quality 20.4 20.4 0 747
Contract Governance 6 6.6 -0.6 747

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.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 11% 11% 0
MCP server (first-party) 14% 13% +1
Agent Skills 0% 0% 0
OAuth scopes 8% 12% -4
Security 89% 96% -7
Arazzo workflows 4% 2% +2
Governance rules 12% 13% -1

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.

Top by Kin Score
  1. 1 Stripe 87.9
  2. 2 OpenAI 82.9
  3. 3 ElevenLabs 82.3
  4. 4 Svix 80.4
  5. 5 Optimizely 78
  6. 6 Twilio 77.8
  7. 7 Mux 77.7
  8. 8 Ghost 77.2
  9. 9 GitHub 77.2
  10. 10 Doordash 75.8
Top by Agent Readiness
  1. 1 Zapier 65.1
  2. 2 GitHub 62.6
  3. 3 Optimizely 62.5
  4. 4 Netlify 62.2
  5. 5 Webflow 61.8
  6. 6 Mem 61.3
  7. 7 Lumos 59.8
  8. 8 Box 58.9
  9. 9 Stripe 58.3
  10. 10 Clickup 57.7
This roster declares 1097 members; 1046 resolve to a provider in the catalog and 747 carry a score (71%). The figures above describe the scored members only.Generated from the catalog build of 22 September 2026, across 27674 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)

apis.yml Raw ↑
aid: a16z
name: Andreessen Horowitz
description: >-
  Andreessen Horowitz (a16z) is a Silicon Valley venture capital firm founded in July 2009 by Marc
  Andreessen and Ben Horowitz and headquartered in Menlo Park, California. The firm invests across the
  full lifecycle from seed to venture to growth-stage technology companies, deploying stage-based checks
  that range from roughly $1M-$5M into early application bets up to hundreds of millions of dollars into
  its largest AI positions. a16z organizes around dedicated practice areas: AI, American Dynamism,
  Bio + Healthcare, Consumer, Crypto, Enterprise, Fintech, Games, Infrastructure, plus specialty vehicles
  including the Cultural Leadership Fund, Perennial, and the Speedrun accelerator. With over $90B-$100B+ in
  assets under management as of early 2026 and a public portfolio of more than 1,000 companies, a16z is one
  of the largest and most influential venture firms in the world, known for its operator-led platform model
  and notable investments including Airbnb, Coinbase, GitHub, Figma, Stripe, Databricks, Anduril, and OpenAI.
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://a16z.com/favicon.ico
x-type: venture-capital
x-category: Venture Capital
created: '2026-07-17'
modified: '2026-07-17'
specificationVersion: '0.23'
tags:
  - Venture Capital
  - Seed
  - Series A
  - Growth Equity
  - Artificial Intelligence
  - Crypto
  - Fintech
  - Enterprise
  - Infrastructure
  - Developer Tools
  - American Dynamism
  - Silicon Valley
  - North America
apis: []
common:
  - type: Website
    url: https://a16z.com/
  - type: Portfolio
    url: https://a16z.com/portfolio/
  - type: Portfolio
    url: https://a16z.com/investment-list/
  - type: Portfolio
    url: portfolio/a16z-portfolio.yml
  - type: Team
    url: https://a16z.com/team/
  - type: Team
    url: team/a16z-team.yml
  - type: InvestmentThesis
    url: https://a16z.com/about/
  - type: Blog
    url: https://a16z.com/news-content/
  - type: Podcast
    url: https://a16z.com/podcasts/
  - type: Newsletter
    url: https://a16z.com/newsletters/
  - type: News
    url: https://a16z.com/news-content/
  - type: Jobs
    url: https://jobs.a16z.com/jobs
  - type: Crunchbase
    url: https://www.crunchbase.com/organization/andreessen-horowitz
  - type: LinkedIn
    url: https://www.linkedin.com/company/a16z/
  - type: Twitter
    url: https://twitter.com/a16z
  - type: Features
    data:
      - "Stage: Seed, Venture (Series A+), Growth"
      - "Typical check: ~$1M-$5M early application bets, up to hundreds of millions for largest AI positions"
      - "Sectors: AI, American Dynamism, Bio + Healthcare, Consumer, Crypto, Enterprise, Fintech, Games, Infrastructure"
      - "Geography: Primarily United States / global technology"
      - "AUM: $90B-$100B+ (as of early 2026)"
      - "Portfolio: 1,000+ companies (a16z investment list)"
      - "Founded: 2009"
      - "HQ: Menlo Park, California, USA"
    sources:
      - https://a16z.com/about/
      - https://en.wikipedia.org/wiki/Andreessen_Horowitz
      - https://a16z.com/investment-list/
    updated: '2026-07-17'
maintainers:
  - FN: Kin Lane
    email: info@apievangelist.com
    url: https://apievangelist.com
  - FN: APIs.json
    url: http://apisjson.org
  - FN: Andreessen Horowitz
    url: https://a16z.com/

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