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 1099 publish APIs here 15 properties
Venture CapitalSeedSeries AGrowth EquityArtificial IntelligenceCryptoFintechEnterpriseInfrastructureDeveloper ToolsAmerican DynamismSilicon ValleyNorth America
Portfolio Strength across 377 profiled portfolio companies on the network
65 top-rated API companies 22 exemplar · 43 strong
130 agent-ready companies 15 agent-native · 115 agent-ready
Average quality of the book:
Composite thin 38.7
Agent-Readiness agent-aware 23.5

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 377 (34%) publish APIs indexed here. The remaining 722 are tracked as profiles without a published API on the network.

Its highest-rated API providers on the network are Twilio, OpenAI, GitHub, ElevenLabs, Stripe.

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 22 Complete, well-documented, and agent-ready
Strong 43 Solid coverage with minor gaps
Developing 112 Usable, with meaningful gaps to close
Basis2 published contracts54.2Descript1 published contract54.2Resend1 published contract54.1Replicate1 published contract53.1Workboard3 published contracts52.6Nym Technologies3 published contracts51.9Eligible5 APIs51.8Instabase2 published contracts51.8Flock Safety1 published contract51.4Lighter1 published contract51.4Orderful1 published contract51.2Avalanche2 published contracts51.1Uthana2 APIs51.0Repl.it1 published contract50.7Wefunder1 published contract50.7Replay1 API50.5Pinterest1 published contract50.0Neon Commerce10 published contracts49.9ClearSlide2 published contracts49.8Yuno1 published contract49.7Mistral AI13 published contracts49.6Thatch Health2 published contracts49.3Equals1 published contract49.2Lyft2 published contracts48.7Payrails1 API48.7Rainforest QA1 published contract48.5Matik1 API48.4Kaedim1 published contract48.3Unravel Data Systems1 API48.3Hedra1 published contract48.1Halliday1 published contract48.0Zencoder2 published contracts47.8Biodock1 published contract47.7Stainless4 published contracts47.7Anchorage3 published contracts47.6Mattermark4 published contracts47.5Delphix2 published contracts47.3Tanium3 published contracts46.9Aghanim2 published contracts46.3Dyno4 published contracts46.3Reflektive1 published contract46.2Trunk1 published contract46.1Limitless4 published contracts46.0Airbnb2 published contracts45.9Border01 published contract45.9Rasa2 published contracts45.9Merit Systems3 published contracts45.8OpenSea1 published contract45.8Convex3 published contracts45.4Pimlico2 APIs45.4Weld1 published contract45.3Prosper AI1 published contract45.2Kodex2 APIs45.0PagerDuty1 published contract45.0Datanomik2 published contracts44.9Devoted Health3 published contracts44.9Arpeggi Labs1 published contract44.7Clever2 published contracts44.7Glio2 published contracts44.6Adaptive Security1 published contract44.5Doppel1 published contract44.5Envoy3 published contracts44.0RapidAPI6 published contracts44.0k-ID1 API43.9Coinbase5 published contracts43.7Socket1 published contract43.6SpotOn15 APIs43.6Uniswap2 published contracts43.6Blackbird1 published contract43.4CCP Games1 published contract43.4Reddit2 published contracts43.4Engflow1 API43.3Forta1 API43.2Forward Networks1 published contract43.2Patch2 published contracts43.1June1 published contract43.0Mysten Labs3 APIs42.9Aloft2 published contracts42.8Quora1 published contract42.8Mem1 published contract42.5ModernFi1 published contract42.4Bitski2 published contracts42.2Diaspora1 published contract42.2Optimism1 published contract42.2Foursquare1 published contract42.0Promptfoo6 APIs41.7CoinSwitch1 API41.6Imply1 API41.6Linq.gg1 API41.6Otter27 APIs41.6Facebook21 APIs41.3Fivetran1 published contract41.3Arweave1 published contract41.2Robinhood1 published contract41.2Aleo1 published contract41.1Isovalent2 published contracts41.1Syndicate2 published contracts40.9Labelbox2 APIs40.8Alation4 published contracts40.7Seismic Systems1 published contract40.7Canal1 published contract40.4Heap2 published contracts40.4Skydio1 published contract40.4Mercury1 published contract40.2Z League1 published contract40.2Rivet1 published contract40.0Smartcar1 published contract40.0Sequence7 published contracts39.8Substack3 APIs39.8Wise1 published contract39.6Cuenca1 API39.5Navan1 published contract39.4
Thin 118 Limited public surface area
Stack Machine1 API39.2Hopin1 published contract39.1MatterPort1 API38.9Metronome1 published contract38.9Ex-Human1 published contract38.7Stack Overflow2 published contracts38.7Submittable1 published contract38.6Stacker1 published contract38.5Dispatch2 published contracts38.1Komodo Health1 API38.1Fudo2 published contracts38.0Eco2 published contracts37.9Golden Recursion2 published contracts37.9HealthSherpa1 published contract37.9Clockwork Labs1 API37.8Starburst1 API37.8GoodData1 published contract37.7Medium2 published contracts37.7Voidpet4 published contracts37.5Kong1 published contract37.4Ampersand2 published contracts37.1Genius9 APIs37.1Rutter1 published contract37.1Coactive AI2 published contracts37.0Netography2 published contracts37.0Gamma.app1 API36.9Lever24 APIs36.8Rigetti & Co1 published contract36.8Matter Labs1 API36.4Anduril1 published contract36.2Upstash1 published contract36.2Beacons.ai1 API36.0Gusto1 published contract36.0Fly.io9 APIs35.8Harbor1 published contract35.5Synapse1 published contract35.4Apptio1 published contract35.3Espresso1 API35.3NewsBlur1 published contract35.2Hilbert's AI1 published contract34.8Alloy Automation1 published contract34.7XMTP7 APIs34.7Affirm5 published contracts34.6IDRx1 published contract34.6Rescale2 APIs34.5Loot Rush Games1 published contract34.4Preset1 published contract34.4Pixlee3 APIs34.3Estimote1 API34.2Proof of Play2 published contracts33.9Roblox8 APIs33.6Shapeways1 published contract33.5xAI1 published contract33.4Science Exchange23 APIs33.3Parsable1 API33.2Sky Mavis3 APIs33.1Samsara1 published contract32.9Here Not There Labs1 API32.8Screenleap1 published contract32.8Lime1 published contract32.7CodeCombat2 published contracts32.5Golden2 published contracts32.5Granular1 published contract32.1Manifold1 published contract32.0Comma.ai1 API31.8Cresta1 API31.7Boosted1 API31.6Zentail1 API31.6Ideogram1 published contract31.4Cask12 APIs31.2Everlaw1 API31.0LayerZero7 published contracts31.0Black Forest Labs1 published contract30.9Apptimize1 published contract30.8Illumio1 API30.8Gamebeast1 API30.5ActionIQ2 APIs30.4Carry1st1 published contract30.4Celo1 API30.4EigenLayer7 APIs30.4Lookout1 API30.3Sourcegraph10 APIs30.2Alchemy12 APIs30.1Reforge1 API30.0Abacus3 APIs29.9PlanetScale1 published contract29.8Tally1 published contract29.8Angle3 published contracts29.7Cross River Bank8 APIs29.6Alluxio1 API29.5Bastion1 API29.5Macro1 API29.5SpaceX1 published contract29.4Worldcoin6 APIs29.3Dialpad1 published contract29.2Etleap1 API29.2Tenfold1 published contract29.2TruckSmarter1 published contract29.0Plai Labs1 API28.9Foundation2 APIs28.8Julep Beauty5 APIs28.5Series AI1 API28.5Sleeper1 published contract28.5Merkle Manufactory Inc.1 published contract28.4Tindie1 published contract27.9Lido Finance7 published contracts27.7Akita Software2 APIs27.5Maven2 published contracts27.5Nansen1 published contract27.4Story Protocol2 published contracts27.4Oasis Labs1 API27.2Clutch1 API27.1Iron Fish1 API27.0Moment1 API26.6Mythical Games1 API26.6Jumio14 APIs26.5Tecton1 API26.5Groupon3 APIs26.3
Emerging 69 Early or largely undocumented
Minimal 13 Almost no public developer surface

Rest of Portfolio

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

Polychain

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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 763 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
763
of 1099 on the roster
Mean Kin Score
23.9
+1.0 vs catalog 22.9
Mean Agent Readiness
12.4
+0.4 vs catalog 12
Spread
0–86.5
median 18.2 · σ 18.7
How the 763 split by band
Exemplar 19Strong 40Developing 117Thin 127Emerging 204Minimal 256
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Developer Ergonomics 25.8 23.1 +2.7 763
Operational Transparency 14.9 13.6 +1.3 763
Access Clarity 27.5 26.4 +1.1 763
Contract Quality 17.8 17.6 +0.2 763
Discoverability 58.1 58.2 -0.1 763
Contract Governance 5.7 6.3 -0.6 763

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) 17% 15% +2
MCP server (first-party) 16% 12% +4
Agent Skills 0% 0% 0
OAuth scopes 9% 11% -2
Security 97% 98% -1
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 OpenAI 86.5
  2. 2 ElevenLabs 82.3
  3. 3 Stripe 82.1
  4. 4 Optimizely 81.3
  5. 5 Ghost 78.4
  6. 6 Doordash 77.7
  7. 7 GitHub 77.7
  8. 8 Mux 77.6
  9. 9 Svix 76.7
  10. 10 Twilio 74.3
Top by Agent Readiness
  1. 1 Zapier 64.7
  2. 2 Optimizely 62.5
  3. 3 GitHub 62.2
  4. 4 Webflow 61.4
  5. 5 Mem 61.3
  6. 6 Clickup 60.3
  7. 7 Netlify 60
  8. 8 Lumos 59.8
  9. 9 Box 58.6
  10. 10 Stripe 58.3
This roster declares 1099 members; 1044 resolve to a provider in the catalog and 763 carry a score (73%). The figures above describe the scored members only.
Coverage caveat. 670 of 763 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)

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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