Accelerator

Y Combinator

Y Combinator is the most influential startup accelerator in the world, founded in 2005 by Paul Graham, Jessica Livingston, Robert Tappan Morris, and Trevor Blackwell. Originally split between Cambridge, Massachusetts and Mountain View, California, YC consolidated in Silicon Valley and is now headquartered in San Francisco. YC runs a three-month program four times a year (winter, spring, summer, fall), each batch typically funding 250-300 early-stage startups. Its standard deal invests $500,000 in every company: $125,000 for 7% of the company on a post-money SAFE, plus $375,000 on an uncapped SAFE with a Most Favored Nation (MFN) provision. YC has funded more than 5,000 companies with a combined valuation exceeding $600 billion, including Airbnb, Stripe, Coinbase, DoorDash, Instacart, Dropbox, Reddit, Twitch, GitLab, and Ginkgo Bioworks. The firm is led by president and CEO Garry Tan, a General Partner and himself a YC alum. YC is sector-agnostic but heavily developer-tools, AI, fintech, B2B/SaaS, infrastructure, healthcare, and hard-tech oriented, and its alumni network of 6,000+ founders, plus Demo Day, Startup School, Work at a Startup, and Hacker News, form the connective tissue of the modern startup ecosystem.

839 portfolio companies 838 publish APIs here 14 properties

Venture Capital Accelerator Seed Developer Tools Artificial Intelligence Fintech Infrastructure B2B SaaS North America San Francisco

API Evangelist Portfolio Report

The Y Combinator API Portfolio

Every Y Combinator company that ships an API, scored the way a machine reads it — and why the batch is agent-native and governance-empty at the same time.

Read the report $750.00 · every API-bearing company in the book, scored on the Kin Score

Portfolio Strength across 837 profiled portfolio companies on the network

41 top-rated API companies 9 exemplar · 32 strong

165 agent-ready companies 33 agent-native · 132 agent-ready

Average quality of the book:

Composite emerging 21.3

Agent-Readiness human-only 12.9

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.

Y Combinator has 839 portfolio companies tracked on the APIs.io network, of which 838 (100%) publish APIs indexed here.

Its highest-rated API providers on the network are Stripe, Zapier, Gitlab, Webflow, Ironclad.

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 9 Complete, well-documented, and agent-ready

Stripe 159 APIs 84.7 Zapier 13 APIs 79.3 Gitlab 44 APIs 74.3 Webflow 23 APIs 71.9 Ironclad 13 APIs 69.6 Paystack 21 APIs 68.5 Amplitude 33 APIs 68.0 Coasty 8 APIs 67.4 Mixpanel 22 APIs 66.4

Strong 32 Solid coverage with minor gaps

Hellosign 12 APIs 65.8 Segment 23 APIs 65.8 Readme 14 APIs 65.3 Kita 14 APIs 64.5 Doordash 12 APIs 63.6 Heroku 14 APIs 63.0 Pagerduty 38 APIs 62.6 Compresr 27 APIs 62.5 S2 Dev 6 APIs 62.4 Rainforest 23 APIs 61.5 Didit 17 APIs 60.9 Deepgram 12 APIs 60.3 Usergems 3 APIs 59.7 Mezmo 21 APIs 59.5 Backpack 15 APIs 59.3 Daily 13 APIs 58.9 Minicor 3 APIs 58.8 Groww 6 APIs 58.7 Plivo 24 APIs 58.6 Openrelay 19 APIs 58.4 Resolve 12 APIs 58.4 Optimizely 34 APIs 58.2 Rippling 22 APIs 58.0 Coinbase 29 APIs 57.6 Go1 4 APIs 57.6 Agentcard 5 APIs 57.0 Lattice 11 APIs 56.7 Contextdev 7 APIs 56.5 Dyspatch 20 APIs 56.5 Tetrascience 35 APIs 56.5 Drippay 23 APIs 56.2 Replicas 13 APIs 56.2

Developing 121 Usable, with meaningful gaps to close

Rightnow 7 APIs 55.8 Allowance 3 APIs 55.5 Lucent 4 APIs 55.5 Corelayer 1 API 55.4 Reddit 21 APIs 55.3 Jinba 14 APIs 55.1 Twitch 43 APIs 55.1 Definite 1 API 55.0 Inth 5 APIs 55.0 Getaccept 12 APIs 54.9 Flock Safety 10 APIs 54.8 Padlet 7 APIs 54.7 Speko 4 APIs 54.7 Insforge 11 APIs 54.5 Trybloom 3 APIs 54.5 Airbnb 11 APIs 54.3 Clawvisor 5 APIs 54.1 Primer 5 APIs 53.9 Heap 10 APIs 53.7 Lever 41 APIs 53.4 Confident Lims 10 APIs 53.3 Agnost Ai 14 APIs 53.2 Skymerse 1 API 53.2 Influxdata 45 APIs 52.6 Testerarmy 5 APIs 52.6 Front 39 APIs 52.2 Codag 19 APIs 51.9 Lob 46 APIs 51.9 Tempo 6 APIs 51.9 Openwork 37 APIs 51.8 Mason 8 APIs 51.7 Rentahuman 3 APIs 51.7 Sourcebot 5 APIs 51.7 Zeplin 16 APIs 51.7 Glue 1 API 51.6 Wefunder 13 APIs 51.6 Forum 9 APIs 51.5 Interfaze 1 API 51.5 Gojiberry Ai 8 APIs 51.1 Brownie 1 API 51.0 Clever 11 APIs 50.9 Dispatch 11 APIs 50.9 Fountain 1 API 50.9 Onecli 24 APIs 50.8 Superlog 4 APIs 50.7 Mireye 17 APIs 50.6 The Hog 8 APIs 50.5 Zerosettle 12 APIs 50.5 Drchrono 6 APIs 50.4 Totalis 7 APIs 50.4 Boom Ai 10 APIs 50.3 Sponge 10 APIs 50.3 Heroic Labs 2 APIs 50.1 Squid 6 APIs 50.1 Agentphone 13 APIs 50.0 Smol Machines 19 APIs 49.9 Understudy Labs 12 APIs 49.5 Sfox 3 APIs 49.1 Dropbox 28 APIs 49.0 Qomplement 7 APIs 49.0 Constellation Space 3 APIs 48.9 Shortkit 5 APIs 48.9 Sonarly 3 APIs 48.9 Cognito 1 API 48.8 Benchling 57 APIs 48.7 Bird 10 APIs 48.6 Scott Ai 30 APIs 48.4 Fixture 11 APIs 48.3 Chamber 4 APIs 48.2 Uselemma 4 APIs 48.2 Nex 16 APIs 48.1 Permutive 6 APIs 48.1 Kugelaudio 14 APIs 48.0 Shipbob 10 APIs 47.8 Apollo 15 APIs 47.7 Eigenpal 6 APIs 47.6 Font Awesome 1 API 47.6 Rigetti Computing 9 APIs 47.2 Trellistech 2 APIs 47.1 Usenarrative 6 APIs 46.9 Limrun 7 APIs 46.8 Rhizome Ai 1 API 46.8 Scale Ai 9 APIs 46.8 Notyfi 5 APIs 46.5 Telemetron Ai 4 APIs 46.5 Rapidfolio 1 API 46.3 Ardent 6 APIs 46.2 Screenpipe 18 APIs 45.9 Sentrial 2 APIs 45.9 Oximy 3 APIs 45.7 Amika 12 APIs 45.6 Buxfer 5 APIs 45.6 Razorpay 6 APIs 45.4 Codecombat 6 APIs 45.3 Gocardless 16 APIs 45.1 Cratejoy 2 APIs 44.6 Healthsherpa 5 APIs 44.6 Sequence Markets 1 API 43.9 Easypost 11 APIs 43.8 Hevn Inc 31 APIs 43.8 Lua Global Inc 1 API 43.8 Arc Prize Foundation 3 APIs 43.6 Fivetran 9 APIs 43.5 The Token Company 2 APIs 43.5 Human Interest 1 API 43.4 Overshoot 8 APIs 43.4 Litmus Hiring 3 APIs 43.2 Sitefire 1 API 43.2 Alchemy 12 APIs 43.0 Alloovium 1 API 43.0 Estimote Inc 1 API 42.9 Newsblur 7 APIs 42.9 Brex 3 APIs 42.7 Flip 3 APIs 42.7 Moxion Power Co 6 APIs 42.6 Hexa 9 APIs 42.4 Gusto 12 APIs 42.3 Klaus Ai 1 API 42.3 One Degree 6 APIs 42.2 Ressl Ai 2 APIs 42.2 Nine Fives 5 APIs 42.0

Thin 73 Limited public surface area

Instacart 10 APIs 41.7 Submittable 10 APIs 41.6 Metorial 1 API 41.5 Polymath 10 APIs 41.5 Screenleap Inc 1 API 41.4 Strand Ai 4 APIs 41.4 Unisson 45 APIs 41.3 Guesty 5 APIs 41.2 Terminal Use 28 APIs 41.2 Oddpool 2 APIs 40.9 Archal 5 APIs 40.8 Quartzy 6 APIs 40.6 River Markets 13 APIs 40.5 Maven 3 APIs 40.4 Platzi 6 APIs 40.4 Chert 1 API 40.2 Matterport 1 API 39.9 Orthogonal 3 APIs 39.7 Lightsprint 1 API 39.6 Hoplite 1 API 39.5 Keyframe Labs 4 APIs 39.4 Weave 1 API 39.4 Mattermost 6 APIs 38.3 Valgo 8 APIs 38.3 Checkr 14 APIs 38.2 Moda 2 APIs 38.0 Bitmovin 18 APIs 37.9 End Close 12 APIs 37.7 Modern 8 APIs 37.7 Runtime 1 API 37.5 Kalpa Labs 3 APIs 37.3 Reasonblocks 9 APIs 36.8 Userlens 1 API 36.4 Netter 44 APIs 36.3 Chatfuel 2 APIs 35.9 Eight Sleep 7 APIs 35.9 Radar 7 APIs 35.9 Weebly 1 API 35.8 Codenow 1 API 35.6 Xendit 8 APIs 35.3 Characterquilt 2 APIs 35.2 Truevault 1 API 35.0 Cleartax 5 APIs 34.8 Tsenta 1 API 34.1 Wato 1 API 33.9 Getbalance 1 API 33.6 Silmaril 1 API 33.6 Salesgraph 3 APIs 33.5 Flexport 10 APIs 32.8 Etleap 1 API 32.7 Korso 32.7 21st 32.5 Voltair 16 APIs 32.4 Virtualmin 1 API 32.1 Pushbullet 11 APIs 31.7 Samora Ai 3 APIs 31.5 Mixerbox 3 APIs 31.4 Lugg 1 API 31.3 Machine0 1 API 31.1 Onesignal 4 APIs 30.5 Zentail 1 API 30.5 Hive 13 APIs 30.4 Corvera 1 API 30.3 Specific 1 API 30.1 Armature 1 API 30.0 Tolmo 1 API 29.8 Transload 22 APIs 29.8 Mux 4 APIs 29.7 Martini 1 API 29.2 Synthetic Sciences 1 API 29.2 Arga Labs 1 API 29.1 Streak 8 APIs 29.1 Rindler 1 API 28.4

Emerging 205 Early or largely undocumented

Crow 1 API 27.5 Carrot Labs 1 API 27.4 Chaldal 5 APIs 27.3 Instawork 1 API 27.3 Podium 1 API 27.3 Bentolabs Ai 27.2 Byteport 1 API 27.0 Primitive 22 APIs 27.0 Opentrade 1 API 26.9 Tasklet 2 26.9 Asterlab 1 API 26.8 Memory Store 1 API 26.5 Taiga 1 API 26.1 Skillsync 26.0 Equipmentshare 1 API 25.9 Strikingly 1 API 25.9 Gemnote 3 APIs 25.6 Insurf 25.5 Mendral 25.3 Voquill 25.3 Algolia 11 APIs 25.2 Hackerrank 1 API 25.2 Bubble Lab 24.8 Flaviar 1 API 24.8 Snapmagic 1 API 24.7 Tesorio 24.5 Cumulus Labs 1 API 24.4 Callab Ai 1 API 24.3 Mio 24.3 Risklytics 1 API 24.3 Codecademy 24.1 Emdash 24.1 Klarify 24.1 Laurence 1 API 24.0 Lemonlime 23.8 Alkera Ai 23.7 Aside 23.5 Plangrid 1 API 23.5 Youart 1 API 23.5 Ashr 23.4 Perseus 23.3 Instance 28 APIs 23.2 Clicks 23.1 Nebula Security 23.1 Casetext 22.9 Lamina Labs 1 API 22.4 Trope 22.4 Amboras 22.3 Expected Parrot 21.9 Ramain 21.9 Assembly 21.8 Pentagon 21.8 Beacon Health 21.7 Runanywhere 1 API 21.6 Touchmark 1 API 21.5 Stilta 1 API 21.4 Control Seat 21.3 Openprose 21.3 Fastshot 21.2 Hyperprobe 21.0 Circuithub 20.7 Scribd 20.7 Meesho 1 API 20.5 Metricwire 1 API 20.4 Supafax 20.4 Buildzoom 1 API 20.3 Giveffect 1 API 20.3 Tdaycom 1 API 20.3 Clara 2 20.2 Double Robotics 2 APIs 20.2 Clipboard 20.0 Asendia Ai 19.8 Elyra 19.7 Palette 2 1 API 19.7 Panorama Education 19.7 Runharbor 19.7 Linzumi 1 API 19.5 Foreman 19.2 Complir 19.1 Agilemd 19.0 Bankjoy 18.9 Eligible 5 APIs 18.9 Shoptiques 1 API 18.7 Backerkit 18.6 Zinc 18.5 Clad Labs 18.3 Crunched 18.3 Robocurve 18.3 Medmonk 18.2 Patientdeskai 18.2 Revion 18.2 Legalos 18.1 Noril1 1 API 18.0 Fullseam 17.9 Tovala 17.8 Openspec 17.6 Karumi 17.5 Sazabi 17.4 Sails Co 17.2 Level Frames 17.1 Moritz 17.1 Vela 17.1 Codewisp 17.0 Openroll 17.0 Savant 17.0 Simantic 17.0 Pango 16.9 Picnicai 1 API 16.9 Coasts 16.7 Odeko 16.7 Framewise Health 16.6 Picktrace 1 API 16.5 7cups 16.4 Infera 16.4 Zidisha 16.4 Docura Health 16.3 Snapdocs 16.3 The Ticket Fairy 16.2 Diligencesquared Inc 16.1 Kimpton Ai 16.1 Opalite Health 16.1 Baseframe 16.0 Cardboard 16.0 Cleanly 16.0 Flightfox 16.0 Flowscope 16.0 General Legal 16.0 Airhelp 15.9 Almanac 15.9 Ebrandvalue 15.9 Verdant 15.9 Caremessage 15.7 Prescience Inc 15.7 Dialogus 15.6 Labdoor 15.6 Tab 15.6 Zenbu 2 15.6 Lato 15.5 Maywood 15.5 Circle Medical 15.4 Ploy 15.3 Billiontoone 15.2 Clerky 15.2 Fort 15.2 Soundboks 1 API 15.2 Lunabill 15.1 Rappi 1 API 15.0 Zarna 14.9 Enjamb Labs 14.8 Memoir 14.8 Modern Fertility 14.8 Govguard 14.7 Madethis 14.7 Outschool 14.7 Praxis Ai 2 14.7 Upwave 14.6 Velvet 14.6 Circuitlab 14.4 Prized 14.4 Zatanna 1 API 14.4 Newfront Insurance 14.3 Simplyinsured 14.3 Faire 2 APIs 14.2 Walter 14.2 Whatnot 1 API 14.2 Nowports 14.1 Textsidekick 14.1 Glen 14.0 Inventoryquant 14.0 Zenefits 1 API 14.0 80 000 Hours 13.9 Amulet 13.9 Caretta 13.9 Saffron 13.9 Goldbelly 13.8 Imperfect 13.8 Qventus 13.8 Grade 13.7 Lance 13.7 Lexius 13.7 Usereframe 13.7 Watsi 13.7 Condor Energy 13.6 Realpact 13.6 Bodyport 13.5 Bloomy 13.4 Cambly 13.4 Cignara 13.4 Crosslayer Labs 13.4 Vastrm 13.4 Kinect 13.3 Zomma 13.3 Experiment 13.2 Meadow 13.2 Sendwave 13.2 Freeport Markets 13.1 Luel 13.1 Magic 13.1 Operon 13.1 Piinpoint 13.1 Projectx 13.1 Wave 13.1 9gag 13.0 Drip Capital 13.0 Rex Inc 13.0

Minimal 397 Almost no public developer surface

Sparkles 12.9 Asimov 12.8 Hub 1 API 12.8 Assemble 12.7 Asseta 12.7 Rovi Health 12.7 Ruma Care 12.7 Svbtle 12.7 Cajal Technologies 12.6 Care Gp 12.6 Centralcoms 12.6 Hyperpad 12.6 Playablai 12.6 Robby 12.6 Kuli 12.4 Standout 12.4 Avoice 12.3 Guild 12.3 Juno Chat 12.3 Raspire 12.3 Wideframe 12.3 Amera 12.1 Arctic Health 12.0 Bayes Impact 11.9 Denta 11.9 Proximitty 11.9 Replika 11.9 Akkari 11.8 Approxima 11.8 Bluma 11.8 Cleverdeck 11.8 Imagine Ai 11.8 Item 11.8 Makrwatch 11.8 Ontora 11.8 Perfectly 11.8 Reach 11.8 Regbase 11.8 Revnu 11.8 Shred Video 11.8 Voygr 11.8 Belvedir 11.7 Payna 11.7 Sherpa 11.7 Bright 11.6 Provenmetal 11.6 Sirum 11.6 Aptdeco 11.5 Arzana 11.5 Chasi 11.5 Goat Group 11.5 Akido Labs 11.4 Ginkgo Bioworks 11.4 Polymorph 11.4 Branch8 11.3 Donkey 11.3 Heyclicky 11.3 Ooak Data 11.3 Stage 11.3 Zymbly 11.3 Booko 11.2 Focal Systems 11.2 Fundersclub 11.2 Microhealth 11.2 Levocred Ai 11.1 Lightberry 11.1 Whitespace 11.1 Withai 11.1 Jarmin 10.8 Automax Ai 10.6 Axis 2 10.6 Fuchsia 10.5 Honeylove 10.5 Klaimee 10.5 Lollipuff 10.5 Mochacare 10.5 Napkin Math 10.5 Osseus 10.5 Plate Iq 10.5 Pollinate 10.5 Smartasset 10.5 Zeitview 10.5 Arden 10.4 Chronicle Labs 10.4 Nimblerx 10.4 Povio 10.3 Vector Legal 10.3 Autositu 10.2 Rational 10.2 Tepali 10.2 Anto Biosciences 10.1 Ara 10.1 Doomersion 10.1 Greentoe 10.1 Human Archive 10.1 Magicbus 10.1 Pops 10.1 X Zell 10.1 Verdex 10.0 Hessian 9.9 Soria 9.9 Beesafe Ai 9.8 Copperlane 9.7 Grubmarket 9.7 Scope 9.7 Shoobs 9.7 Vestris 9.7 Aseon Labs 9.5 Torus 9.5 Fed10 9.4 The Human Utility 9.4 Zenflow 9.3 Ambition 9.2 Burt 9.2 Gravy 9.2 Lattice Health 9.2 Manicule 9.2 Plan0 Ai 9.2 Prototypingio 9.2 Remix 3 9.2 Trustai 9.2 Visibl Semiconductors 9.2 Democracy Earth 9.0 Panta 9.0 Zalos 9.0 Antigen 8.9 Canary 8.9 Per Vices 8.9 Pirislabs 8.9 Synphony 8.9 Aurorin Cad 8.8 Biostack Platforms 8.7 Kinro 8.7 Mtailor 8.7 Pavoot 8.7 Salus 8.7 Takecareos 8.7 Eos Ai 8.6 Hedge 8.6 Ossus 8.6 Conifer 8.5 Mth Sense 8.5 Osmaura 8.5 Andco 8.4 Brumby 8.4 Denki 8.4 New Story 8.4 Andustry 8.3 Cofactor Genomics 8.3 Noora Health 8.3 Pairio 8.3 Roomstorm 1 API 8.3 Instaagent 8.2 Rubric Ai 8.2 Givecampus 8.1 Patent Watch 8.1 Protocol Labs 8.0 Stealth Worker 8.0 Numerion Labs 7.9 Result 7.9 Libra Robotics 7.8 Haladir 7.7 10x Science 7.6 83 Sciences 7.6 Anoria 7.6 Auxos 7.6 Deep Interactions 7.6 Emailio 7.6 Hex Security 7.6 Maquoketa Research 7.6 Mousecat 7.6 Palus Finance 7.6 Savahq 7.6 Spotpay 7.6 Syntropy 7.6 Trycardinal Ai 7.6 Cofia 7.5 Isengard Industries Inc 7.5 Octavewealth 7.5 Valence 7.5 Valctrl 7.3 Avea Robotics 7.2 Pax Historia 7.2 Dayjob 7.1 Gbatteries 7.1 Specific Labs 7.1 Teabot 7.1 Tryprism 7.1 Ventura 7.1 Archer 7.0 Voxel Energy 7.0 Alchemize 1 API 6.9 Cosmic Robotics 6.9 Lab0 6.9 Leaders In Tech 6.9 Twolabs 6.9 Useparrot 6.9 Lawdingo 6.8 Astraea 6.7 Shepherd 3 6.7 Godhands 6.6 Incandor 6.5 Opencurriculum 6.5 Shotwellai 6.5 Teleport 1 API 6.5 Mashgin 6.4 Cheetah 6.3 Claimglide 6.3 Daqstra 6.3 Ditto Biosciences 6.3 Apollo Atomics Inc 6.2 Catchback Cards 6.2 Cerenovus 6.2 Inviscid Ai 6.2 Robodock 6.2 Caper 6.1 Confluence Labs 6.1 Cova 6.1 Datost 6.1 Devfast 6.1 Forge Robotics 6.1 Givemetap 6.1 Inkbox 6.1 Isono Health 6.1 Moss 6.1 Ndea Com 6.1 Panacea 6.1 Superset 6.1 Talentpluto 6.1 Tara Ai 6.1 Traverse 6.1 Zibra Labs 6.1 Mount 6.0 One Robot 5.9 Poth Labs 5.9 Quantierra 5.9 Seeing Systems 5.9 Spotangels 5.9 Kelai 5.8 Aice 5.7 Aktoria Robotics 5.7 Atlas Discovery 5.7 Axionorbital Space 5.7 Coreos 5.7 Embark Trucks 5.7 Experiential Labs 5.7 Fivestars 5.7 Florin 5.7 Gigacatalyst 5.7 Kyten Technologies 5.7 Perfectbit Inc 5.7 Philon 5.7 Pocket 1 API 5.7 Scentbird 5.7 Subvysion 5.7 The Athletic 5.7 Wepay 5.7 Huscarl 5.6 Rote 5.6 True Link 5.6 Wayco 5.6 Edviro 5.5 Nerviom 5.5 Oklo 5.5 Terranox Ai 5.5 Arlo Industries 5.4 Bellabeat 5.4 Celltype 5.4 Daivin 5.4 Fenrock Ai 5.4 Foaster 5.4 Helion Energy 5.4 Human Dx 5.4 Illume Labs 5.4 Industrial Microbes 5.4 Instaplay 5.4 Lucira Health 5.4 Mango Medical Inc 5.4 Mantis 5.4 Momentus 5.4 Nurx 5.4 Origin Bio 5.4 Parasma 5.4 Petcube 5.4 Plena Health 5.4 Prana Health 5.4 Ritivel 5.4 Shape Shapescale 5.4 Shasqi 5.4 Thrive Agritech 5.4 Zepto 5.4 6thsense 5.0 9 Mothers Corporation 5.0 Abinitio Bio 5.0 Absurd 5.0 Advanced Metal Research 5.0 Aemon 5.0 Aquashield 5.0 Atrisa 5.0 Axelrod 5.0 Bear Flag Robotics 5.0 Beyond Reach Labs 5.0 Blue Frog Gaming 5.0 Cascade 5.0 Cohesion 5.0 Congruent 5.0 Cruise 5.0 Degla Inc 5.0 Discovered Materials 5.0 Drafted 5.0 Earendil Robotics 5.0 Eden Robotics 5.0 Envariant 5.0 Everest 5.0 Expanse 5.0 Fabraix 5.0 Fern Bot 5.0 Flirtey 5.0 Floracene 5.0 Futureadvisor 5.0 General Aviation 5.0 General Instinct 5.0 Generalastro 5.0 Gitprime 5.0 Greypoint Industries 5.0 Hardware Intelligence 5.0 Hlabs 5.0 Hop Aero 5.0 Hyper 4 5.0 Icarus 5.0 Immunity Project 5.0 Inloop Robotics 5.0 Intelligence Factory 5.0 Madrone 5.0 Markhor 5.0 Markit 5.0 Markov 5.0 Mayflower 5.0 Mbx 5.0 Milliray 5.0 Miniswap 5.0 Molagri 5.0 North 5.0 O11 5.0 Octapulse 5.0 Openinvest 5.0 Origami Robotics 5.0 Ornadyne 5.0 Petrarch 5.0 Protent 5.0 Rev1 5.0 Rise Reforming 5.0 Rivet Design 5.0 Rudus 5.0 Saudara Ai 5.0 Servo7 5.0 Sqreen 5.0 Stablebrowse 5.0 Styleup 5.0 Sunfarmer 5.0 Surtr Defense Systems 5.0 Talking Computers 5.0 Teamnote 5.0 Tenet Industries 5.0 Thomas 5.0 Truffle 5.0 Wealor 5.0 Wevorce 5.0 Zephyr Fusion 5.0 Buildscience 4.8 Light Anchor 4.6 Adialante 4.3 Ekpa 4.3 Exonic 4.3 Instinct Xyz 4.3 Justinian 4.3 Lumius 4.3 Mochatrade 4.3 Pardes Bio 4.3 Proxy 4.3 Sila 4.3 Standard Signal 4.3 Verge Genomics 4.3 Machine Zone 4.1 Omgpop 4.1 Redcarpetup 4.1 Salem Robotics Inc 4.1 Scheduling Wizard 4.1 The Company Company 4.1 Truebill 3.5 Flowmanual 3.2 Reebee 3.2 Shofo 3.2 Unifold 3.2 Uno Wallet 3.2 Yardbook 3.2 Zolvo 3.2

Unrated 1 Not yet scored

Deel

Rest of Portfolio

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

Y Combinator

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Properties

Portfolio

Where the firm publishes its investments

Portfolio

Portfolio

Portfolio

Portfolio

InvestmentThesis

InvestmentThesis

Team

Partners and investing staff

Team

Team

Team

Team

Content

Blog, podcast, newsletter, and research

Blog

Blog

Firm

The firm itself

Website

Website

Jobs

Jobs

Crunchbase

Crunchbase

LinkedIn

Twitter

Twitter

Contact

Contact

Other

Everything else declared in apis.yml

Pitch

Pitch

GitHubOrganization

GitHubOrganization

Source (apis.yml)

aid: y-combinator
name: Y Combinator
description: >-
  Y Combinator is the most influential startup accelerator in the world, founded
  in 2005 by Paul Graham, Jessica Livingston, Robert Tappan Morris, and Trevor
  Blackwell. Originally split between Cambridge, Massachusetts and Mountain View,
  California, YC consolidated in Silicon Valley and is now headquartered in San
  Francisco. YC runs a three-month program four times a year (winter, spring,
  summer, fall), each batch typically funding 250-300 early-stage startups. Its
  standard deal invests $500,000 in every company: $125,000 for 7% of the company
  on a post-money SAFE, plus $375,000 on an uncapped SAFE with a Most Favored
  Nation (MFN) provision. YC has funded more than 5,000 companies with a combined
  valuation exceeding $600 billion, including Airbnb, Stripe, Coinbase, DoorDash,
  Instacart, Dropbox, Reddit, Twitch, GitLab, and Ginkgo Bioworks. The firm is
  led by president and CEO Garry Tan, a General Partner and himself a YC alum. YC
  is sector-agnostic but heavily developer-tools, AI, fintech, B2B/SaaS,
  infrastructure, healthcare, and hard-tech oriented, and its alumni network of
  6,000+ founders, plus Demo Day, Startup School, Work at a Startup, and Hacker
  News, form the connective tissue of the modern startup ecosystem.
x-type: venture-capital
x-category: Accelerator
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://www.ycombinator.com/apple-touch-icon.png
created: '2026-07-17'
modified: '2026-07-17'
specificationVersion: '0.20'
tags:
  - Venture Capital
  - Accelerator
  - Seed
  - Developer Tools
  - Artificial Intelligence
  - Fintech
  - Infrastructure
  - B2B SaaS
  - North America
  - San Francisco
apis: []
common:
  - type: Website
    url: https://www.ycombinator.com
  - type: Portfolio
    url: https://www.ycombinator.com/companies
  - type: Portfolio
    url: portfolio/y-combinator-portfolio.yml
  - type: Team
    url: https://www.ycombinator.com/people
  - type: Team
    url: team/y-combinator-team.yml
  - type: InvestmentThesis
    url: https://www.ycombinator.com/about
  - type: Blog
    url: https://www.ycombinator.com/blog
  - type: Pitch
    url: https://www.ycombinator.com/apply
  - type: Jobs
    url: https://www.workatastartup.com
  - type: Crunchbase
    url: https://www.crunchbase.com/organization/y-combinator
  - type: LinkedIn
    url: https://www.linkedin.com/school/y-combinator/
  - type: Twitter
    url: https://twitter.com/ycombinator
  - type: GitHubOrganization
    url: https://github.com/ycombinator
  - type: Contact
    url: https://www.ycombinator.com/contact
  - type: Features
    data:
      - 'Model: Accelerator (3-month program, 4 batches per year)'
      - 'Stage: Pre-seed, Seed'
      - 'Typical check: $500,000 standard deal ($125K for 7% post-money SAFE + $375K uncapped SAFE with MFN)'
      - 'Batch size: 250-300 startups per batch'
      - 'Sectors: developer tools, AI, fintech, B2B SaaS, infrastructure, healthcare, hard tech (sector-agnostic)'
      - 'Geography: primarily North America; global applicants'
      - 'Companies funded: 5,000+ (combined valuation $600B+)'
      - 'Founded: 2005'
      - 'HQ: San Francisco, CA'
    sources:
      - https://www.ycombinator.com/about
      - https://www.ycombinator.com/deal
      - https://en.wikipedia.org/wiki/Y_Combinator
    updated: '2026-07-17'
maintainers:
  - FN: Kin Lane
    email: kin@apievangelist.com
    url: https://apievangelist.com
  - FN: APIs.json
    url: http://apisjson.org
  - FN: Y Combinator
    url: https://www.ycombinator.com