LIST OF HACKATHON FOR OCTOBER.

A List of Web3, AI & Web2 Hackathons

Compiled by @onlyonealexia

There are a lot of hackathon lists that look impressive until you actually open the links. I compiled a list of ongoing and upcoming hacks so you don't have to.

Starting strong with 👇

🤖 AI & Agents

Qollab x IonQ Global Quantum Hackathon with @IonQ_Inc $10,000 cash + $20,000 compute, registration closes Oct 6, sprint Oct 9 to 11 Quantum algorithms with Qiskit + IonQ hardware [qollab.xyz/programs/hackathon]

Bitget AI Hackathon S2 by @bitget_ai $50,000 USDT, Oct 8 Autonomous AI trading agents + market intelligence. Qwen, Chainbase, Kaito [x.com/bitget_ai]

#neatHack by @neatlogs $10,000 + engineering roles & internships, Oct 10 to 11 Developer tools, logs, observability. 48-hour sprint [luma.com/s5blr882]

WEEX AI Wars II by @WEEX_Official $200,000, closes Oct 12 Human vs AI, autonomous trading [dorahacks.io/hackathon/weex-ai-wars2]

Open Agent Hackathon 2026 up to $20,000 across 4 tracks + tinkerer track, registration closes Oct 13, build Oct 15 to 20 Production AI agents with persistent memory + multi-step reasoning [hackathon.genai.works]

Graph Hacks: Context for AI Agents by @falkordb $20,000 in hardware + cash (iPhone 18 Pro, PS5), Oct 15 to 18 FalkorDB graph DBs as persistent agent memory [wemakedevs.org/hackathons/falkordb]

Build, Ship, Shape: Amazon Developer Hackathon by @awscloud $138,000 cash + AWS credits, closes Oct 23 Fire TV, Alexa+, Bee wearable AI, Ring. 8+ cash prizes [amazonappdev2026.devpost.com]

ARC Prize 2026 by @arcprize ~$700K to $850K, merger Oct 26, final Nov 2 Novel visual reasoning via few-shot programmatic abstraction [arcprize.org]

Life After Code by @gitlab prize TBA, closes Oct 27 Agentic automation across post-code DevSecOps. GitLab, Google Cloud, Anthropic [gitlab-transcend.devpost.com]

AWS Communication Developer Services Agentic AI Partner Hackathon by @awscloud $40,000, closes Oct 28 [aws-cds-partner.devpost.com]

Nebius x NVIDIA Global AI Hackathon by @nebiusai x @nvidia $50,000+ total, closes Oct 30 Agentic engineering + open-weight models on Nebius GPU cloud. 23+ slots [nebiusglobalaihackathon.devpost.com]

Qloo Agentic Hackathon by @Qloo $25,000 cash, closes Oct 30 AI agents using Qloo's taste + cultural intelligence graph [qloo.devpost.com]

Anna AI App Builder Program $6,000, closes Oct 31 AI-native apps + productivity workflows on Anna AI [dorahacks.io/hackathon/2349]

3alet Hackathon by @jigjoy_ai x @mozaik_runtime $1,000 across top 3 + Mozaik cloud premium, closes Oct 31 Systems of collaborating AI agents using Mozaik [jigjoy.ai/hackathon-2026]

OpenCV AI Competition 2026 by @OpenCVLive $20,250, closes Oct 27 Computer vision, spatial AI, deep learning on cloud. Powered by AWS [opencv26.devpost.com]

Vultr: Agent Rush Hackathon by @Vultr x @lablabai online phase Nov 3 to 8 Functional AI agents on Vultr cloud compute [lablab.ai/ai-hackathons]

ET AI Hackathon 2026: Agentic Edition begins Nov 2, virtual Enterprise multi-agent AI. For pros (~3+ yrs experience) [airmeet.com]

North America HPC Hackathon Oct 19 to 20, virtual AI + High-Performance Computing [openhackathons.org]

ForgeHacks Online 2026 student, closes Oct 10 AI for real-world problems: healthcare, education, climate, cybersecurity [forgehacks.dev]

Hackyard #4: Gamification solo AI hackathon, Oct 5 to 11 [dev.events]

WarriorHacks 2.0 closes Oct 14, online [dev.events]

Multimodal AI Hackathon 2026 (IIT Mandi) closes Oct 14, online [multimodal-ai-hackathon-2026-7.devpost.com]

MLAI Hackathon 2026 closes Oct 16, online [dev.events]

Hack Apertus Oct 1 to 16, online [dev.events]

AiTHON 2.0 closes Oct 23, Singapore + online [dev.events]

Build With AI: Basics closes Oct 26, online, beginner-friendly [dev.events]

HackFW: MADE Challenge Oct 1 to 30, Fort Worth TX [dev.events]

TechEx Amsterdam: AI & Big Data Expo Europe on @lablabai online Oct 16 to 19, on-site Oct 19 to 20 AI, cybersecurity, cloud, IoT, automation, edge [lablab.ai/ai-hackathons]

Lablab x AMD AI Academy Challenge by @AMD x @lablabai online Oct 12 to 17, on-site Oct 17 to 18 3-month AMD-powered developer program [lablab.ai/ai-hackathons]

Hacktoberfest 2026 by @DigitalOcean month-long, all October, free Open-source AI + open-weight models. 300+ Fests worldwide + online, swag shipped to you [hacktoberfest.com]

Ayiti AI register now, closes Oct 18 [ayiti.ai]

Since AI (Turku) in-person, Turku Finland [sinceai.ai]

Ryo-chan Virtual Hackathon 2026 by @ryodigital $15,000 in tokens + all-expenses trip to Tokyo, closes Nov 11 Agents, dashboards, skills. 15 awards [ryobuild.com]

Beyond the Benchmark: Binance Agentic AI Challenge by @binance $6,000, closes Nov 13 [dorahacks.io/hackathon/binance]

Google Gemma 4 Developer Agent Competition by @GoogleDeepMind $65,000 cash, closes Nov 12 (active all October) Fine-tune open Gemma models to resolve software issues autonomously [kaggle.com/competitions/gemma-4-developer-agent]

⛓️ Web3 & Blockchain

Solana Mobile: Clock In by @solanamobile $135,000 total, closes Oct 8 Mobile-first Android dapps for the Seeker device. 11 winning slots [solanamobile.radiant.nexus]

BNB Hack: Tokenized Stocks Edition by @BNBCHAIN $20,000 track allocation, closes Oct 11 Tokenized RWAs, stock trading tooling, Binance Web3 Wallet [bnbchain.org/en/hackathons/tokenized-stocks]

Colosseum: Crypto World's Fair by @colosseum $465,000+ liquid cash, closes Oct 12 $30K grand, twenty $15K awards, $100K Solana track, $25K Base track + Superteam sidetracks. Plus $250K seed checks [arena.colosseum.org]

Monad Metropolis Hackathon by @monad_xyz $250,000+ across 4 tracks, closes Oct 13 Onchain finance, consumer/payments, social/culture, trust/identity/AI [hackathon.monad.xyz]

Arc Microgrants Mainnet Challenge $10,000 USDC as twenty $500 builder checks, closes Oct 14 MVPs on Arc mainnet using Circle programmable wallets [community.arc.io]

Mezo Buildathon Wave 1 $7,000 in MEZO across 2 waves, Oct 16 to Nov 15, workshop Oct 13 Bitcoin economic-layer apps, mUSD/Mezo DeFi, bots [app.akindo.io/wave-hacks]

PortalDot Hacker House 2026 by @PortaldotL0 $5,200, kickoff Oct 14, check-in Oct 24, final Nov 6 Rust, ink!, Solidity smart contracts [dorahacks.io/hackathon/portaldot-hacker-house-2026]

BLI Legal Tech Hackathon 2 $20,000, closes Oct 31 (Nov 1 on some listings) Smart contract compliance, legal automation, dispute ledgers, regtech [dorahacks.io/hackathon/legal-hack-2026]

Tapeout Genesis Transistor Hackathon $14,000, active October Design a circuit or processor on X Layer via Tapeout Factory [ignix.bot/x_campaign]

ETH Lagos 2026 Hackathon by @Web3Bridge Oct 8 to 10, Lagos [hacklist.io]

HackMeridian by @StellarOrg applications open, Lisbon Stellar ecosystem builds [hackmeridian.com]

TUM Blockchain & AI Hackathon Oct 30 to 31, Munich [hackathon.tum-blockchain.com]

Event Contracts Hackathon online, closes Oct 31 Web3 event-contract tooling [dev.events]

MDBA Youth Blockchain Hackathon online, closes Oct 31 [dev.events]

Circle Grants rolling Build on Circle / USDC [circle.questbook.app]

From Vision to Impact: Building Web3 for Social Good hybrid/Singapore, closes Oct 24 Smart contracts, DAOs, blockchain for environmental & community impact [dorahacks.io/hackathon/web3-social-good-2026]

ETHGlobal Mumbai by @ETHGlobal Nov 5 to 7, in-person Mumbai Ethereum apps, L2s, ZK networks, consumer crypto. Pragma Mumbai Nov 4 [ethglobal.com/events/mumbai]

QIE 3.0 Blockchain Hackathon $17,000, build window open, closes Nov 30 [hackathon.qie.digital]

💻 Web2 & General Dev

Run October Jam by @run $30,000 across 15 slots, Oct 8 to Nov 2 Games, interactive stories, videos on Run via browser studios or rundot CLI [events.run.world/events/octoberjam]

Meta VR Start Developer Competition 2026 by @Meta $1,000,000 cash, closes Nov 18 (active all October) Horizon OS + Quest 3 spatial apps & games. Must join the free Meta VR Start program first [start-developer-competition-26.devpost.com]

Build What's Next with PayPal and AI by @PayPal $67,500 cash, Oct 1 to Nov 12 PayPal APIs + autonomous AI agents. Bounties from Render, AG Grid, Postman [developer.paypal.com]

GSMA MENA Ignite Open Gateway Hackathon by @GSMA top 3 cash + travel to MWC Doha (amounts TBA), closes Oct 30 CAMARA network APIs + AI for telecom [gsma.com/solutions-and-impact/gsma-open-gateway]

Raspberry Pi RP2350 Hacking Challenge 2 by @Raspberry_Pi $20,000 bounty, closes Oct 31 First documented side-channel AES key extraction from RP2350 secure boot [github.com/raspberrypi/rp2350_hacking_challenge_2]

YouCam API Skin AI & eCommerce VTO Hackathon by @PerfectCorp Sep 29 to Nov 2, online Virtual try-on tech + eCommerce integrations [youcam-api-skin-ai-ecommerce.devpost.com]

RESPAWN Game Jam Oct 12 to 15, virtual Rapid game engine dev, browser titles [devpost.com/hackathons]

Redhawk Builds 2026 $3,500, Nov 7 to 8 Frontend fintech + consumer ML [redhawk-builds-2026.devpost.com]

🔬 Science, Health & Impact

RSNA Knee Abnormality Detection Challenge by @RSNA $77,000 cash across top 5, merger Oct 15, final Oct 22 Multimodal MRI analysis + multilingual radiology report models [kaggle.com/competitions/rsna-knee-abnormality-detection]

IEEE ClimateChain Global Hackathon by @IEEEorg $3,000, closes Oct 25 [ieee-climatechain-hack.devpost.com]

Enveda CASMI 2026 by @envedabio $50,000 cash across top 5, entry Dec 7, final Dec 14 (runs through October) Predicting small-molecule 2D structures from mass spectrometry [kaggle.com/competitions/enveda-casmi26-molecule-id-mass-spectra]

🏢 Enterprise & Privacy

#HackCanton Season 3 by @appsfactory $50,000 across tracks, closes Oct 9 Enterprise privacy applications + DAML smart contracts on Canton [appsfactory.cc/hackathons]

🎓 Student & In-Person (Oct to Nov)

Knight Hacks IX in-person [2026.knighthacks.org]

HackBIOS 2K26 [hackbios.xyz]

InnoHacks 4.0 [innohacks-4.devfolio.co]

OxHack '26 Oxford [26.oxhack.net]

HackOHI/O Ohio State [hack.osu.edu]

👀 Coming Up / Watch

@commonsmade is expected to announce another builder hackathon later this month. Worth watching before it gets crowded.

Arca: The Agent Capital Hackathon Date not announced yet [form.typeform.com/to/tBJ8Q1io]

A giant prize headline does not automatically make something worth three days of your life. Check the rules, number of prize slots, eligibility, required integrations, judging criteria, and what the prize actually pays out in before you commit.

Then pick one thing you can ship.

If this saved you hours of searching, follow me. I drop lists like this every month 🔁

Which one are you building for? 👇