Web3 hackathons
11 open web3 hackathons, each checked against the organizer's official page. 3 close in the next 7 days.
A hackathon gives you a deadline, a theme and a prize pool. Many run online for several weeks and accept solo builders, so you can enter from anywhere and work in your own time.
Money from blockchain foundations and protocols: ecosystem grants, hackathons with prize pools, retroactive funding and bug bounties for smart contracts.
CLOCK IN: The Solana Mobile Hackathon
Solana Mobile and RadiantsDAO offer $135,000 in prizes for new mobile apps on Solana. Registration is open and submissions close October 8, 2026.
Solana Perps and Prediction Markets Hackathon 2026
Solana Foundation hackathon with $100K in prizes for perpetuals and prediction market apps on Solana. Submissions due 9 October 2026.
Colosseum Crypto World's Fair Hackathon
Colosseum opens its first online hackathon for builders from all blockchain ecosystems, with prize tracks per ecosystem and a general prize pool. It runs from September 14 to October 12, 2026.
Monad Metropolis 2026
Monad Metropolis is a six week online hackathon with a $250,000+ prize pool for products built on Monad. Submissions close 13 October 2026.
Bittensor Global Subnet Hackathon
10,000 USD in prizes for teams that design and build a Bittensor subnet on testnet. Registration and submissions run until October 19, 2026.
IEEE ClimateChain Global Hackathon 2026
Online IEEE hackathon for blockchain and AI tools on climate problems. $3,000 in cash prizes, submissions October 5 to 25, 2026.
Tari October Build Contest 2026: Spooky Secrets
The Tari Council pays 1,000,000 XTM for the best new privacy project on Ootle. Entries close at 00:00 UTC on 1 November 2026.
Decentralize AI Hackathon by HackerNoon
A $51,750+ prize pool and $35,000 in compute credits for developers building open AI infrastructure. The second round of entries ends on February 27, 2027.
HackMeridian 2026: Stellar hackathon in Lisbon
HackMeridian is a two day Stellar hackathon in Lisbon on 25 and 26 October 2026, with up to $30,000 in XLM in prizes.
ETHGlobal Mumbai 2026
ETHGlobal runs a three day in person hackathon in Mumbai from November 5 to 7, 2026, with $175,000 available in prizes. Builders apply to attend.
Arbitrum Open House Dubai: Online Buildathon
The Arbitrum Foundation runs an online buildathon with a $30,000 prize pool. Registration opens October 31, 2026 and submissions close December 6.
Questions
How many web3 hackathons are open right now?
11 as of 5 October 2026. 3 close in the next 7 days.
Which web3 hackathons close soonest?
CLOCK IN: The Solana Mobile Hackathon from Solana Mobile and RadiantsDAO closes on 8 October 2026. Solana Perps and Prediction Markets Hackathon 2026 from Solana Foundation closes on 9 October 2026. Colosseum Crypto World's Fair Hackathon from Colosseum closes on 12 October 2026.
Can I apply from any country?
All of them accept applicants worldwide. Some still set conditions on age, residence or sanctions, and each entry lists them.
How is this list checked?
Every entry is written from the organizer's official page and links to it. Programs with a rolling deadline are checked again for closure, and an entry moves to the archive on the day it closes.