Upcoming Web3 hackathons
Developer hackathons on the chains we cover, with dates, location, prizes and which chains each one names. Every event is checked on the organizer's own page and updated weekly. We're not affiliated with any of them.
Jump to a chain: 
Ethereum 
Arbitrum 
Stellar 
XRP Ledger 
Hedera
October 2026
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Oct 24 to Oct 25, 2026 · New York, USA · $40,000+ in prizes (as stated by the organizer)
AI & Fintech XRPL Hackathon in New York
By XRPL Commons with Ripple
A 36-hour build right before Swell where every project must be built on the XRP Ledger, with tracks including agentic finance and lending.
XRP LedgerOfficial page · checked Oct 17, 2026. Confirm dates and rules there before you travel.
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Oct 25 to Oct 26, 2026 · Lisbon, Portugal · Up to $30,000 in XLM (as stated by the organizer)
HackMeridian 2026
By Stellar Development Foundation
A two-day hackathon at ONE16 Lisbon for building on Stellar, with a Genesis track (idea to MVP) and a Scale track (prototype to production).
StellarOfficial page · checked Oct 17, 2026. Confirm dates and rules there before you travel.
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Oct 31 to Dec 6, 2026 · Online · 30,000 USD (as stated by the organizer)
Arbitrum Open House Dubai: Online Buildathon
By Arbitrum Foundation · Register by Dec 5, 2026
An online buildathon for projects on Arbitrum One or Orbit chains using Stylus or Solidity; registration opens October 31 and submissions run November 16 to December 6.
ArbitrumOfficial page · checked Oct 17, 2026. Confirm dates and rules there before you travel.
November 2026
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Nov 5 to Nov 7, 2026 · Mumbai, India
ETHGlobal Mumbai
By ETHGlobal
An in-person ETHGlobal hackathon whose sponsor prizes include tracks from the Ethereum Foundation and Hedera.
EthereumHederaOfficial page · checked Oct 17, 2026. Confirm dates and rules there before you travel.
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Nov 21 to Nov 22, 2026 · Bari, Italy · EUR 12,000 (as stated by the organizer)
IXH26 Italian XRPL Hackathon
By XRPL Commons with UBRI, De Componendis Cifris and the University of Bari
A two-day hackathon at the University of Bari with three tracks, including advanced cryptography for blockchain and XRPL applications, for teams of 3 to 8.
XRP LedgerOfficial page · checked Oct 17, 2026. Confirm dates and rules there before you travel.
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