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OKX.AI Genesis Hackathon - Jul 2–17 (submit by 2026-07-17 23:59 UTC) - $100,000 USDT - remote/online - Strong agent ASP fit + exchange payout rails; very tight lead time (~2 days). web3.okx.com/xlayer/build-x-series · hackquest.io/en/hackathons/OKXAI-Genesis-Hackathon
BUIDL_QUESTS 2026 (amber.ac / OpenArena) - build open now; reg closes 2026-08-12 18:00 SGT; SG finals Oct 5–6 - $50k+ cash + $350k+ credits (~$400k total support) - remote build (Top 10 → Singapore) - Best mid-horizon agents/crypto fit for a solo India builder. openarena.to/en/events/buidl-quests-2026 · prnewswire.com/apac/news-releases/amber-groups-amberac-opens · x.com/ambergroup_io/status/2076909747031445969
TxODDS World Cup Hackathon (Superteam × Solana) - Jun 24–Jul 19 submission close - $50,000 stablecoin - remote/online - Real pool; sports-data/onchain tracks (markets, trading agents, fans). superteam.fun/earn/hackathon/world-cup/ · txodds.net/resources/txodds-launches-world-cup-hackathon-wit
Casper Agentic Buildathon 2026 — Final Round - finals build Jul 13–26; deadline 2026-07-26 23:59 (detail-page verified) - $150,000 total ($30k cash + $100k x402 credits + $20k in-kind) - virtual - Underrated DoraHacks agent/DeFi/RWA pick; cash slice smaller than headline. dorahacks.io/hackathon/casper-agentic-buildathon-finals/deta
ETHOnline 2026 - Sep 4–16 async - prize TBA on listing - remote async - Flagship remote ETHGlobal between Lisbon and Tokyo; apply open on events page. ethglobal.com/events · ethglobal.com/events/ethonline2026
ETHGlobal Mumbai - Nov 6–8 IRL - prize TBA - in-person Mumbai - Home-turf for India solo; long lead time; pair with Pragma Mumbai Nov 5. ethglobal.com/events · ethglobal.com/events/mumbai
Celo Agentic Payments & DeFAI Hackathon - submit by 2026-07-20 09:00 GMT - $5,000 - remote - Agent payments / DeFAI on MiniPay rails; small pool, short fuse. x.com/CeloDevs/status/2075928847955181964 · x.com/CeloDevs/status/2075581745202708991
KeeperHub — Agents Onchain - submit Jul 27–Aug 13; deadline 2026-08-13 12:00 (UTC+2) - $5,000 cash (+ $1k UX bounties) - virtual - Pure onchain agent execution stack (MCP/x402); modest pool. dorahacks.io/hackathon/agents-onchain/detail
WTF!! hackathon (iExec summer) - submit through 2026-08-01 21:59 (detail verified) - $1,500 - virtual - Privacy/TEE on existing protocols; underrated but tiny pool. dorahacks.io/hackathon/wtf-hackathon · x.com/iEx_ec/status/2076939777098879376
CHANGED — Build on Canton (Encode) - Encode now states final submissions Mon 2026-07-13 12:59 BST (earlier than known Jul 19) — treat as closed. encodeclub.com/programmes/canton-hackathon
Skipped (unchanged known): Arc Programmable Money (~Aug 22), ETHGlobal Tokyo, Rally/UXmaxx, Abridge/Anthropic SF, Monad Spark, etc. ETHGlobal Lisbon Jul 24–26 ($125k+ IRL) — app deadline cited Jul 10 (likely closed for new apps). Akindo wave-hacks: no new buildathon cards in page fetch. Kuru Agent Arena $100k = trading tournament, not DEV.