Arbitrum Mentorship Program Cohort 2 Applications Open

The Arbitrum Foundation has opened applications for Cohort 2 of the Arbitrum Mentorship Program, run with Robinhood Chain, for early-stage teams building on Arbitrum One and Robinhood Chain, with $100K in prizes for top-performing teams. Applications are open until December 6, 2026 and are reviewed on an ongoing basis.

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HSK Chain Horizon Hackathon Mumbai Edition

HSK Chain invites developers to the HSK Chain Horizon Hackathon (Mumbai Edition) on the tracks AI Agent Trading and Agent Payments & A2A Settlement, with a total prize pool of 10,000 USDT (5,000 USDT per track). Projects must be built on HSK Chain. Register and submit the build on the DoraHacks page; the final submission deadline is November 1, 2026, at 21:30 IST (UTC+5:30), equivalent to November 2, 2026, at 00:00 Beijing Time (UTC+8).

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Aero Bug Bounty on Sherlock: up to 500,000 USDC

Aero runs a bug bounty on Sherlock, live since Oct 21, 2026, with max rewards of 500,000 USDC. Scope and severity tiers are set on the Sherlock program page, and reports go through Sherlock. Rolling, no end date stated.

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UBC 2026 Hackathon

University Blockchain Conference offers $23K in prizes across three main tracks (Agentic Payments & AI, DeFi & Onchain Apps, Consumer Apps) plus bounties and perks, with each main track paying $2,000 1st, $1,250 2nd, $750 3rd. Online build runs Nov 13-20; submit by Nov 20, 12 PM CST on Devpost; finals Nov 21 at UT Austin.

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IXH26 Italian XRPL Hackathon

At the University of Bari, organized by Ripple's University Blockchain Research Initiative (UBRI), XRPL Commons, De Componendis Cifris and the University of Bari Aldo Moro, with a total prize pool of EUR 12,000: EUR 2,000, EUR 1,200 and EUR 800 to the top three projects in each of three tracks (advanced cryptography for blockchain, XRPL applications, tokenisation on XRPL). Teams of 3-8; registration requires host approval and closes on Tuesday, November 17.

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Base Trencher Grant Program

Base introduced the Trencher Grant Program: get up to $5,000 for leading a community or creating content about Base culture.

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AI Yako: Own Your AI hackathon in Nairobi

Tether is running an in-person QVAC hackathon at the Node NBO campus in Nairobi, Kenya, with a 3,500 USDt prize pool. Projects are due on DoraHacks by Friday 30 October, 17:00 EAT (14:00 UTC), and demo day with judging and awards is Saturday 31 October. Each team submits one project with a public repository and a demo video.

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Dev3pack Solana University Hackathon

Dev3pack is running a three-day Solana university hackathon from 27-29 November 2026, online or at one of 40+ local build stations worldwide, with $10K+ in prizes plus local tracks and the best projects getting into its accelerator. Apply at https://hack.dev3pack.xyz/

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Ink Spark builder grants: 500-20,000 USDC for live projects on Ink

Spark is Ink's builder grant track for live projects creating measurable ecosystem progress on Ink. Ink says it is especially interested in projects building around Tydro, Nado, RWA infrastructure and AI/agent infrastructure, and applicants should show evidence of live activity. The application form asks for a requested grant amount of 500-20,000 USDC, and Ink reviews Spark applications in rolling batches. No deadline stated.

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stake.link bug bounty on CertiK Hunt: up to $250,000

stake.link, a liquid staking platform, has a bug bounty program live on CertiK Hunt, offering up to $250,000 in rewards to security researchers. The program has been live since October 21, 2026, lists Ethereum as its chain and uses severity-based rewards. No deadline stated.

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Guardian Defender contest with Templar Protocol: $100,000 award pool

Security firm Guardian has opened a Guardian Defender contest with Templar Protocol, with a $100,000 award pool funded by Guardian; Templar's Precept lending lets anyone create isolated lending pools on Stellar. The 30-day window opens October 26 and closes November 25, 2026, and participation details are in Guardian's post.

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Machine-Checked Devcon Week: online Lean 4 hackathon on Ethereum networking, $1,000 prize pool

Invisible Garden is running an online hackathon during Devcon week, 2 to 7 November 2026, where participants implement pieces of Ethereum's networking layer in Lean 4 and prove properties of what they build. Participation is free and curated, with a cohort of under ten contributors; acceptances are announced in the Invisible Garden Discord. Applications close 1 November 2026.

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Stellar Community Fund SCF #46 Build Awards: up to $150K in XLM per project

The Stellar Community Fund round SCF 46 is in its submission phase for Build Awards, which offer up to $150K in XLM per project, plus technical audits and access to accelerators and VCs. Teams submit an interest form and are invited to apply if eligible; the submission deadline is November 9, 2026.

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Zcash Coinholder-Directed Retroactive Grants Q4 2026 call for proposals

The program funds work that is already fully completed and publicly verifiable; anyone can submit their own work or nominate an individual, company or project. There is no fixed cap on request size, but grants above $50,000 require FPF KYC checks before disbursement. The program is funded by 12% of Zcash block rewards (ZIP 1016) plus initial capital from the Deferred Dev Fund Lockbox, and coinholders decide funding in a vote scheduled for December. Deadline to submit a proposal: November 13 at 20:00 UTC.

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Plether audit competition on Immunefi: $80,000 in USDC reward pools (Nov 2-15)

Immunefi is hosting an audit competition for Plether, an onchain protocol for trading and hedging the strength of the US dollar, with rewards paid in USDC from three pools: a $56,000 primary pool, a $16,000 All Stars pool and an $8,000 podium pool. A runnable proof of concept is required, and the competition runs from November 2, 2026 at 06:00 UTC to November 15, 2026 at 23:59 UTC.

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Tatum x Walrus Total Recall hackathon: $4,500 prize pool, online, closes Nov 10

Tatum and Walrus are running Total Recall, an online hackathon from 20 Oct to 10 Nov 2026 for building an app that remembers and improves over time, with a $4,500 prize pool across three tracks: Markets & Sports Prediction, Smart Agents for Real Life, and Consumer Finance Apps. Eligibility and the per-track split are not stated. Details and sign-up are on Tatum's hackathon page.

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Canton Dev Fund grants RedStone 15,775,000 CC (~$1.83M) for open-source CAPS pricing standard

The Canton Development Fund approved proposal 497 from RedStone to build the Canton Access and Privacy Standard (CAPS), an open-source, Daml-native standard for delivering reference prices on the Canton Network while keeping each institution's positions and deal terms private. The grant is set at 15,775,000 Canton Coin, calculated at a baseline of 1 CC = 0.1160 USD, paid across eight milestones over 12 months, with half of the payments tied to adoption milestones.

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BCH BLAZE 2026: online Bitcoin Cash hackathon, $8,000+ in prizes (register by Nov 13)

BCH BLAZE 2026 is an 8-day online hackathon for Bitcoin Cash builders, designers and entrepreneurs, hosted on DoraHacks, with prizes totaling $8,000+ (25 BCH), paid in ParyonUSD CashToken, and Mainnet and Media tracks plus sponsor bounties. Register solo or as a team of up to four by Nov 13; building runs Nov 14-22, and winners are announced at the Nov 28 showcase.

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NEAR Hackathon November 2026

NEAR Protocol's NEAR HACKATHON has $250K+ in prizes, paid in NEAR: a $55K grand prize plus thirteen 1st ($10K), 2nd ($3K) and 3rd ($2K) awards. No signup; ship a public repo and public demo post between November 1 and November 14, 23:59 UTC. Build on NEAR Intents, chain signatures, chain abstraction, NEAR AI Cloud and more.

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Uniswap Foundation Security Fund November 2026 cohort: up to 100% audit subsidies, apply by Nov 7

Projects building in the Uniswap ecosystem, including Uniswap v4 hooks and Uniswap Trading API integrations, can apply for up to 100% subsidy on audit costs, plus a pre-audit security scan and tooling suite, access to Areta's curated auditor marketplace, and competitive quotes and guidance from first scan to final report. The fund has supported 35+ projects in earlier cohorts. Apply by November 7, 2026, 23:59 UTC.

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Reactive Omni Buildathon: $5,500 in prizes, paid in REACT

Reactive Network is running the Reactive Omni Buildathon from November 5 to December 5, 2026, on DoraHacks, to test its new Omni version (CometBFT, ~1-second blocks), with three tracks: Every Second Counts (latency-sensitive DeFi on Unichain Sepolia and/or Base Sepolia; $2,000 first, $250 runner-up), Set It and Forget It (personal automations; $2,000 first, $250 runner-up) and Reactive Meets AI ($1,000 first). Repositories must be public and open source at submission.

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