ETHGlobal

ETHGlobal New York 2025

Flow

$20,000

About

Flow is a layer one blockchain with a powerful smart contract language (Cadence) and full EVM equivalence (any Solidity, smart contract, or protocol that works on Ethereum or an EVM L2 works on Flow). The network was designed from the ground up to enable consumer crypto applications that scale to mainstream audiences and seamlessly connect to digital ecosystems. It is based on a unique, multi-role architecture, and designed to scale without sharding, allowing for massive improvements in speed and throughput while preserving a developer-friendly, ACID-compliant environment. Flow has been architected with a clear vision for the future of consumer crypto, and meticulously designed to address the shortcomings of earlier blockchains to ensure scalability, usability, and efficiency are not simply an afterthought. By incorporating critical protocol-level primitives, such as account abstraction and on-chain randomness, as well a powerful transaction model and scalability without sharding, Flow sets itself apart as a blockchain made for those interested in building apps for widespread adoption and developer-friendly innovation.

Prizes

🚀 Best Killer App on Flow ⸺ $6,000

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1st place

$3,500

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2nd place

$1,500

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3rd place

$1,000

Consumer-oriented “killer apps” have the power to define and lead entire industries by solving real user pain points at scale. Think of how ChatGPT made AI accessible to hundreds of millions. Flow is designed for mass adoption and consumer-grade experiences, so we’re looking for the next breakthrough application that can capture the interest of millions (or billions!) of everyday users. This is a very broad bounty and eligible projects include everything from AI Agents and RWA to games and social apps.

Qualification Requirements

• Deploy a smart contract or run transactions on Flow Testnet or Flow Mainnet • Must have a README.md and state the project is built on Flow, specify testnet or mainnet, and list the deployed or used contract address(es). Submissions missing these details in the README.md risk being disqualified.

Links and Resources

Developer Docs

https://developers.flow.com/

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Flow EVM Block Explorer (Testnet)

https://evm-testnet.flowscan.io/

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Flow EVM Block Explorer (Mainnet)

https://evm.flowscan.io/

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Flow Cadence Block Explorer

https://flowscan.io/

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Flow Testnet Faucet: Fund Account

https://faucet.flow.com/fund-account

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RPC Endpoint

https://developers.flow.com/evm/using

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Video: Deploy on Flow in less than 3 minutes

https://drive.google.com/file/d/13orUMRKrkdNgxuI6sY92lmVD5t5k4mTF/view?usp=sharing

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🔥 Best Use of Actions & Agents on Flow ⸺ $4,000

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1st place

$2,000

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2nd place

$1,000 ×2

Flow Actions (FLIP-338) are a brand-new standard that turn protocol logic into self-contained, reusable onchain building blocks you can call without importing ABIs, reading contract code, or writing brittle glue scripts. Each Action is a trustless workflow with clear metadata, built-in safety checks, atomic execution, and verifiable success criteria—think standardized onchain APIs that plug together like Lego bricks. For AI agents, this means instant discovery of available protocols, safe composition of complex workflows, and full automation without off-chain keepers or MCP servers. This bounty is calling on builders to push the boundaries by creating new connectors to major protocols, chaining cross-protocol workflows, integrating Actions into games, integrating fully onchain agents with actions, or making tools that help others discover and use useful Actions. Whether you’re into DeFi, gaming, or novel automation, this is your chance to shape the future of composability and define how agents interact with Web3.

Qualification Requirements

• Use the Flow Actions OR scheduled callbacks/transactions on Flow in your project • Must have a README.md and state the project is built on Flow

Links and Resources

FLIP-338 Flow Actions

https://github.com/onflow/flips/blob/gio/flip-338-defi-actions/application/20250730-flow-actions-defi.md

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Scheduled Callbacks scaffold

https://github.com/onflow/scheduledcallbacks-scaffold

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Flow Actions Tutorials

https://developers.flow.com/tutorials/defi

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🌊 Flow Builder Pool Prize ⸺ $10,000

Split with up to 66 teams (capped at $152 per team)

Ship anything on Flow mainnet or testnet. Deploy a contract or send a transaction on Flow. If you interact with the Flow network during the hackathon, you're in. Did you know that last month $420k was funded into various projects that built on Flow? Most of that funding went to projects that hacked on Flow before but did not manage to win top prizes. Hackathons are just the beginning of your support, when you find your Flow State, everything flows!