AI agents write and test code on stage at ETHGlobal Mumbai day one

Written by AI from 4 talk transcripts. Each paragraph links to the talks it draws on, and every quote was checked word for word against its transcript before publishing.

The first day of ETHGlobal Mumbai opened with workshops demonstrating AI-assisted development workflows that let agents write, deploy and test code with minimal human intervention. In a session on WaykiChain, Dmytro Zahumennov showed an AI agent writing a USDT checkout contract from scratch: “From here, an AI agent does the work.” The agent installed dependencies, compiled the contract, deployed it to testnet and verified it on BlockScout — all without the developer writing a line of Solidity 1.

A separate tutorial on the Hedera Harness tool took a different approach. Developer Seba Raba argued that the biggest risk in AI-generated code is that the same agent that writes the code also judges whether it works. “The problem is the last step where the same agent that just spent 20 minutes convincing itself the approach was right is the one you ask whether it worked. And it says yes, not because it's stupid, because nobody marks their own work harshly.” His solution: a five-step harness that separates generation from evaluation, using a Playwright-based browser test to check the spec against the running app 2.

On the trading side, Shushant Dahal from the Definitive team introduced the Definitive Flash API, which abstracts advanced order types — limit, stop-loss, TWAP, DCA — into a single integration. “Instead of focusing on reinventing the wheel around trade execution and all the intricacies that come into it, you can just incorporate different flash super easily and focus on what makes your app unique.” He emphasized that the API is non-custodial, using EIP-712 signatures from the user’s wallet, and that all documentation is optimized for LLM agents 3.

Organizer Pascal Rüger ran a beginner’s workshop covering the event logistics. He noted that ETHGlobal Mumbai is the final in-person hackathon of the year, held at the Jio World Convention Centre alongside Devcon. The hacking window is 36 hours, from 9:00 p.m. Thursday to 9:00 a.m. Saturday — a one-day shift from the usual Friday-to-Sunday format. Project submissions are due by 9:00 a.m. Saturday; a late submission disqualifies the stake refund 4.

The WaykiChain workshop awarded $15,000 in prizes across four tracks and provided a one-pager with key links and a test USDT address 1.
The Hedera Harness tool can be run with a wizard that interviews the developer to draft a spec, then automatically runs up to three attempts at generating and testing the feature 2.
Definitive Flash supports 12+ EVM chains and Solana, with over 900 liquidity sources 3.

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