EAG Global Buildathon · Cali
More than 25 hackers and 13 projects in under 48 hours, building frontier applications with Ethereum, artificial intelligence, smart devices and open-source software.
20 September 2026 · SIDOC Auditorium — Universidad Icesi
EAG
Five projects, 200 USDT each, paid on Ethereum mainnet.
Marketing agents that evolve, capped on-chain
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Team
You give it a product and a budget. The system creates a population of agents, each with a different strategy and its own wallet with an enforced spending cap. The ones that lose money are eliminated; the profitable ones reproduce with mutations and pass their unspent budget to their offspring. The cap is not a line in a prompt — the contract enforces it.
Ethereum middleware for risk, compliance and wallets
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Open-source middleware that watches corporate transfers registered on-chain and scores them in real time against deterministic velocity and volume rules. It returns a risk verdict — alto, medio, bajo — over CLI, API and WebSocket, with the auditable evidence behind it.
Agentic playlist pitching
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A shelf that charges. A curator opens a playlist priced by position — spot 1 costs 10 USDC, sliding down to 1 — and agents query what is free, submit a track and get a receipt through an HTTP 402 payment challenge on Base Sepolia. It is the last mile between a finished track and anyone hearing it.
You get paid for the electricity you don't use when the grid needs it
Also place 1 on the HashKey Chain trackTracks
Team
Between 6 and 9 in the evening, wholesale power in Colombia costs 1.5 to 1.8 times the daily average. Minga Grid lets a small business commit to cutting its consumption in that window, verifies the result against its baseline using signed smart-meter readings, and settles the payment by itself. Operational friction was what kept small participants out.
Traceability and verified payment for medicines
Also place 2 on the HashKey Chain trackTracks
An ESP32 carrying temperature, acceleration and motion sensors travels with the batch. The readings pass through a gateway that signs them before writing them to a contract on HashKey Chain Testnet, which keeps the batch history and releases the escrowed payment only if the shipment arrived in condition. If the cold chain broke, the money does not move.
HashKey Chain
Title sponsor of the weekend, with a track of its own and 1,000 USDT across three places, judged separately from the EAG prize.
You get paid for the electricity you don't use when the grid needs it
Also EAG's place 4Tracks
Team
Between 6 and 9 in the evening, wholesale power in Colombia costs 1.5 to 1.8 times the daily average. Minga Grid lets a small business commit to cutting its consumption in that window, verifies the result against its baseline using signed smart-meter readings, and settles the payment by itself. Operational friction was what kept small participants out.
Traceability and verified payment for medicines
Also EAG's place 5Tracks
An ESP32 carrying temperature, acceleration and motion sensors travels with the batch. The readings pass through a gateway that signs them before writing them to a contract on HashKey Chain Testnet, which keeps the batch history and releases the escrowed payment only if the shipment arrived in condition. If the cold chain broke, the money does not move.
Autonomous agent economy, x402 machine payments
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Payment infrastructure for agents on HashKey Chain: micropayments negotiated and settled machine to machine over HTTP 402, selective credential disclosure with zero-knowledge proofs, and hardware-anchored delivery verification. It tokenises specialty Colombian coffee micro-lots as the real asset on the other end.
Prizes stacked: 2 of the three are also among EAG's winners.
Ethereum Foundation
The Ethereum Foundation is contributing Devcon VIII tickets for winners through the Road to Devcon programme, valued at 499 USD each. Not yet allocated; they will be published here when they are.
Meet more projects that also took part in this event and shipped exciting ideas from Cali. Projects on the real technological frontier!
Ticketing without fraud or scalping
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The ticket is a cryptographic QR generated from the attendee wallet that expires in seconds, so a screenshot is worth nothing. Resale runs through a contract with a price cap and automatic royalties to the organiser, and the attendee never has to understand the chain to use it.
Paid only for water that verifiably met the law
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Microalgae wastewater treatment, where whoever produces the compliance evidence is also the one paid for it. The contract does not accept removal percentages: it takes the raw influent and effluent readings and derives the efficiency itself, applies the regulatory threshold and releases payment with compliance. A batch that fails is recorded as failed, permanently.
Direct donations, with no intermediary holding the money
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The donor sends USDT straight to a verified cause, with no platform taking custody or a cut. An agent evaluates the evidence behind the cause and signs the verification on-chain only if its confidence clears 0.80; all of it is anchored on HSK Chain testnet so it can be audited.
Pay simple. Stay in control.
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The merchant writes the charge the way they would say it: "charge Ana $15 for the blue shirt". The agent reads it, generates the QR and watches for confirmation on chain. The wallet is non-custodial — the keys never leave the phone.
Satellite observation of territory
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It crosses the official Parque Tayrona polygon with Sentinel-2 and NDVI observations to flag possible changes in land cover. It does not present the satellite signal as a conclusion: it turns it into a workflow a person can read and validate — territory, observation, alert, validation, evidence.
Helps ideas become real
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An agent that turns an idea into a fundable, verifiable project: it finds the grants and investors that fit, and proves what the project claims cryptographically without exposing the data behind it. The agent proposes; authorising a payment is not among its permissions.
Micro mining pools, split fairly
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It splits revenue and costs between the partners in a small pool by weighing effective hashrate against uptime, not the hardware anyone claims to have. The contract settles and the funds sit in a multisig Safe, so no partner can drain the pot. Live on HSK Chain Testnet with 93 contract tests and 142 engine tests.
