---
title: MatchDay
emoji: ⚽
colorFrom: blue
colorTo: green
sdk: gradio
app_file: app.py
pinned: true
license: mit
tags:
  - build-small-hackathon
  - backyard-ai
  - agents
  - react-agent
  - tool-use
  - nemotron
  - nvidia
  - modal
  - gradio
  - fifa-world-cup-2026
  - travel
models:
  - nvidia/NVIDIA-Nemotron-3-Nano-30B-A3B-BF16
---

# MatchDay ⚽ — 2026 FIFA World Cup, Vancouver

MatchDay is a Layla.ai-style **travel-intelligence agent** with one job: get you
to a 2026 FIFA World Cup match in Vancouver with the **cheapest flight, the
safest arrival, and a hotel closest to BC Place — explained, not just listed.**

Say *"Flying from Montreal, want Canada vs Qatar, mid-range, June 26-29"* and
MatchDay's agent builds **3 ranked, scored packages** (flights · hotels ·
weather · what's near the stadium) on an interactive Leaflet map, each price
tagged with **honest provenance** — `● live` vs `example` — so nothing is
hallucinated.

## How it works — Brain + Hands
- **Brain:** **NVIDIA Nemotron-3-Nano-30B-A3B-BF16** — a 30B-total / **3B-active**
  Mixture-of-Experts model, served on **Modal A100** via SGLang. It selects tools,
  reasons, and writes the explanations. **It never calls an API or names a price.**
- **Hands:** deterministic Python calls the APIs (flights, hotels, weather, POIs),
  scores packages with a fixed cost / arrival-buffer / stadium-proximity formula,
  and attaches provenance to every value.
- **Loop:** a bounded ReAct agent (≤5 tool rounds). Nemotron decides the sequence,
  the hands execute, results return — Nemotron-3-Nano emits structured tool calls
  via SGLang's `qwen3_coder` + `nemotron_3` parsers.

## Why this is "small"
Nemotron-3-Nano-30B is a MoE — only **~3B parameters activate per token**, so the
reasoning path is genuinely lean. Heavy 30B inference runs **remotely on Modal**
(sanctioned hackathon compute); the Gradio Space itself stays lightweight.

## Tech
Nemotron-3-Nano-30B-A3B (3B-active MoE) · Modal A100-80GB (SGLang v0.5.12,
`qwen3_coder`+`nemotron_3`) · **gradio.Server** custom frontend (streaming chat +
Leaflet map + day-by-day timeline — not stock Gradio) · SerpApi (Google
Flights/Hotels/Search) · Open-Meteo · OpenStreetMap · httpx/Pydantic v2.

## Try it
- **Live Space:** https://huggingface.co/spaces/build-small-hackathon/matchday
- **Agent trace (Sharing-is-Caring):** https://huggingface.co/datasets/build-small-hackathon/matchday-agent-traces
- **Field Notes (architecture story):** `matchday/FIELD_NOTES.md`

## Built for Build Small
**Track: Backyard AI.** Sponsor tools used: **Nemotron-3-Nano-30B (NVIDIA)** +
**Modal** (noted here per the Modal-prize requirement; Modal A100 is the runtime).

Targeting:
- 🟩 **NVIDIA Nemotron** — Nemotron-3-Nano-30B-A3B is the Brain.
- 🟢 **Modal** ($10k/7k/3k) — Modal A100 serves the model.
- 🤖 **Best Agent** — bounded multi-step tool use, ≤32B.
- 🎨 **Off-Brand** — `gradio.Server` custom UI well beyond stock Gradio.
- 📡 **Sharing-is-Caring** — agent trace on the Hub (link above).
- 📓 **Field Notes** — architecture blog (`matchday/FIELD_NOTES.md`).
- 🏆 **Bonus Quest Champion** + 🎬 **Best Demo** + 🗳️ **Community Choice**.

## Social
**Post:** <paste your social post URL here> (REQ-04 — link your post, then redeploy).
A ready-to-post draft is in `matchday/SOCIAL_POST.md`.