Build a Spirit Pizza Topping Quiz with Codex and Momen BaaS

Cici Yu

·June 26, 2026

·2 min read

This showcase demonstrates building a personality quiz using Codex and Momen BaaS. Users answer five questions to discover their "spirit pizza topping" via AI analysis.

Momen BaaS is a visual, Postgres-native backend that AI coding tools and no-code builders plug into. You configure your data model, AI agents, and logic in the editor — it exposes a standard GraphQL API your frontend consumes. One backend, many frontends. AI builds your UI; Momen is the backend that survives production.

Live Demo: what-are-you-really-pizza-topping.vercel.app

Key Concept

The project separates concerns: backend infrastructure lives entirely in Momen using visual configuration, while Codex builds and deploys the frontend to Vercel. "The editor is the source of truth" — when changes sync, the API shape updates automatically.

What the System Does

App Features

Nickname entry with one-shot protection ("One shot only 😉")
Five database-driven quiz questions with preset options
Asynchronous AI agent mapping answers to spirit toppings
Result screen displaying topping name and summary
No user accounts or external payment systems

Data Model

Table	Purpose
`question`	Five quiz prompts
`option`	Answer choices with psychological context
`spirit_result`	Outcome catalog
`quiz_result`	Per-nickname results with unique constraint

Relations flow: question → option → quiz_result → spirit_result

AI Agent

The structured-output agent receives five option IDs and returns typed JSON: { spirit_result_id, result_name, result_summary }. Structured output prevents text parsing errors and maps directly to database columns.

Backend Logic

Two Actionflows coordinate operations:

check-username-status (sync): Validates nickname availability and reserves entry
CrownUser (async): Runs AI agent and updates results via WebSocket subscription

Integration Approach

Momen handles:

Tables and relations
Seed data import
AI agent configuration
Actionflow orchestration
GraphQL API deployment

Codex handles:

GraphQL query generation
Custom quiz UI
Vercel deployment

The Momen plugin gives Codex direct access to the live backend schema, eliminating guesswork about field names or API shapes:

# Codex
codex plugin marketplace add momen-tech-org/momen-nocode-plugin
codex plugin add momen-nocode@momen

Once the plugin is installed, Codex reads your tables, Actionflow inputs/outputs, and AI agent schemas directly. When you change the backend and sync, schema re-introspection keeps your frontend code in sync automatically.

Development Timeline

Phase	Time
Backend setup	~1 hour
Frontend development	~1 hour
Total MVP	~2 hours

Costs: Momen Pro (required for AI), Codex subscription, Vercel free tier, and per-agent-run AI points.

Key Technical Highlights

Schema introspection via the Momen plugin prevents incorrect field assumptions
Structured AI output maps directly to database columns
One-shot enforcement combines unique constraints with sync validation
Modularity — swap quiz topics by changing seed data and prompts only