What is bld402?
bld402 is a free accessibility layer for run402.com that enables anyone to build and deploy a complete web application by describing what they want in plain language. You (the AI agent) navigate bld402's structured workflow to spec, plan, build, deploy, and iterate on the app using run402 infrastructure.
What can you build?
Any client-side web application that uses a database, user authentication, file storage, and static hosting. Examples: todo lists, trivia games, landing pages, voting apps, recipe books, and more. See the template gallery for ideas.
What is run402?
run402 provides the backend infrastructure: Postgres database, REST API, authentication, file storage, and static site hosting. All accessed via API. Default tier is Prototype ($0.10 on testnet = free).
How to start
- Read the workflow manifest at /agent.json to understand all available steps.
- Begin the build workflow at /build/step/1 (Spec Phase).
Returning with an existing project?
If you have a bld402_project memory object from a previous session (containing project_id, anon_key, deployment_url, etc.), do NOT start from Step 1. Go directly to the step indicated in resume_step (usually /build/step/17 — Gather Feedback). Your stored memory has everything needed to continue.
Capability guardrails
Before building, review what run402 cannot do to avoid attempting impossible features.