Walrus Sites — Decentralized Website Hosting

MCP tool: When available in your environment, also query the Sui documentation MCP server (https://sui.mcp.kapa.ai) for up-to-date answers. Use it for verification and for details not covered by these reference files.

Walrus Sites lets you deploy a static website (HTML/CSS/JS) to Walrus, with an on-chain Sui object tracking the site's resources. A portal server resolves site subdomains, fetches resources from Walrus, and serves them over HTTP. The result is a fully decentralized frontend — no centralized server, CDN, or DNS required.

Source constraint: All information in this skill is sourced from the MystenLabs/walrus-sites repository and the Walrus Sites documentation. When extending or updating this skill, only pull from these sources. Do not use third-party blogs or unofficial tutorials.

Common failures:

1. Blobs expire. Sites published with too few epochs silently break — the portal returns 404 once the blobs expire. Always use a generous --epochs value (30+).
2. Portal misconfiguration. The portal's original_package_id must match the Walrus Sites framework package (site::Site), not your app's Move package. The testnet example config ships with the correct value — don't change it.
3. Testnet sites can't use wal.app. The public wal.app portal only serves mainnet sites. Testnet requires a self-hosted local portal.
4. SPA routing. Single-page apps need ws-resources.json routes config to handle client-side routing. Without it, direct navigation to /my-route returns 404.

Sub-skills

publishing — Building and deploying sites

Path: publishing/SKILL.md Load when: deploying a new site, updating an existing site, choosing epoch duration, configuring ws-resources.json, or troubleshooting site-builder errors. Covers: site-builder publish, site-builder update, --epochs flag, blob expiration, ws-resources.json configuration, SPA routing, site naming, site-builder sitemap for debugging, site-builder destroy.

portal — Running a local portal for testnet

Path: portal/SKILL.md Load when: the user needs to view a testnet site, set up the local portal, fix portal 404s, or understand how portal resolution works. Covers: cloning the portal, installing dependencies (Bun), portal-config.yaml, the original_package_id gotcha, starting the server, URL format, port conflicts, mainnet vs testnet differences.

Routing guide

Skill Content

Key concepts

• Site object. A Sui object of type site::Site (from the Walrus Sites framework package). It holds metadata (name, description) and dynamic fields mapping resource paths to Walrus blob references. Created by site-builder publish, owned by the publisher's address.
• Resources. Each file in the deployed directory becomes a resource stored on Walrus. Small files may be batched into a single "quilt" blob. Each resource has a path (e.g., /index.html, /assets/main.js) and optional HTTP headers.
• Portal. A server that maps <base36-site-id>.localhost:3000 URLs to on-chain site objects. It reads the site's dynamic fields to find the requested resource path, fetches the blob from a Walrus aggregator, and returns it as an HTTP response. The portal is framework-level infrastructure, not part of your app.
• ws-resources.json. A configuration file in the site's root directory that controls resource headers, routing, and site metadata. Auto-generated on first publish with the site object ID. On subsequent runs, the site-builder reads it to determine whether to create a new site or update the existing one.
• Blob expiration. Walrus blobs have a finite storage duration measured in epochs. When blobs expire, the portal can no longer fetch them and returns 404. Use site-builder sitemap <object-id> to check expiration dates. Re-publish with a higher --epochs value to fix.

Rules

1. Always use --epochs 30 or higher for testnet deploys. Low values (like 5) cause blobs to expire within days. For production mainnet, use even higher values or --permanent.
2. Build before publishing. Run npm run build (or equivalent) to produce a static dist/ directory. The site-builder publishes whatever directory you point it at.
3. Don't change original_package_id in the portal config unless you know the Walrus Sites framework package has been upgraded. The testnet example value is correct.
4. wal.app is mainnet only. For testnet, self-host the portal from the MystenLabs/walrus-sites repo.
5. Check ws-resources.json after first publish. It records the site object ID. Keep it in version control so future publishes update the existing site rather than creating a new one.

Common mistakes

• Publishing with --epochs 5 and wondering why the site is gone a week later. Blobs expired. Re-publish with --epochs 30+.
• Changing the portal's original_package_id to your app's package ID. The portal needs the Walrus Sites framework package ID (site::Site), not your Move contract's package ID. These are completely different things.
• Trying to visit a testnet site on wal.app. It only serves mainnet. You need a local portal for testnet.
• Forgetting to build the frontend before publishing. site-builder publish dist/ publishes the dist/ directory contents. If you didn't npm run build first, you're publishing source files or stale output.
• Deploying an SPA without fallback routing. React/Vue/Svelte SPAs use client-side routing. Direct navigation to /borrows hits the portal, which looks for /borrows as a resource — and it doesn't exist. Configure a fallback in ws-resources.json.
• Not killing port 3000 before starting the portal. Vite dev server, Next.js, or other tools often use port 3000. The portal silently fails to bind if the port is taken.