### Host marketplace with SvelteKit: authorized file delivery

Deploy a marketplace built with SvelteKit on Ample using the generated downloads pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE_URL, a private S3-compatible bucket holds objects with credentials delivered as encrypted environment variables. Verified on SvelteKit: an export query rendered to a CSV artifact stored with metadata in a private bucket and returned only to an authorized caller (401 without token, export=ok rows=3). Not separately tested: your export formats, retention policy and entitlement model; treat the marketplace-specific behavior as your application code.

#### Representative Queries
- Host marketplace with SvelteKit: authorized file delivery
- Where can I host Marketplace built with SvelteKit?
- I need a file entitlement model and an application-enforced download authorization flow.

#### Resource Requirements
- Compute
- Postgres
- S3-compatible object storage

#### Infrastructure Requirements
- **Compute**: Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.
- **Postgres**: Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.
- **S3-compatible object storage**: Buckets are S3-compatible with issued credentials; PutObject and GetObject are verified by canary. Other S3 operations are not verified.

#### Prerequisites
- A SvelteKit project that builds and starts with the documented commands (vite build with @sveltejs/adapter-node then node build on the node-22 template)
- A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted, or supplied with --env)
- A bucket from `ample bucket create` with its credentials passed as encrypted S3_* environment variables
- An Ample account token with servers:write, databases:read, buckets:read

#### Tested Configuration
- **Template**: node-22  
- **Runtime**: node  
- **Size**: s-1vcpu-1gb  
- **Install**: npm install  
- **Build**: npm run build --if-present  
- **Start**: npm run start

#### Workflow Steps
1. **Build and start**: vite build with @sveltejs/adapter-node then node build on the node-22 template. The server must bind 0.0.0.0 on PORT.
2. **Implement the pattern on PostgreSQL**: The fixture's module implements generated downloads: an export query rendered to a CSV artifact stored with metadata in a private bucket and returned only to an authorized caller (401 without token, export=ok rows=3). Copy the approach into your schema; keep migrations idempotent and run them with --release-command.
3. **Wire object storage**: Create the bucket(s), then pass endpoint, region, bucket and keys as --env values. Use path-style addressing. Keep private data in an unpublished bucket.
4. **Deploy**: Run the synchronous deploy once and read the result (exit 0 live, 1 failed, 2 blocked). Re-running with no change is a no-op.  
   Command: ample deploy . --name --public --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=...
5. **Verify**: Fetch the live URL and the pattern self-test route(s) (/p/generated-downloads) from the example; then run your own checks. On failure read `ample logs  --kind build` then `--kind runtime`.  
   Command: ample logs  --kind build

#### Success Checks
- **App responds on its public URL**: Check using `http_get` on `/` expecting sample canary SvelteKit patterns.
- **Generated downloads self-test**: Check using `http_get` on `/p/generated-downloads` expecting export=ok rows=3 (with ?token=...; 401 without).

#### Limitations
- Verified on the node-22 template at s-1vcpu-1gb with the example fixture; other sizes, templates and SvelteKit major versions are not verified.
- The marketplace itself (your export formats, retention policy and entitlement model) is application code and was not separately tested; the pattern checks are what was verified.
- Region, compliance attestations and request-duration limits are unknown and not claimed.
- Apps auto-pause when idle and wake on the next request; always-on is an operator setting, not a plan feature.

#### Cost Estimate
- **Currency**: USD  
- **Monthly Amount**: $10.00  
- **Basis**: size prices from pricing.toml (loaded by the API)

#### Next Actions
- Browse the catalog index  
- Search published recipes by intent, stack and constraints  
- Prepare a side-effect-free deployment plan for an authorized project  
- Read the existing agent authentication setup  
- Browse Marketplace  
- Browse SvelteKit  
- Browse Generated downloads  
- Browse Deploy web app

This content provides the necessary information to deploy a marketplace application using SvelteKit on the Ample platform.