Walrus Quilts

Source constraint: All information in this skill is sourced from the Walrus quilt CLI documentation and quilt HTTP API documentation. When extending this skill, only pull from these sources.

A quilt batches multiple blobs into a single Walrus storage unit, significantly reducing overhead and cost for storing many small files. Individual blobs within a quilt are retrieved by their QuiltPatchId or identifier, not their standard BlobId.

All patterns in this skill are derived from:

• https://docs.wal.app/docs/walrus-client/quilts
• https://docs.wal.app/docs/http-api/quilt-http-apis

If unsure about any quilt operation, fetch the relevant page before answering.

Related skills

Skill Content

Key concepts

• Quilt. A single Walrus storage unit that contains multiple blobs. On-chain, a quilt is represented as one Blob Sui object. Storage cost is based on the total quilt size, not per-blob, which saves overhead for many small files.
• QuiltPatchId. A unique ID for each blob within a quilt. It is derived from the quilt contents, so a blob's QuiltPatchId changes if the quilt is recreated with different contents. This is not the same as a standard BlobId.
• Identifier. A human-readable name for a blob within a quilt (for example, the filename). Identifiers must be unique within a quilt and cannot start with _. The field name _metadata is reserved for Walrus-native metadata.
• Lifecycle applies to the whole quilt. You cannot delete, extend, or share individual blobs inside a quilt. Operations like delete, extend, and share apply to the entire quilt.

CLI: Storing quilts

Store from directories with --paths

# Store all files from a directory recursively
walrus store-quilt --epochs 5 --paths ./my-assets/

# Store from multiple directories
walrus store-quilt --epochs 10 --paths ./images/ ./documents/ ./data.json

Filenames become identifiers. All identifiers must be unique within the quilt. Glob patterns are supported.

Store with custom identifiers and tags using --blobs

walrus store-quilt \
  --blobs '{"path":"photo.jpg","identifier":"walrus","tags":{"color":"grey","size":"medium"}}' \
         '{"path":"icon.png","identifier":"seal","tags":{"color":"grey","size":"small"}}' \
  --epochs 5

If identifier is omitted or null, the filename is used.

Lifetime options

Same as regular walrus store: --epochs, --earliest-expiry-time, or --end-epoch.

CLI: Reading from quilts

Read by identifiers

walrus read-quilt --out ./downloads/ \
  --quilt-id <QUILT_BLOB_ID> --identifiers walrus.jpg another-walrus.jpg

Read by tags

# Download all blobs tagged with species=cat
walrus read-quilt --out ./downloads/ \
  --quilt-id <QUILT_BLOB_ID> --tag species cat

Read by QuiltPatchId

walrus read-quilt --out ./downloads/ \
  --quilt-patch-ids <PATCH_ID_1> <PATCH_ID_2>

List all patches in a quilt

walrus list-patches-in-quilt <QUILT_BLOB_ID>

Returns all patches with their identifiers and QuiltPatchId values.

HTTP API: Storing quilts

Store quilts via multipart form upload to the publisher:

# Store 2 files with custom identifiers
curl -X PUT "$PUBLISHER/v1/quilts?epochs=5" \
  -F "contract-v2=@document.pdf" \
  -F "logo-2024=@image.png"

The form field name becomes the identifier. All regular blob query parameters (epochs, permanent, deletable, send_object_to) also work for quilts.

Store with Walrus-native metadata tags

curl -X PUT "$PUBLISHER/v1/quilts?epochs=5" \
  -F "quilt-manual=@document.pdf" \
  -F "logo-2025=@image.png" \
  -F '_metadata=[
    {"identifier": "quilt-manual", "tags": {"creator": "walrus", "version": "1.0"}},
    {"identifier": "logo-2025", "tags": {"type": "logo", "format": "png"}}
  ]'

Store response

The response includes the quilt blobId and individual storedQuiltBlobs with quiltPatchId values:

{
  "blobStoreResult": {
    "newlyCreated": {
      "blobObject": {
        "id": "0xe6ac...bc02",
        "blobId": "6XUOE-Q5-nAXHRifN6n9nomVDtHZQbGuAkW3PjlBuKo",
        "size": 1782224,
        "storage": { "startEpoch": 103, "endEpoch": 104, "storageSize": 72040000 },
        "deletable": false
      },
      "cost": 12075000
    }
  },
  "storedQuiltBlobs": [
    { "identifier": "another_walrus.jpg", "quiltPatchId": "6XUOE-...BAQD..." },
    { "identifier": "walrus.jpg", "quiltPatchId": "6XUOE-...B0AB..." }
  ]
}

HTTP API: Reading from quilts

# Read by QuiltPatchId
curl "$AGGREGATOR/v1/blobs/by-quilt-patch-id/<PATCH_ID>"

# Read by quilt ID + identifier
curl "$AGGREGATOR/v1/blobs/by-quilt-id/<QUILT_BLOB_ID>/walrus.jpg"

Only one blob per request is supported currently. Bulk retrieval from a quilt in a single request is not yet available.

Response headers

Both methods return raw blob bytes. Metadata is returned as HTTP headers:

• X-Quilt-Patch-Identifier: The blob's identifier within the quilt
• ETag: The patch ID or quilt ID for caching

When to use quilts vs individual blobs

The per-blob metadata overhead means storing a 1 KB JSON blob individually costs about the same as storing a 64 MB file. Quilts eliminate this by packing everything into one storage unit.

Rules

1. Identifiers must be unique within a quilt. Duplicate identifiers cause the store operation to fail.
2. Identifiers cannot start with _. The _metadata field name is reserved for Walrus-native metadata.
3. Lifecycle operations apply to the entire quilt. You cannot delete, extend, or share individual blobs inside a quilt.
4. QuiltPatchId is not a BlobId. A blob's QuiltPatchId is specific to the quilt it belongs to. The same file content in a different quilt gets a different QuiltPatchId.
5. Use quilts for many small files. Quilts reduce per-blob overhead. For a single large file, use regular walrus store.
6. Content-addressing still applies. The same quilt content always produces the same quilt blob ID.

Common mistakes

• Trying to delete a single blob from a quilt. You must delete the entire quilt. Individual blobs cannot be removed.
• Using a BlobId to read from a quilt. Blobs within a quilt are identified by QuiltPatchId or identifier, not standard BlobId.
• Duplicate filenames across directories. When using --paths with multiple directories, if two files have the same name, the identifiers collide and the store fails.
• Expecting bulk HTTP reads. Currently only one blob per HTTP request is supported for quilt reads.
• Storing many small blobs individually instead of as a quilt. This is the most common cost mistake. Each individual blob incurs ~64 MB of metadata overhead. A batch of 100 small JSON files stored individually costs roughly 100x more than quilting them together.