> For the complete documentation index, see [llms.txt](https://docs.stacks.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stacks.co/reference/api/stacks-node-rpc/atlas.md).
# Atlas
Operations related to the Atlas global namespace.
## Get attachment by hash
> Get an attachment by its hash. Attachments are content stored in the Atlas network.\
> \
> The attachment hash is a 40-character hex string (SHA-1 hash).
```json
{"openapi":"3.1.0","info":{"title":"Stacks 3.0+ RPC API","version":"1.0.0"},"tags":[{"name":"Atlas","description":"Operations related to the Atlas global namespace."}],"servers":[{"url":"http://localhost:20443","description":"Local Stacks Node"}],"security":[],"paths":{"/v2/attachments/{hash}":{"get":{"summary":"Get attachment by hash","tags":["Atlas"],"operationId":"getAttachment","description":"Get an attachment by its hash. Attachments are content stored in the Atlas network.\n\nThe attachment hash is a 40-character hex string (SHA-1 hash).\n","parameters":[{"name":"hash","in":"path","required":true,"description":"Hex-encoded SHA-1 hash of the attachment (40 characters)","schema":{"type":"string","pattern":"^[0-9a-f]{40}$"}}],"responses":{"200":{"description":"The attachment content","content":{"application/json":{"schema":{"$ref":"#/components/schemas/AttachmentData"}}}},"400":{"$ref":"#/components/responses/BadRequest"},"404":{"$ref":"#/components/responses/NotFound"}}}}},"components":{"schemas":{"AttachmentData":{"type":"object","properties":{"attachment":{"type":"string","format":"byte","description":"The attachment data, hex-encoded."}},"required":["attachment"]}},"responses":{"BadRequest":{"description":"Bad request","content":{"text/plain":{"schema":{"type":"string"}}}},"NotFound":{"description":"Not found","content":{"text/plain":{"schema":{"type":"string"}}}}}}}
```
## Get attachment inventory
> Get inventory of attachments for a given index block hash and page range.\
> This returns a bitfield indicating which attachments are available.
```json
{"openapi":"3.1.0","info":{"title":"Stacks 3.0+ RPC API","version":"1.0.0"},"tags":[{"name":"Atlas","description":"Operations related to the Atlas global namespace."}],"servers":[{"url":"http://localhost:20443","description":"Local Stacks Node"}],"security":[],"paths":{"/v2/attachments/inv":{"get":{"summary":"Get attachment inventory","tags":["Atlas"],"operationId":"getAttachmentsInventory","description":"Get inventory of attachments for a given index block hash and page range.\nThis returns a bitfield indicating which attachments are available.\n","parameters":[{"name":"index_block_hash","in":"query","required":true,"description":"Hex-encoded index block hash (64 characters)","schema":{"type":"string","pattern":"^[0-9a-f]{64}$"}},{"name":"pages_indexes","in":"query","required":true,"description":"Comma-separated list of page indexes to query.\n- Maximum 8 pages per request\n- Each index must be 0-4294967295 (u32 range)\n- Values outside u32 range return 400 Bad Request\n","schema":{"type":"string","pattern":"^[0-9]{1,10}(,[0-9]{1,10}){0,7}$"}}],"responses":{"200":{"description":"Attachment inventory bitfield","content":{"application/json":{"schema":{"$ref":"#/components/schemas/AttachmentInventory"}}}},"400":{"$ref":"#/components/responses/BadRequest"},"404":{"$ref":"#/components/responses/NotFound"}}}}},"components":{"schemas":{"AttachmentInventory":{"type":"object","properties":{"block_id":{"type":"string","description":"Index block hash"},"pages":{"type":"array","items":{"type":"object","properties":{"index":{"type":"integer","description":"Page index"},"inventory":{"type":"array","description":"8-byte bitfield for the page (array of integers 0-255)","items":{"type":"integer","minimum":0,"maximum":255}}}}}}}},"responses":{"BadRequest":{"description":"Bad request","content":{"text/plain":{"schema":{"type":"string"}}}},"NotFound":{"description":"Not found","content":{"text/plain":{"schema":{"type":"string"}}}}}}}
```
---
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