> 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-blockchain-api/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).<br>

```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"},{"url":"https://api.mainnet.hiro.so","description":"Hiro Mainnet API"},{"url":"https://api.testnet.hiro.so","description":"Hiro Testnet API"}],"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":{"type":"object","properties":{"attachment":{"type":"string","format":"byte","description":"The attachment data, hex-encoded."}},"required":["attachment"]}}}},"400":{"description":"Bad request","content":{"text/plain":{"schema":{"type":"string"}}}},"404":{"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.<br>

```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"},{"url":"https://api.mainnet.hiro.so","description":"Hiro Mainnet API"},{"url":"https://api.testnet.hiro.so","description":"Hiro Testnet API"}],"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}$"}},{"name":"pages_indexes","in":"query","required":true,"description":"Comma-separated list of page indexes to query","schema":{"type":"string","pattern":"^[0-9]+(,[0-9]+){0,7}$","description":"max 8 pages per request"}}],"responses":{"200":{"description":"Attachment inventory bitfield","content":{"application/json":{"schema":{"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}}}}}}}}}},"400":{"description":"Bad request","content":{"text/plain":{"schema":{"type":"string"}}}},"404":{"description":"Not found","content":{"text/plain":{"schema":{"type":"string"}}}}}}}}}
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.stacks.co/reference/api/stacks-blockchain-api/atlas.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
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