# 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":"Stacks Mainnet API"},{"url":"https://api.testnet.hiro.so","description":"Stacks 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":"Stacks Mainnet API"},{"url":"https://api.testnet.hiro.so","description":"Stacks 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}$"}},{"name":"pages_indexes","in":"query","required":true,"description":"Comma-separated list of page indexes to query.\n- Maximum 8 pages per request\n- Each index must be 0-4294967295 (u32 range)\n- Values outside u32 range return 400 Bad Request\n","schema":{"type":"string","pattern":"^[0-9]{1,10}(,[0-9]{1,10}){0,7}$"}}],"responses":{"200":{"description":"Attachment inventory bitfield","content":{"application/json":{"schema":{"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: Querying This Documentation

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

```
GET https://docs.stacks.co/reference/api/stacks-node-rpc/atlas.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.