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Documentation Index

Fetch the complete documentation index at: https://docs.getmatter.com/llms.txt

Use this file to discover all available pages before exploring further.

Every resource in the API has a prefixed string ID and an object field that tells you its type.

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ID format

IDs are opaque strings with a type prefix:
ResourcePrefixExample
Accountact_act_k8x2m
Itemitm_itm_r9f3a
Annotationann_ann_m2k8v
Tagtag_tag_n5j2x
Authoraut_aut_p4w7q
Reading Sessionrs_rs_k8x2m
The prefix tells you the resource type at a glance, which is helpful when debugging or reading logs.

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Object types

Every response includes an object field identifying the resource type: 
{
  "object": "item",
  "id": "itm_r9f3a",
  "title": "How to Do Great Work"
}
For lists: 
{
  "object": "list",
  "results": [
    { "object": "item", "id": "itm_r9f3a" },
    { "object": "item", "id": "itm_x7k2p" }
  ],
  "has_more": false,
  "next_cursor": null
}
This makes it safe to handle polymorphic responses — you can always check object to know what you’re looking at.

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Timestamps

All timestamps are ISO 8601 strings in UTC: 
2026-03-30T18:30:00Z
Use these fields for sync, sorting, and display. See incremental sync for how to use updated_at to efficiently stay in sync.