# Citations so far (`mttr_citations`)

Updated October 24, 2026.

## What does mttr_citations do?

What assistants were found to cite for a site, question by question, from the lookups already made, and the credits left for more. It costs nothing. A key may make this call on the sites it has claimed.

Who may call it: Your claimed sites.

## When to use it

- Before asking an assistant anything new.
- You want to know where a site is cited.

## What you ask

You might say: “Where is example.com cited so far?”

```
mttr_citations({ site: "example.com" })
```

| Argument | Type | Needed | What it is |
| --- | --- | --- | --- |
| `site` | Text | Yes | The site, as a domain such as example.com. |

## What comes back

- Each question with what each assistant cited.
- The credits left, and the price of a new lookup.

A sample, with made-up sites and figures:

| Question | Cited | Named only |
| --- | --- | --- |
| Septic pumping near me | 1 of 3 | 1 of 3 |
| How to clear a drain | 0 of 3 | 0 of 3 |

## Over HTTP

```
curl "https://mttr.si/api/v1/sites/example.com/citations" \
  -H "Authorization: Bearer $MTTR_KEY"
```

## When it fails

| When | Status | What to do |
| --- | --- | --- |
| Your assistant has no key yet | 401 over MCP | Sign up with `mttr_signup`, then connect again with the key it gives. |
| The key has not claimed the site | 404 | Claim it with `mttr_claim`, then `mttr_claim_check`. |

## Sources

- [Model Context Protocol: tools](https://modelcontextprotocol.io/specification/2025-06-18/server/tools), Model Context Protocol: How an assistant calls a tool.

The call in full: [mttr_citations in the API reference](https://mttr.si/docs/reference#mttr_citations).

## Goes with

- [Ask the assistants](https://mttr.si/docs/tools/cite.md)
- [Searches](https://mttr.si/docs/tools/queries.md)