What does 200 mean on GET /corroborate?

Distinct hosts carrying the story, grouped and ranked by authority.

What does 401 mean on GET /corroborate?

Missing, unknown or revoked key. A key minted moments ago can answer 401 until it propagates to the serving fleet.

What does 429 mean on GET /corroborate?

Over the per-minute rate (spent in credits), or a hard-capped key without the credits this call costs. `retry-after` is present on the rate-limit case only.

How many independent sources say this?

get /corroborate

Request

curl \
  -H "x-api-key: $UNLOB_API_KEY" \
  "https://api.unlob.com/corroborate?id=<id>"

Behaviour

Returns the DISTINCT hosts carrying this passage's story, grouped by source and ranked by host authority, and counts them.

The anti-hallucination check: one echoed rumour and an independently reported fact look identical in a result list, and different here. `independent_sources` counts every host that asserted the story, including hosts whose copy was folded into this one as a near-duplicate.

Check it before you state something as established.

Costs 2 credits; a call that runs and fails costs 1.

Parameters

Name	Type	Description
`id`required	string	Passage id to corroborate.
`limit`	integer	Maximum passages per source, default 10, maximum 100.

Responses

Status	Meaning
`200`	Distinct hosts carrying the story, grouped and ranked by authority.
`401`	Missing, unknown or revoked key. A key minted moments ago can answer 401 until it propagates to the serving fleet.
`429`	Over the per-minute rate (spent in credits), or a hard-capped key without the credits this call costs. `retry-after` is present on the rate-limit case only.

The same call over MCP

This capability is corroborate on the MCP server, taking the same parameters and returning the same body. A parity test in the API fails the build if the two ever diverge, so you can read either reference and use the other.

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "corroborate",
    "arguments": {
      "id": "<id>"
    }
  }
}

Most clients build that frame for you — see Connect a client.

See Errors for what to do with each status, and Retries and backoff for which are worth repeating.

FAQ

What does 200 mean on GET /corroborate?: Distinct hosts carrying the story, grouped and ranked by authority.
What does 401 mean on GET /corroborate?: Missing, unknown or revoked key. A key minted moments ago can answer 401 until it propagates to the serving fleet.
What does 429 mean on GET /corroborate?: Over the per-minute rate (spent in credits), or a hard-capped key without the credits this call costs. `retry-after` is present on the rate-limit case only.