datelock

Reproducible historical retrieval · MCP-native

Answers sealed
at a date.

Ask a question as of 1850 and nothing published in 1851 can leak into the answer. Every result draws only on rights-clean, dated primary text — and ships with a receipt anyone can replay against the public pack.

Connect your agentVerify a receipt →

Serving now

Pack
…
Units
…
Works
155
Year ceiling
1930
1

Ask at a date

Every query carries an explicit as_of cutoff. A unit is retrievable only when its stored publication evidence is in force on or before that date — later material cannot travel backward.

2

Get sealed evidence

Each response includes a receipt: the pack content_hash, the cutoff, the selected units, and the verification verdict, recorded in a public registry.

3

Let anyone check

The public verifier replays retrieval and claim checks against the live pack. Certification requires the replay to reproduce and the recorded verdict to be a pass — rank is never a truth score.

Connect

One block of config.

{
  "mcpServers": {
    "datelock": {
      "type": "http",
      "url": "https://api.datelock.ai/mcp",
      "headers": { "Authorization": "Bearer YOUR_DATELOCK_API_KEY" }
    }
  }
}

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Explorer

$5/mo

  • Personal projects
  • Standard rate limits
  • Public receipt registry
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Builder

$10/mo

  • Production agents
  • Higher daily quota
  • Receipt history for your keys
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Pro

$49/mo

  • Priority rate limits
  • Highest replay quota
  • Direct support
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Introductory limits while in early access; billing runs in test mode until launch. No card is charged today.