datelock

Reproducible historical retrieval

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 agentReplay a receipt

Serving now

Pack
…
Units
…
1"as_of": "1850-12-31"

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"receipt": { "content_hash": … }

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"certified": true

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.

A certified receipt

What a citation looks like.

An answer is only certified when every claim rests on a passage published by the date asked. This one was issued by the API and anyone can replay it.

Claim The atomic bomb was used in 1945

“On August 6th, 1945, at 8:15 A.M., Japanese time, a B-29 heavy bomber flying at high altitude dropped the first atomic bomb on Hiroshima.”

Question
atomic bomb
As of
31 December 1950
Work
The Atomic Bombings of Hiroshima and Nagasaki
Published
29 June 1946
Date basis
document date
Rights
US government, public domain
Verdict
PASS
Pack
…

Source: Project Gutenberg

Replay this receipt

Free access for selected schools, museums and researchers, by invitation. Write to felix-antoine.paradis@karibew.com

Connect

Install in one paste.

No key yet? Request one below ↓

claude mcp add datelock --transport http https://api.datelock.ai/mcp --header "Authorization: Bearer YOUR_DATELOCK_API_KEY"
Run in a terminal; then start a session.

Early access · introductory pricing

Free

For trying datelock

$0/mo

Includes

  • All three tools over MCP
  • 10 requests/min · 200/day
  • 20 asks/day
  • Public receipt registry
  • Receipts kept 30 days
Request a key

Explorer

For personal projects and evaluation

$5/mo

Everything in Free, plus

  • 30 requests/min · 2,000/day
  • 200 asks/day
  • Receipts kept permanently
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Builder

For production agents

$10/mo

Everything in Explorer, plus

  • 60 requests/min · 10,000/day
  • 1,000 asks/day
  • Receipt history for your keys
Request a key

Pro

For teams shipping on datelock

$49/mo

Everything in Builder, plus

  • 120 requests/min · 50,000/day
  • 5,000 asks/day
  • Priority rate limits
  • Direct support
Request a key

Requests count every tool call; asks are era_ask calls, the one tool that runs a model. Introductory limits while in early access; billing runs in test mode until launch. No card is charged today.

Keys are issued by hand during early access. Write to felix-antoine.paradis@karibew.com