Dated, sourced facts about AI and tech companies: what was true on a day, and what changed since.
Connect Remote server
claude mcp add --transport http asof https://asof.is/mcp --header "Authorization: Bearer <YOUR_API_KEY>"{
"mcpServers": {
"asof": {
"url": "https://asof.is/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}{
"servers": {
"asof": {
"type": "http",
"url": "https://asof.is/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}Settings > Connectors > Add custom connector
URL: https://asof.is/mcpReplace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools 10 found in our last check
entity_stateAlso returns ended: the terms that closed on or before the day (a CEO who left, a seat given up), newest first, so a former role is answered too. State of an entity as of a date: the claims that held on that day, with sources and confidence. Omit as_of for today. For a company,…
changes_sinceLeads with headline and highlights: the changes that took effect since the date, ranked (leadership, then ownership and deals, then releases; figures and repositories last) and said as a sentence, drawn from the entity's whole record when one is named. Read them first; the rows…
timelineLeads with headline and highlights, the main changes among the rows asked for, ranked and said as a sentence; the rows follow. Dated events and state changes for an entity in chronological order, superseded claims included, future-dated (announced) items included. Newest first w…
coverageWhat the record covers for an entity, so an empty answer can be told apart: not covered (no source reads it), unknown (covered, nothing checked yet) or covered with nothing on that date. sources: the official feeds that record posts on it or speak for it, its SEC filing (CIK, ti…
claimOne claim by id with its sources and supersession links, its three dates (valid_from, published, recorded) and the check behind it: the method and, where kept, the passage on the source page that states the value.
searchFind entities by name, slug, ticker or former name ('MSFT', 'Facebook', 'Google AI Mode'; accents, spacing and one typo forgiven), and claims by value, predicate, entity and date ('who is the CEO of Microsoft', 'Google core update March 2026'), best match first. Returns slugs to…
trendsWhat the record's dated events say about how AI and tech companies ship and where their money goes, by quarter since 2023. Counted from checked claims only, by trend tags a model gives each claim from a fixed list, including whether the claim is about AI or the rest of tech (jud…
entity_diffWhat changed on an entity's record between two days: its state on from against its state on to (today when omitted), compared by claim. added: facts held on to and not on from. ended: held on from, not on to, and not replaced. replaced: the same predicate with another value, the…
modelsThe latest model of an AI model family (gpt, claude, gemini, llama, grok, mistral, deepseek, qwen and the others the record follows): the newest release with its date and source, the current model of each line with the flagship marked, and the family's answer sentence. Use it fo…
fetchFetch a page's markdown twin by its path: /record/{slug}.md (add ?as_of=YYYY-MM-DD for a past day), /record/{slug}/{predicate}.md (a fact page: one fact's every dated value, e.g. /record/anthropic/revenue.md; entity_state's fact_pages lists them), /record/{slug}/diff.md?from=YYY…
Headers
| Name | Description |
|---|---|
AuthorizationOptional, secret | Optional. "Bearer asof_..." counts requests against an AsOf API key's own budget instead of the per-address limit. The server answers without it. |
Details
| Endpoint | https://asof.is/mcp (Streamable HTTP) |
| First published | 13 Nov 2026 |
| Last updated | 13 Nov 2026 |
| Registry name | is.asof/asof |
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