Past.dev

AI agents forget. Past.dev is a memory service for products whose agents need lasting context about customers or accounts, instead of going back through every document. Its makers introduced it in a post of 30 September 2026 and opened self-serve sign-up the same day; a Hacker News presentation followed on 1 October.

Dated text in, current facts out

Teams send Past.dev text with its original timestamp: emails, call notes, support tickets and chat messages. Backfilled data keeps its original date. The service derives facts from that text. When an agent asks a question, it answers with the facts that currently hold, each linked to the dated source it was drawn from, along with what changed and when.

Limited to what the asking user may see

Each query carries an identity, and Past.dev limits the answer to facts that the person the agent is working for is permitted to view. The product page lists audience filtering and identity-aware recall among its main features, alongside current-state tracking, dated evidence and per-call usage reporting.

Four endpoints and MCP

The API is organized around four endpoints, including one to ingest data and one to recall it, and it can also be reached over MCP. Getting started takes three steps: create a project key in the console, post text to the ingest endpoint, then post a question and an identity to the recall endpoint to receive ranked evidence with dated sources.

Pricing and benchmark claim

Customers can pay as they go with credit packs, or choose a Flex plan with unlimited recall calls. Past.dev says early-stage start-ups can have six months of Flex free. The company claims first place on BEAM, which it calls the largest public memory benchmark; that is its own claim, and no independent report was found. The site names no operating company or location.