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Show HN: A free MCP server for facts LLMs get wrong (time zones, holidays, FX)
Brief published October 20, 2026 ยท Original source published October 19, 2026
Original reporting by arindamnexovia at apistack.online.
Automated brief. Verify important details at the original source.
What happened
A free MCP server launched at Apistack.online offers 16 tools covering categories where LLMs commonly produce errors: current time and date math, holidays and working-day calculations, exchange rates, VAT and IBAN validation, company lookups, and DNS queries. No sign-up is required, and the service provides 50 free calls per day. It exposes these capabilities via the Model Context Protocol, allowing AI agents to call live data sources rather than rely on memorized or stale training data.
Why it matters
Builders integrating LLMs into workflows involving finance, scheduling, or compliance face real reliability risks when models hallucinate time zones, exchange rates, or tax identifiers. Routing those queries to purpose-built API tools through a standardized protocol reduces that failure surface without requiring custom integrations for each data type.
What to watch
The 50-call daily cap will constrain production use cases, so watch for whether paid tiers or higher limits are announced. It is also worth tracking which additional tool categories get added beyond the current 16.