APIStack gives AI agents such as Claude, ChatGPT and Cursor deterministic tools over the Model Context Protocol for facts they should not answer from memory. There are 16 focused tools covering the current time in a time zone, holidays and working days, exchange rates, VAT and IBAN checks, company lookups, link safety, sanctions screening and more. You add the URL and it works right away with no sign-up, with 50 free calls a day and an optional free API key beyond that.
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Ask for the time in a time zone instead of letting the model infer it.
Check VAT numbers and IBANs through a tool rather than a guess.
Run link safety and sanctions checks inside the agent's tool loop.
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