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CPV codes and OCDS explained: how public tenders are described
CPV codes classify what a public tender buys; OCDS is a standard data format for contracting. A short explanation and how to use both when searching tenders.
How EU VAT number validation works (VIES explained)
How to check an EU VAT number: format check versus a live VIES check, what the answer means, country prefixes and why results can be slow or temporarily unavailable.
What is an LEI (Legal Entity Identifier)? Format, use and lookup
An LEI is a 20-character global identifier for legal entities. What it contains, who issues it, how it differs from a VAT or registration number and how to look one up.
What is KYB (Know Your Business)? Checks, data and limits
KYB means verifying that a company is who it says it is before you do business with it. What the first check looks like, which data it uses and what a lookup cannot tell you.
What is MCP (Model Context Protocol)? A plain explanation
MCP is an open protocol that lets AI applications call tools and read data from servers. What it is, how servers and clients talk, and how to add one in a minute.
What is x402? HTTP 402 payments for APIs and AI agents
x402 turns the HTTP 402 Payment Required status into a payment step a program can complete on its own, with USDC, no account and no API key.