Use to find the right Wikipedia article before reading it: full-text search over one Wikipedia language edition, returning up to 20 results with title, plain-text snippet, page URL, word count and last edit time, ranked by relevance. Results are titles and snippets only; use /v1/summary for content. Paid tool: x402 USDC on Base, $0.001 per successful call; call without payment to receive the PaymentRequired object.