GET /api/v2/entities/search finds curated articles that mention an entity,
sorted by publish date. Requires an active plan on the account mount; wallet
agents use GET /api/v2/x402/entities/search ($0 identity auth).
MCP: search_entities.
At least one of ticker, company, person, organization, subject, or
author is required. Person/company/organization may expand to related
tickers, then match post metadata tags including tagged persons.
Response
query (echo), matchedEntity (resolved entity or null), count,
nextCursor, and items[] — curated post cards with publish dates.
Errors
400 invalid query (no entity input, bad cursor, publishedAfter after
publishedBefore), 500 search failure (retry).