Most "cheapest search API" posts compare monthly plans, but agents are billed per call. This post compares the published per-call prices of web search and extraction APIs that developers use with AI agents. How we did this. We checked every price on October 2, 2026 on the vendor's own public pricing page, linked in each row. We only list a per-call price where the vendor states one. Plan-only and token-based pricing gets its own section, with the arithmetic shown. We don't compare resul...