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FetchSandbox turns OpenAPI into stateful sandboxes with webhooks and a memory graph—MIT MCP/CLI, 1,000 free runs/mo, $5 Pro. Built for Cursor and Claude Code agents shipping Stripe-class integrations.

MCP spec 2026-07-28 shipped July 28 with a stateless core, header routing, and Tasks for long lookups. Here is how domain check, WHOIS, and portfolio tools should expose tools—not chatbot guesses.

We benchmarked eight bulk checkers against verified limits—5,000 on Namecheap Beast Mode, 100 on Porkbun, 50 per Namecheap API call—and three lookup architectures. Here is how to pick without losing your search list to a registrar.