API Development MCP Servers for Cursor

Reliable one-off and recurring HTTPS callbacks for apps and agents.

Register an event callback address.

Find and call verified APIs from any AI assistant, with free trial calls and previewed writes.

Validate emails, phones, IBAN, VAT; look up IPs and companies; rates, holidays, time via Abstract.

Webhook, email and DNS inboxes for AI agents to capture callbacks and test integrations.

Evidence-cited machine-readable contracts for how agent platform APIs really behave