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All supported interfaces use the same account-scoped Bounceless API key. Choose by execution environment, not by a promise of different verification quality.

Interface	Best for	Start here	Important boundary
HTTP API	Applications and services	Quickstart	Four GA routes; `X-Api-Key` is canonical.
CLI	Shell workflows and controlled exports	CLI guide	Writes results to stdout; redirect them to a protected file.
Product MCP	MCP-capable local agents	MCP guide	`@bounceless/mcp` runs locally over stdio and exposes four product tools.
Agent skill	Coding agents that can install skills	Agent onboarding	Instructions only; the key remains in the agent runtime’s secret environment.

The Mintlify documentation MCP is a separate read-only service for searching and reading these pages. It cannot verify an address and must not receive your product API key. For a synchronous one-address check, use Verify single. For a retrievable asynchronous workflow or more than one address, use Verify batch.

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