**Your MCP server accepts an API key. Your client expects OAuth.** MCP OAuth Key Bridge gives developers a self-hosted Cloudflare Worker source kit to bridge that gap **without rewriting the existing HTTPS MCP server**. Keep your upstream API key on the server side; let the OAuth gateway handle client authorization. **What your $19 purchase includes** • The complete 16-file beta Worker/source package—not a prompt or hosted subscription. • OAuth authorization and PKCE consent flow, token state in Cloudflare KV, basic rate limiting, and Bearer / X-API-Key upstream support. • Pinned dependencies, buyer quickstart and configuration guide, reproducible integrity verification, rollback guidance, and security test suite. • A single-file Python delivery: run `python3 bridge-delivery.py --verify` and `python3 bridge-delivery.py --extract ./my-new-bridge` to obtain the real project files. **Evidence you can inspect:** 41/41 isolated automated checks passed (SDK / Miniflare / client regression); 16/16 packaged files passed extraction and SHA256 integrity checks. These prove the offline package and tested OAuth behaviors, **not** an independent live ChatGPT connection. **Who it is for:** Developers with their own HTTPS MCP backend, authorized upstream API key, and Cloudflare Workers account. You'll need Node.js 22+, Python 3.9+, Cloudflare Worker/KV/Rate Limiting bindings and secrets. This is a setup-and-deploy source kit, **not** a one-click hosted service or autonomous AI agent. **Important beta compatibility note:** Adding this MCP to a real ChatGPT account, an independent public buyer deployment, and `tools/call` from that official UI are **not yet certified**. Cloudflare workers.dev may reject automated OAuth clients (Error 1010); a buyer-controlled custom domain may be required. Please **do not buy expecting guaranteed ChatGPT / Claude / Cursor compatibility today**. Upstream APIs and Cloudflare infrastructure may incur their own usage charges. No managed hosting, SLA or guaranteed updates are included. **License:** One active production install plus one development/staging install for your own internal use. Modification for your internal workflow is allowed; resale/redistribution of EDGAR-owned source is not. Third-party licenses remain in effect, and statutory consumer rights and applicable marketplace refund rules are preserved. **Pricing:** $19 one time. Early-access developer beta; non-tokenized.