I will create a custom GPT with actions that call your live APIs and tools

I will create a custom GPT that connects to your live APIs and tools through actions, so it can fetch real data, take real steps, and answer with facts instead of guesses.

What you get

A working custom GPT built inside your own ChatGPT workspace (you keep full ownership), wired to your real systems through actions. Concretely, you receive:

• A configured custom GPT with a tuned name, description, conversation starters, and profile setup ready to share with your team or publish to your workspace.
• A carefully written system prompt (instructions) that defines the GPT's role, tone, guardrails, refusal rules, and exactly when and how to call each action.
• One or more actions defined from a valid OpenAPI 3.1 schema, each mapped to a real endpoint on your API or a third-party tool you already use.
• Authentication wired correctly: API key, Bearer token, or OAuth, configured so calls reach your backend securely without exposing secrets in the prompt.
• Privacy-conscious schema design that sends only the parameters each endpoint needs and trims response payloads so the model stays fast and on-budget.
• Clear request/response examples for every action, plus tested prompts that reliably trigger the right call.
• A short written handoff covering how each action is wired, what each endpoint does, how to edit or extend it, and how to rotate keys.
• A walkthrough (text guide or recorded video, depending on tier) so a non-technical teammate can operate and maintain the GPT.

This is a hands-on build delivered into your environment. It is not a downloadable template, a generic prompt pack, or a "wrapper" app. Everything is built against your actual endpoints and tested end to end before handoff.

Plans

Feature	Basic	Standard	Premium
Custom GPT configured in your workspace	Yes	Yes	Yes
Tuned instructions and conversation starters	Yes	Yes	Yes
Live API actions wired and tested	1 action	Up to 3 actions	Up to 6 actions
OpenAPI schema authored / cleaned	Yes	Yes	Yes
Authentication (API key / Bearer / OAuth)	API key or Bearer	Bearer or OAuth	OAuth + multi-service
Response shaping and parameter trimming	Basic	Yes	Advanced
Error-handling and fallback instructions	Basic	Yes	Advanced
Multi-step / chained action flows	No	Limited	Yes
Written handoff documentation	Short	Detailed	Detailed
Walkthrough	Text notes	Text guide	Recorded video
Revision rounds	1	2	3

If your needs sit between tiers or involve unusual auth, message me first and I will tell you honestly which tier fits.

How it works

1. Discovery. You tell me what the GPT should do and which APIs or tools it must reach. I review your API docs (or your existing OpenAPI/Swagger file) and confirm the endpoints, auth method, and expected inputs and outputs.
2. Scope and plan. I map each desired capability to a specific endpoint and list the actions to build. We agree on what is in scope before any building starts, so there are no surprises.
3. Schema authoring. I write or clean up a valid OpenAPI 3.1 schema describing each action, including paths, parameters, request bodies, and trimmed response shapes that keep the model focused.
4. Auth wiring. I configure authentication the right way for your setup, using a test key or sandbox credentials you provide, never your production secrets unless you insist.
5. Instruction tuning. I write the GPT's instructions so it knows its role, when to call each action, how to format answers, and how to behave when an endpoint returns an error or empty result.
6. Testing. I run real prompts against your live or staging endpoints, confirm the calls fire correctly, and adjust the schema and instructions until behavior is reliable.
7. Handoff. I deliver the GPT in your workspace with documentation and a walkthrough, then complete your included revision rounds.

Why choose this

Most "custom GPT" work stops at a clever prompt. The hard part, and the part that makes a GPT genuinely useful, is connecting it to live data and real actions so it stops hallucinating and starts doing. That is exactly what I focus on. I treat your API as the source of truth, design schemas the model can actually use, and handle the authentication details that trip most people up. You get something that works against your real systems, documented well enough that you can maintain and extend it yourself. I am direct about scope: if an endpoint cannot support what you want, I will say so rather than ship something fragile.

Who it's for / use cases

This is for founders, product teams, agencies, and operators who already have an API or use tools with APIs and want a conversational front end that can act, not just chat. Common use cases:

• An internal assistant that looks up orders, customers, inventory, or tickets from your backend in real time.
• A support GPT that creates, updates, or checks the status of tickets in your help-desk tool.
• A sales or research GPT that pulls live records from your CRM or a data provider.
• A developer or ops helper that triggers builds, checks job status, or queries logs through your internal endpoints.
• A booking or scheduling assistant that reads availability and creates entries via your calendar or reservation API.
• A content or catalog GPT that fetches up-to-date product, pricing, or document data instead of relying on stale training knowledge.

If you can describe the action as an API call, it can very likely become a GPT action.

FAQ

Q: Do I keep ownership of the GPT? Yes. It is built inside your own ChatGPT account or workspace, so you own it, control access, and can edit it whenever you like. I hand off full documentation so nothing is locked to me.

Q: What do you need from me to start? Your API documentation or an existing OpenAPI/Swagger file, a description of what the GPT should do, and test or sandbox credentials for the endpoints. If you do not have an OpenAPI schema, I can author one from your docs.

Q: Is my API key safe? Yes. Credentials are stored in the GPT's action configuration, not pasted into the visible prompt. I recommend test or scoped keys during the build and explain how to rotate keys in the handoff.

Q: What if I do not have a public API? Actions need an endpoint the GPT can reach over HTTPS. If your service is internal-only, you will need an externally reachable endpoint or gateway. I can advise on this, but standing up new infrastructure is outside the standard scope.

Q: How many APIs or tools can you connect? It depends on the tier: one action on Basic, up to three on Standard, and up to six on Premium. Each action maps to one endpoint. If you need more or have complex chained flows, message me and we will scope it.

Q: Will the GPT work for everyone on my team? Yes, once shared within your workspace or published per your plan's sharing settings. Each user's calls run against the auth you configured, and I will explain the sharing options during handoff.

Q: Can you also build the API itself? This service focuses on the GPT and its actions against APIs that already exist. If your endpoints need changes to support an action, I will tell you exactly what is required, and we can discuss building those separately.

Q: What counts as a revision? A revision is an adjustment to the agreed scope: tweaking instructions, refining a schema, or correcting behavior on a defined action. Adding brand-new actions or new endpoints beyond your tier is new scope, which I am happy to quote.