Cresva, inside ChatGPT.
A Custom GPT you open from a link. Nothing to install, no config file, no key to paste.
Which of my products are missing a price in their markup?
Here is what your catalogue publishes for agents:
Illustrative exchange, not a transcript.
It calls Cresva's API on your behalf
A Custom GPT reaches its data through actions, which are REST calls it makes while you talk to it. Ours are pointed at Cresva's analytics API.
What the GPT is configured to call. We have confirmed the listing opens; we have not published a verified end to end run of every action returning live data.
What we have checked, and what we have not
We have confirmed the GPT is published and that its listing opens. We have not published a verified end-to-end run of every action returning live data, so this page does not claim one. If you try it and something does not answer, that is worth telling us rather than working around.
The connector with a published, independently verifiable tool list today is the Claude one, where the server is an npm package anyone can run and inspect.
The tools behind both doors
These are the storefront tools Cresva publishes, rendered from the same list the package is tested against. The Claude connector exposes them directly over MCP.
discover_storefront
Find a brand's agent-readable storefront and what it publishes.
search_products
Search a storefront's catalogue by query.
list_products
List a storefront's products with their offer fields.
get_product
Read one product, including price, currency and availability.
negotiate_price
Ask a storefront what it will do on price, where it supports it.
get_trust_score
Read the storefront's published trust signals.
compare_products
Compare products across a storefront on the fields agents read.
scan_store
Scan any public store URL and report whether agents can find it, understand it and buy from it. No brand id, no key.
What a Custom GPT is good at
Nothing to install
No config file, no package, no restart. You open a link and start typing, which is the whole setup.
Shareable by link
Sending the URL is how you give it to somebody. Everyone on a paid plan opens the same GPT under their own account.
Inside an account you already have
It runs in ChatGPT, under OpenAI's controls and your existing plan, rather than as another tool to administer.
ChatGPT and Claude reach the same intelligence layer
This page is the Custom GPT door. The other is an MCP server you run yourself. They are two ways into the same thing rather than two products.
ChatGPT
You are here · Custom GPT
Questions
What is a Custom GPT?
A version of ChatGPT configured for one job, with its own instructions and its own set of actions it can call. You open it from a link and start talking; there is nothing to install and no config file to edit.
Do I need ChatGPT Plus?
Yes. Custom GPTs are a paid-tier feature, so opening this one needs an active ChatGPT Plus, Team or Enterprise plan. That is OpenAI's requirement rather than ours, and there is nothing we can do to lift it.
Can I share it with my team?
The link is the whole distribution mechanism. Anyone on a paid plan who opens it gets the same GPT, so sharing is a matter of pasting the URL. Each person talks to it under their own ChatGPT account.
Is this the same as the Claude connector?
Same intelligence layer, different door. Claude uses MCP, an open standard where a small server runs on your own machine. ChatGPT uses a Custom GPT that calls our API. Pick whichever assistant you already use.
Listing checked 2026-08-11
Open the link. Start typing.
There is no config file and no package. The GPT is where the setup would have been.