0n3
MCP servers · CardFlow · connector · GPT action

Connect ChatGPT to CardFlow

One line gives ChatGPT your CardFlow account as tools: 8 endpoints, scan, orders, inventory, called with your own connection. No key in the prompt, a receipt for every call, revoke ChatGPT's access alone any time.

Get the line for ChatGPTConnect CardFlow first

Three steps

  1. Create a free 0n3 account and connect CardFlow. Paste a key or sign in; it lands in your vault, encrypted.
  2. Install 0n3 into ChatGPT. A custom connector in Developer mode, or an Action on a custom GPT from the OpenAPI spec.
  3. Ask ChatGPT: whoami. Then: "Scan in CardFlow".
Custom connector (needs Developer mode)
  1. Settings → Connectors (or Apps) → Advanced → Developer mode on
  2. Create → name 0n3 · MCP server URL https://0n3.app/mcp · Authentication: OAuth
  3. Finish the sign-in with your 0n account
  4. Enable the connector in a chat and ask: "whoami"

ChatGPT connectors cannot send a static header, so 0n3 signs you in through its OAuth door (dynamic client registration is on).

The line above carries a placeholder; 0n3.app/install mints a real key named for ChatGPT and fills it in.

What ChatGPT can then do in CardFlow

Scan · Identify a card from a photo URL (front, optional back) — the same engine MyKidCard uses1
ScanPOST /scan
Orders · eBay orders from the mirror, the packing list (one envelope per buyer, overdue first), and shipping an envelope with one tracking number1
OrdersGET /orders
Inventory · Every card with status, tier, comps, eBay ids and photo URLs0
Every card with status, tier, comps, eBay ids and photo URLs
Messages · Kids' custom thank-you notes waiting for a grown-up; send or drop one0
Kids' custom thank-you notes waiting for a grown-up; send or drop one
More · Everything else this app exposes.6
CardsGET /cards
CardGET /cards/{sku}
PackingGET /packing
ShipPOST /ship
Thank yousGET /thank-yous
Decide thank youPOST /thank-yous/{id}

CardFlow in other AI clients

Claude Code + CardFlowMCP server + skillClaude (desktop & claude.ai) + CardFlowconnectorCodex CLI + CardFlowMCP serverGemini CLI + CardFlowMCP serverCursor + CardFlowMCP serverVS Code (Copilot) + CardFlowMCP serverWindsurf + CardFlowMCP server

ChatGPT with other apps

Hostinger363 endpointsTelegram132 endpointsPipedrive95 endpointsResend67 endpointsSquare57 endpointsLinkedIn50 endpointsSlack45 endpointsFigma32 endpointsCloudConvert32 endpointseBay25 endpointsQuickBooks21 endpointsCloudflare21 endpoints