JustTCG (BYOK)

JustTCG (BYOK) — connector documentation

• MCP endpoint: https://byok-justtcg.connectorbay.com/mcp
• REST API: POST https://byok-justtcg.connectorbay.com/v1/tools/{tool_name}, described by the OpenAPI 3.1 spec at https://byok-justtcg.connectorbay.com/openapi.json
• Transport: Streamable HTTP, stateless, MCP specification 2025-06-18 or later
• Authentication: your own JustTCG JustTCG API key, sent in the X-Upstream-Key header of every request (never stored, logged or cached)
• Health: https://byok-justtcg.connectorbay.com/health · Tool schemas: https://byok-justtcg.connectorbay.com/tools.json
• Publisher: Unify Dynamics LLC · connectorbay.com/byok-justtcg · agent@connectorbay.com

What JustTCG (BYOK) is for

JustTCG (BYOK) lets an AI assistant read your own JustTCG data through the JustTCG API with a key you supply (JustTCG API key). Read-only: 7 tools (list_games, list_sets, search_cards, list_cards_in_set, get_card, get_card_by_tcgplayer_id, get_variant). The BYOK key travels with each request, is used for that one call only and is never stored, logged or cached; it is only ever sent to api.justtcg.com. Unofficial connector by Unify Dynamics LLC: not affiliated with, endorsed by or sponsored by JustTCG. JustTCG and its logos are trademarks of their owners and are used only to say which service the connector works with.

Ask your assistant things like:

• "Which trading card games does JustTCG have prices for?"
• "Which Pokemon sets were released most recently?"
• "What is the price of a Charizard card in Pokemon?"
• "Show the cards in the Base Set Pokemon set with prices"
• "Give me all prices for the card pokemon-base-set-charizard-holo-rare"
• "What does TCGplayer product 42346 cost on JustTCG?"

What it does

• list_games: List the trading card games JustTCG covers, with card, set and variant counts and a market value figure per game.
• list_sets: List the card sets of one game, optionally filtered by a name search, with release date and total set value.
• search_cards: Search cards by name text, optionally within one game or set, returning each card with its priced variants (condition, printing, price, 24h change).
• list_cards_in_set: List the cards of one set with prices for each condition and printing, paged.
• get_card: Look up one card by its JustTCG card id (slug or UUID) and return all of its priced variants.
• get_card_by_tcgplayer_id: Look up one card by its TCGplayer product id and return its priced variants.
• get_variant: Look up a single variant (one condition and printing of a card) by its variant id and return the card with that variant priced.

BYOK key

You bring your own JustTCG JustTCG API key (https://justtcg.com/auth/signup). Your assistant sends it in the X-Upstream-Key header with each request. ConnectorBay uses it for that one call only: it is never stored, logged or cached, never shown in an answer, and it is only sent to api.justtcg.com over https, with no redirects followed. Create a key with the fewest permissions the tools need (read-only if the provider offers it), and revoke it at the provider whenever you like.

Data sources

• https://justtcg.com/docs/quickstart (the API this connector calls, with a BYOK key)

Live from the JustTCG API (api.justtcg.com) with a BYOK key; documentation: https://justtcg.com/docs/quickstart. Endpoints checked against that documentation on 2026-10-16.

What it is not

Unofficial connector by Unify Dynamics LLC: not affiliated with, endorsed by or sponsored by JustTCG. JustTCG and its logos are trademarks of their owners and are used only to say which service the connector works with. It is read-only: it never creates, changes, sends or deletes anything in your JustTCG account.

Built for: Worldwide. Languages: English.

JustTCG (BYOK) — Privacy Policy

Effective 24 October 2026. Unify Dynamics LLC ("we", "us"), Menlo Park, California.

What JustTCG (BYOK) is. JustTCG (BYOK) is a connector (an MCP server and REST API) that an AI assistant calls on your behalf to read your own JustTCG data: Read trading card game prices, sets and card variants for Magic, Pokemon, Yu-Gi-Oh and more with your own JustTCG key. You bring your own JustTCG JustTCG API key; the assistant sends it to us with each request.

BYOK key. The key you supply is used to make the one JustTCG call you asked for. Our application does not store it, write it to a log, put it in a cache, or share it. It is sent only to api.justtcg.com, over https, and is removed from any text we return to you or your assistant. We do not follow redirects with your key. If JustTCG rejects it, we say so without repeating it.

What we receive. The arguments of each tool call, the BYOK key (for that call only), the technical headers needed to serve the request (an IP address or a client identifier supplied by the assistant) and standard server logs. What JustTCG receives. The request we make on your behalf, including the key and the arguments, under JustTCG's own terms and privacy policy. JustTCG acts at your direction and is the only recipient of the data of your request besides our hosting provider.

What we return. The answer JustTCG gives for your request, trimmed to the fields the tool documents. We do not keep it: it is returned to your assistant and not stored, cached or used to train anything.

What we do not do. We do not build a profile, sell or share personal information, or keep your JustTCG data. Rate-limit counters (a client identifier and timestamps) are held in memory for at most 24 hours. Hosting access logs (IP addresses, request paths and status codes) are kept for up to 30 days for security and abuse prevention; our application adds no request headers or bodies to them.

Sub-processors. JustTCG (the API you call with a BYOK key, at your direction). Hosting: Vercel (United States regions).

Your rights. Because we store no personal data beyond short-lived logs, requests to access, correct or delete data are usually satisfied automatically; you can still contact agent@connectorbay.com and we will respond within 30 days. Revoke your key at JustTCG at any time to end all access.

Children. JustTCG (BYOK) is a general-audience service operated by the adult using the assistant, under JustTCG's own age rules.

Changes. We will post changes here with a new effective date.

JustTCG (BYOK) — Terms of Service

Effective 24 October 2026. These terms govern use of the JustTCG (BYOK) connector ("the Service") operated by Unify Dynamics LLC ("we", "us").

1. The Service. JustTCG (BYOK) provides: Read trading card game prices, sets and card variants for Magic, Pokemon, Yu-Gi-Oh and more with your own JustTCG key. It is accessed through an AI assistant or directly over MCP or HTTP, and is read-only.
2. Your own key, your own account. You must use your own JustTCG credentials and only access data you are allowed to access. JustTCG's terms apply to your use of JustTCG; you are responsible for complying with them, including any rate limits and permitted uses. Do not share a key you do not own.
3. Independent. Unofficial connector by Unify Dynamics LLC: not affiliated with, endorsed by or sponsored by JustTCG. JustTCG and its logos are trademarks of their owners and are used only to say which service the connector works with.
4. No advice, no guarantees. Output is the data JustTCG returns, lightly trimmed; it may be incomplete, delayed or changed by JustTCG. Check important facts at the source.
5. Read-only. The Service does not create, change, send or delete anything in your JustTCG account.
6. Acceptable use. Automated use within the published rate limits is welcome. Do not use the Service to access data you are not entitled to, to circumvent JustTCG's controls, or to attack any system.
7. Availability. The Service is provided "as is" without warranty. We may change, limit or discontinue it at any time; JustTCG may change or end its API at any time.
8. Data. Our Privacy Policy describes what we process. In short: the BYOK key is used for the one call and not stored or logged.
9. Pro keys. Optional ConnectorBay Pro API keys are issued at our discretion and are separate from your JustTCG key.
10. Liability. To the fullest extent permitted by law, Unify Dynamics LLC is not liable for any loss arising from use of or reliance on the Service, including any action JustTCG takes on your account. Our total liability is limited to US $100.
11. Governing law. California law; venue in San Mateo County, California.
12. Contact. Unify Dynamics LLC · agent@connectorbay.com · https://connectorbay.com/byok-justtcg

JustTCG (BYOK) support

Email agent@connectorbay.com. We answer within two business days.

• MCP endpoint: https://byok-justtcg.connectorbay.com/mcp
• REST API: https://byok-justtcg.connectorbay.com/openapi.json
• Live status: https://byok-justtcg.connectorbay.com/health

When you report a problem, include the question you asked your agent, roughly when, and which agent you used (for example Claude, ChatGPT or Gemini). Never send us passwords, account numbers or ID numbers. JustTCG (BYOK) never asks for them.