Slabline

by slabline.ai · https://slabline.ai/mcp

Values graded sports cards and Pokémon/TCG slabs by grade from real sales. Free, read-only.

4 tools✓ all read-only✓ no account neededPricing: on their site

See pricing →Visit website

90 /100

PASS · WITH NOTES

12 of 12 checks · 25 Oct 2026

What it can do

4 tools, in the server's own words.

search_cardsread-only

Search Slabline's catalogue of 1.5M+ graded cards (PSA/BGS/SGC/CGC) by player, set, or year.

value_cardread-only

Get one card's current Slabline value: graded market value, raw/loose value, and the across-grades total.

searchread-only

Search Slabline for graded trading cards (sports & TCG) by player, set, or year.

fetchread-only

Fetch one Slabline card by id (the slug returned by search): its current graded market value, raw/loose value, and across-grades total.

Test results

Safe mode: only tools labeled read-only were run. How the test works

!
Ready for the newest MCP version
1 warning
- !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
!
Bad inputs give a clean error
6 warnings
- !search_cards: Accepted missing required input "query" without complaining
- !search_cards: Accepted wrong type for "query" without complaining
- !search: Accepted missing required input "query" without complaining
- !search: Accepted wrong type for "query" without complaining
- !fetch: Accepted missing required input "id" without complaining
- !fetch: Accepted wrong type for "id" without complaining
- and 1 more
note
!
Fast enough
1 warning
- !search_cards: Slowest tool: search_cards (5.3 s): users will notice the wait
- and 3 more
note
✓
ConnectsConnected in 614 ms
pass
✓
Lists its toolsFound 4 tools
pass
✓
Every tool is describedAll 4 tools and their inputs are described
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No hidden instructionsNo hidden instructions found in tool descriptions
pass
✓
Tools work with good inputs
All good
- ✓search_cards: Worked (5.3 s)
- ✓value_card: Answered with an error, probably because of our sample input: No matching card. Use search_cards first to get a slug.
- ✓search: Worked (566 ms)
- ✓fetch: Worked (250 ms)
pass
✓
Tools work together
2 chains working
- ✓search_cards → value_card: value_card found what search_cards returned (slug = "1952-coca-cola-playing-tips-test-willie-mays-psa-6")
- ✓search → fetch: fetch found what search returned (id = "1952-coca-cola-playing-tips-test-willie-mays-psa-6")
pass
✓
No secrets leakedChecked 3 error messages: no secrets or internal details
pass
✓
Resources and prompts work
All good (1 resource)
- ✓Opened 1 of 1 resources
- ✓An address that does not exist gets a clean "not found" error
pass

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://slabline.ai/mcp

Score over time

25 Oct 202690

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use Slabline, signed in with GitHub, one per person. Reviews never change the score.

Is this your server?

Soon you can claim this page: re-test it from here, reply to results, and show a "Tested by QAmcp" badge.

Have a concern, or want it removed? Ask us and we'll take it off the list. How the directory works