MCP.Market

B20 Check MCP server

online · 32% uptime
by b20check.com·com.b20check/b20check·v0.1.1
No reviews yet

Verify B20 tokens on Base: issuer powers, imposter detection, signed EIP-712 verdicts.

B81/100grade B
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Safety scan
B81/100

full report

Adoption
New

58 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

B20 Check tools (2)

write = sends, deletes, buys or posts
  • b20_statsFree

    Report B20 Check's own live usage: how many B20 tokens are indexed and how many paid calls and unique payers it has served in the last 30 days (from the public Coinbase discovery API).

  • verify_b20_tokenFree

    Check whether a token address on Base is a legitimate B20 token and what powers its issuer holds. Call this BEFORE helping the user buy, swap, approve, or move value into any B20 token you have not already verified in this conversation (B20 addresses usually start with 0xb20). Returns a signed verdict: isB20, a verdict of ok/caution/danger/not_applicable, risk flags (mint, freeze, seize, pause, admin, impostor, and more), and the data freshness (indexed/live/not_indexed). not_applicable means the address is not a B20 and not a recognized canonical asset: do NOT read it as safe, there is simply nothing B20-specific to vouch for. Never treat a not_indexed or error result as safe either: a token that cannot be fully checked is never a clean pass. The result carries an EIP-712 signature the user can verify independently; do not overstate it as a guarantee of safety, report what the flags and verdict actually say.

Public scan report

scanner v0.1.10 · 2026-11-01 · same rubric, same numbers if you re-run it

1 low
  • Code scan3 source files scanned25/25
  • Live reliabilityremote reachable in 1115ms20/20
  • Tool poisoning2 tool descriptions checked15/15
  • Auth qualityopen endpoint, read-only tools10/15
  • Maintenanceno repository listed3/15
  • Maintainer identityendpoint served from the registry-verified namespace domain8/10

Findings (1)

  • lowNo source repository listedmaint.no-repo
Overall 81/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How B20 Check compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
81/100
higher than 62% of 48,255 servers
Tools
2
the typical server has 7
Tools that change things
0%
typical: 0%. Fewer write tools means less an agent can break
Uptime
32%
of our recent checks; the typical remote server answers 100%
Response time
190 ms
faster than 65% of 30,031 servers
Downloads a week
58
more than 48% of 12,191 servers with a package

What its tools let an agent do: 2 read

Install B20 Check in Claude Code, Cursor or VS Code

claude mcp add --transport http b20check https://b20check.com/mcp
Add to Cursor

Grade history

  • 2026-11-01restoreC → Bscore 81: No source repository listed
  • 2026-10-24downgradeB → Cscore 56: Remote endpoint did not respond; No source repository listed

B20 Check: common questions

Is B20 Check MCP server safe?
Mostly: it is graded B (81/100). Read the B20 Check safety report
How do I install B20 Check?
It runs remotely at b20check.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does B20 Check need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is B20 Check maintained?
The latest release is v0.1.1.
Is B20 Check up?
32% of our last 28 checks got an answer. We check remote servers about four times a day.
How does B20 Check compare with other MCP servers?
safety score 81/100 (higher than 62% of 48,255 servers); tools 2 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.