mcp-server-bananacrystal
Official MCP server for Agent payment infrastructure for AI agents. MCP server for autonomous stablecoin transfers, currency swaps & agent wallets. Works with Claude, LangChain, CrewAI. Settled on Hedera.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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BananaCrystal
Source: PulseMCP · also listed on github_code, Glama
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Install from
The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
When Vitest UI server is listening, arbitrary file can be read and executed
Vitest allows Remote Code Execution when accessing a malicious website while Vitest API server is listening
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
express vulnerable to XSS via response.redirect()
Express.js Open Redirect in malformed URLs
BANANACRYSTAL_API_KEY"": "bc_test_your_sandbox_key_here"BANANACRYSTAL_API_URLNo https://agentic.bananacrystal.com/mcp Override API endpoint (for MCP tools). Rate service uses /api/v1/mcp/rate/ endpoints on same domain.Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
40/40 tools missing one or more hints — ping (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_server_info (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); echo (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +37 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tests exist
No test files found
Add tests that exercise each declared tool.
Secrets not logged
1 secret value sent to console.log
Redact or omit secret values from log output.
Production dependencies are patched
0 critical, 1 high severity in production deps — @modelcontextprotocol/sdk@1.0.4 (high), express@4.18.2 (low)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
Dev dependencies
2 critical/high in dev-only deps (does not ship to users)
Upgrade dev dependencies when convenient.
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