Crypto Tax MCP

Cost basis tracking, capital gains calculation, and 1099-DA reconciliation for Claude, built on top of the Crypto Portfolio MCP data layer.

→ biggling/crypto-tax-mcp · listed on glama

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// key findings

🚨

Secret credentials may flow to a network call

2 flows detected: POLAR_API_TOKEN. We can’t prove the destination matches the brand the credential belongs to.

⚠️

Known vulnerabilities in dependencies: 3 high

Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.

⚠️

Tests do not pass

Either the test suite is broken or the code regressed. Either way the published behaviour can’t be verified by the publisher’s own tests.

🔐

You'll be asked for 4 credentials: COINGECKO_API_KEY, MCPIZE_UPSTREAM_TOKEN, POLAR_API_TOKEN, POLAR_WEBHOOK_SECRET

These are read from process.env at runtime. Make sure you trust where they’ll be sent.

// required environment variables

This server reads these from process.env. You'll be asked to provide them before it can run.

🔐 secretCOINGECKO_API_KEY— Edit .env — set

configDB_PATH— SQLite file ./data/tax.db

🔐 secretMCPIZE_UPSTREAM_TOKEN— MCPize gateway upstream token optional

🔐 secretPOLAR_API_TOKEN— Polar.sh API token optional

configPOLAR_PRODUCT_PRO— Polar product ID for Pro tier optional

configPOLAR_PRODUCT_TAX— Polar product ID for Tax tier optional

🔐 secretPOLAR_WEBHOOK_SECRET— Polar.sh webhook signature secret optional

configPORT— HTTP listen port 3001

// full audit trail

The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.

// improvement guidance — verified publishers only

We have 7 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.

// embed badge in your README

[![M8ven Score](https://m8ven.ai/badge/mcp/biggling-crypto-tax-mcp-14wjpw)](https://m8ven.ai/mcp/biggling-crypto-tax-mcp-14wjpw)

commit: e533cf71aeddb13337d1936b448d90c7e3cb021f

code hash: 88697c0386aec24fd3279df5acd5a96d2e85bee10acb24e41563367231613f70

verified: 6/18/2026, 11:06:47 AM

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