crypto-tax-cost-basis-mcp
Crypto tax calculator MCP: exact cost basis & capital gains via FIFO, LIFO, HIFO & specific-ID short/long-term splits, Form 8949, audit trail. 100% offline, no API keys.
How to pay
Subscribe
$9/month
Predictable monthly cost with included usage. Best for steady, high-volume traffic.
- Unlimited tools within plan limits
- One API key, billed once a month
- Cancel any time
Deterministic crypto tax calculator for AI agents. Turn a raw list of buys and sells into exact, audit-defensible capital gains and cost basis — computed with precise decimal math (never floats), fully offline, with no API keys and nothing leaving your machine.
What it does
- Cost basis & realized gains using FIFO, LIFO, HIFO, or specific-identification
- Short-term vs long-term classification (IRS holding-period rules) with per-year rollups
- Fee-adjusted basis and a carried-forward open-lot ledger for multi-year tracking
- Compare methods side by side (FIFO vs LIFO vs HIFO) to find the lowest-liability approach — built-in tax optimization
- Plain-English audit trace showing exactly which lots were matched for every disposal
- Form 8949-ready output
Tools
validate_transactions · calculate_cost_basis · capital_gains_report · compare_methods · remaining_open_lots · audit_trace
Why it's different
LLMs silently drop and mis-match tax lots — dangerous at filing time. This engine is deterministic and reproducible: same input, same numbers, every time, with a line-by-line trail you can defend. Unlike black-box tax apps, it's privacy-first — you supply the transactions, it returns the math. No accounts, no uploads, no data retention.
Pricing
Free tier to try it · Pro $9/mo · CPA $29/mo for higher volume.
⚠️ For informational purposes only. Not tax, legal, or accounting advice. The U.S. wash-sale rule (§1091) does not currently apply to crypto and is intentionally excluded. Verify figures and consult a qualified tax professional before filing.