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Crypto Tax Calculator
x402
Crypto Tax Calculator is a paid API for AI agents from tax-api-production-eb93.up.railway.app, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-23).
Calculates US capital gains tax liability for cryptocurrency transactions using 2026 tax brackets, covering LTCG, STCG, and NIIT.
Price / call$0.1
Success—
StatusUnknown
How this service works
US capital gains tax calculation. 2026 brackets. LTCG, STCG, NIIT. Pay per calculation on Base.
Output
Returns a structured tax report breaking down the tax owed by category: short-term capital gains (STCG) taxed as ordinary income, long-term capital gains (LTCG) at preferential 2026 bracket rates, and net investment income tax (NIIT) where applicable, along with the total tax liability.
Example use cases
Individual crypto trader tax estimate
“I sold some crypto this year — $45,000 in long-term Bitcoin gains and $12,000 in short-term Ethereum gains. My other income is $95,000 and I'm filing as single. What will my total 2026 tax bill look like, including any NIIT?”
Married couple portfolio rebalancing tax check
“My spouse and I are thinking of rebalancing our crypto portfolio. We'd realize about $80,000 in long-term gains, we file married filing jointly, and our taxable income is around $250,000. Can you calculate what we'd owe in capital gains tax and NIIT under the 2026 brackets?”
Year-end tax planning for crypto losses and gains
“I have $60,000 in long-term crypto gains and $15,000 in short-term gains this year. My taxable income including other income is $175,000 and I file as head of household. Run the 2026 tax calculation so I can decide whether to harvest any more losses before year-end.”
Technical details
Endpoint
POSThttps://tax-api-production-eb93.up.railway.app/tax-report?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, pay-per-use US crypto capital gains tax calculation with 2026 bracket accuracy, covering LTCG, STCG, and NIIT in a single call — ideal for agents handling tax planning, portfolio rebalancing, or year-end reporting without requiring a full tax software subscription.
Side effects
- Missing required 'gains' array returns a 400 validation error
- Invalid filing status string may cause incorrect bracket lookup or error
- Extremely large gain arrays may cause timeout
- Payment not completed or insufficient USDC causes 402 Payment Required response
- Malformed gain entries (missing amount or holding period) may produce incorrect calculations
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| gainsrequired | array | |
| otherIncome | number | |
| filingStatus | string | |
| taxableIncome | number |
Tags
x402
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