{"uid":"cap_bjT4e1pc2IHO2LT2XXQka","slug":"mart402-japan-crypto-asset-tax-calculator-nta-method-33d7fafc","name":"Mart402 Japan Crypto-Asset Tax Calculator (NTA Method)","description":"Japan crypto-asset tax: realized income under the NTA total-average or moving-average method (sell/spend/exchange as disposals, fees deductible, opening balances). Verified against the official NTA FAQ examples to the yen. Max 300 transactions per call. $0.05/call.","url":"https://mart402.com/v1/jp-crypto-tax?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"transactions":{"type":"array"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_umrbt1R1MY2ZN-pwB55Jb","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes realized crypto-asset income for Japanese tax purposes using the NTA total-average or moving-average method, supporting sales, spending, exchanges as disposals, and deductible fees with opening balances, verified against official NTA FAQ examples.","exampleAgentPrompt":"Calculate my Japanese crypto-asset taxable income for fiscal year 2024 using the total-average method — here are my transactions including BTC purchases, sales, and exchange fees, plus my opening BTC balance of 0.5 BTC acquired at ¥2,000,000.","exampleUseCases":[{"title":"Annual crypto tax filing for Japan","prompt":"I need to file my Japanese income tax and report my crypto gains. I have about 80 transactions this year — BTC and ETH buys, sells, and one exchange — plus an opening balance. Can you compute my realized income using the NTA total-average method, deducting all my trading fees?"},{"title":"Moving-average cost basis for DeFi activity","prompt":"I've been using DeFi protocols and want to know my taxable crypto income under Japanese NTA rules using the moving-average method. My transaction list includes swaps and spending as well as regular sales — can you calculate my realized gains after fee deductions?"},{"title":"Verify NTA example calculations","prompt":"I want to double-check my crypto tax numbers against the NTA FAQ example scenarios. Can you run my transactions through the total-average method and confirm the realized income in yen matches what the official NTA guidance shows?"}],"resultDescription":"Returns realized income in yen computed under the selected NTA method (total-average or moving-average), including per-disposal cost basis, gross proceeds, deductible fees, and net taxable gain, fully consistent with official NTA FAQ example outputs.","failureModes":["Exceeds 300-transaction limit per call — must batch transactions across multiple calls","Missing or malformed opening balances cause incorrect cost basis calculations","Unsupported disposal event types not recognized as sell/spend/exchange","Invalid or missing transaction timestamps preventing chronological ordering for moving-average method","Ambiguous currency amounts (non-yen) causing calculation errors"],"whenToPreferThis":"Choose this endpoint when you need NTA-compliant Japanese crypto-asset tax computation specifically verified against official NTA FAQ examples, supporting both total-average and moving-average methods with fee deductions and opening balances, rather than generic crypto tax tools that may not match Japanese regulatory requirements or NTA rounding rules.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T00:45:10.095Z","isFirstParty":false,"canonicalSlug":"mart402-japan-crypto-asset-tax-calculator-nta-method-33d7fafc"}