{"uid":"cap_VzOo2mqkhCQlZlHUcHNgh","slug":"property-payapi-market-60143a41","name":"UK Stamp Duty Land Tax (SDLT) Calculator","description":"UK Stamp Duty Land Tax (SDLT) calculator with first-time buyer relief and surcharges.","url":"https://property.payapi.market/stamp-duty","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"price":{"type":"number","minimum":0,"description":"Property purchase price in GBP."},"is_non_resident":{"type":"boolean","description":"Non-UK residents pay an extra 2% surcharge."},"is_first_time_buyer":{"type":"boolean","description":"First-time buyers get relief on properties up to £625,000."},"is_additional_property":{"type":"boolean","description":"Second homes / buy-to-let pay a 5% surcharge (Oct 2024 rates)."}}},"responseSchema":null,"example":{"request":{"price":525000,"is_non_resident":false,"is_first_time_buyer":true,"is_additional_property":false},"response":{"price":525000,"breakdown":[{"tax":0,"band":"£0 – £300,000","rate":"0.0%"},{"tax":10000,"band":"£300,000 – £500,000","rate":"5.0%"},{"tax":1250,"band":"£500,000 – £625,000","rate":"5.0%"}],"total_tax":11250,"buyer_type":"First-time buyer","effective_rate":2.14}},"exampleRequest":{"price":525000,"is_non_resident":false,"is_first_time_buyer":true,"is_additional_property":false},"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_7cxeB8tgguKofDb41lxjd","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates UK Stamp Duty Land Tax owed on a property purchase, applying first-time buyer relief and surcharges for additional properties or non-residents.","exampleAgentPrompt":"How much stamp duty will I owe on a £525,000 house in the UK? I'm a first-time buyer and a UK resident, and it's not an additional property.","exampleUseCases":null,"resultDescription":"Returns the calculated UK Stamp Duty Land Tax amount in GBP for the given property price, incorporating first-time buyer relief (for properties up to £625,000), the 5% additional property surcharge (Oct 2024 rates), and the 2% non-resident surcharge where applicable.","failureModes":["Invalid or negative property price returns validation error","Missing required 'price' field returns 400 bad request","Boolean flag type mismatch returns schema validation error","Server error if upstream computation fails","Payment not processed (402) if x402 payment header is missing or incorrect"],"whenToPreferThis":"Use this endpoint when you need to compute UK Stamp Duty Land Tax for a property transaction and need to account for first-time buyer relief, additional property surcharges (Oct 2024 rates), or the non-resident 2% surcharge. Prefer this over generic tax calculators when dealing specifically with England/Northern Ireland SDLT rules.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:31:17.641Z","isFirstParty":false}