{"id":"614f66a6-9545-44b7-8649-f80141ca5421","shortId":"Xctj6b","kind":"x402","title":"Mortgage data API endpoint on Base, pay-per-call via x402 with USDC.","tagline":"Mortgage data API endpoint on Base, pay-per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/33`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated via the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/mortgages/33` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). This is consistent with the site's uniform $0.02/request pricing across all endpoints. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or example payloads for any endpoint, including this mortgage one. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no substantive content. The mortgage endpoint path (`/mortgages/33`) suggests it may return data for a specific mortgage record (ID 33), but the exact data model, accepted parameters, and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","json-api","post-method"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC mortgage endpoint","real estate finance API"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","No request or response schema provided for /api/v1/mortgages/33","The endpoint path suggests a single mortgage record (ID 33); unclear if other IDs are available or what data is returned","The 'Premium API Access' title is generic and does not describe the actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/33","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/mortgages/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no request/response schema, no examples, and no explanation of what the mortgage endpoint actually returns. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/mortgages/33':43,88 '/docs':183 '/mortgages/33':204 '/pricing':185 '/readme':187 '/request':131 '0.02':115,130 '000':104 '0x8335':109 '20':103 '2913':110 '33':216 '6':120 'USDC mortgage endpoint' 'accept':89,222 'access':34 'across':133 'advertis':98 'ai/ml':65 'analyt':64 'api':3,17,60,145 'avail':161 'base':6,20,81,105,112 'broader':49 'call':10,24 'challeng':97 'connect':193 'consist':124 'content':199 'cost':101 'crypto':68 'data':2,16,39,63,209,220 'decim':121 'descript':171 'document':153 'dozen':54 'endpoint':4,18,30,61,87,135,162,177,202 'equal':114 'exact':142,219 'exampl':173 'extrem':155 'financ':67 'gate':73 'home loan API' 'id':215 'includ':178 'infer':66 'json':94 'json-api' 'key':146 'land':158 'limit':150 'list':160 'lowpaymentfee' 'lowpaymentfee.com':32,51 'made':138 'maximum':100 'may':207 'model':221 'mortgag':1,15,37,180,201,213 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':36 'network':82 'offer':53 'one':181 'page':159,188 'paramet':170,223 'part':46 'path':42,203 'pay':8,22,57 'pay-per-cal':7,21 'pay-per-request':56 'payload':174 'payment':77,136 'per':9,23,58,116 'platform':50 'post':90 'post-method' 'price':132,164 'prompt':195 'protocol':78 'provid':33,166 'rate':149 'real estate finance API' 'record':214 'relat':38 'render':190 'request':59,91,117 'request/response':168 'requir':152 'respons':225 'return':93,208 'schema':169 'scheme':143 'servic':71 'site':127 'span':62 'spars':156 'specif':86,212 'structur':226 'subscript':147 'substant':198 'suggest':205 'uniform':129 'unit':106 'unknown':228 'usdc':14,28,84,108,118 'usdc-base' 'use':83,119 'util':70 'via':11,25,74,139 'wallet':194 'x402':12,26,76,96,141 'x402 mortgage' 'x402-payment'","prices":[{"id":"46b9cd83-7fe7-457b-89a4-fcd9a8fa9838","listingId":"614f66a6-9545-44b7-8649-f80141ca5421","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/mortgages/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:17.316Z"}],"sources":[{"listingId":"614f66a6-9545-44b7-8649-f80141ca5421","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:17.316Z","lastSeenAt":"2026-04-29T05:34:22.240Z"}],"details":{"listingId":"614f66a6-9545-44b7-8649-f80141ca5421","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/33 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/33"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/33"}],"useCases":["Retrieving mortgage record data programmatically with per-call USDC payment","Integrating mortgage information into financial dashboards or agent workflows","Querying specific mortgage details without API key registration"],"bestFor":["Developers wanting keyless, pay-per-call access to mortgage data","AI agents that can settle x402 payments on Base","Quick one-off mortgage data lookups without subscription commitments"],"notFor":["Users needing detailed API documentation or guaranteed response schemas before integrating","Bulk mortgage data retrieval where per-call pricing would be cost-prohibitive","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.226Z"},"updatedAt":"2026-04-29T05:34:22.240Z"}}