{"id":"ab486f60-cf4f-4b80-8f29-1163c88fff5c","shortId":"JW9Huk","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-request via x402 with USDC.","tagline":"Mortgage data endpoint on Base, pay-per-request via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/84`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs 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/84` 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). The platform's landing page confirms a flat $0.02/request pricing model across its API catalog. No API keys or rate limits are required; payment is handled entirely through the x402 payment header.\n\nDocumentation is extremely sparse. The `/docs`, `/pricing`, `/api`, and `/README` pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the mortgages endpoint actually returns. The endpoint path suggests it retrieves or processes data related to a specific mortgage record (ID 84), but the exact input parameters and response structure are unknown. The platform appears to be a generic x402 demonstration or early-stage service; treat the mortgage endpoint's actual data quality and completeness as unverified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","json-api","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","Base USDC API","real estate data"],"warnings":["No documentation available — all doc pages render only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; input parameters and response format are unknown","The endpoint path '/api/v1/mortgages/84' is not listed on the provider's landing page among advertised APIs","Data provenance and accuracy of mortgage information is completely unverified","Platform may be a demonstration or early-stage service"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/84","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/84","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 OpenAPI schema, no request/response examples, and no explanation of what the mortgages endpoint actually returns. The docs pages are empty. This is effectively a stub 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'/api/v1/mortgages/84':41,86 '/docs':158 '/pricing':159 '/readme':162 '/request':129 '0.02':113,128 '000':102 '0x8335':107 '20':101 '2913':108 '6':118 '84':209 'Base USDC API' 'accept':87 'access':32 'across':132 'actual':191,239 'advertis':96 'ai/ml':63 'analyt':62 'api':59,134,137 'appear':222 'base':5,18,79,103,110 'broader':47 'call':58 'catalog':135 'challeng':95 'complet':243 'confirm':125 'connect':168 'content':174 'cost':99 'crypto':66 'data':2,15,37,61,201,240 'decim':119 'demonstr':228 'descript':185 'document':153 'earli':231 'early-stag':230 'endpoint':3,16,28,85,190,194,237 'entir':147 'equal':112 'exact':212 'exampl':182 'extrem':155 'financ':65 'flat':127 'gate':71 'generic':226 'handl':146 'header':152 'home loan API' 'id':208 'infer':64 'input':213 'json':92 'json-api' 'key':138 'land':123 'limit':141 'lowpaymentfee' 'lowpaymentfee.com':30,49 'maximum':98 'model':131 'mortgag':1,14,35,189,206,236 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':80 'no-api-key' 'offer':51 'openapi':178 'page':124,163 'paramet':214 'part':44 'path':40,195 'pay':7,20,56 'pay-per-cal':55 'pay-per-request':6,19 'payment':75,144,151 'per':8,21,57,114 'platform':48,121,221 'post':88 'price':130 'process':200 'prompt':170 'protocol':76 'provid':31 'qualiti':241 'rate':140 'real estate data' 'record':207 'relat':36,202 'render':165 'request':9,22,89,115 'request/response':181 'requir':143 'respons':216 'retriev':198 'return':91,192 'schema':179 'servic':69,233 'span':60 'spars':156 'specif':84,205 'stage':232 'structur':217 'substant':173 'suggest':196 'treat':234 'unit':104 'unknown':219 'unverifi':245 'usdc':13,26,82,106,116 'usdc-base' 'use':81,117 'util':68 'varieti':53 'via':10,23,72 'wallet':169 'x402':11,24,74,94,150,227 'x402 mortgage' 'x402-payment'","prices":[{"id":"c28b9bf9-96f6-4d9f-9416-feed04e997b0","listingId":"ab486f60-cf4f-4b80-8f29-1163c88fff5c","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:30.638Z"}],"sources":[{"listingId":"ab486f60-cf4f-4b80-8f29-1163c88fff5c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:30.638Z","lastSeenAt":"2026-04-29T04:33:44.559Z"}],"details":{"listingId":"ab486f60-cf4f-4b80-8f29-1163c88fff5c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/84 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/84"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/84"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage record data programmatically with per-call USDC payment","Integrating mortgage information into agent workflows without API key management","Exploring x402 payment protocol integration with financial data endpoints"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents needing keyless access to mortgage data on Base","Low-volume, on-demand mortgage data lookups"],"notFor":["Production mortgage underwriting or compliance workflows (no documentation or data provenance)","High-volume bulk mortgage data retrieval (pay-per-call at $0.02 each adds up)","Users who need detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.534Z"},"updatedAt":"2026-04-29T04:33:44.559Z"}}