{"id":"b1ef04f2-60e7-49a2-bc97-6d2309c6bba7","shortId":"Cup5wZ","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-call with USDC via x402.","tagline":"Mortgage data endpoint on Base, pay-per-call with USDC via x402.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/81`. 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/81` 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 platform's uniform $0.02/request pricing shown on the landing page. Payment is made inline via the X-PAYMENT header; no API keys or accounts are required.\n\nThe endpoint's exact response schema is not documented — the crawled docs, pricing, and README pages all returned only a wallet-connect stub with no further detail. The mortgage resource ID \"81\" suggests this may return data for a specific mortgage record or calculation, but without documentation or example responses, the precise payload structure is unknown. The platform advertises no rate limits and instant access.","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","USDC API","Base network API","pay-per-call mortgage"],"warnings":["No API documentation available — docs, pricing, and README pages return only a wallet-connect stub","No request body schema or response schema documented for /api/v1/mortgages/81","The specific meaning of resource ID '81' is unknown","The endpoint path '/api/v1/mortgages/81' does not appear in the site's listed API catalog, raising questions about its provenance"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/81","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/81","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 captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no request/response schema, and the mortgage-specific functionality is entirely undocumented. The docs, pricing, and README pages all returned only a wallet-connect stub with no useful 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'/request':129 '0.02':113,128 '000':102 '0x8335':107 '20':101 '2913':108 '6':118 '81':185 'Base network API' 'USDC API' 'accept':87 'access':32,218 'account':150 'advertis':96,212 'ai/ml':63 'analyt':62 'api':58,147 'base':5,18,79,103,110 'broader':47 'calcul':197 'call':9,22 'challeng':95 'connect':175 'consist':122 'cost':99 'crawl':163 'crypto':66 'data':2,15,37,61,190 'decim':119 'detail':180 'doc':164 'document':161,200 'dozen':52 'endpoint':3,16,28,59,85,154 'equal':112 'exact':156 'exampl':202 'financ':65 'gate':71 'header':145 'home loan API' 'id':184 'infer':64 'inlin':139 'instant':217 'json':92 'json-api' 'key':148 'land':134 'limit':215 'lowpaymentfee' 'lowpaymentfee.com':30,49 'made':138 'maximum':98 'may':188 'mortgag':1,14,35,182,194 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':80 'no-api-key' 'offer':51 'page':135,168 'part':44 'path':40 'pay':7,20,55 'pay-per-cal':6,19 'pay-per-call mortgage' 'pay-per-request':54 'payload':206 'payment':75,136,144 'per':8,21,56,114 'platform':48,125,211 'post':88 'precis':205 'price':130,165 'protocol':76 'provid':31 'rate':214 'readm':167 'record':195 'relat':36 'request':57,89,115 'requir':152 'resourc':183 'respons':157,203 'return':91,170,189 'schema':158 'servic':69 'shown':131 'span':60 'specif':84,193 'structur':207 'stub':176 'suggest':186 'uniform':127 'unit':104 'unknown':209 'usdc':11,24,82,106,116 'usdc-base' 'use':81,117 'util':68 'via':12,25,72,140 'wallet':174 'wallet-connect':173 'without':199 'x':143 'x-payment':142 'x402':13,26,74,94 'x402 mortgage' 'x402-payment'","prices":[{"id":"a5d91ebb-8f2a-474c-b845-5331d8a0de1b","listingId":"b1ef04f2-60e7-49a2-bc97-6d2309c6bba7","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:24.583Z"}],"sources":[{"listingId":"b1ef04f2-60e7-49a2-bc97-6d2309c6bba7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:24.583Z","lastSeenAt":"2026-04-29T05:06:25.856Z"}],"details":{"listingId":"b1ef04f2-60e7-49a2-bc97-6d2309c6bba7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/81 \\\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 platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/mortgages/81"},{"claim":"Docs, pricing, and README pages returned only a wallet-connect stub with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage record or calculation data programmatically","Integrating mortgage information into financial dashboards","Agent-driven mortgage data lookups with automatic micropayment"],"bestFor":["Developers needing on-demand mortgage data without subscription commitments","AI agents that can settle x402 USDC payments on Base","Applications requiring low-cost, keyless API access to financial data"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Bulk mortgage data retrieval where per-request pricing would be costly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.884Z"},"updatedAt":"2026-04-29T05:06:25.856Z"}}