{"id":"fc0e27e9-3de0-4700-a5f5-449239a099d0","shortId":"M87udS","kind":"x402","title":"Mortgage data endpoint on Base, paid per-request via x402 with USDC.","tagline":"Mortgage data endpoint on Base, paid per-request via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/31`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/mortgages/31` is listed under \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request, consistent with the site's uniform $0.02/request pricing). Payment is made on-chain to the specified wallet address on Base, with no API keys or rate limits required. The platform advertises instant access with no minimums or commitments.\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 mortgage data is returned or what parameters the POST body accepts. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data fields are available or what input the endpoint expects.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan data","real estate finance API","lowpaymentfee","x402 mortgage","USDC mortgage endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; unknown what POST body is expected or what data is returned.","The endpoint path '/api/v1/mortgages/31' is not listed on the site's homepage among its advertised APIs, raising questions about its purpose.","Cannot verify what 'mortgages/31' refers to — could be a specific mortgage record, a calculation endpoint, or something else entirely."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/31","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on request parameters, response schema, or what mortgage data is actually returned. The docs/pricing/README pages are all blank beyond a wallet connect prompt. This is effectively a stub 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'/request':121 '0.02':110,120 '000':105 '20':104 '402':207 'USDC mortgage endpoint' 'accept':93,199 'access':32,91,148 'address':133 'advertis':146 'ai/ml':63 'analyt':62 'api':58,90,138,161 'avail':219 'base':5,18,78,106,135 'base-network' 'bodi':198 'broader':47 'call':57 'chain':128 'challeng':98,208 'commit':153 'connect':169 'consist':114 'content':175 'cost':102 'crypto':66 'data':2,15,37,61,190,216 'descript':186 'doc':159 'document':154,211 'dozen':52 'endpoint':3,16,28,59,84,201,224 'exampl':183 'expect':225 'extrem':156 'field':217 'financ':65 'home loan data' 'indic':99 'infer':64 'input':222 'instant':147 'key':139 'limit':142 'list':87 'live':203 'lowpaymentfee' 'lowpaymentfee.com':30,49 'made':125 'maximum':101 'minimum':151 'mortgag':1,14,35,189 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':79 'no-api-key' 'offer':51 'on-chain':126 'openapi':179 'page':164 'paid':6,19 'paramet':195 'part':44 'path':40 'pay':55 'pay-per-cal':54 'pay-per-request' 'payment':123 'per':8,21,56,112 'per-request':7,20 'platform':48,145 'post':94,197 'premium':89 'price':122,160 'prompt':171 'proper':206 'protocol':75 'provid':31 'rate':141 'readm':163 'real estate finance API' 'relat':36 'render':166 'request':9,22,95,113 'request/response':182 'requir':143 'return':192,204 'schema':180 'servic':69 'settl':71 'site':117 'span':60 'spars':157 'specif':83 'specifi':131 'substant':174 'unclear':214 'uniform':119 'unit':107 'usd':111 'usdc':13,26,81,109 'usdc-settlement' 'use':80 'util':68 'via':10,23,72 'wallet':132,170 'without':210 'x402':11,24,74,97 'x402 mortgage' 'x402-payment'","prices":[{"id":"996a55c3-310f-44ce-af06-5c2fca2337a4","listingId":"fc0e27e9-3de0-4700-a5f5-449239a099d0","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:14.153Z"}],"sources":[{"listingId":"fc0e27e9-3de0-4700-a5f5-449239a099d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:14.153Z","lastSeenAt":"2026-04-29T05:34:22.143Z"}],"details":{"listingId":"fc0e27e9-3de0-4700-a5f5-449239a099d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/31 \\\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":"The site advertises $0.02 per 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 (USD Coin, 6 decimals = $0.02) on the Base network.","source_url":"https://lowpaymentfee.com/api/v1/mortgages/31"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no substantive documentation.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage data or calculations programmatically","Integrating mortgage information into financial dashboards","Agent-driven mortgage data lookups with micropayments"],"bestFor":["Developers needing on-demand mortgage data without subscription commitments","AI agents that can settle x402 payments on Base","Applications requiring pay-per-call financial data access"],"notFor":["Users who need detailed API documentation before integrating","Bulk mortgage data retrieval (no documented batch support)","Non-crypto payment workflows (only USDC on Base is accepted)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.343Z"},"updatedAt":"2026-04-29T05:34:22.143Z"}}