{"id":"b3f433f3-d132-4985-9d25-865e8fcc5939","shortId":"nJLyzN","kind":"x402","title":"Mortgage data API endpoint on Base, paid per-call with USDC via x402.","tagline":"Mortgage data API endpoint on Base, paid per-call with USDC via x402.","description":"This endpoint at `/api/v1/mortgages/8` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint appears to serve mortgage-related data, though the exact response schema and input parameters are not documented in the available crawl material. The platform advertises a uniform $0.02 per request pricing model across its endpoints, and this particular endpoint's x402 challenge confirms a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02.\n\nThe platform markets itself as requiring no API keys, no rate limits, and no commitments — callers simply attach an x402 payment header with each request. The endpoint is live and returns a proper 402 challenge when called without payment. However, documentation is extremely thin: the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no description of the mortgage data returned, and no example requests or responses available. The endpoint path `/api/v1/mortgages/8` suggests it retrieves a specific mortgage record (ID 8), but what fields are returned and what POST body (if any) is expected remain unknown.\n\nBecause the endpoint's actual functionality, input schema, and output schema are undocumented, agents should treat this as an exploratory integration. The platform hosts many other endpoints across data/analytics, AI/ML, finance, and utility categories, all at the same $0.02 price point.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","per-request-pricing","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data endpoint","home loan API","x402 mortgage","USDC pay-per-call","lowpaymentfee mortgage","real estate finance API"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet' with no content.","No OpenAPI or output schema provided; the mortgage data structure is completely unknown.","The endpoint path suggests a specific record (ID 8) but it is unclear if this is parameterized or fixed.","The POST method is indicated but no request body schema is documented.","This endpoint is not listed on the provider's homepage among their advertised APIs, raising questions about its status."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/8","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/8","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 402 challenge, confirming pricing and network. However, there is no documentation of the mortgage data returned, no input/output schema, no OpenAPI spec, and all doc pages are empty. The endpoint's purpose can only be guessed from its URL 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'0.02':92,121,269 '000':112 '20':111 '402':155 '6':117 '8':215 'USDC pay-per-call' 'across':97,258 'actual':235 'advertis':89 'agent':244 'ai/ml':260 'api':3,17,49,129,169 'appear':64 'attach':139 'avail':84,202 'base':6,20,57,113 'base-network' 'bodi':224 'broad':42 'call':10,24,158 'caller':137 'catalog':43 'categori':264 'challeng':106,156 'commit':136 'confirm':107 'connect':177 'content':183 'crawl':85 'data':2,16,70,194 'data/analytics':259 'decim':118 'descript':190 'doc':167 'document':81,162 'endpoint':4,18,30,63,99,103,148,204,233,257 'equal':120 'exact':73 'exampl':198 'expect':228 'exploratori':250 'extrem':164 'field':218 'financ':261 'function':236 'header':143 'home loan API' 'host':254 'howev':161 'id':214 'input':77,237 'integr':251 'key':130 'limit':133 'live':150 'lowpaymentfee mortgage' 'lowpaymentfee.com':37 'mani':255 'market':124 'materi':86 'maxamountrequir':109 'model':96 'mortgag':1,15,68,193,212 'mortgage API' 'mortgage data endpoint' 'mortgage-data' 'mortgage-rel':67 'network':58 'no-api-key' 'offer':40 'openapi':187 'output':240 'page':172 'paid':7,21 'paramet':78 'part':34 'particular':102 'path':205 'pay':46 'pay-per-request':45 'payment':142,160 'per':9,23,47,93 'per-cal':8,22 'per-request-pricing' 'platform':38,88,123,253 'point':271 'post':223 'price':95,168,270 'prompt':179 'proper':154 'protocol':54 'rate':132 'readm':171 'real estate finance API' 'record':213 'relat':69 'remain':229 'render':174 'request':48,94,146,199 'requir':127 'respons':74,201 'retriev':209 'return':152,195,220 'schema':75,238,241 'serv':66 'settl':50 'simpli':138 'spec':188 'specif':62,211 'substant':182 'suggest':207 'thin':165 'though':71 'treat':246 'undocu':243 'uniform':91 'unit':114 'unknown':230 'usdc':12,26,60,116 'usdc-settlement' 'use':59 'util':263 'via':13,27,51 'wallet':178 'without':159 'x402':14,28,53,105,141 'x402 mortgage' 'x402-payment'","prices":[{"id":"444cfa51-e3d9-4faf-b4da-d7196f45ed8f","listingId":"b3f433f3-d132-4985-9d25-865e8fcc5939","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:29.406Z"}],"sources":[{"listingId":"b3f433f3-d132-4985-9d25-865e8fcc5939","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:29.406Z","lastSeenAt":"2026-04-29T04:33:44.477Z"}],"details":{"listingId":"b3f433f3-d132-4985-9d25-865e8fcc5939","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/8 \\\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 per request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/mortgages/8"},{"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 record data on a per-call payment basis","Integrating mortgage information into financial dashboards without API key management","Agent-driven mortgage data lookups settled in USDC on Base"],"bestFor":["Developers wanting frictionless pay-per-call mortgage data access","AI agents that can settle x402 payments on Base","Prototyping financial applications without subscription commitments"],"notFor":["Production use requiring well-documented schemas and guaranteed SLAs","Bulk mortgage data retrieval where per-call pricing is inefficient","Users who need fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.651Z"},"updatedAt":"2026-04-29T04:33:44.477Z"}}