{"id":"62bec5a1-92a8-468f-8bde-ead95ee2ad19","shortId":"zWesD6","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/50`. It is part of a broader platform offering dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint `/api/v1/mortgages/50` 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, since USDC uses 6 decimals). This matches the platform's advertised flat pricing of $0.02 per request across all endpoints. Payment is made via the x402 `exact` scheme to the specified wallet address on Base.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. 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 confirmed 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","post-endpoint"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan rates","mortgage calculator","housing finance API","real estate data","loan data endpoint"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no technical content.","No request or response schema provided; it is unknown what POST body the endpoint expects or what data it returns.","The endpoint path '/api/v1/mortgages/50' is not listed on the provider's homepage among their advertised APIs, raising questions about its status.","No OpenAPI or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/50","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/50","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 with clear pricing, but there is zero documentation on request parameters, response schema, or what 'mortgages/50' actually returns. No OpenAPI spec, no examples, and all doc pages are empty. This is effectively a stub 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'0.02':122,140 '000':117 '20':116 '402':217 '6':129 'accept':105,208 'access':34,103 'across':143 'address':158 'advertis':136 'ai/ml':62 'analyt':61 'api':3,17,58,85,102,168 'avail':229 'base':6,20,81,118,160 'base-network' 'bodi':207 'broader':49 'call':10,24 'challeng':110,218 'confirm':212 'connect':177 'cost':114 'crypto':65 'data':2,16,39,60,199,226 'decim':130 'descript':195 'detail':184 'doc':166 'document':161,221 'dozen':52 'endpoint':4,18,30,70,96,145,210,234 'exact':152 'exampl':192 'expect':235 'extrem':163 'field':227 'financ':64 'flat':137 'home loan rates' 'housing finance API' 'indic':111 'infer':63 'input':232 'key':86 'limit':89 'list':99 'live':213 'loan data endpoint' 'lowpaymentfee.com':32 'made':148 'match':132 'maximum':113 'minim':176 'mortgag':1,15,37,198 'mortgage API' 'mortgage calculator' 'mortgage data' 'mortgage-data' 'mortgage-rel':36 'network':82 'no-api-key' 'offer':51 'openapi':188 'page':171 'paramet':204 'part':46 'path':42 'pay':8,22,55 'pay-per-cal':7,21 'pay-per-request':54 'payment':74,146 'per':9,23,56,124,141 'platform':50,134 'post':106,206 'post-endpoint' 'premium':101 'price':138,167 'prompt':179 'proper':216 'protocol':75 'provid':33 'rate':88 'readm':170 'real estate data' 'relat':38 'request':57,107,125,142 'request/response':191 'requir':93 'resolv':173 'return':201,214 'schema':189 'scheme':153 'servic':68 'settl':76 'sinc':126 'span':59 'spars':164 'specif':95 'specifi':156 'subscript':92 'technic':183 'unclear':224 'unit':119 'usd':123 'usdc':14,28,78,121,127 'usdc-settlement' 'use':71,128 'util':67 'via':11,25,149 'wallet':157,178 'without':220 'x402':12,26,73,109,151 'x402-payment'","prices":[{"id":"bff6d030-fd9e-41e6-80c4-a6f3e72fd743","listingId":"62bec5a1-92a8-468f-8bde-ead95ee2ad19","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:31.203Z"}],"sources":[{"listingId":"62bec5a1-92a8-468f-8bde-ead95ee2ad19","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:31.203Z","lastSeenAt":"2026-04-29T04:33:44.540Z"}],"details":{"listingId":"62bec5a1-92a8-468f-8bde-ead95ee2ad19","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/50 \\\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 platform advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network with exact scheme.","source_url":"https://lowpaymentfee.com/api/v1/mortgages/50"},{"claim":"The endpoint accepts POST requests and returns application/json.","source_url":"https://lowpaymentfee.com/api/v1/mortgages/50"},{"claim":"Docs, pricing, API, and README pages resolve to minimal 'Connect wallet' content with no technical documentation.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage-related data or calculations programmatically","Integrating mortgage information into financial dashboards or apps","Agent-driven mortgage data lookups with micropayment settlement"],"bestFor":["Developers needing on-demand mortgage data without subscriptions","AI agents that can settle x402 payments in USDC on Base","Applications requiring pay-per-call financial data with no rate limits"],"notFor":["Users who need detailed API documentation before integrating","Bulk data consumers who need flat-rate or subscription pricing","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.534Z"},"updatedAt":"2026-04-29T04:33:44.540Z"}}