{"id":"06cf2248-9437-4c62-bc57-d588e3858678","shortId":"t4j35p","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC.","tagline":"Mortgage data 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/65`. 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/65` 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 displayed on the landing page. Payment is settled on-chain via the \"exact\" scheme with a 300-second timeout.\n\nNote that the endpoint path suggests it retrieves or operates on a specific mortgage record (ID 65), but no documentation, request schema, or response schema is available beyond the x402 challenge metadata. The platform's docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation it is unclear what fields the request body should contain or what the response payload looks like. The endpoint is confirmed live (returns 402 as expected for unauthenticated callers).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","json-api"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC pay-per-call","Base network API","real estate data"],"warnings":["No request or response schema available — the POST body format is unknown","All documentation pages (docs, pricing, README) return only a wallet-connect prompt with no content","The endpoint path '/api/v1/mortgages/65' implies a specific record ID but no context is provided on what data it contains","The endpoint is not listed on the provider's landing page among their advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/65","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/65","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 no documentation, no request/response schema, and no explanation of what mortgage data is returned. The docs pages are empty. This is effectively a stub 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'/request':129 '0.02':113,128 '000':102 '0x8335':107 '20':101 '2913':108 '300':148 '402':228 '6':118 '65':167 'Base network API' 'USDC pay-per-call' 'accept':87 'access':32 'advertis':96 'ai/ml':63 'analyt':62 'api':58 'avail':177 'base':5,18,79,103,110 'base-network' 'beyond':178 'bodi':212 'broader':47 'call':9,22 'caller':233 'chain':141 'challeng':95,181 'confirm':225 'connect':195 'consist':122 'contain':214 'content':201 'cost':99 'crypto':66 'data':2,15,37,61 'decim':119 'display':131 'doc':186 'document':170,204 'dozen':52 'endpoint':3,16,28,59,85,154,223 'equal':112 'exact':144 'expect':230 'field':209 'financ':65 'gate':71 'home loan API' 'id':166 'infer':64 'json':92 'json-api' 'land':134 'like':221 'live':226 'look':220 'lowpaymentfee' 'lowpaymentfee.com':30,49 'maximum':98 'metadata':182 'mortgag':1,14,35,164 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':80 'note':151 'offer':51 'on-chain':139 'oper':160 'page':135,190 'part':44 'path':40,155 'pay':7,20,55 'pay-per-cal':6,19 'pay-per-request':54 'payload':219 'payment':75,136 'per':8,21,56,114 'platform':48,125,184 'post':88 'price':130,187 'prompt':197 'protocol':76 'provid':31 'readm':189 'real estate data' 'record':165 'relat':36 'request':57,89,115,171,211 'respons':174,218 'retriev':158 'return':91,192,227 'schema':172,175 'scheme':145 'second':149 'servic':69 'settl':138 'span':60 'specif':84,163 'substant':200 'suggest':156 'timeout':150 'unauthent':232 'unclear':207 'uniform':127 'unit':104 'usdc':13,26,82,106,116 'usdc-settlement' 'use':81,117 'util':68 'via':10,23,72,142 'wallet':196 'without':202 'x402':11,24,74,94,180 'x402 mortgage' 'x402-payment'","prices":[{"id":"1dcd26d1-818e-43bb-a623-a52b78450548","listingId":"06cf2248-9437-4c62-bc57-d588e3858678","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:20.361Z"}],"sources":[{"listingId":"06cf2248-9437-4c62-bc57-d588e3858678","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:20.361Z","lastSeenAt":"2026-04-29T05:34:22.379Z"}],"details":{"listingId":"06cf2248-9437-4c62-bc57-d588e3858678","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/65 \\\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/65"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/65"},{"claim":"Platform advertises uniform $0.02/request pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only a Connect wallet prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage record details programmatically with per-call payment","Integrating mortgage data into financial dashboards without API key management","Agent-driven mortgage data lookups settled on-chain via USDC on Base"],"bestFor":["Developers needing on-demand mortgage data without subscription commitments","AI agents that can settle x402 micropayments on Base","Applications requiring keyless, pay-as-you-go access to financial data"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume batch mortgage data retrieval where per-call pricing is inefficient","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.015Z"},"updatedAt":"2026-04-29T05:34:22.379Z"}}