{"id":"a45dac56-2a95-42d9-b266-8e2be120e689","shortId":"sG2dcJ","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 via a pay-per-request x402 protocol. The specific resource `/api/v1/mortgages/5` is accessed via HTTP POST and returns JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform hosts a variety of x402-gated endpoints spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities — all priced uniformly at $0.02 per request. However, the `/api/v1/mortgages/5` path is not listed on the site's landing page among the advertised API categories, so its exact response schema and data content are unclear. The endpoint is live and returns a proper 402 challenge, confirming it is operational.\n\nBecause no OpenAPI schema, documentation, or example responses are available for this specific mortgage endpoint, the precise fields returned are unknown. Callers should expect a JSON payload related to mortgage data (possibly a specific mortgage record identified by ID 5), but the structure must be discovered empirically.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","real estate finance","x402 mortgage","USDC pay-per-call","lowpaymentfee"],"warnings":["The /api/v1/mortgages/5 endpoint is not listed among the provider's advertised APIs on the landing page — it may be undocumented or experimental.","No response schema or example output is available; the data structure must be discovered by making a paid request.","Documentation pages (/docs, /api, /pricing, /README) all returned only a 'Connect wallet' prompt with no substantive content.","Mortgage data may be subject to financial data regulations depending on jurisdiction and content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/5","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/5","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 402 challenge, but there is no documentation, no OpenAPI schema, no example responses, and the /mortgages/5 path is not listed among the site's advertised APIs. The actual data returned is entirely unknown, making this effectively a stub 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'0.02':73,131 '000':77 '20':76 '402':170 '5':215 '6':81 'USDC pay-per-call' 'access':32,51 'advertis':149 'ai/ml':120 'among':147 'analyt':119 'api':84,150 'attach':93 'avail':185 'base':5,18,63,78 'base-network' 'broader':106 'call':9,22 'caller':91,197 'categori':151 'challeng':171 'coin':68 'confirm':172 'content':159 'cost':71 'data':2,15,37,118,158,206 'decim':82 'discov':221 'document':180 'empir':222 'endpoint':3,16,28,116,163,190 'exact':154 'exampl':182 'expect':199 'field':193 'financ':122 'gate':115 'header':98 'home loan API' 'host':109 'howev':134 'http':53 'id':214 'identifi':212 'infer':121 'infrastructur':125 'json':57,201 'json-response' 'key':85 'land':145 'limit':88 'list':140 'live':165 'lowpaymentfee' 'lowpaymentfee.com':30,107 'mortgag':1,14,35,189,205,210 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'must':219 'network':64 'no-api-key' 'openapi':178 'oper':175 'page':146 'path':137 'pay':7,20,41 'pay-per-cal':6,19 'pay-per-request':40 'payload':202 'payment':58,97,103 'per':8,21,42,74,132 'platform':108 'possibl':207 'post':54 'precis':192 'price':128 'proof':104 'proper':169 'protocol':45 'provid':31 'rate':87 'real estate finance' 'record':211 'relat':36,203 'request':43,75,133 'requir':90 'resourc':48 'respons':155,183 'return':56,167,194 'schema':156,179 'settl':60 'simpli':92 'site':143 'span':117 'specif':47,188,209 'structur':218 'unclear':161 'uniform':129 'unit':79 'unknown':196 'usd':67 'usdc':13,26,66 'usdc-settlement' 'use':65 'util':126 'valid':101 'varieti':111 'via':10,23,38,52 'web3':123 'x':96 'x-payment':95 'x402':11,24,44,102,114 'x402 mortgage' 'x402-gated':113 'x402-payment'","prices":[{"id":"3fd41d8c-363a-481f-98f0-3517725a5bdb","listingId":"a45dac56-2a95-42d9-b266-8e2be120e689","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:19.721Z"}],"sources":[{"listingId":"a45dac56-2a95-42d9-b266-8e2be120e689","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:19.721Z","lastSeenAt":"2026-04-29T05:34:22.332Z"}],"details":{"listingId":"a45dac56-2a95-42d9-b266-8e2be120e689","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/5 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge on POST, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/mortgages/5"},{"claim":"Payment is 20,000 base units of USDC on Base network (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/mortgages/5"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/mortgages/5 path is not listed among the site's advertised API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving mortgage record data programmatically with per-call payment","Integrating mortgage information into financial analysis pipelines","Agent-driven lookup of mortgage details without pre-registration"],"bestFor":["Developers needing on-demand mortgage data without subscription commitments","AI agents that can settle x402 payments on Base with USDC","Applications requiring pay-as-you-go access to financial records"],"notFor":["Bulk mortgage data downloads (pay-per-request model may be costly at scale)","Users who cannot transact on the Base L2 network with USDC"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.114Z"},"updatedAt":"2026-04-29T05:34:22.332Z"}}