{"id":"0b289ace-b2a9-439f-91c9-cedf6e0e24e6","shortId":"bYxEUZ","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 (resource ID 18) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The maximum amount required per request is 20,000 base units of USDC (6 decimals), which equals $0.02 per call.\n\nThe parent site lowpaymentfee.com hosts a broad collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled on-chain via Base. The specific `/api/v1/mortgages/18` endpoint is not listed on the site's main directory, so its exact response schema and data contents are unclear. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is gated solely by the x402 micropayment.\n\nBecause the mortgage endpoint is not documented on the site's landing page or any crawled documentation page, the precise fields returned (e.g., rates, terms, lender info) cannot be confirmed. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content. Users should treat this as a lightly-documented endpoint and verify the response schema after a paid call.","tags":[],"capabilities":["x402-payment","usdc-base","mortgage-data","per-request-pricing","no-api-key","json-response"],"categories":["finance"],"synonyms":["mortgage API","mortgage rates","home loan data","mortgage information","real estate finance API","lowpaymentfee mortgages","x402 mortgage"],"warnings":["The /api/v1/mortgages/18 endpoint is not listed in the site's public API directory — its purpose and response schema are unverified.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, request schema, or response schema is available for this endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/18","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the /mortgages/18 path is not listed on the site, no documentation or response schema is available, and all doc pages returned only a wallet-connect prompt. Effectively a stub 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'0.02':80,110 '000':71 '18':40 '20':70 '402':53 '6':76 'accept':145 'access':32,159 'addit':212 'advertis':158 'ai/ml':100 'amount':65 'analyt':99 'api':96,152,201 'application/json':150 'base':5,18,61,72,119 'broad':89 'call':82,232 'cannot':194 'chain':117 'challeng':54 'collect':90 'confirm':196 'connect':207 'content':140,213 'crawl':182 'crypto':103 'data':2,15,37,98,139 'decim':77 'directori':132 'doc':198 'document':173,183,222 'e.g':189 'endpoint':3,16,28,47,123,144,170,223 'equal':79 'exact':135 'field':187 'financ':102 'gate':161 'home loan data' 'host':87 'id':39 'infer':101 'info':193 'json-response' 'key':153 'land':178 'lender':192 'light':221 'lightly-docu':220 'limit':156 'list':126 'live':49 'lowpaymentfee mortgages' 'lowpaymentfee.com':30,86 'main':131 'maximum':64 'micropay':166 'mortgag':1,14,35,169 'mortgage API' 'mortgage information' 'mortgage rates' 'mortgage-data' 'mortgage-rel':34 'network':62 'no-api-key' 'on-chain':115 'page':179,184,202 'paid':6,19,231 'parent':84 'pay':93 'pay-per-request':92 'payment':44,56 'per':8,21,67,81,94,111 'per-request':7,20 'per-request-pricing' 'post':146 'precis':186 'price':108,199 'prompt':209 'protocol':45 'provid':31 'rate':155,190 'real estate finance API' 'relat':36 'render':204 'request':9,22,68,95,112,147 'requir':55,66 'resourc':38 'respons':136,227 'return':51,149,188 'schema':137,228 'servic':106 'settl':114 'site':85,129,176 'sole':162 'span':97 'specif':121 'term':191 'treat':216 'unclear':142 'unit':73 'usdc':13,26,58,75 'usdc-base' 'user':214 'util':105 'verifi':225 'via':10,23,41,118 'wallet':208 'x402':11,24,43,165 'x402 mortgage' 'x402-payment'","prices":[{"id":"0f901595-4127-4f27-80c4-3fd4fcf25006","listingId":"0b289ace-b2a9-439f-91c9-cedf6e0e24e6","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:08.793Z"}],"sources":[{"listingId":"0b289ace-b2a9-439f-91c9-cedf6e0e24e6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:08.793Z","lastSeenAt":"2026-04-29T06:34:07.731Z"}],"details":{"listingId":"0b289ace-b2a9-439f-91c9-cedf6e0e24e6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/18 \\\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":"Endpoint returns 402 with x402 challenge requiring USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/mortgages/18"},{"claim":"Site advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/18"}],"useCases":["Retrieving mortgage data or terms for a specific mortgage record","Integrating mortgage information into financial dashboards or comparison tools","Agent-driven lookups of mortgage details without API key management"],"bestFor":["Developers needing on-demand mortgage data with no subscription","AI agents that can settle x402 micropayments on Base","Applications requiring pay-per-call access to financial data"],"notFor":["Users who need bulk mortgage data exports at scale (no documented batch endpoint)","Anyone without a Base-compatible USDC wallet for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.572Z"},"updatedAt":"2026-04-29T06:34:07.731Z"}}