{"id":"a8cefe42-00b8-4257-9789-8aa8cc77d606","shortId":"CFZTtH","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 (specifically resource ID 43) 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 USD per call.\n\nThe provider lowpaymentfee.com hosts a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific mortgage endpoint (/api/v1/mortgages/43) is not listed on the provider's landing page among the advertised API categories, so its exact response schema and data content are unclear. The endpoint accepts POST requests and returns application/json.\n\nPayment is settled on the Base L2 network using USDC (contract 0x8335…2913) to address 0x1A2B…85F3, with a maximum timeout of 300 seconds. No OpenAPI schema, detailed documentation, or example responses were found in the crawl. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","mortgage-data","pay-per-request","json-response","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan data","real estate finance API","lowpaymentfee","x402 mortgage","Base USDC API"],"warnings":["The /api/v1/mortgages/43 endpoint is not listed among the provider's advertised APIs on the landing page — its purpose and data content are unverified.","No OpenAPI schema, request body schema, or response schema available.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","The specific data returned by this mortgage endpoint is unknown; 'mortgages/43' could be a single static record or a parameterized resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/43","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/43","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 there is no documentation, no OpenAPI schema, no example request/response, and the specific mortgage endpoint is not even listed on the provider's own landing page. The crawled docs/pricing/API pages were empty beyond a wallet connect prompt. Effectively a stub 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'0.02':81,111 '000':72 '0x1a2b':178 '0x8335':174 '20':71 '2913':175 '300':185 '402':54 '43':41 '6':77 '85f3':179 'Base USDC API' 'accept':157 'access':32 'addit':215 'address':177 'advertis':142 'ai/ml':101 'among':140 'amount':66 'analyt':100 'api':97,116,143,204 'application/json':162 'base':5,18,62,73,168 'broad':90 'call':84 'catalog':91 'categori':144 'challeng':55 'commit':124 'connect':210 'content':152,216 'contract':173 'crawl':199 'crypto':104 'data':2,15,37,99,151 'decim':78 'detail':190 'doc':201 'document':191 'endpoint':3,16,28,48,129,156 'equal':80 'exact':147 'exampl':193 'financ':103 'found':196 'home loan data' 'host':88 'howev':125 'id':40 'infer':102 'json-response' 'key':117 'l2':169 'land':138 'limit':120 'list':133 'live':50 'lowpaymentfee' 'lowpaymentfee.com':30,87 'maximum':65,182 'minimum':123 'mortgag':1,14,35,128 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':63,170 'no-api-key' 'openapi':188 'page':139,205 'paid':6,19 'pay':94 'pay-per-request':93 'payment':45,57,163 'per':8,21,68,83,95,112 'per-request':7,20 'post':158 'price':109,202 'prompt':212 'protocol':46 'provid':31,86,136 'rate':119 'real estate finance API' 'relat':36 'render':207 'request':9,22,69,96,113,159 'requir':56,67 'resourc':39 'respons':148,194 'return':52,161 'schema':149,189 'second':186 'servic':107 'settl':165 'span':98 'specif':38,127 'timeout':183 'unclear':154 'unit':74 'usd':82 'usdc':13,26,59,76,172 'usdc-base' 'use':171 'util':106 'via':10,23,42 'wallet':211 'x402':11,24,44 'x402 mortgage' 'x402-payment'","prices":[{"id":"49655fe2-fe49-43c1-a4dd-fac6ce4ab6e3","listingId":"a8cefe42-00b8-4257-9789-8aa8cc77d606","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:18.549Z"}],"sources":[{"listingId":"a8cefe42-00b8-4257-9789-8aa8cc77d606","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:18.549Z","lastSeenAt":"2026-04-29T05:34:22.309Z"}],"details":{"listingId":"a8cefe42-00b8-4257-9789-8aa8cc77d606","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/43 \\\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 endpoint returns a 402 challenge requiring USDC payment on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/mortgages/43"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/43"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The mortgage endpoint is not listed among the provider's advertised API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving mortgage data for a specific mortgage record (ID 43)","Integrating mortgage information into financial analysis pipelines","Agent-driven lookups of mortgage details with micropayments"],"bestFor":["Agents needing on-demand mortgage data without API key management","Developers experimenting with x402 pay-per-request protocols","Low-volume, pay-as-you-go mortgage data access"],"notFor":["Bulk mortgage data downloads or batch processing (no documented bulk endpoints)","Users who need detailed documentation or guaranteed SLAs before integrating","Non-crypto users who cannot pay via USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.125Z"},"updatedAt":"2026-04-29T05:34:22.309Z"}}