{"id":"187cfce3-b201-4f7a-93c8-023dd087f034","shortId":"E3hQzF","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/79`. 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 endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/mortgages/79` is listed under the provider's generic \"Premium API Access\" label. The x402 challenge confirms it is live, accepting POST requests, and requires a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the platform's uniform $0.02/request pricing across all endpoints. No API keys or rate limits are advertised; access is gated solely by the x402 micropayment.\n\nDocumentation is extremely sparse. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no description of request parameters or response format for the mortgages endpoint, and no example payloads. The endpoint path suggests it returns data about a specific mortgage record (ID 79), but the exact schema and data contents are unknown. Prospective callers should be aware that they are paying without a documented contract for what the response contains.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","rest-api","post-method"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","loan data endpoint","x402 mortgage","USDC micropayment API","lowpaymentfee","Base network API","pay-per-call finance"],"warnings":["No documentation available — docs, pricing, and README pages all return only a wallet-connect prompt","No request or response schema provided; callers cannot know what data they will receive before paying","The endpoint path /api/v1/mortgages/79 is not listed on the provider's homepage among their advertised APIs, raising questions about its intended use","No terms of service, privacy policy, or contact information found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/79","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request parameters, response schema, or what mortgage data is actually returned. No OpenAPI spec, no examples, and all doc pages are empty. This is effectively a stub 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'/request':143 '0.02':133,142 '000':116 '0x8335':121 '20':115 '2913':122 '6':128 '79':220 'Base network API' 'USDC micropayment API' 'accept':106 'access':32,97,156 'across':145 'advertis':155 'ai/ml':63 'analyt':62 'api':58,96,149 'awar':234 'base':5,18,82,117,124 'broader':47 'call':9,22 'caller':231 'challeng':101 'confirm':102 'connect':179 'consist':136 'contain':247 'content':185,227 'contract':242 'crawl':169 'crypto':66 'data':2,15,37,61,213,226 'decim':129 'descript':192 'doc':170 'document':164,241 'dozen':52 'endpoint':3,16,28,59,71,86,147,202,208 'exact':223 'exampl':205 'extrem':166 'financ':65 'format':198 'gate':158 'generic':94 'id':219 'infer':64 'key':150 'label':98 'limit':153 'list':89 'live':105 'loan data endpoint' 'lowpaymentfee' 'lowpaymentfee.com':30,49 'maximum':112 'micropay':163 'mortgag':1,14,35,201,217 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':83 'offer':51 'openapi':189 'page':174 'paramet':195 'part':44 'path':40,209 'pay':7,20,55,238 'pay-per-cal':6,19 'pay-per-call finance' 'pay-per-request':54 'payload':206 'payment':75,113 'per':8,21,56,134 'platform':48,139 'post':107 'post-method' 'premium':95 'price':144,171 'prompt':181 'prospect':230 'protocol':76 'provid':31,92 'rate':152 'readm':173 'record':218 'relat':36 'request':57,108,135,194 'requir':110 'respons':197,246 'rest-api' 'return':176,212 'schema':190,224 'servic':69 'settl':77 'sinc':125 'sole':159 'span':60 'spars':167 'specif':85,216 'substant':184 'suggest':210 'translat':131 'uniform':141 'unit':118 'unknown':229 'usdc':13,26,79,120,126 'usdc-base' 'use':72,127 'util':68 'via':10,23 'wallet':180 'without':239 'x402':11,24,74,100,162 'x402 mortgage' 'x402-payment'","prices":[{"id":"28e5c7b4-5eeb-4c65-9617-b299b4134b12","listingId":"187cfce3-b201-4f7a-93c8-023dd087f034","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:23.372Z"}],"sources":[{"listingId":"187cfce3-b201-4f7a-93c8-023dd087f034","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:23.372Z","lastSeenAt":"2026-04-29T05:06:25.876Z"}],"details":{"listingId":"187cfce3-b201-4f7a-93c8-023dd087f034","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/79 \\\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 returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/79"},{"claim":"Platform-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and README pages contain only a 'Connect wallet' prompt with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage record data programmatically with per-call USDC payment","Integrating mortgage information into agent workflows without API key management","Exploring x402 payment protocol for financial data access"],"bestFor":["Developers experimenting with x402 micropayment-gated APIs","Agents needing keyless, pay-per-call access to mortgage data","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need well-documented, schema-specified mortgage data APIs","Bulk mortgage data retrieval (pay-per-call at $0.02 adds up at scale)","Anyone requiring guaranteed SLA or support (no docs or contact info available)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.884Z"},"updatedAt":"2026-04-29T05:06:25.876Z"}}