{"id":"5269b02b-fcde-4d21-966e-1d85fb78d00d","shortId":"672EtL","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 via a pay-per-call x402 protocol. The specific resource `/api/v1/mortgages/10` appears to return mortgage information (likely for a specific mortgage record or product with ID 10) in JSON format. Payment is settled on the Base network using USDC (contract 0x8335…2913) at $0.02 per request.\n\nThe broader lowpaymentfee.com platform hosts a variety of x402-gated API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per call. The platform advertises no API keys, no rate limits, and instant access; callers simply attach an x402 payment header to each request. However, documentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation describing what the mortgages endpoint actually returns, the exact data model and input parameters are unknown. The endpoint accepts POST requests and returns application/json. Callers should be prepared to experiment or contact the provider for schema details.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","json-api","pay-per-request"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC API","Base network API","real estate data"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only a 'Connect wallet' prompt with no technical content.","No OpenAPI or JSON schema describing request parameters or response format for the mortgages endpoint.","The exact data returned by /api/v1/mortgages/10 is unknown; 'mortgages' is inferred from the URL path only.","Mortgage/financial data may be subject to regulatory requirements depending on jurisdiction and use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/10","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs pages all show only 'Connect wallet'. The purpose of the mortgages endpoint is inferred from the URL path 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'/api/v1/mortgages/10':49 '/docs':142 '/pricing':143 '/readme':146 '0.02':82,111 '0x8335':79 '10':65 '2913':80 'Base network API' 'USDC API' 'accept':190 'access':32,125 'actual':177 'advertis':116 'ai/ml':101 'analyt':100 'api':96,118 'appear':50 'application/json':195 'attach':128 'base':5,18,74 'base-network' 'broader':86 'call':43,113 'caller':126,196 'connect':152 'contact':203 'contract':78 'crypto':104 'data':2,15,37,99,181 'describ':172 'detail':159,208 'document':137,171 'endpoint':3,16,28,97,176,189 'exact':180 'exampl':168 'experi':201 'extrem':139 'financ':103 'format':68 'gate':95 'header':132 'home loan API' 'host':89 'howev':136 'id':64 'infer':102 'inform':54 'input':184 'instant':124 'json':67 'json-api' 'key':119 'like':55 'limit':122 'lowpaymentfee' 'lowpaymentfee.com':30,87 'model':182 'mortgag':1,14,35,53,59,175 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':75 'openapi':164 'page':147 'paid':6,19 'paramet':185 'pay':41 'pay-per-cal':40 'pay-per-request' 'payment':69,131 'per':8,21,42,83,112 'per-request':7,20 'platform':88,115 'post':191 'prepar':199 'price':109 'product':62 'prompt':154 'protocol':45 'provid':31,205 'rate':121 'real estate data' 'record':60 'relat':36 'render':149 'request':9,22,84,135,192 'request/response':167 'resourc':48 'return':52,178,194 'schema':165,207 'servic':107 'settl':71 'simpli':127 'span':98 'spars':140 'specif':47,58 'technic':158 'unknown':187 'usdc':13,26,77 'usdc-settlement' 'use':76 'util':106 'varieti':91 'via':10,23,38 'wallet':153 'x402':11,24,44,94,130 'x402 mortgage' 'x402-gated':93 'x402-payment'","prices":[{"id":"9e2cbd4b-b158-4059-83b9-21b96e5f08d1","listingId":"5269b02b-fcde-4d21-966e-1d85fb78d00d","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:15.476Z"}],"sources":[{"listingId":"5269b02b-fcde-4d21-966e-1d85fb78d00d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:15.476Z","lastSeenAt":"2026-04-29T05:34:22.143Z"}],"details":{"listingId":"5269b02b-fcde-4d21-966e-1d85fb78d00d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/10 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/10"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/10"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage data or calculations programmatically","Integrating mortgage information into financial dashboards","Agent-driven lookups of mortgage product details"],"bestFor":["Developers needing on-demand mortgage data without API key management","AI agents that can settle x402 payments on Base","Applications requiring low-cost per-call financial data"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Bulk data export of large mortgage datasets (no batch endpoint documented)","Anyone unable to transact USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.341Z"},"updatedAt":"2026-04-29T05:34:22.143Z"}}