{"id":"da8cd522-a11f-4ff9-aa13-cd4251464762","shortId":"WVBYDp","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-request via x402 with USDC.","tagline":"Mortgage data endpoint on Base, pay-per-request via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at `/api/v1/mortgages/27`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint `/api/v1/mortgages/27` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the mortgages endpoint actually returns. The endpoint name suggests mortgage financial data (possibly a specific mortgage record identified by ID 27), but the exact payload structure and semantics are unknown. The platform's landing page does not list a mortgages category at all, so this may be an unlisted or experimental endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","mortgage-data","json-response","post-method"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan data","x402 mortgage","USDC pay-per-call","lowpaymentfee","Base network API","402 payment API"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided for this endpoint","The /api/v1/mortgages/ path is not listed among the provider's advertised API categories, suggesting it may be unlisted or experimental","Exact data returned by this endpoint is unknown — 'mortgages/27' semantics are inferred only from the URL path"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/27","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the mortgages endpoint is not even listed on the provider's landing page. The actual data returned is completely 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'0.02':115,122 '000':106 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':97 '20':105 '27':194 '402 payment API' '6':111 'Base network API' 'USDC pay-per-call' 'accept':83 'access':32 'across':125 'actual':177 'advertis':119 'ai/ml':61 'amount':100 'analyt':60 'api':56,130,148 'base':5,18,77,95,107 'base-network' 'broader':45 'call':55,103 'categori':214 'commit':138 'connect':154 'content':160 'contract':96 'crypto':64 'data':2,15,37,59,185 'decim':112 'descript':171 'doc':145 'document':140 'dozen':50 'endpoint':3,16,28,57,81,127,176,180,225 'equal':114 'exact':197 'exampl':168 'experiment':224 'extrem':142 'financ':63 'financi':184 'flat':121 'gate':69 'home loan data' 'id':193 'identifi':191 'infer':62 'json':88 'json-response' 'key':131 'land':207 'limit':134 'list':211 'lowpaymentfee' 'lowpaymentfee.com':30,47 'maximum':99 'may':219 'minimum':137 'mortgag':1,14,35,175,183,189,213 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'name':181 'network':78 'offer':49 'openapi':164 'page':149,208 'part':42 'pay':7,20,53 'pay-per-cal':52 'pay-per-request':6,19 'payload':198 'payment':73,89 'per':8,21,54,102,123 'platform':46,118,205 'possibl':186 'post':84 'post-method' 'price':146 'prompt':156 'protocol':74 'provid':31 'rate':133 'record':190 'relat':36 'render':151 'request':9,22,85,124 'request/response':167 'requir':101,139 'return':87,178 'schema':165 'semant':201 'servic':67 'settl':91 'span':58 'spars':143 'specif':80,188 'structur':199 'suggest':182 'unit':108 'unknown':203 'unlist':222 'usd':116 'usdc':13,26,93,110 'usdc-settlement' 'util':66 'via':10,23,70 'wallet':155 'x402':11,24,72 'x402 mortgage' 'x402-payment'","prices":[{"id":"d21703d0-2cd0-4c27-8be1-53c6746d3f92","listingId":"da8cd522-a11f-4ff9-aa13-cd4251464762","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:17.918Z"}],"sources":[{"listingId":"da8cd522-a11f-4ff9-aa13-cd4251464762","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:17.918Z","lastSeenAt":"2026-04-29T05:34:22.279Z"}],"details":{"listingId":"da8cd522-a11f-4ff9-aa13-cd4251464762","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/27 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/27"},{"claim":"The platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/27"},{"claim":"The mortgages endpoint is not listed among the provider's advertised API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving mortgage financial data on a per-request basis without API key registration","Integrating mortgage information into agent workflows that can settle payments via x402 on Base","Programmatic access to mortgage records for financial analysis or comparison tools"],"bestFor":["Agents or applications that can pay per-call via x402/USDC on Base","Developers wanting keyless, commitment-free access to mortgage data","Automated financial data pipelines that need on-demand mortgage information"],"notFor":["Users who need detailed documentation or schema guarantees before integration","Bulk mortgage data retrieval (no batch endpoint documented)","Users without Base network USDC for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.128Z"},"updatedAt":"2026-04-29T05:34:22.279Z"}}