{"id":"5c15b158-641c-4b09-865d-bb4d176f014d","shortId":"ZVgjtR","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 the path `/api/v1/mortgages/98`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated via the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/mortgages/98` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model 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 spec, no request/response schema documentation, and no examples available. The endpoint path suggests it retrieves or processes data for a specific mortgage record (ID 98), but the exact request body format and response structure are unknown. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","real estate finance","lowpaymentfee","x402 mortgage","USDC pay-per-call"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'","No OpenAPI or schema definition; request body format and response structure are unknown","The endpoint path '/api/v1/mortgages/98' is not listed on the provider's landing page among advertised APIs, raising questions about its intended use","Purpose of this specific endpoint is inferred solely from the URL path"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/98","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of the /mortgages/98 path is entirely inferred from the URL. The docs pages are empty beyond a wallet connect 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'/request':129 '0.02':113,128 '000':102 '0x8335':107 '20':101 '2913':108 '402':216 '6':118 '98':196 'USDC pay-per-call' 'accept':87 'access':32 'across':132 'advertis':96 'ai/ml':63 'analyt':62 'api':59,137,155 'avail':180 'base':5,18,79,103,110 'base-network' 'bodi':201 'broader':47 'call':58 'challeng':95,217 'commit':145 'confirm':125,211 'connect':161 'content':167 'cost':99 'crypto':66 'data':2,15,37,61,189 'decim':119 'doc':152 'document':147,176 'endpoint':3,16,28,85,134,182,209 'equal':112 'exact':199 'exampl':179 'extrem':149 'financ':65 'flat':127 'format':202 'gate':71 'home loan API' 'id':195 'infer':64 'json':92 'json-response' 'key':138 'land':123 'limit':141 'live':212 'lowpaymentfee' 'lowpaymentfee.com':30,49 'maximum':98 'minimum':144 'model':131 'mortgag':1,14,35,193 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':80 'no-api-key' 'offer':51 'openapi':171 'page':124,156 'part':44 'path':40,183 'pay':7,20,56 'pay-per-cal':55 'pay-per-request':6,19 'payment':75 'per':8,21,57,114 'platform':48,121 'post':88 'price':130,153 'process':188 'prompt':163 'protocol':76 'provid':31 'rate':140 'real estate finance' 'record':194 'relat':36 'render':158 'request':9,22,89,115,200 'request/response':174 'requir':146 'respons':204,218 'retriev':186 'return':91 'schema':175 'servic':69 'span':60 'spars':150 'spec':172 'specif':84,192 'structur':205 'suggest':184 'unit':104 'unknown':207 'usdc':13,26,82,106,116 'usdc-settlement' 'use':81,117 'util':68 'valid':215 'varieti':53 'via':10,23,72,213 'wallet':162 'x402':11,24,74,94 'x402 mortgage' 'x402-payment'","prices":[{"id":"e6fb2ac3-57c1-42f4-807a-581b0b32966a","listingId":"5c15b158-641c-4b09-865d-bb4d176f014d","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:32.407Z"}],"sources":[{"listingId":"5c15b158-641c-4b09-865d-bb4d176f014d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:32.407Z","lastSeenAt":"2026-04-29T04:33:44.599Z"}],"details":{"listingId":"5c15b158-641c-4b09-865d-bb4d176f014d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/98 \\\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 platform charges $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/98"},{"claim":"Docs, pricing, and API pages render only a 'Connect wallet' prompt with no further documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage record data programmatically with per-call USDC payment","Integrating mortgage information into financial dashboards or agent workflows","Querying specific mortgage details without managing API keys or subscriptions"],"bestFor":["Developers or agents needing on-demand mortgage data with crypto micropayments","Projects already operating on the Base network with USDC","Use cases where keyless, commitment-free API access is preferred"],"notFor":["Users who need detailed API documentation or schema guarantees before integration","Bulk mortgage data retrieval where per-call pricing would be cost-prohibitive","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.476Z"},"updatedAt":"2026-04-29T04:33:44.599Z"}}