{"id":"db87c4c2-55c8-413e-83e6-83ed1aa933a7","shortId":"9e7d8Q","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/24`. 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/24` 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 schema, no request/response examples, and no description of what mortgage data is returned or what parameters the POST body expects. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data fields are available or what input the endpoint requires.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","json-api","post-method"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan data","mortgage rates","real estate finance API","lowpaymentfee","x402 mortgage"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The /api/v1/mortgages/24 endpoint is not listed among the provider's advertised APIs on the homepage","Unknown what 'mortgages/24' refers to — could be a specific mortgage record ID or a category; no way to verify without docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/24","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what mortgage data is actually returned. The endpoint path '/mortgages/24' is not listed on the provider's homepage, making it unclear whether this is a production resource. Effectively a stub 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'/request':129 '0.02':113,128 '000':102 '0x8335':107 '20':101 '2913':108 '402':199 '6':118 'accept':87 'access':32 'across':132 'advertis':96 'ai/ml':63 'analyt':62 'api':59,137,155 'avail':211 'base':5,18,79,103,110 'bodi':190 'broader':47 'call':58 'challeng':95,200 'commit':145 'confirm':125 'connect':161 'content':167 'cost':99 'crypto':66 'data':2,15,37,61,182,208 'decim':119 'descript':178 'doc':152 'document':147,203 'endpoint':3,16,28,85,134,193,216 'equal':112 'exampl':175 'expect':191 'extrem':149 'field':209 'financ':65 'flat':127 'gate':71 'home loan data' 'infer':64 'input':214 'json':92 'json-api' 'key':138 'land':123 'limit':141 'live':195 'lowpaymentfee' 'lowpaymentfee.com':30,49 'maximum':98 'minimum':144 'model':131 'mortgag':1,14,35,181 'mortgage API' 'mortgage data' 'mortgage rates' 'mortgage-data' 'mortgage-rel':34 'network':80 'offer':51 'openapi':171 'page':124,156 'paramet':187 'part':44 'path':40 'pay':7,20,56 'pay-per-cal':55 'pay-per-request':6,19 'payment':75 'per':8,21,57,114 'platform':48,121 'post':88,189 'post-method' 'price':130,153 'prompt':163 'proper':198 'protocol':76 'provid':31 'rate':140 'real estate finance API' 'relat':36 'render':158 'request':9,22,89,115 'request/response':174 'requir':146,217 'return':91,184,196 'schema':172 'servic':69 'span':60 'spars':150 'specif':84 'unclear':206 'unit':104 'usdc':13,26,82,106,116 'usdc-base' 'use':81,117 'util':68 'varieti':53 'via':10,23,72 'wallet':162 'without':202 'x402':11,24,74,94 'x402 mortgage' 'x402-payment'","prices":[{"id":"296786d8-19f7-417d-bab0-17ec112c45e6","listingId":"db87c4c2-55c8-413e-83e6-83ed1aa933a7","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:12.376Z"}],"sources":[{"listingId":"db87c4c2-55c8-413e-83e6-83ed1aa933a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:12.376Z","lastSeenAt":"2026-04-29T05:34:22.062Z"}],"details":{"listingId":"db87c4c2-55c8-413e-83e6-83ed1aa933a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/24 \\\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 advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/24"},{"claim":"Platform 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":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/24"}],"useCases":["Retrieving mortgage-related data for financial analysis or comparison tools","Integrating mortgage information into automated agent workflows that can pay per call","Building real estate or lending dashboards with on-demand data"],"bestFor":["Agents or apps needing on-demand mortgage data without API key management","Developers experimenting with x402 pay-per-call protocols on Base","Low-volume consumers who prefer per-request pricing over subscriptions"],"notFor":["Users who need detailed documentation or schema before integrating","High-volume mortgage data consumers who need bulk pricing or SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.449Z"},"updatedAt":"2026-04-29T05:34:22.062Z"}}