{"id":"c19131a1-a60b-434d-9ebb-6200de64815f","shortId":"mKz5xs","kind":"x402","title":"Mortgage data API endpoint on Base, pay-per-call via x402 with USDC.","tagline":"Mortgage data API 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/25`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request 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/25` is listed under \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is settled on-chain to the provider's wallet. No API keys or rate limits are advertised; access is granted immediately upon valid x402 payment.\n\nDocumentation is extremely sparse. The crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the exact request body format and response structure for mortgage data are unknown. The resource path suggests it may return data for a specific mortgage identified by ID 25, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC pay-per-call API","real estate finance API"],"warnings":["No documentation available — docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no technical content.","No OpenAPI or schema definition found; request body format and response structure are unknown.","The endpoint path '/api/v1/mortgages/25' is not listed on the provider's homepage among their advertised APIs, raising questions about whether it is a production endpoint or a test/demo resource.","Mortgage data may be subject to financial data regulations depending on jurisdiction."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/25","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/25","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 with a valid x402 402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The mortgage-specific functionality is entirely opaque — only the path and generic 'Premium API Access' description exist. This is effectively a stub 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'0.02':119 '000':108 '0x8335':113 '20':107 '25':228 '2913':114 '402':197 '6':124 'USDC pay-per-call API' 'accept':96 'access':34,94,145 'advertis':144 'ai/ml':65 'analyt':64 'api':3,17,61,93,138,162 'avail':188 'base':6,20,81,109,116 'base-network' 'bodi':203 'broader':49 'call':10,24 'chain':131 'challeng':101,198 'confirm':192 'connect':168 'cost':105 'crawl':158 'crypto':68 'data':2,16,39,63,210,220 'decim':125 'detail':175 'doc':159 'document':153 'endpoint':4,18,30,87,190 'equal':118 'exact':201 'exampl':186 'extrem':155 'financ':67 'format':204 'gate':73 'grant':147 'home loan API' 'id':227 'identifi':225 'immedi':148 'indic':102 'infer':66 'key':139 'limit':142 'list':90 'live':193 'lowpaymentfee' 'lowpaymentfee.com':32,51 'maximum':104 'may':218 'mortgag':1,15,37,209,224 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':36 'network':82 'no-api-key' 'offer':53 'on-chain':129 'openapi':179 'page':163 'part':46 'path':42,215 'pay':8,22,58 'pay-per-cal':7,21 'pay-per-request':57 'payload':187 'payment':77,126,152 'per':9,23,59,120 'platform':50 'post':97 'premium':92 'price':160 'prompt':170 'proper':196 'protocol':78 'provid':33,134 'rate':141 'real estate finance API' 'relat':38 'request':60,98,121,202 'request/response':182 'resourc':214 'respons':206 'return':165,194,219 'schema':183 'servic':71 'settl':128 'span':62 'spars':156 'spec':180 'specif':86,223 'specul':232 'structur':207 'suggest':216 'technic':174 'unit':110 'unknown':212 'upon':149 'usdc':14,28,84,112,122 'usdc-settlement' 'use':83,123 'util':70 'valid':150 'varieti':55 'via':11,25,74 'wallet':136,169 'x402':12,26,76,100,151 'x402 mortgage' 'x402-payment'","prices":[{"id":"1962a32b-bf88-42bc-9928-d8d9bf042521","listingId":"c19131a1-a60b-434d-9ebb-6200de64815f","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:08.784Z"}],"sources":[{"listingId":"c19131a1-a60b-434d-9ebb-6200de64815f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:08.784Z","lastSeenAt":"2026-04-29T06:34:07.674Z"}],"details":{"listingId":"c19131a1-a60b-434d-9ebb-6200de64815f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/25 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/mortgages/25"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, 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/25"}],"useCases":["Retrieving mortgage data or calculations programmatically with per-request crypto payment","Integrating mortgage information into agent workflows without managing API keys","Accessing financial data endpoints via x402 protocol on Base"],"bestFor":["Developers or agents needing on-demand mortgage data with crypto-native payment","x402-compatible agents that settle payments in USDC on Base","Use cases where keyless, pay-per-call access to financial data is preferred"],"notFor":["Users who need detailed documentation or well-defined schemas before integration","High-volume mortgage data consumers who need bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.678Z"},"updatedAt":"2026-04-29T06:34:07.674Z"}}