{"id":"89670ca5-dbe8-4753-b7fb-11830885eda6","shortId":"K2npFZ","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC.","tagline":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data via a pay-per-request x402 protocol. The specific resource `/api/v1/mortgages/3` is part of a broader platform that hosts dozens of API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform follow the same x402 payment model: no API keys, no rate limits, and no subscriptions — just a per-call USDC micropayment on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. The price is 20,000 base units of USDC (the asset at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request given USDC's 6 decimals. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum timeout of 300 seconds.\n\nDocumentation is extremely sparse. The `/docs`, `/pricing`, `/api`, and `/README` pages all render only a \"Connect wallet\" prompt with no actual content. There is no OpenAPI schema, no description of request parameters, and no sample responses for the mortgages endpoint specifically. The platform's homepage lists the endpoint categories but does not include `/api/v1/mortgages/3` among them, so the exact data returned (e.g., mortgage rates, loan details, amortization schedules) is unknown. Prospective callers should be prepared to experiment with POST payloads to discover the schema.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","mortgage-data","pay-per-request","no-api-key","post-endpoint"],"categories":["finance"],"synonyms":["mortgage API","mortgage rates","loan data","home loan API","x402 mortgage","USDC pay-per-call","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only a wallet connect prompt","No OpenAPI or request/response schema provided for the mortgages endpoint","The /api/v1/mortgages/3 endpoint is not listed among the provider's advertised APIs on the homepage","Exact data returned by this endpoint is unknown; callers must experiment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/3","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/3","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 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no request/response schema, and the mortgages endpoint is not even listed on the provider's homepage. The actual data returned is completely 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'/api/v1/mortgages/3':49,209 '/docs':161 '/pricing':162 '/readme':165 '0.02':132 '000':119 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':127 '20':118 '300':154 '6':138 'USDC pay-per-call' 'accept':112 'access':32 'actual':176 'address':147 'ai/ml':65 'among':210 'amort':222 'analyt':64 'api':60,84 'asset':125 'base':5,18,101,120,129 'base-network' 'broader':54 'call':9,22,96 'caller':227 'categori':204 'chain':145 'challeng':105 'confirm':106 'connect':171 'content':177 'crypto':68 'data':2,15,37,63,215 'decim':139 'descript':184 'detail':221 'discov':237 'document':156 'dozen':58 'e.g':217 'endpoint':3,16,28,61,73,108,195,203 'equal':131 'exact':214 'experi':232 'extrem':158 'financ':67 'follow':77 'given':135 'home loan API' 'homepag':200 'host':57 'includ':208 'infer':66 'key':85 'limit':88 'list':201 'live':110 'loan':220 'loan data' 'lowpaymentfee' 'lowpaymentfee.com':30 'maximum':151 'micropay':98 'model':82 'mortgag':1,14,35,194,218 'mortgage API' 'mortgage rates' 'mortgage-data' 'mortgage-rel':34 'network':102 'no-api-key' 'on-chain':143 'openapi':181 'page':166 'paramet':187 'part':51 'pay':7,20,41 'pay-per-cal':6,19 'pay-per-request':40 'payload':235 'payment':81,140 'per':8,21,42,95,133 'per-cal':94 'platform':55,76,198 'post':113,234 'post-endpoint' 'prepar':230 'price':116 'prompt':173 'prospect':226 'protocol':45 'provid':31 'rate':87,219 'relat':36 'render':168 'request':43,114,134,186 'resourc':48 'respons':191 'return':216 'sampl':190 'schedul':223 'schema':182,239 'second':155 'servic':71 'settl':142 'span':62 'spars':159 'specif':47,196 'subscript':91 'timeout':152 'unit':121 'unknown':225 'usdc':13,26,97,123,136 'usdc-micropayment' 'util':70 'via':10,23,38 'wallet':172 'x402':11,24,44,80,104 'x402 mortgage' 'x402-payment'","prices":[{"id":"e6c71a8b-f713-4a3c-8a66-472d1287b652","listingId":"89670ca5-dbe8-4753-b7fb-11830885eda6","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:19.122Z"}],"sources":[{"listingId":"89670ca5-dbe8-4753-b7fb-11830885eda6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:19.122Z","lastSeenAt":"2026-04-29T05:34:22.331Z"}],"details":{"listingId":"89670ca5-dbe8-4753-b7fb-11830885eda6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/3 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/3"},{"claim":"Platform advertises $0.02/request pricing, no API keys, no rate limits, 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/3"}],"useCases":["Retrieving mortgage-related data programmatically with per-call payment","Integrating mortgage information into financial dashboards or agent workflows","Exploring x402 micropayment-gated API access on Base"],"bestFor":["Developers experimenting with x402 pay-per-call APIs","Agents needing on-demand mortgage data without API key management","Projects already using USDC on Base for micropayments"],"notFor":["Users who need detailed API documentation before integrating","High-volume mortgage data consumers who need bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.115Z"},"updatedAt":"2026-04-29T05:34:22.331Z"}}