{"id":"3bc78b1e-85e7-436c-bbda-aecfbbf60cd7","shortId":"Jjbuh2","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 at the path `/api/v1/mortgages/55`. 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/55` is listed as \"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 description of what mortgage data is returned. The endpoint path suggests it may return data for a specific mortgage record (ID 55), but this is inference only. The platform's landing page confirms the $0.02/request pricing model and Base network settlement.","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 data","real estate finance API","lowpaymentfee","x402 mortgage","USDC pay-per-call"],"warnings":["No documentation available — docs, pricing, and API pages all return only 'Connect wallet'","No OpenAPI or request/response schema provided","The endpoint path '/api/v1/mortgages/55' is not listed on the provider's landing page among advertised APIs, raising questions about its purpose and availability","No examples of request body or response format exist in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/55","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of the specific /mortgages/55 path is entirely unclear. This is effectively a stub 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'/request':219 '0.02':117,218 '000':106 '0x8335':111 '20':105 '2913':112 '55':205 '6':122 'USDC pay-per-call' 'accept':94 'access':32,92,143 'advertis':142 'ai/ml':63 'analyt':62 'api':59,91,136,160 'base':5,18,79,107,114,223 'base-network' 'broader':47 'call':9,22 'chain':129 'challeng':99 'confirm':216 'connect':166 'cost':103 'crawl':156 'crypto':66 'data':2,15,37,61,188,198 'decim':123 'descript':184 'detail':173 'doc':157 'document':151 'endpoint':3,16,28,85,192 'equal':116 'extrem':153 'financ':65 'gate':71 'grant':145 'home loan data' 'id':204 'immedi':146 'indic':100 'infer':64,209 'key':137 'land':214 'limit':140 'list':88 'lowpaymentfee' 'lowpaymentfee.com':30,49 'maximum':102 'may':196 'model':221 'mortgag':1,14,35,187,202 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':80,224 'no-api-key' 'offer':51 'on-chain':127 'openapi':177 'page':161,215 'part':44 'path':40,193 'pay':7,20,56 'pay-per-cal':6,19 'pay-per-request':55 'payment':75,124,150 'per':8,21,57,118 'platform':48,212 'post':95 'premium':90 'price':158,220 'prompt':168 'protocol':76 'provid':31,132 'rate':139 'real estate finance API' 'record':203 'relat':36 'request':58,96,119 'request/response':180 'return':163,190,197 'schema':181 'servic':69 'settl':126 'settlement':225 'span':60 'spars':154 'spec':178 'specif':84,201 'suggest':194 'technic':172 'unit':108 'upon':147 'usdc':13,26,82,110,120 'usdc-settlement' 'use':81,121 'util':68 'valid':148 'varieti':53 'via':10,23,72 'wallet':134,167 'x402':11,24,74,98,149 'x402 mortgage' 'x402-payment'","prices":[{"id":"8ad7ff82-a699-4249-b1f1-a6035973cdbb","listingId":"3bc78b1e-85e7-436c-bbda-aecfbbf60cd7","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:24.583Z"}],"sources":[{"listingId":"3bc78b1e-85e7-436c-bbda-aecfbbf60cd7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:24.583Z","lastSeenAt":"2026-04-29T05:06:25.880Z"}],"details":{"listingId":"3bc78b1e-85e7-436c-bbda-aecfbbf60cd7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/55 \\\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 returns maxAmountRequired of 20000 base units of USDC on Base, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/mortgages/55"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/55"}],"useCases":["Retrieving mortgage record data programmatically with per-call payment","Integrating mortgage information into financial dashboards or agent workflows","Querying specific mortgage details without subscription or API key management"],"bestFor":["Agents or apps needing on-demand mortgage data with crypto micropayments","Developers who want keyless, pay-as-you-go API access on Base","Workflows requiring single-call financial data without rate limits"],"notFor":["Users who need detailed documentation or well-defined response schemas before integrating","Bulk mortgage data retrieval at scale (no batch endpoint documented)","Users who cannot pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.868Z"},"updatedAt":"2026-04-29T05:06:25.880Z"}}