{"id":"2bde39db-9391-44c5-82a4-3c1df0d33e2c","shortId":"teMaVc","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/56`. 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/56` is listed under the title \"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 instantly upon valid x402 payment.\n\nDocumentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what mortgage data fields are returned. The endpoint path suggests it retrieves data for a specific mortgage record (ID 56), but the exact schema and semantics are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","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","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or output schema provided; request body format and response fields are unknown","The endpoint path '/api/v1/mortgages/56' with a hardcoded ID suggests this may be a demo or placeholder rather than a production data source","Mortgage data endpoints may involve regulated financial information — verify compliance before use"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/56","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/56","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, confirming it is operational. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific purpose of '/api/v1/mortgages/56' is unclear — it could be a demo or placeholder. Docs pages return only 'Connect wallet' with no 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'0.02':119 '000':108 '0x8335':113 '20':107 '2913':114 '56':211 '6':124 'Base network API' 'USDC pay-per-call' 'accept':96 'access':32,94,145 'addit':177 'advertis':144 'ai/ml':63 'analyt':62 'api':59,93,138,163 'base':5,18,79,109,116 'beyond':154 'broader':47 'call':9,22 'chain':131 'challeng':101 'connect':172 'cost':105 'crypto':66 'data':2,15,37,61,194,204 'decim':125 'descript':190 'detail':179 'doc':162 'document':153 'endpoint':3,16,28,85,199 'equal':118 'exact':214 'exampl':187 'extrem':159 'field':195 'financ':65 'gate':71 'grant':147 'home loan API' 'id':210 'indic':102 'infer':64 'instant':148 'key':139 'land':156 'limit':142 'list':88 'lowpaymentfee' 'lowpaymentfee.com':30,49 'maximum':104 'mortgag':1,14,35,193,208 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':80 'no-api-key' 'offer':51 'on-chain':129 'openapi':183 'page':157,167 'part':44 'path':40,200 'pay':7,20,56 'pay-per-cal':6,19 'pay-per-request':55 'payment':75,126,152 'per':8,21,57,120 'platform':48 'post':97 'premium':92 'price':164 'prompt':174 'protocol':76 'provid':31,134 'rate':141 'readm':166 'record':209 'relat':36 'render':169 'request':58,98,121 'request/response':186 'retriev':203 'return':197 'schema':184,215 'semant':217 'servic':69 'settl':128 'span':60 'spars':160 'specif':84,207 'suggest':201 'technic':178 'titl':91 'unit':110 'unknown':219 'upon':149 'usdc':13,26,82,112,122 'usdc-base' 'use':81,123 'util':68 'valid':150 'varieti':53 'via':10,23,72 'wallet':136,173 'x402':11,24,74,100,151 'x402 mortgage' 'x402-payment'","prices":[{"id":"c453a993-8ece-4c85-a0b5-6e4bcfc81df7","listingId":"2bde39db-9391-44c5-82a4-3c1df0d33e2c","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:28.197Z"}],"sources":[{"listingId":"2bde39db-9391-44c5-82a4-3c1df0d33e2c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:28.197Z","lastSeenAt":"2026-04-29T04:33:44.477Z"}],"details":{"listingId":"2bde39db-9391-44c5-82a4-3c1df0d33e2c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/56 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/56"},{"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/56"}],"useCases":["Retrieving mortgage record data programmatically with per-call USDC payment","Integrating mortgage information into agent workflows without API key management","Accessing financial data endpoints via x402 protocol on Base"],"bestFor":["Agents or apps needing on-demand mortgage data with crypto micropayments","Developers experimenting with x402 pay-per-call patterns","Use cases where API-key-free, pay-as-you-go access is preferred"],"notFor":["Users needing comprehensive mortgage analytics or bulk data exports (no evidence of batch support)","Anyone requiring detailed API documentation or guaranteed SLAs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.652Z"},"updatedAt":"2026-04-29T04:33:44.477Z"}}