{"id":"f791b6bc-88ea-4173-9aec-514904133117","shortId":"hU2cFL","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","tagline":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","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/42` appears to serve mortgage information (likely a specific mortgage record or calculation), payable in USDC on the Base network at $0.02 per request.\n\nThe provider operates a broader platform offering dozens of API endpoints across data & analytics, AI/ML, finance & Web3, and infrastructure categories — all priced uniformly at $0.02 per request. The x402 challenge confirms the endpoint is live, accepting POST requests, and settling payments on-chain via USDC (contract 0x8335…2913 on Base). No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/mortgages/42` endpoint actually returns. The mortgage endpoint itself is not listed on the provider's homepage among the advertised APIs, making it unclear whether this is a production endpoint or a test/demo resource. Users should expect to experiment to discover the actual input and output format.","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","x402 mortgage","pay-per-call mortgage","USDC API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","The /api/v1/mortgages/42 endpoint is not listed on the provider's homepage among advertised APIs; it may be a test or unlisted resource","No request or response schema is available; input/output format is unknown","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/42","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the mortgage endpoint is not even listed among the provider's advertised APIs. Effectively a stub 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'/request':16,32 '0.02':15,31,76,103 '0x8335':126 '2913':127 'USDC API' 'accept':114 'access':38,138 'across':90 'actual':185,224 'advertis':137,201 'ai/ml':93 'among':199 'analyt':92 'api':88,131,154,202 'appear':56 'base':5,21,73,129 'base-network' 'broader':83 'calcul':67 'call':9,25 'categori':98 'chain':122 'challeng':108 'confirm':109 'connect':162 'content':168 'contract':125 'data':2,18,43,91 'descript':179 'discov':222 'doc':152 'document':147 'dozen':86 'endpoint':3,19,34,89,111,184,189,211 'exampl':176 'expect':218 'experi':220 'extrem':149 'financ':94 'format':228 'grant':140 'header':146 'home loan API' 'homepag':198 'inform':60 'infrastructur':97 'input':225 'key':132 'like':61 'limit':135 'list':193 'live':113 'lowpaymentfee' 'lowpaymentfee.com':36 'make':203 'mortgag':1,17,41,59,64,188 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':40 'network':74 'no-api-key' 'offer':85 'on-chain':120 'openapi':172 'oper':81 'output':227 'page':157 'pay':7,23,47 'pay-per-cal':6,22 'pay-per-call mortgage' 'pay-per-request':46 'payabl':68 'payment':119,145 'per':8,24,48,77,104 'platform':84 'post':115 'price':100,153 'product':210 'prompt':164 'protocol':51 'provid':37,80,196 'pure':141 'rate':134 'readm':156 'record':65 'relat':42 'render':159 'request':49,78,105,116 'request/response':175 'resourc':54,215 'return':186 'schema':173 'serv':58 'settl':118 'spars':150 'specif':53,63 'substant':167 'test/demo':214 'unclear':205 'uniform':101 'usdc':13,29,70,124 'usdc-settlement' 'user':216 'via':10,26,44,123 'wallet':163 'web3':95 'whether':206 'x402':11,27,50,107,144 'x402 mortgage' 'x402-payment'","prices":[{"id":"b630bb87-cce6-4ed0-b17c-2c96c60aa8f4","listingId":"f791b6bc-88ea-4173-9aec-514904133117","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:12.385Z"}],"sources":[{"listingId":"f791b6bc-88ea-4173-9aec-514904133117","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:12.385Z","lastSeenAt":"2026-04-29T05:34:22.108Z"}],"details":{"listingId":"f791b6bc-88ea-4173-9aec-514904133117","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/42 \\\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":"Endpoint returns 402 with x402 challenge accepting USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/42"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/42"},{"claim":"maxAmountRequired is 20000 base units; USDC uses 6 decimals so 20000/1e6 = $0.02","source_url":"https://lowpaymentfee.com/api/v1/mortgages/42"}],"useCases":["Retrieving mortgage record or calculation data on demand","Integrating mortgage information into agent workflows without API key management","Pay-per-use access to financial data settled on Base L2"],"bestFor":["Agents needing on-demand mortgage data with crypto-native payment","Developers prototyping x402-based financial data integrations","Users who want keyless, pay-as-you-go API access"],"notFor":["Production use requiring documented schemas and guaranteed SLAs","Bulk mortgage data retrieval at scale (no documented batch support)","Users who need fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.354Z"},"updatedAt":"2026-04-29T05:34:22.108Z"}}