{"id":"fff0e78f-a502-4cdf-8810-ab2569977c6e","shortId":"ekqRbN","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-call with USDC via x402 protocol.","tagline":"Mortgage data endpoint on Base, pay-per-call with USDC via x402 protocol.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/69`. 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.\n\nThe specific endpoint `/api/v1/mortgages/69` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. This is consistent with the platform's uniform $0.02/request pricing across all listed endpoints. No API keys or rate limits are advertised; access is granted immediately upon valid x402 payment.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint path suggests it returns data about a specific mortgage record (ID 69), but the exact fields, input parameters, and response structure are unknown. The platform appears to be a demonstration or early-stage deployment of x402-gated APIs.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","json-response","post-method"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","loan data endpoint","x402 mortgage","USDC pay-per-call","lowpaymentfee","Base network API","real estate data"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content","The /api/v1/mortgages/69 path is not listed among the platform's advertised endpoints, suggesting it may be a test or unlisted resource","Platform appears to be early-stage or a demo deployment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/69","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/69","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 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty stubs. The specific purpose of the /mortgages/69 endpoint is unclear beyond the URL path. This is effectively a stub 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'/request':130 '0.02':119,129 '000':110 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':101 '20':109 '6':115 '69':204 'Base network API' 'USDC pay-per-call' 'accept':87 'access':34,144 'across':132 'addit':175 'advertis':143 'ai/ml':65 'amount':104 'analyt':64 'api':61,137,162,232 'appear':218 'avail':190 'base':5,19,81,99,111 'broader':49 'call':9,23,107 'connect':170 'consist':123 'contract':100 'crypto':68 'data':2,16,39,63,197 'decim':116 'demonstr':222 'deploy':227 'detail':177 'doc':160 'document':152 'earli':225 'early-stag':224 'endpoint':3,17,30,85,135,192 'equal':118 'exact':207 'exampl':188 'extrem':157 'field':208 'financ':67 'gate':73,231 'grant':146 'id':203 'immedi':147 'infer':66 'input':209 'json':92 'json-response' 'key':138 'limit':141 'list':134 'loan data endpoint' 'lowpaymentfee' 'lowpaymentfee.com':32,51 'maximum':103 'mortgag':1,15,37,201 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':36 'network':82 'offer':53 'openapi':181 'page':165 'paramet':210 'part':46 'path':42,193 'pay':7,21,58 'pay-per-cal':6,20 'pay-per-request':57 'payload':189 'payment':77,93,151 'per':8,22,59,106 'platform':50,126,217 'post':88 'post-method' 'price':131,161 'prompt':172 'protocol':14,28,78 'provid':33 'rate':140 'readm':164 'real estate data' 'record':202 'relat':38 'render':167 'request':60,89 'request/response':184 'requir':105 'respons':212 'return':91,196 'schema':185 'servic':71 'settl':95 'site':155 'span':62 'spec':182 'specif':84,200 'stage':226 'structur':213 'suggest':194 'technic':176 'thin':158 'uniform':128 'unit':112 'unknown':215 'upon':148 'usd':120 'usdc':11,25,97,114 'usdc-base' 'util':70 'valid':149 'varieti':55 'via':12,26,74 'wallet':171 'x402':13,27,76,150,230 'x402 mortgage' 'x402-gated':229 'x402-payment'","prices":[{"id":"fde27c2c-ff37-414e-97e6-06266002bf3f","listingId":"fff0e78f-a502-4cdf-8810-ab2569977c6e","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:32.407Z"}],"sources":[{"listingId":"fff0e78f-a502-4cdf-8810-ab2569977c6e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:32.407Z","lastSeenAt":"2026-04-29T04:33:44.580Z"}],"details":{"listingId":"fff0e78f-a502-4cdf-8810-ab2569977c6e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/69 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/69"},{"claim":"Platform-wide pricing is $0.02 per request with no API keys, no rate limits, and 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/69"}],"useCases":["Retrieving mortgage record data programmatically with per-call USDC payment","Integrating mortgage information into agent workflows without API key management","Demonstrating x402 protocol payment flows for financial data access"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand mortgage data without subscription commitments","Projects requiring keyless, pay-per-use financial data endpoints"],"notFor":["Production systems requiring documented request/response schemas","Bulk mortgage data retrieval (no batch endpoint documented)","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.523Z"},"updatedAt":"2026-04-29T04:33:44.580Z"}}