{"id":"c86f4b44-0aaa-438d-9dae-383b81101583","shortId":"sPhP6Y","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/71`. 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/71` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the mortgages endpoint actually returns. The endpoint path suggests it retrieves or processes data related to a specific mortgage record (ID 71), but the exact input parameters and output fields are unknown. The platform appears to be a demonstration or early-stage x402 payment gateway rather than a mature, well-documented API provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","json-response","post-method"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","lowpaymentfee","x402 mortgage","USDC API","Base network API","pay-per-call mortgage","real estate data API"],"warnings":["No API documentation available — docs, pricing, and API pages all render only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific purpose and data returned by /api/v1/mortgages/71 is unknown","The platform appears to be early-stage or a demonstration; reliability is unverified","The mortgages endpoint is not listed on the provider's own landing page among available APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/71","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/71","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/request in USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the mortgages endpoint actually returns. This is effectively a stub 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'/request':129 '0.02':113,128 '000':102 '0x8335':107 '20':101 '2913':108 '6':118 '71':202 'Base network API' 'USDC API' 'accept':87 'access':32 'across':132 'actual':184 'advertis':96 'ai/ml':63 'analyt':62 'api':59,137,155,234 'appear':215 'base':5,18,79,103,110 'broader':47 'call':9,22 'challeng':95 'commit':145 'confirm':125 'connect':161 'content':167 'cost':99 'crypto':66 'data':2,15,37,61,194 'decim':119 'demonstr':219 'descript':178 'doc':152 'document':147,233 'earli':222 'early-stag':221 'endpoint':3,16,28,85,134,183,187 'equal':112 'exact':205 'exampl':175 'extrem':149 'field':210 'financ':65 'flat':127 'gate':71 'gateway':226 'id':201 'infer':64 'input':206 'json':92 'json-response' 'key':138 'land':123 'limit':141 'lowpaymentfee' 'lowpaymentfee.com':30,49 'matur':230 'maximum':98 'minimum':144 'model':131 'mortgag':1,14,35,182,199 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':80 'offer':51 'openapi':171 'output':209 'page':124,156 'paramet':207 'part':44 'path':40,188 'pay':7,20,56 'pay-per-cal':6,19 'pay-per-call mortgage' 'pay-per-request':55 'payment':75,225 'per':8,21,57,114 'platform':48,121,214 'post':88 'post-method' 'price':130,153 'process':193 'prompt':163 'protocol':76 'provid':31,235 'rate':140 'rather':227 'real estate data API' 'record':200 'relat':36,195 'render':158 'request':58,89,115 'request/response':174 'requir':146 'retriev':191 'return':91,185 'schema':172 'servic':69 'span':60 'spars':150 'specif':84,198 'stage':223 'suggest':189 'unit':104 'unknown':212 'usdc':13,26,82,106,116 'usdc-base' 'use':81,117 'util':68 'varieti':53 'via':10,23,72 'wallet':162 'well':232 'well-docu':231 'x402':11,24,74,94,224 'x402 mortgage' 'x402-payment'","prices":[{"id":"e24de54d-a961-40c2-b30e-a4a8ac1a6b16","listingId":"c86f4b44-0aaa-438d-9dae-383b81101583","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:20.343Z"}],"sources":[{"listingId":"c86f4b44-0aaa-438d-9dae-383b81101583","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:20.343Z","lastSeenAt":"2026-04-29T05:34:22.356Z"}],"details":{"listingId":"c86f4b44-0aaa-438d-9dae-383b81101583","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/71 \\\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 platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/mortgages/71"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage record data via a single pay-per-call request","Integrating mortgage information into agent workflows without API key management","Programmatic access to mortgage details settled on Base L2 with USDC"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents needing keyless, on-demand mortgage data access","Projects already operating on the Base network with USDC"],"notFor":["Production use cases requiring documented request/response schemas","Bulk mortgage data retrieval or batch processing","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.052Z"},"updatedAt":"2026-04-29T05:34:22.356Z"}}