{"id":"5f2c61fd-db44-43c7-8bcf-2c05858e408f","shortId":"4A3QKY","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-request via x402 with USDC.","tagline":"Mortgage data endpoint on Base, pay-per-request via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/63`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints 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/63` 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). This is consistent with the site's stated flat pricing of $0.02 per request across all endpoints. Payment is settled on-chain on Base; no API keys, rate limits, or subscriptions are required.\n\nNote that the endpoint path suggests it returns data for a specific mortgage record (ID 63). The platform's landing page does not list a mortgages category explicitly — the documented categories are Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure. No OpenAPI schema, detailed documentation, or example responses are available for this specific endpoint. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no further content, so the actual request/response schema is unknown.","tags":[],"capabilities":["x402-payment","usdc-on-base","pay-per-request","mortgage-data","json-api","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 only show 'Connect wallet'","The /api/v1/mortgages/ path is not listed among the site's advertised API categories","No OpenAPI spec or response schema provided; request/response format is unknown","Cannot verify what data is actually returned for mortgage ID 63"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/63","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example request/response, and the mortgages category isn't even listed on the site's own landing page. The actual data returned is entirely 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'0.02':113,131 '000':102 '0x8335':107 '20':101 '2913':108 '6':118 '63':169 'USDC pay-per-call' 'accept':87 'access':32 'across':134 'actual':231 'advertis':96 'ai':188 'ai/ml':63 'analyt':62,187 'api':58,146,213 'avail':204 'base':5,18,79,103,110,144 'broader':47 'call':57 'categori':180,184 'chain':142 'challeng':95 'connect':222 'consist':122 'content':228 'cost':99 'crypto':66 'data':2,15,37,61,162,186 'decim':119 'detail':198 'doc':210 'document':183,199 'dozen':52 'endpoint':3,16,28,59,85,136,157,208 'equal':112 'exampl':201 'explicit':181 'financ':65,191 'flat':128 'gate':71 'home loan data' 'id':168 'infer':64 'infrastructur':194 'json':92 'json-api' 'key':147 'land':173 'learn':190 'limit':149 'list':177 'lowpaymentfee' 'lowpaymentfee.com':30,49 'machin':189 'maximum':98 'mortgag':1,14,35,166,179 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':80 'no-api-key' 'note':154 'offer':51 'on-chain':140 'openapi':196 'page':174,214 'part':44 'path':40,158 'pay':7,20,55 'pay-per-cal':54 'pay-per-request':6,19 'payment':75,137 'per':8,21,56,114,132 'platform':48,171 'post':88 'price':129,211 'prompt':224 'protocol':76 'provid':31 'rate':148 'real estate finance API' 'record':167 'relat':36 'render':219 'request':9,22,89,115,133 'request/response':232 'requir':153 'respons':202 'return':91,161 'schema':197,233 'servic':69 'settl':139 'site':125,217 'span':60 'specif':84,165,207 'state':127 'subscript':151 'suggest':159 'unit':104 'unknown':235 'usdc':13,26,82,106,116 'usdc-on-base' 'use':81,117 'util':68 'via':10,23,72 'wallet':223 'web3':192 'x402':11,24,74,94 'x402 mortgage' 'x402-payment'","prices":[{"id":"fa95a3bd-d9bc-45ca-b668-3d9ea332c3c2","listingId":"5f2c61fd-db44-43c7-8bcf-2c05858e408f","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:20.981Z"}],"sources":[{"listingId":"5f2c61fd-db44-43c7-8bcf-2c05858e408f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:20.981Z","lastSeenAt":"2026-04-29T05:06:25.764Z"}],"details":{"listingId":"5f2c61fd-db44-43c7-8bcf-2c05858e408f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/63 \\\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 advertises maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/63"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/63"},{"claim":"Site advertises $0.02 per request flat pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Documented API categories are Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving mortgage record data for a specific loan ID","Integrating mortgage information into financial dashboards","Agent-driven lookups of mortgage details without API key management"],"bestFor":["Developers needing on-demand mortgage data without subscriptions","AI agents that can settle x402 payments on Base","Applications requiring pay-per-call access to financial records"],"notFor":["Bulk mortgage data downloads (pay-per-request model may be costly at scale)","Users who cannot transact in USDC on the Base network","Anyone needing detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.007Z"},"updatedAt":"2026-04-29T05:06:25.764Z"}}