{"id":"d0176819-7dad-4608-bd40-aee986c4b7e6","shortId":"7eQtbY","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 (resource ID 22) via the x402 payment protocol. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe parent site lowpaymentfee.com hosts a broad collection of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services, all priced at $0.02 per request. However, the specific /api/v1/mortgages/22 endpoint is not listed on the site's landing page among the advertised APIs, and no documentation describes its request body schema or response format. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of any mortgage-specific documentation or examples means the actual data returned is unknown.\n\nBecause the crawled docs pages, pricing page, and README all rendered only a \"Connect wallet\" prompt with no substantive content, there is very little information available about what this mortgage endpoint actually returns or what input it expects beyond a POST request with JSON content type.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC pay-per-call","Base network API"],"warnings":["The /api/v1/mortgages/22 endpoint is not listed among the site's advertised APIs — its purpose and data content are undocumented.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no usable content.","No request body schema or response schema is available; callers must discover behavior experimentally.","The endpoint's description is the generic 'Premium API Access' with no mortgage-specific detail."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/22","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific /mortgages/22 path is not even listed among the site's advertised APIs. Effectively a stub with confirmed 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'0.02':71,130 '000':75 '0x8335':64 '20':74 '22':40 '2913':65 '402':170 '6':79 'Base network API' 'USDC pay-per-call' 'accept':48 'access':32 'actual':185,221 'advertis':149 'ai/ml':120 'among':147 'analyt':119 'api':82,116,150 'attach':91 'avail':215 'base':5,18,59,76 'base-network' 'beyond':228 'bodi':157 'broad':109 'call':115 'caller':89 'challeng':171 'collect':110 'confirm':165 'connect':203 'content':209,234 'contract':63 'cost':69 'crawl':192 'crypto':123 'data':2,15,37,118,186 'decim':80 'describ':154 'doc':193 'document':153,180 'endpoint':3,16,28,47,137,163,220 'exampl':182 'expect':227 'financ':122 'format':161 'header':96 'home loan API' 'host':107 'howev':133 'id':39 'infer':121 'inform':214 'input':225 'json':53,233 'json-response' 'key':83 'lack':174 'land':145 'limit':86 'list':140 'littl':213 'live':166 'lowpaymentfee' 'lowpaymentfee.com':30,106 'maximum':68 'mean':183 'mortgag':1,14,35,178,219 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'mortgage-specif':177 'network':60 'no-api-key' 'page':146,194,196 'parent':104 'pay':7,20,113 'pay-per-cal':112 'pay-per-request':6,19 'payment':44,54,95,101 'per':8,21,72,114,131 'post':49,230 'price':128,195 'prompt':205 'proof':102 'proper':169 'protocol':45 'provid':31 'rate':85 'readm':198 'relat':36 'render':200 'request':9,22,50,73,132,156,231 'requir':88 'resourc':38 'respons':160 'return':52,167,187,222 'schema':158 'servic':126 'settl':56 'simpli':90 'site':105,143 'span':117 'specif':135,179 'substant':208 'type':235 'unit':77 'unknown':189 'usdc':13,26,62 'usdc-settlement' 'use':61 'util':125 'valid':99 'via':10,23,41 'wallet':204 'x':94 'x-payment':93 'x402':11,24,43,100 'x402 mortgage' 'x402-payment'","prices":[{"id":"64e2e79e-a168-4535-bda0-e5ed9fdd84df","listingId":"d0176819-7dad-4608-bd40-aee986c4b7e6","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:12.977Z"}],"sources":[{"listingId":"d0176819-7dad-4608-bd40-aee986c4b7e6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:12.977Z","lastSeenAt":"2026-04-29T05:34:22.045Z"}],"details":{"listingId":"d0176819-7dad-4608-bd40-aee986c4b7e6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/22 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/mortgages/22"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/22"},{"claim":"Site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/mortgages/22 path is not listed among the site's available APIs","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving mortgage-related data for a specific resource (ID 22)","Integrating pay-per-call mortgage information into financial applications","Agent-driven lookups of mortgage details without managing API keys"],"bestFor":["Developers needing on-demand mortgage data with crypto micropayments","AI agents that can settle x402 payments on Base","Applications that want keyless, pay-as-you-go API access"],"notFor":["Users who need comprehensive mortgage comparison or search across many listings","Anyone without a Base-network USDC wallet or x402-compatible client","Production use cases requiring documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.454Z"},"updatedAt":"2026-04-29T05:34:22.045Z"}}