{"id":"207e7ea5-bd33-46a1-bd09-3e89c22f7b27","shortId":"sgU3Mw","kind":"x402","title":"Mortgage data endpoint on Base, paid per-request via x402 with USDC.","tagline":"Mortgage data endpoint on Base, paid per-request via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/28`. 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 settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/mortgages/28` is listed under the title \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request, consistent with the site's uniform $0.02/request pricing). Payment is made on-chain to the specified wallet address, with no API keys or rate limits required. The asset used is USDC on Base (contract 0x8335…2913).\n\nDocumentation on the site is extremely sparse — the docs, pricing, API, and README 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 `/api/v1/mortgages/28` endpoint actually returns beyond its generic title. The `28` in the path suggests it may reference a specific mortgage record or calculation, but this is unconfirmed. Users should expect to experiment with POST payloads to discover the endpoint's behavior.","tags":[],"capabilities":["x402-payment","usdc-on-base","per-request-billing","mortgage-data","post-endpoint","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data endpoint","lowpaymentfee","x402 mortgage","USDC pay-per-call","Base network API","mortgage calculation","real estate API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or output schema describing request parameters or response format","The purpose of '/api/v1/mortgages/28' is unknown — the '28' path segment is unexplained","This endpoint is not listed on the provider's homepage among their advertised APIs, raising questions about its status"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/28","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/28","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 request/response schema, no examples, and no description of what the mortgage endpoint actually returns. This is effectively a stub 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'/request':123 '0.02':112,122 '000':107 '0x8335':152 '20':106 '28':202 '2913':153 'Base network API' 'USDC pay-per-call' 'accept':95 'access':32,93 'actual':195 'address':135 'ai/ml':63 'analyt':62 'api':58,92,138,164 'asset':145 'base':5,18,78,108,150 'behavior':233 'beyond':197 'broader':47 'calcul':215 'call':57 'chain':130 'challeng':100 'connect':172 'consist':116 'content':178 'contract':151 'cost':104 'crypto':66 'data':2,15,37,61 'descript':189 'discov':229 'doc':162 'document':154 'dozen':52 'endpoint':3,16,28,59,84,194,231 'exampl':186 'expect':222 'experi':224 'extrem':159 'financ':65 'generic':199 'indic':101 'infer':64 'key':139 'limit':142 'list':87 'lowpaymentfee' 'lowpaymentfee.com':30,49 'made':127 'maximum':103 'may':208 'mortgag':1,14,35,212 'mortgage API' 'mortgage calculation' 'mortgage data endpoint' 'mortgage-data' 'mortgage-rel':34 'network':79 'no-api-key' 'offer':51 'on-chain':128 'openapi':182 'page':167 'paid':6,19 'part':44 'path':40,205 'pay':55 'pay-per-cal':54 'payload':227 'payment':125 'per':8,21,56,114 'per-request':7,20 'per-request-billing' 'platform':48 'post':96,226 'post-endpoint' 'premium':91 'price':124,163 'prompt':174 'protocol':75 'provid':31 'rate':141 'readm':166 'real estate API' 'record':213 'refer':209 'relat':36 'render':169 'request':9,22,97,115 'request/response':185 'requir':143 'return':196 'schema':183 'servic':69 'settl':71 'site':119,157 'span':60 'spars':160 'specif':83,211 'specifi':133 'suggest':206 'titl':90,200 'unconfirm':219 'uniform':121 'unit':109 'usd':113 'usdc':13,26,81,111,148 'usdc-on-base' 'use':80,146 'user':220 'util':68 'via':10,23,72 'wallet':134,173 'x402':11,24,74,99 'x402 mortgage' 'x402-payment'","prices":[{"id":"2afa3c2f-6e23-42b7-bc09-ba6d21eb6c6f","listingId":"207e7ea5-bd33-46a1-bd09-3e89c22f7b27","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:12.978Z"}],"sources":[{"listingId":"207e7ea5-bd33-46a1-bd09-3e89c22f7b27","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:12.978Z","lastSeenAt":"2026-04-29T05:34:22.088Z"}],"details":{"listingId":"207e7ea5-bd33-46a1-bd09-3e89c22f7b27","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/28 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/28"},{"claim":"The platform advertises uniform $0.02/request pricing 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/28"}],"useCases":["Retrieving mortgage-related data or calculations via a single paid API call","Integrating mortgage information into agent workflows that can settle payments on Base","Programmatic access to mortgage records without traditional API key management"],"bestFor":["Agents or applications that can settle x402 payments in USDC on Base","Developers needing on-demand mortgage data without subscription commitments","Automated pipelines requiring pay-per-use financial data endpoints"],"notFor":["Users who need detailed documentation or well-defined schemas before integrating","Applications requiring free or subscription-based mortgage data access","High-volume consumers who would benefit from bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.354Z"},"updatedAt":"2026-04-29T05:34:22.088Z"}}