{"id":"9a4a5f8b-30c4-4fc9-9226-12adcf78fde5","shortId":"evE9uN","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/67`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request 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/67` 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 advertised flat pricing of $0.02 per request across all endpoints. No API keys are required; payment is handled inline via the X-PAYMENT header.\n\nDocumentation on the site 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 `/api/v1/mortgages/67` endpoint actually returns (e.g., whether \"67\" is a resource ID, a product type, or something else). The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what data to send or expect back.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","json-api","post-method"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC API","Base network API","pay-per-call mortgage"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The meaning of '/mortgages/67' (whether 67 is a resource ID, category, etc.) is unknown","No request or response examples available anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/67","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the mortgages/67 resource represents. This is effectively a stub 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'0.02':113,131 '000':102 '0x8335':107 '20':101 '2913':108 '402':212 '6':118 '67':196 'Base network API' 'USDC API' 'accept':87 'access':32 'across':134 'actual':192 'advertis':96,127 'ai/ml':63 'analyt':62 'api':58,138,163 'back':231 'base':5,18,79,103,110 'broader':47 'call':9,22 'captur':214 'challeng':95,213 'confirm':210 'connect':169 'consist':122 'content':175 'cost':99 'crypto':66 'data':2,15,37,61,226 'decim':119 'descript':186 'difficult':222 'doc':160 'document':152,219 'dozen':52 'e.g':194 'els':206 'endpoint':3,16,28,59,85,136,191,208 'equal':112 'exampl':183 'expect':230 'extrem':157 'financ':65 'flat':128 'gate':71 'handl':144 'header':151 'home loan API' 'id':200 'infer':64 'inlin':145 'json':92 'json-api' 'key':139 'know':224 'lack':217 'live':211 'lowpaymentfee' 'lowpaymentfee.com':30,49 'make':220 'maximum':98 'mortgag':1,14,35 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':80 'offer':51 'openapi':179 'page':164 'part':44 'path':40 'pay':7,20,55 'pay-per-cal':6,19 'pay-per-call mortgage' 'pay-per-request':54 'payment':75,142,150 'per':8,21,56,114,132 'platform':48 'post':88 'post-method' 'price':129,161 'product':202 'prompt':171 'protocol':76 'provid':31 'relat':36 'render':166 'request':57,89,115,133 'request/response':182 'requir':141 'resourc':199 'return':91,193 'schema':180 'send':228 'servic':69 'site':125,155 'someth':205 'span':60 'spars':158 'specif':84 'type':203 'unit':104 'usdc':13,26,82,106,116 'usdc-base' 'use':81,117 'util':68 'via':10,23,72,146 'wallet':170 'whether':195 'x':149 'x-payment':148 'x402':11,24,74,94 'x402 mortgage' 'x402-payment'","prices":[{"id":"991225d7-4162-4f0f-b871-1c797e6b7fe7","listingId":"9a4a5f8b-30c4-4fc9-9226-12adcf78fde5","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:26.976Z"}],"sources":[{"listingId":"9a4a5f8b-30c4-4fc9-9226-12adcf78fde5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:26.976Z","lastSeenAt":"2026-04-29T04:33:44.422Z"}],"details":{"listingId":"9a4a5f8b-30c4-4fc9-9226-12adcf78fde5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/67 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/67"},{"claim":"The platform advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/67"}],"useCases":["Retrieving mortgage-related data programmatically with per-request USDC payment","Integrating mortgage information into agent workflows without API key management","Accessing financial data endpoints via x402 micropayments on Base"],"bestFor":["Developers or agents needing on-demand mortgage data with no subscription","x402-compatible agents that can pay per call in USDC on Base","Prototyping financial data pipelines with instant, keyless API access"],"notFor":["Users who need detailed documentation or well-defined schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.749Z"},"updatedAt":"2026-04-29T04:33:44.422Z"}}