{"id":"8a3ac649-aee7-4469-9fda-4f9c514c3788","shortId":"eAvwpf","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 via a pay-per-request x402 protocol. The specific resource `/api/v1/mortgages/19` appears to serve mortgage information (likely a specific mortgage record or calculation) and accepts POST requests. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request.\n\nThe broader lowpaymentfee.com platform hosts a variety of x402-gated API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced uniformly at $0.02 per call. The platform advertises no API keys, no rate limits, and instant access; authentication and billing are handled entirely through the x402 payment header mechanism.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/mortgages/19` endpoint actually returns. The mortgage endpoint is not listed on the homepage's catalog of available APIs, which raises questions about whether it is a production resource or a test/demo endpoint. Users should expect to experiment with the endpoint to discover its actual input and output format.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC pay-per-call","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The /api/v1/mortgages/19 endpoint is not listed in the provider's homepage API catalog, raising questions about its status.","No request or response schema is documented; input/output format is unknown.","No OpenAPI spec or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/19","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no OpenAPI schema, no request/response examples, and the mortgage endpoint is not even listed on the provider's homepage. Effectively a stub with only pricing and protocol details 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'0.02':81,111 'Base network API' 'USDC pay-per-call' 'accept':63 'access':32,125 'actual':176,217 'advertis':116 'ai/ml':100 'analyt':99 'api':95,118,144,191 'appear':50 'authent':126 'avail':190 'base':5,18,71 'base-network' 'bill':128 'broader':85 'calcul':61 'call':9,22,113 'catalog':188 'coin':76 'connect':153 'content':159 'cost':79 'crypto':103 'data':2,15,37,98 'descript':170 'discov':215 'doc':143 'document':138 'endpoint':3,16,28,96,175,180,205,213 'entir':131 'exampl':167 'expect':208 'experi':210 'extrem':140 'financ':102 'format':221 'gate':94 'handl':130 'header':136 'home loan API' 'homepag':186 'host':88 'infer':101 'inform':54 'input':218 'instant':124 'key':119 'like':55 'limit':122 'list':183 'lowpaymentfee' 'lowpaymentfee.com':30,86 'mechan':137 'mortgag':1,14,35,53,58,179 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':72 'no-api-key' 'openapi':163 'output':220 'page':148 'pay':7,20,41 'pay-per-cal':6,19 'pay-per-request':40 'payment':66,135 'per':8,21,42,82,112 'platform':87,115 'post':64 'price':108,145 'product':200 'prompt':155 'protocol':45 'provid':31 'question':194 'rais':193 'rate':121 'readm':147 'record':59 'relat':36 'render':150 'request':43,65,83 'request/response':166 'resourc':48,201 'return':177 'schema':164 'serv':52 'servic':106 'settl':68 'span':97 'spars':141 'specif':47,57 'substant':158 'test/demo':204 'uniform':109 'usd':75 'usdc':13,26,74 'usdc-settlement' 'use':73 'user':206 'util':105 'varieti':90 'via':10,23,38 'wallet':154 'whether':196 'x402':11,24,44,93,134 'x402 mortgage' 'x402-gated':92 'x402-payment'","prices":[{"id":"04044cf1-f23e-4344-8dcd-6871728bc2a0","listingId":"8a3ac649-aee7-4469-9fda-4f9c514c3788","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:15.477Z"}],"sources":[{"listingId":"8a3ac649-aee7-4469-9fda-4f9c514c3788","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:15.477Z","lastSeenAt":"2026-04-29T05:34:22.215Z"}],"details":{"listingId":"8a3ac649-aee7-4469-9fda-4f9c514c3788","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/19 \\\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 x402 challenge with USDC on Base network at maxAmountRequired 20000 (i.e., $0.02)","source_url":"https://lowpaymentfee.com/api/v1/mortgages/19"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/19"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving mortgage record or calculation data on a per-request basis","Integrating mortgage information into agent workflows without API key management","Programmatic access to mortgage data settled via crypto micropayments"],"bestFor":["Developers or agents needing on-demand mortgage data with crypto-native billing","x402-compatible agents that can pay per call on Base with USDC","Prototyping pay-per-use financial data integrations"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Bulk mortgage data retrieval at scale (no documented batch support)","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.238Z"},"updatedAt":"2026-04-29T05:34:22.215Z"}}