{"id":"5617d97f-5117-42f3-93e5-342728ddd956","shortId":"JJnRtu","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 `/api/v1/mortgages/13` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint appears to serve mortgage-related data (resource ID 13), though the exact response schema and input parameters are not documented in the available crawl material. The platform advertises a uniform $0.02 per request pricing model across its endpoints, and the x402 challenge confirms a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02.\n\nThe platform markets itself as requiring no API keys, no rate limits, and offering instant access. Payment is handled entirely through the x402 payment header on each request. The endpoint is live and returns a valid 402 challenge when called without payment. However, documentation is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no description of what mortgage data is returned or what POST body is expected. The mortgages endpoint is not listed on the homepage's catalog of available APIs, which raises questions about whether it is a production endpoint or a test/demo resource.","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","x402 mortgage","pay-per-call mortgage","lowpaymentfee","USDC API","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/13 endpoint is not listed in the provider's homepage API catalog, raising questions about its status.","No request body schema or response schema is documented anywhere; callers must guess at the expected input and output.","No OpenAPI or machine-readable spec is available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/13","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/13","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, confirming pricing and settlement details. However, there is no documentation, no OpenAPI spec, no request/response schema, and the mortgages endpoint is not even listed in the provider's own homepage catalog. This is effectively a stub 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'0.02':93,119 '000':110 '13':71 '20':109 '402':156 '6':115 'Base network API' 'USDC API' 'access':135 'across':98 'advertis':90 'api':47,127,169,221 'appear':62 'avail':85,220 'base':5,18,55,111 'base-network' 'bodi':205 'broad':40 'call':9,22,159 'catalog':41,218 'challeng':104,157 'confirm':105 'connect':178 'content':184 'crawl':86 'data':2,15,68,199 'decim':116 'descript':195 'doc':168 'document':82,163 'endpoint':3,16,28,61,100,149,210,231 'entir':139 'equal':118 'exact':74 'expect':207 'extrem':165 'handl':138 'header':144 'home loan API' 'homepag':216 'howev':162 'id':70 'input':78 'instant':134 'key':128 'limit':131 'list':213 'live':151 'lowpaymentfee' 'lowpaymentfee.com':35 'market':122 'materi':87 'maxamountrequir':107 'model':97 'mortgag':1,14,66,198,209 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':65 'network':56 'no-api-key' 'offer':38,133 'openapi':188 'page':173 'paramet':79 'part':32 'pay':7,20,44 'pay-per-cal':6,19 'pay-per-call mortgage' 'pay-per-request':43 'payment':136,143,161 'per':8,21,45,94 'platform':36,89,121 'post':204 'price':96,170 'product':230 'prompt':180 'protocol':52 'question':224 'rais':223 'rate':130 'readm':172 'relat':67 'render':175 'request':46,95,147 'request/response':191 'requir':125 'resourc':69,235 'respons':75 'return':153,201 'schema':76,192 'serv':64 'settl':48 'spec':189 'specif':60 'substant':183 'test/demo':234 'thin':166 'though':72 'uniform':92 'unit':112 'usdc':13,26,58,114 'usdc-settlement' 'use':57 'valid':155 'via':10,23,49 'wallet':179 'whether':226 'without':160 'x402':11,24,51,103,142 'x402 mortgage' 'x402-payment'","prices":[{"id":"28a415ca-c1f6-4a4e-8894-a44019bd3a6e","listingId":"5617d97f-5117-42f3-93e5-342728ddd956","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:10.568Z"}],"sources":[{"listingId":"5617d97f-5117-42f3-93e5-342728ddd956","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:10.568Z","lastSeenAt":"2026-04-29T05:34:21.962Z"}],"details":{"listingId":"5617d97f-5117-42f3-93e5-342728ddd956","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/13 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/13"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/13"},{"claim":"The mortgages endpoint is not listed among the available APIs on the homepage","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving mortgage-related data on a per-request payment basis","Integrating mortgage information into agent workflows without API key management","Programmatic access to mortgage records settled via crypto micropayments"],"bestFor":["Agents or apps needing on-demand mortgage data without subscription commitments","Developers experimenting with x402 pay-per-call patterns","Use cases where avoiding API key provisioning is valuable"],"notFor":["Production mortgage applications requiring documented, stable schemas and SLAs","Users who need detailed documentation or OpenAPI specs before integration","High-volume mortgage data consumers who would benefit from bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.564Z"},"updatedAt":"2026-04-29T05:34:21.962Z"}}