{"id":"cee31d21-836e-408c-a778-2efc15661ef6","shortId":"T55gGT","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 `/api/v1/mortgages/16` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-call APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint appears to serve mortgage-related data (resource ID 16), 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 (0.02 USDC, i.e., $0.02) on Base.\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 using USDC on the Base L2 network. The endpoint is live and returns a proper 402 challenge when called without payment. However, documentation 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 spec, no request/response schema, and no description of what mortgage data is returned or what parameters the POST body accepts. The endpoint's purpose must be inferred entirely from its URL path.","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 data","x402 mortgage","USDC pay-per-call","lowpaymentfee","Base network API","402 payment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No description of request parameters or response format — purpose inferred from URL only","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific mortgage endpoint (/api/v1/mortgages/16) is not listed on the provider's homepage catalog, raising questions about its status"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/16","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no description of what data is actually returned. The mortgage-specific purpose is inferred solely from the URL path. Docs pages are empty beyond a wallet connect 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'0.02':93,115,118 '000':110 '16':71 '20':109 '402':161 '402 payment API' 'Base network API' 'USDC pay-per-call' 'accept':213 'access':136 'across':98 'advertis':90 'api':47,128,174 'appear':62 'avail':85 'base':5,18,55,111,120,150 'base-network' 'bodi':212 'broad':40 'call':46,164 'catalog':41 'challeng':104,162 'confirm':105 'connect':183 'content':189 'crawl':86 'data':2,15,68,204 'descript':200 'doc':173 'document':82,168 'endpoint':3,16,28,61,100,154,215 'entir':140,221 'exact':74 'extrem':170 'handl':139 'header':145 'home loan data' 'howev':167 'i.e':117 'id':70 'infer':220 'input':78 'instant':135 'key':129 'l2':151 'limit':132 'live':156 'lowpaymentfee' 'lowpaymentfee.com':35 'market':123 'materi':87 'maxamountrequir':107 'model':97 'mortgag':1,14,66,203 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':65 'must':218 'network':56,152 'no-api-key' 'offer':38,134 'openapi':193 'page':178 'paramet':79,209 'part':32 'path':225 'pay':7,20,44 'pay-per-cal':43 'pay-per-request':6,19 'payment':137,144,166 'per':8,21,45,94 'platform':36,89,122 'post':211 'price':96,175 'prompt':185 'proper':160 'protocol':52 'purpos':217 'rate':131 'readm':177 'relat':67 'render':180 'request':9,22,95 'request/response':196 'requir':126 'resourc':69 'respons':75 'return':158,206 'schema':76,197 'serv':64 'settl':48 'spars':171 'spec':194 'specif':60 'substant':188 'though':72 'uniform':92 'unit':112 'url':224 'usdc':13,26,58,114,116,147 'usdc-settlement' 'use':57,146 'via':10,23,49 'wallet':184 'without':165 'x402':11,24,51,103,143 'x402 mortgage' 'x402-payment'","prices":[{"id":"f7389945-709d-4d19-90e7-9273c7b1c0d1","listingId":"cee31d21-836e-408c-a778-2efc15661ef6","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:08.173Z"}],"sources":[{"listingId":"cee31d21-836e-408c-a778-2efc15661ef6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:08.173Z","lastSeenAt":"2026-04-29T05:34:21.929Z"}],"details":{"listingId":"cee31d21-836e-408c-a778-2efc15661ef6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/16 \\\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/16"},{"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 address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/16"}],"useCases":["Retrieving mortgage-related data for a specific record (ID 16)","Integrating mortgage information into financial dashboards or agent workflows","Programmatic access to mortgage data without API key registration"],"bestFor":["Agents or apps needing on-demand mortgage data with crypto micropayments","Developers who want keyless, pay-per-call API access on Base","Quick prototyping against financial data endpoints without signup"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Bulk mortgage data retrieval (no documented batch endpoints)","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.578Z"},"updatedAt":"2026-04-29T05:34:21.929Z"}}