{"id":"1b73535d-3209-45e6-99b9-1ff0cb572e89","shortId":"UD8MD7","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/39` 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 39), though the exact response schema and input parameters are not documented in the available crawl material. The endpoint is live and returns a valid x402 challenge on POST requests.\n\nThe platform advertises a flat $0.02 per request across its API catalog, and the x402 challenge for this endpoint shows a `maxAmountRequired` of 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the site's stated pricing. Payment is made via the x402 exact scheme to a specified wallet address on Base. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no description of what mortgage data this endpoint actually returns. 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","real estate finance","lowpaymentfee","x402 mortgage","USDC micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No request or response schema provided; input parameters and output format are unknown","The specific meaning of 'mortgages/39' (resource ID? product type?) is undocumented","The platform lists many endpoint categories but this specific mortgage endpoint is not listed on the homepage catalog"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/39","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/39","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no description of what mortgage data is actually returned. The endpoint's purpose is inferred solely from its URL path, making this effectively a stub 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'0.02':106,134 '000':125 '20':124 '39':71 '6':130 'USDC micropayment API' 'access':166 'across':109 'actual':211 'addit':192 'address':155 'advertis':103,165 'api':47,111,159,178 'appear':62 'avail':85 'base':5,18,55,126,157 'base-network' 'broad':40 'call':46 'catalog':41,112 'challeng':97,116 'connect':187 'consist':136 'content':193 'crawl':86 'data':2,15,68,208 'decim':131 'descript':204 'doc':177 'document':82,172 'endpoint':3,16,28,61,89,119,210,214 'entir':220 'equal':133 'exact':74,149 'extrem':174 'flat':105 'gate':168 'home loan data' 'id':70 'infer':219 'input':78 'key':160 'limit':163 'live':91 'lowpaymentfee' 'lowpaymentfee.com':35 'made':145 'materi':87 'maxamountrequir':122 'micropay':171 'mortgag':1,14,66,207 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':65 'must':217 'network':56 'no-api-key' 'offer':38 'openapi':197 'page':182 'paramet':79 'part':32 'path':224 'pay':7,20,44 'pay-per-cal':43 'pay-per-request':6,19 'payment':143 'per':8,21,45,107 'platform':36,102 'post':99 'price':142,179 'prompt':189 'protocol':52 'pure':169 'purpos':216 'rate':162 'readm':181 'real estate finance' 'relat':67 'render':184 'request':9,22,100,108 'request/response':200 'resourc':69 'respons':75 'return':93,212 'schema':76,201 'scheme':150 'serv':64 'settl':48 'show':120 'site':139 'spars':175 'spec':198 'specif':60 'specifi':153 'state':141 'though':72 'unit':127 'url':223 'usd':135 'usdc':13,26,58,129 'usdc-settlement' 'use':57 'valid':95 'via':10,23,49,146 'wallet':154,188 'x402':11,24,51,96,115,148 'x402 mortgage' 'x402-payment'","prices":[{"id":"49b789f9-d848-4c15-9862-6d7b02f49951","listingId":"1b73535d-3209-45e6-99b9-1ff0cb572e89","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:16.695Z"}],"sources":[{"listingId":"1b73535d-3209-45e6-99b9-1ff0cb572e89","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:16.695Z","lastSeenAt":"2026-04-29T05:34:22.238Z"}],"details":{"listingId":"1b73535d-3209-45e6-99b9-1ff0cb572e89","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/39 \\\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/39"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/39"}],"useCases":["Retrieving mortgage-related data for a specific resource (ID 39)","Integrating mortgage information into financial dashboards or agent workflows","Programmatic access to mortgage data without API key registration"],"bestFor":["Agents or developers needing on-demand mortgage data with no signup","x402-compatible clients on the Base network","Micropayment-gated data access without subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Bulk mortgage data retrieval (pay-per-request model may not be cost-effective at scale)","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.228Z"},"updatedAt":"2026-04-29T05:34:22.238Z"}}