{"id":"cd90e8eb-38a8-47be-8a0e-e46374b542b0","shortId":"tnQeWT","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/57` 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 57), 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 emphasizes a no-API-key, no-rate-limit, instant-access model where 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 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 description of request/response schemas for this mortgage endpoint, and no indication of what data fields are returned. The mortgage endpoint is notably absent from the homepage's listed API catalog, 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","lowpaymentfee","x402 mortgage","USDC pay-per-call","Base network API"],"warnings":["No documentation available for this specific mortgage endpoint — docs, pricing, and README pages are empty.","This endpoint (/api/v1/mortgages/57) is not listed in the provider's homepage API catalog, raising questions about its status.","No request or response schema is available; input parameters and output fields are unknown.","Data provenance and accuracy of mortgage information are completely undocumented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/57","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/57","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 the mortgage endpoint is not listed on the provider's own homepage catalog. The docs/pricing/README pages are all empty beyond a wallet connect prompt. Effectively a stub 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'0.02':93,119 '000':110 '20':109 '402':157 '57':71 '6':115 'Base network API' 'USDC pay-per-call' 'absent':214 'access':134 'across':98 'advertis':90 'api':47,126,170,220 'appear':62 'avail':85 'base':5,18,55,111 'base-network' 'broad':40 'call':46,160 'catalog':41,221 'challeng':104,158 'confirm':105 'connect':179 'content':185 'crawl':86 'data':2,15,68,205 'decim':116 'descript':192 'doc':169 'document':82,164 'emphas':122 'endpoint':3,16,28,61,100,150,199,211,231 'entir':140 'equal':118 'exact':74 'extrem':166 'field':206 'handl':139 'header':145 'home loan API' 'homepag':217 'howev':163 'id':70 'indic':202 'input':78 'instant':133 'instant-access':132 'key':127 'limit':131 'list':219 'live':152 'lowpaymentfee' 'lowpaymentfee.com':35 'materi':87 'maxamountrequir':107 'model':97,135 'mortgag':1,14,66,198,210 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':65 'network':56 'no-api-key':124 'no-rate-limit':128 'notabl':213 'offer':38 'openapi':189 'page':174 'paramet':79 'part':32 'pay':7,20,44 'pay-per-cal':43 'pay-per-request':6,19 'payment':137,144,162 'per':8,21,45,94 'platform':36,89,121 'price':96,171 'product':230 'prompt':181 'protocol':52 'question':224 'rais':223 'rate':130 'readm':173 'relat':67 'render':176 'request':9,22,95,148 'request/response':194 'resourc':69,235 'respons':75 'return':154,208 'schema':76,195 'serv':64 'settl':48 'spars':167 'spec':190 'specif':60 'substant':184 'test/demo':234 'though':72 'uniform':92 'unit':112 'usdc':13,26,58,114 'usdc-settlement' 'use':57 'valid':156 'via':10,23,49 'wallet':180 'whether':226 'without':161 'x402':11,24,51,103,143 'x402 mortgage' 'x402-payment'","prices":[{"id":"4778a1af-f427-45c9-899c-3be559be50b0","listingId":"cd90e8eb-38a8-47be-8a0e-e46374b542b0","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:27.579Z"}],"sources":[{"listingId":"cd90e8eb-38a8-47be-8a0e-e46374b542b0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:27.579Z","lastSeenAt":"2026-04-29T04:33:44.448Z"}],"details":{"listingId":"cd90e8eb-38a8-47be-8a0e-e46374b542b0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/57 \\\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 x402 challenge shows maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/57"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"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 applications needing on-demand mortgage data with crypto-native payment","Developers exploring x402 pay-per-call patterns on Base","Use cases where avoiding API key provisioning is valuable"],"notFor":["Production mortgage underwriting or compliance workflows (no documented schema or data provenance)","Users who need detailed documentation or guaranteed SLAs","Non-crypto payment flows (only USDC on Base is accepted)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.67Z"},"updatedAt":"2026-04-29T04:33:44.448Z"}}