{"id":"b8bb4df3-1e23-4004-aea3-5aa40f01eb2b","shortId":"NDsmbz","kind":"x402","title":"Mortgage data API endpoint on Base, paid per-call with USDC via x402.","tagline":"Mortgage data API endpoint on Base, paid per-call with USDC via x402.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data via a POST request to `/api/v1/mortgages/2`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated by the x402 payment protocol on the Base network.\n\nThe specific `/api/v1/mortgages/2` endpoint is listed under \"Premium API Access\" and costs up to $0.02 per request, payable in USDC (USD Coin) on Base. The x402 challenge confirms the endpoint is live, accepting exact-scheme payments to address `0x1A2B...85F3` with a max amount of 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys or rate limits are advertised; access is granted immediately upon payment.\n\nDocumentation is extremely sparse. The crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content. The mortgage endpoint itself is not listed on the homepage's catalog (which focuses on analytics, AI, finance, and utility endpoints), so its exact input/output schema and the nature of the data it returns are unknown. It may return mortgage rate data, amortization calculations, or similar financial information, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","mortgage-data","post-endpoint","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage rates","mortgage calculator","home loan data","x402 mortgage","USDC pay-per-call","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and API pages all render only a wallet-connect prompt","The /api/v1/mortgages/2 endpoint is not listed on the provider's homepage catalog, making its purpose unclear","No input or output schema is provided; request body format is unknown","The trailing '/2' in the path suggests a resource ID but its meaning is undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/2","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the mortgage endpoint isn't even listed on the site's own catalog. Effectively a stub with confirmed 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'0.02':99,141 '000':132 '0x1a2b':124 '20':131 '6':137 '85f3':125 'USDC pay-per-call' 'accept':117 'access':34,94,150 'address':123 'advertis':149 'ai':194 'ai/ml':67 'amort':220 'amount':129 'analyt':66,193 'api':3,17,62,93,143,165 'avail':232 'base':6,20,83,108,133 'broader':51 'calcul':221 'call':10,24,61 'cannot':228 'catalog':189 'challeng':111 'coin':106 'confirm':112,230 'connect':171 'content':177 'cost':96 'crawl':161 'crypto':70 'data':2,16,39,65,209,219 'decim':138 'doc':162 'document':156 'dozen':56 'endpoint':4,18,30,63,88,114,180,198 'equal':140 'exact':119,201 'exact-schem':118 'extrem':158 'financ':69,195 'financi':224 'focus':191 'gate':75 'grant':152 'home loan data' 'homepag':187 'immedi':153 'infer':68 'inform':225 'input/output':202 'key':144 'limit':147 'list':90,184 'live':116 'lowpaymentfee' 'lowpaymentfee.com':32,53 'materi':233 'max':128 'may':215 'mortgag':1,15,37,179,217 'mortgage API' 'mortgage calculator' 'mortgage rates' 'mortgage-data' 'mortgage-rel':36 'natur':206 'network':84 'no-api-key' 'offer':55 'page':166 'paid':7,21 'part':48 'pay':59 'pay-per-cal':58 'payabl':102 'payment':79,121,155 'per':9,23,60,100 'per-cal':8,22 'per-call-pricing' 'platform':52 'post':42 'post-endpoint' 'premium':92 'price':163 'prompt':173 'protocol':80 'provid':33 'rate':146,218 'relat':38 'request':43,101 'return':168,211,216 'schema':203 'scheme':120 'servic':73 'similar':223 'span':64 'spars':159 'specif':86 'unit':134 'unknown':213 'upon':154 'usd':105 'usdc':12,26,104,136 'usdc-base' 'util':72,197 'via':13,27,40 'wallet':172 'x402':14,28,78,110 'x402 mortgage' 'x402-payment'","prices":[{"id":"bc7a8840-6597-4537-b307-c4b3614a881b","listingId":"b8bb4df3-1e23-4004-aea3-5aa40f01eb2b","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:16.098Z"}],"sources":[{"listingId":"b8bb4df3-1e23-4004-aea3-5aa40f01eb2b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:16.098Z","lastSeenAt":"2026-04-29T05:34:22.166Z"}],"details":{"listingId":"b8bb4df3-1e23-4004-aea3-5aa40f01eb2b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/2 \\\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 maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/2"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/2"}],"useCases":["Retrieving mortgage-related financial data on demand","Integrating mortgage information into agent workflows without API key management","Pay-per-call access to financial calculations settled in USDC on Base"],"bestFor":["Agents needing on-demand mortgage data with crypto micropayments","Developers building x402-compatible financial tooling","Applications that want keyless, pay-as-you-go API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Bulk mortgage data retrieval at high volume (no documented batch support)","Non-crypto payment workflows (only USDC on Base is accepted)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.334Z"},"updatedAt":"2026-04-29T05:34:22.166Z"}}