{"id":"ea0be3cc-0614-42f1-a213-5394d84ea8cd","shortId":"6zkhU4","kind":"x402","title":"30-year mortgage data endpoint, pay-per-call via x402 on Base (USDC).","tagline":"30-year mortgage data endpoint, pay-per-call via x402 on Base (USDC).","description":"This endpoint at `/api/v1/mortgages/30` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint appears to serve 30-year mortgage-related data (likely rate or payment calculations), though the exact response schema is not documented in the available crawl material.\n\nThe endpoint is live and returns a valid x402 challenge. The price per request is $0.02 USDC (maxAmountRequired of 20,000 base units at 6 decimals). Payment is made via the x402 \"exact\" scheme to the specified wallet address on Base. No API keys or rate limits are advertised — access is gated purely by micropayment. The platform lists many other endpoints across finance, AI, data analytics, and utility categories, all at the same $0.02/request price point.\n\nDocumentation 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 example payloads available. The endpoint's exact input parameters and output format must be discovered experimentally.","tags":[],"capabilities":["mortgage-data","30-year-rates","x402-payment","usdc-micropayment","base-network","pay-per-request","finance-api"],"categories":["finance"],"synonyms":["30 year mortgage rate","mortgage calculator","mortgage API","home loan rates","fixed rate mortgage","mortgage payment","housing finance data"],"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.","Endpoint functionality inferred solely from URL path '/api/v1/mortgages/30'; actual behavior unverified.","This endpoint is not listed on the provider's homepage among their advertised APIs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/30","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/30","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 402 challenge, confirming it exists and is gated by payment. However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The endpoint's actual functionality (what it returns for 30-year mortgages) is entirely inferred from the URL path. Docs pages are empty 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'/request':164 '0.02':105,163 '000':110 '20':109 '30':1,15,66 '30 year mortgage rate' '30-year-rates' '6':114 'access':139 'across':151 'address':128 'advertis':138 'ai':153 'analyt':155 'api':48,132,173 'appear':63 'avail':87,201 'base':13,27,56,111,130 'base-network' 'calcul':76 'call':9,23 'categori':158 'challeng':99 'collect':42 'connect':182 'content':188 'crawl':88 'data':4,18,71,154 'decim':115 'discov':213 'doc':172 'document':84,167 'endpoint':5,19,30,62,91,150,203 'exact':79,122,205 'exampl':199 'experiment':214 'extrem':169 'financ':152 'finance-api' 'fixed rate mortgage' 'format':210 'gate':141 'home loan rates' 'housing finance data' 'input':206 'key':133 'like':72 'limit':136 'list':147 'live':93 'lowpaymentfee.com':37 'made':118 'mani':148 'materi':89 'maxamountrequir':107 'micropay':144 'mortgag':3,17,69 'mortgage API' 'mortgage calculator' 'mortgage payment' 'mortgage-data' 'mortgage-rel':68 'must':211 'network':57 'offer':40 'openapi':192 'output':209 'page':177 'paramet':207 'part':34 'pay':7,21,45 'pay-per-cal':6,20 'pay-per-request':44 'payload':200 'payment':75,116 'per':8,22,46,102 'platform':38,146 'point':166 'price':101,165,174 'prompt':184 'protocol':53 'pure':142 'rate':73,135 'readm':176 'relat':70 'render':179 'request':47,103 'request/response':195 'respons':80 'return':95 'schema':81,196 'scheme':123 'serv':65 'settl':49 'spars':170 'spec':193 'specif':61 'specifi':126 'substant':187 'though':77 'unit':112 'usdc':14,28,59,106 'usdc-micropayment' 'use':58 'util':157 'valid':97 'via':10,24,50,119 'wallet':127,183 'x402':11,25,52,98,121 'x402-payment' 'year':2,16,67","prices":[{"id":"af4f366f-5120-4c2e-8ea9-fed6580a978f","listingId":"ea0be3cc-0614-42f1-a213-5394d84ea8cd","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:13.574Z"}],"sources":[{"listingId":"ea0be3cc-0614-42f1-a213-5394d84ea8cd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:13.574Z","lastSeenAt":"2026-04-29T05:34:22.108Z"}],"details":{"listingId":"ea0be3cc-0614-42f1-a213-5394d84ea8cd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/30 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/30"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/30"}],"useCases":["Fetching current 30-year mortgage rate data for financial applications","Integrating mortgage information into real estate or lending tools","Automated mortgage rate monitoring by AI agents"],"bestFor":["Developers needing on-demand mortgage data without API key management","AI agents that can settle x402 micropayments on Base","Applications requiring simple pay-per-call access to financial data"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would prefer bulk/subscription pricing","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.353Z"},"updatedAt":"2026-04-29T05:34:22.108Z"}}