{"id":"5e7a1bd6-90cf-4925-8ba7-8829c998abb8","shortId":"87Vs24","kind":"x402","title":"Loan amortization schedule API, pay-per-request via x402 on Base (USDC).","tagline":"Loan amortization schedule API, pay-per-request via x402 on Base (USDC).","description":"This endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 43 in the URL path). It is part of a broader platform offering various pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint is live and returns a standard x402 402 challenge when called without payment. The price is $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is made via the x402 \"exact\" scheme to the specified wallet address on Base. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no description of request parameters, and no example responses. The specific endpoint path suggests it returns a payment schedule for a pre-existing loan resource (ID 43), but it is unclear whether callers can specify different loan IDs, pass loan parameters in the POST body, or if this is a fixed demo resource. The platform's landing page lists many endpoint categories but this particular loans/schedule endpoint is not among them, raising questions about its discoverability and documentation status.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-micropayment","base-network","pay-per-request","json-response"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","payment amortization","loan repayment plan","mortgage schedule API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","This specific endpoint (/api/v1/loans/43/schedule) is not listed among the provider's advertised APIs on the landing page","Request body schema and response format are completely unknown","It is unclear whether loan ID 43 is a fixed resource or if other IDs are supported","No OpenAPI or schema definition provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/43/schedule","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/loans/43/schedule","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/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the specific loans/schedule endpoint is not listed on the provider's own landing page. The purpose and parameters of this endpoint are largely inferred from the URL path 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'000':105 '20':104 '402':92 '43':42,205 '6':111 'accept':130 'access':144 'address':125 'advertis':143 'ai/ml':64 'among':248 'amort':2,15,34 'amortization calculator' 'analyt':63 'api':4,17,60,137,157 'application/json':135 'base':12,25,79,106,127 'base-network' 'bodi':223 'broader':52 'call':59,95 'caller':211 'categori':240 'challeng':93 'connect':166 'content':172 'crawl':155 'crypto':67 'data':62 'decim':112 'demo':230 'descript':179 'differ':214 'discover':254 'doc':156 'document':150,256 'endpoint':28,84,129,189,239,245 'exact':119 'exampl':185 'exist':201 'extrem':152 'financ':66 'fix':229 'gate':146 'id':41,204,216 'infer':65 'json-response' 'key':138 'land':235 'limit':141 'list':237 'live':86 'loan':1,14,33,39,40,202,215,218 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'loans/schedule':244 'lowpaymentfee.com':30 'made':115 'mani':238 'micropay':149 'mortgage schedule API' 'network':80 'offer':54 'openapi':176 'page':161,236 'paramet':182,219 'part':49 'particular':243 'pass':217 'path':46,190 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment':97,113,195 'payment amortization' 'per':7,20,58,102 'platform':53,233 'post':131,222 'pre':200 'pre-exist':199 'price':99,158 'prompt':168 'protocol':76 'pure':147 'question':251 'rais':250 'rate':140 'readm':160 'render':163 'request':8,21,103,132,181 'resourc':203,231 'respons':186 'return':31,88,134,193 'schedul':3,16,35,196 'schema':177 'scheme':120 'servic':70 'settl':72 'span':61 'spars':153 'specif':38,188 'specifi':123,213 'standard':90 'status':257 'substant':171 'suggest':191 'unclear':209 'unit':107 'url':45 'usdc':13,26,82,109 'usdc-micropayment' 'use':81 'util':69 'various':55 'via':9,22,73,116 'wallet':124,167 'whether':210 'without':96 'x402':10,23,75,91,118 'x402-payment'","prices":[{"id":"72bccd88-79dc-40e6-8d47-963b9b1b7307","listingId":"5e7a1bd6-90cf-4925-8ba7-8829c998abb8","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/loans/43/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:34.986Z"}],"sources":[{"listingId":"5e7a1bd6-90cf-4925-8ba7-8829c998abb8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/43/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:34.986Z","lastSeenAt":"2026-04-29T10:34:59.906Z"}],"details":{"listingId":"5e7a1bd6-90cf-4925-8ba7-8829c998abb8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/43/schedule \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/43/schedule"},{"claim":"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":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/43/schedule"}],"useCases":["Retrieving a loan amortization schedule showing principal and interest breakdowns per period","Integrating loan payment calculations into financial planning tools","Agent-driven financial analysis requiring on-demand loan schedule data"],"bestFor":["Developers needing a simple pay-per-call loan schedule endpoint without API key management","AI agents that can settle x402 micropayments on Base for financial data","Prototyping financial applications with low-cost per-request pricing"],"notFor":["Production use requiring detailed API documentation and SLAs","Bulk loan portfolio analysis where per-request costs would accumulate significantly","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.255Z"},"updatedAt":"2026-04-29T10:34:59.906Z"}}