{"id":"7f8afa2f-4e67-48aa-9207-b3cda6b090f7","shortId":"4Lzau3","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 78 in the URL path). It is part of a broader platform offering various pay-per-call APIs across data analytics, AI/ML, finance, and utility categories, all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint is live and returns a 402 Payment Required challenge, indicating it accepts x402 payments with a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the loan schedule contains or what input parameters the POST body expects. The loan-specific path (/loans/78/schedule) suggests this may be a fixed demo resource or that the loan ID is parameterized. Without documentation, the exact request format and response structure are unknown.","tags":[],"capabilities":["loan-schedule","amortization","x402-payment","usdc-base","pay-per-request","json-api"],"categories":["finance"],"synonyms":["loan amortization","payment schedule","loan calculator","amortization table","loan repayment schedule","mortgage schedule"],"warnings":["No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt","No OpenAPI or request/response schema provided; input parameters for the POST body are unknown","The endpoint path includes a hardcoded loan ID (78); it is unclear whether this is parameterized or a fixed demo resource","No information on what fields the amortization schedule response contains"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/78/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/78/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the loan-specific path is unexplained. This is effectively a stub 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'0.02':108 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':122 '20':102 '402':88 '6':115 '78':42 'accept':94,127 'across':61 'address':121 'ai/ml':64 'amort':2,15,34 'amortization' 'amortization table' 'analyt':63 'api':4,17,60,140 'application/json':132 'base':12,25,77,104,124 'bodi':180 'broader':52 'call':59 'categori':68 'challeng':91 'connect':149 'contain':173 'content':155 'cost':100 'crawl':138 'data':62 'decim':116 'demo':194 'descript':166 'doc':139 'document':133,204 'endpoint':28,82,126 'exact':206 'exampl':163 'expect':181 'extrem':135 'field':169 'financ':65 'fix':193 'format':208 'id':41,200 'indic':92 'input':176 'json-api' 'live':84 'loan':1,14,33,39,40,171,184,199 'loan amortization' 'loan calculator' 'loan repayment schedule' 'loan-schedule' 'loan-specif':183 'lowpaymentfee.com':30 'made':119 'maximum':99 'may':190 'mortgage schedule' 'network':78 'offer':54 'openapi':159 'page':144 'paramet':177 'parameter':202 'part':49 'path':46,186 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment':89,96,117 'payment schedule' 'per':7,20,58,110 'platform':53 'post':128,179 'price':141 'prompt':151 'protocol':74 'readm':143 'render':146 'request':8,21,111,129,207 'request/response':162 'requir':90 'resourc':195 'respons':210 'return':31,86,131 'schedul':3,16,35,172 'schema':160 'settl':70 'sinc':112 'spars':136 'specif':38,185 'structur':211 'suggest':188 'unit':105 'unknown':213 'url':45 'usd':109 'usdc':13,26,80,107,113 'usdc-base' 'use':79,114 'util':67 'various':55 'via':9,22,71 'wallet':150 'without':203 'x402':10,23,73,95 'x402-payment'","prices":[{"id":"7b92e3fd-3d1e-443c-959e-7e8c6990471f","listingId":"7f8afa2f-4e67-48aa-9207-b3cda6b090f7","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/78/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":"2026-04-18T18:47:56.037Z"}],"sources":[{"listingId":"7f8afa2f-4e67-48aa-9207-b3cda6b090f7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/78/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:56.037Z","lastSeenAt":"2026-04-29T07:05:32.588Z"}],"details":{"listingId":"7f8afa2f-4e67-48aa-9207-b3cda6b090f7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/78/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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/78/schedule"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and 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/loans/78/schedule"}],"useCases":["Retrieve an amortization schedule for a loan showing principal and interest breakdowns per period","Integrate loan payment schedule data into financial planning tools","Programmatic access to loan repayment details without API key management"],"bestFor":["Agents needing on-demand loan schedule data with no signup","Developers building financial tools who want pay-per-call pricing","Crypto-native applications that can settle payments on Base"],"notFor":["Users needing detailed API documentation or guaranteed schema stability","Applications requiring bulk loan data retrieval at scale (no documented batch endpoint)","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.176Z"},"updatedAt":"2026-04-29T07:05:32.588Z"}}