{"id":"87900729-e0e0-4141-b5b2-1e16e29380ba","shortId":"WBFxaV","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 85 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 gated behind the x402 payment protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Each call costs $0.02 in USDC (20,000 base units with 6 decimals) settled on-chain to a specified payTo address. The x402 challenge confirms the endpoint is live and uses the \"exact\" payment scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through per-request micropayments.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no explanation of what input parameters the POST body expects or what fields the amortization schedule response contains. The endpoint path suggests it is tied to a specific loan ID (85), but it is unclear whether this is a demo resource or whether other loan IDs are available. Users should expect to experiment with the endpoint to discover its input/output contract.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-micropayment","base-network","pay-per-request","json-api"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","mortgage schedule","loan repayment plan","payment breakdown","loan calculator API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty","No OpenAPI spec or request/response schema provided","Endpoint path is hardcoded to loan ID 85; unclear if other loan IDs are supported or how to parameterize","The broader platform advertises many API categories but this specific endpoint's functionality is undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/85/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/85/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on request parameters or response schema. The /docs and other pages are empty beyond a wallet connect prompt. The endpoint path is hardcoded to loan ID 85 with no explanation of how to use other resources. Effectively a stub 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'/docs':156 '/pricing':158 '/readme':160 '0.02':95 '000':99 '20':98 '300':130 '6':103 '85':42,213 'accept':86 'access':141 'address':113 'advertis':140 'ai/ml':64 'amort':2,15,34,197 'amortization calculator' 'analyt':63 'api':4,17,60,134 'avail':230 'base':12,25,80,100 'base-network' 'behind':73 'bodi':191 'broader':52 'call':59,93 'chain':108 'challeng':116 'confirm':117 'connect':166 'contain':200 'content':172 'contract':243 'cost':94 'crawl':155 'crypto':67 'data':62 'decim':104 'demo':222 'discov':240 'document':150,181 'endpoint':28,85,119,202,238 'exact':125 'expect':192,233 'experi':235 'explan':184 'extrem':152 'field':195 'financ':66 'gate':72 'grant':143 'id':41,212,228 'infer':65 'input':187 'input/output':242 'json':91 'json-api' 'key':135 'limit':138 'live':121 'loan':1,14,33,39,40,211,227 'loan calculator API' 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':30 'micropay':149 'mortgage schedule' 'network':81 'offer':54 'on-chain':106 'openapi':176 'page':161 'paramet':188 'part':49 'path':46,203 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment':76,126 'payment breakdown' 'payto':112 'per':7,20,58,147 'per-request':146 'platform':53 'post':87,190 'prompt':168 'protocol':77 'pure':144 'rate':137 'request':8,21,88,148 'request/response':179 'resourc':223 'respons':199 'return':31,90,163 'schedul':3,16,35,198 'schema':180 'scheme':127 'second':131 'servic':70 'settl':105 'span':61 'spars':153 'spec':177 'specif':38,210 'specifi':111 'substant':171 'suggest':204 'tie':207 'timeout':132 'unclear':217 'unit':101 'url':45 'usdc':13,26,83,97 'usdc-micropayment' 'use':82,123 'user':231 'util':69 'various':55 'via':9,22 'wallet':167 'whether':218,225 'x402':10,23,75,115 'x402-payment'","prices":[{"id":"d93d6b3e-7752-4d5f-afae-b93805b2bdde","listingId":"87900729-e0e0-4141-b5b2-1e16e29380ba","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/85/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":"2026-04-18T18:47:56.632Z"}],"sources":[{"listingId":"87900729-e0e0-4141-b5b2-1e16e29380ba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/85/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:56.632Z","lastSeenAt":"2026-04-29T07:05:32.623Z"}],"details":{"listingId":"87900729-e0e0-4141-b5b2-1e16e29380ba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/85/schedule \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising $0.02 USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/85/schedule"},{"claim":"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/loans/85/schedule"}],"useCases":["Retrieving an amortization schedule for a loan showing principal and interest breakdowns per period","Integrating loan payment calculations into financial planning tools","Agents autonomously fetching loan schedules without API key provisioning"],"bestFor":["Developers needing on-demand loan amortization data via micropayment","AI agents that can settle x402 payments on Base for financial data","Projects wanting keyless, pay-per-use access to financial calculations"],"notFor":["Users who need detailed API documentation before integrating","Bulk or high-volume loan schedule generation where per-call fees add up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.172Z"},"updatedAt":"2026-04-29T07:05:32.623Z"}}