{"id":"46ff0e2e-0510-44e8-acf6-36ed9df662b4","shortId":"qqSSk2","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 53 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 x402 micropayments on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers attach an X-PAYMENT header containing a signed USDC payment on Base. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The platform advertises a flat $0.02/request price across all endpoints, with no API keys, no rate limits, and instant access.\n\nNote that this specific endpoint (/api/v1/loans/53/schedule) is not listed on the provider's landing page among the advertised API categories, so its exact input schema and response format are unknown. The loan schedule functionality is inferred solely from the URL path. No OpenAPI spec, detailed documentation, or example responses were found in the crawl. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content.","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","loan repayment plan","mortgage schedule API"],"warnings":["This specific endpoint (/api/v1/loans/53/schedule) is not listed among the provider's advertised APIs — its availability and behavior are unverified beyond the 402 challenge.","No API documentation, OpenAPI spec, or example request/response bodies were found.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no content.","The hardcoded loan ID (53) in the path suggests this may be a resource-specific endpoint rather than a general-purpose loan schedule API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/53/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/53/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, this specific loans/schedule endpoint is not documented on the provider's site, there is no OpenAPI spec, no request/response examples, and the docs pages are empty. The listing is essentially a stub with only the x402 challenge and URL path to go 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'/request':136 '0.02':128,135 '000':119 '20':118 '53':42 '6':124 'accept':84 'access':150 'across':138 'advertis':132,168 'ai/ml':64 'among':166 'amort':2,15,34 'amortization calculator' 'amount':113 'analyt':63 'api':4,17,60,143,169,209 'attach':98 'base':12,25,78,110,120 'base-network' 'behind':73 'broader':52 'call':59,116 'caller':97 'categori':170 'connect':215 'contain':104 'content':221 'crawl':204 'crypto':67 'data':62 'decim':125 'detail':195 'doc':206 'document':196 'endpoint':28,83,140,155 'equal':127 'exact':173 'exampl':198 'financ':66 'flat':134 'format':178 'found':201 'function':184 'gate':72 'handl':92 'header':103 'id':41 'infer':65,186 'input':174 'instant':149 'json':89 'json-api' 'key':144 'land':164 'limit':147 'list':159 'loan':1,14,33,39,40,182 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':30 'maximum':112 'micropay':75 'mortgage schedule API' 'network':79 'note':151 'offer':54 'openapi':193 'page':165,210 'part':49 'path':46,191 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment':90,102,108 'per':7,20,58,115 'platform':53,131 'post':85 'price':137,207 'prompt':217 'protocol':96 'provid':162 'rate':146 'request':8,21,86 'requir':114 'respons':177,199 'return':31,88,212 'schedul':3,16,35,183 'schema':175 'servic':70 'sign':106 'sole':187 'span':61 'spec':194 'specif':38,154 'substant':220 'unit':121 'unknown':180 'url':45,190 'usd':129 'usdc':13,26,81,107,123 'usdc-micropayment' 'use':80 'util':69 'various':55 'via':9,22,93 'wallet':216 'x':101 'x-payment':100 'x402':10,23,74,95 'x402-payment'","prices":[{"id":"2d68d898-4bcc-464b-b3b3-07737114dcf2","listingId":"46ff0e2e-0510-44e8-acf6-36ed9df662b4","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/53/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":"2026-04-18T18:47:54.309Z"}],"sources":[{"listingId":"46ff0e2e-0510-44e8-acf6-36ed9df662b4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/53/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:54.309Z","lastSeenAt":"2026-04-29T07:05:32.498Z"}],"details":{"listingId":"46ff0e2e-0510-44e8-acf6-36ed9df662b4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/53/schedule \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-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 requiring USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/loans/53/schedule"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/53/schedule"}],"useCases":["Retrieving a payment schedule for a specific loan","Integrating loan amortization data into financial dashboards","Agent-driven loan analysis workflows that pay per call"],"bestFor":["Developers needing on-demand loan schedule data without API key management","AI agents that can settle USDC micropayments on Base","Applications requiring pay-as-you-go financial calculations"],"notFor":["Users who need bulk/batch loan calculations at volume discounts","Anyone without a Base-compatible USDC wallet","Use cases requiring detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.29Z"},"updatedAt":"2026-04-29T07:05:32.498Z"}}