{"id":"4b93fd3c-fb73-4101-9652-fa31931bfdf8","shortId":"jDsc3c","kind":"x402","title":"Loan amortization schedule endpoint, pay-per-request via x402 on Base (USDC).","tagline":"Loan amortization schedule endpoint, pay-per-request via x402 on Base (USDC).","description":"This x402-enabled endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 72 in the URL path). It accepts POST requests and responds with JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme.\n\nThe endpoint charges a maximum of 20,000 base units of USDC per request. Since USDC uses 6 decimals, this equates to $0.02 per call — consistent with the site-wide flat pricing of $0.02/request advertised on the provider's landing page. No API keys or rate limits are required; access is granted instantly upon valid x402 payment.\n\nThe provider (lowpaymentfee.com) hosts a broader catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance, and utility services, all at the same $0.02 price point. However, the specific endpoint cataloged here is scoped to loan schedule data. Documentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all render only a wallet-connect prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no example payloads available, so the exact input parameters and output format must be discovered experimentally.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["loan schedule","amortization table","loan payment schedule","loan calculator","payment breakdown","debt schedule","x402 finance API"],"warnings":["No OpenAPI spec or schema available for request or response bodies","Documentation pages (/docs, /pricing, /README) render only a wallet-connect prompt with no content","Endpoint path is hardcoded to loan ID 72 — unclear if other loan IDs are supported or how to parameterize","The specific purpose and data source of this loan schedule endpoint are undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/72/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/72/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 captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation, and no example payloads. The endpoint path is hardcoded to loan ID 72 with no explanation of what that represents or how to parameterize it. Effectively a stub 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'/docs':186 '/pricing':188 '/readme':190 '/request':112 '0.02':99,111,162 '000':84 '0x8335':68 '20':83 '2913':69 '6':94 '72':45 'accept':51 'access':128 'advertis':113 'ai/ml':152 'amort':2,15,37 'amortization table' 'analyt':151 'api':121,148 'avail':216 'base':12,25,63,85 'beyond':178 'broader':141 'call':101 'catalog':142,169 'charg':79 'connect':198 'consist':102 'content':203 'contract':67 'data':150,176 'debt schedule' 'decim':95 'discov':227 'document':177 'enabl':30 'endpoint':4,17,31,78,168 'equat':97 'exact':74,219 'exact-pay':73 'exampl':214 'experiment':228 'extrem':183 'financ':154 'flat':108 'format':224 'grant':130 'host':139 'howev':165 'id':44 'infer':153 'input':220 'instant':131 'json':57 'json-response' 'key':122 'land':118,180 'limit':125 'loan':1,14,36,42,43,174 'loan calculator' 'loan payment schedule' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':33,138 'maximum':81 'must':225 'network':64 'no-api-key' 'openapi':207 'output':223 'page':119,181,191 'paramet':221 'path':49 'pay':6,19,145 'pay-per-request':5,18,144 'payload':215 'payment':58,75,135 'payment breakdown' 'per':7,20,89,100,146 'point':164 'post':52 'price':109,163 'prompt':199 'provid':116,137 'rate':124 'render':193 'request':8,21,53,90,147 'request/response':210 'requir':127 'respond':55 'return':34 'schedul':3,16,38,175 'schema':211 'scheme':76 'scope':172 'servic':157 'settl':60 'sinc':91 'site':106 'site-wid':105 'span':149 'spec':208 'specif':41,167 'substant':202 'thin':184 'unit':86 'upon':132 'url':48 'usdc':13,26,66,88,92 'usdc-base-network' 'use':65,93 'util':156 'valid':133 'via':9,22 'wallet':197 'wallet-connect':196 'wide':107 'x402':10,23,29,72,134 'x402 finance API' 'x402-enabled':28 'x402-payment'","prices":[{"id":"ba7697bc-50b0-4d62-aa90-694e14a8f23d","listingId":"4b93fd3c-fb73-4101-9652-fa31931bfdf8","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/72/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":"2026-04-18T18:47:50.673Z"}],"sources":[{"listingId":"4b93fd3c-fb73-4101-9652-fa31931bfdf8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/72/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:50.673Z","lastSeenAt":"2026-04-29T08:05:48.764Z"}],"details":{"listingId":"4b93fd3c-fb73-4101-9652-fa31931bfdf8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/72/schedule \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/72/schedule"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/72/schedule"}],"useCases":["Retrieve an amortization schedule for a loan to display payment breakdowns","Integrate loan schedule data into a financial planning tool","Automate loan analysis by fetching structured payment timelines"],"bestFor":["Agents needing on-demand loan schedule data without API key signup","Developers building financial dashboards with pay-per-call pricing","Crypto-native applications that can settle micropayments on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring bulk loan data across many loan IDs at scale"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.5Z"},"updatedAt":"2026-04-29T08:05:48.764Z"}}