{"id":"fc4ae55d-ea44-4219-bcf3-75e3cab8d77c","shortId":"NbChya","kind":"x402","title":"Loan amortization schedule API, pay-per-call at $0.02 via USDC on Base.","tagline":"Loan amortization schedule API, pay-per-call at $0.02 via USDC on Base.","description":"This x402-enabled endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 7 in the URL path). It is part of a broader platform offering dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments.\n\nThe endpoint accepts POST requests and is gated by the x402 payment protocol. Callers must include an X-PAYMENT header containing a valid payment proof. Payment settles in USDC on the Base network (token contract 0x8335…2913). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. The response MIME type is application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation means callers must experiment to discover the expected POST body and response shape.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-base-settlement","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","mortgage schedule","loan repayment plan","payment breakdown","debt amortization"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The endpoint path is hardcoded to loan ID 7 — unclear if other loan IDs are supported or how to parameterize","No example request body or response body could be found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/7/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/7/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no examples, and all documentation pages render only a wallet-connect prompt. The specific purpose (loan 7 schedule) is narrow and 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'/docs':164 '/pricing':166 '/readme':168 '0.02':10,24,80,146 '000':137 '0x8335':129 '20':136 '2913':130 '402':203 '6':142 '7':47 'accept':95 'addit':179 'ai/ml':70 'amort':2,16,39 'amortization calculator' 'amount':133 'analyt':69 'api':4,18,66,85 'application/json':154 'avail':194 'base':14,28,125,138 'beyond':156 'bodi':219 'broader':57 'call':8,22,148 'caller':106,211 'challeng':204 'commit':92 'confirm':198 'connect':174 'contain':114 'contract':128 'crypto':73 'data':68 'debt amortization' 'decim':143 'detail':181 'discov':215 'document':155,209 'dozen':60 'enabl':32 'endpoint':33,94,196 'equal':145 'exampl':192 'expect':217 'experi':213 'extrem':161 'financ':72 'gate':100 'header':113 'id':46 'includ':108 'infer':71 'json-response' 'key':86 'lack':207 'land':158 'limit':89 'live':199 'loan':1,15,38,44,45 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':35 'max':132 'mean':210 'mime':151 'mortgage schedule' 'must':107,212 'network':126 'no-api-key' 'offer':59 'openapi':185 'page':159,169 'part':54 'path':51 'pay':6,20,63 'pay-per-cal':5,19 'pay-per-request':62 'payload':193 'payment':104,112,117,119 'payment breakdown' 'per':7,21,64,81,147 'platform':58 'post':96,218 'price':78 'prompt':176 'proof':118 'proper':202 'protocol':105 'rate':88 'render':171 'request':65,82,97 'request/response':188 'requir':134 'respons':150,221 'return':36,200 'schedul':3,17,40 'schema':189 'servic':76 'settl':120 'shape':222 'span':67 'spars':162 'spec':186 'specif':43 'technic':180 'token':127 'type':152 'unit':139 'url':50 'usdc':12,26,122,141 'usdc-base-settlement' 'util':75 'valid':116 'via':11,25 'wallet':175 'x':111 'x-payment':110 'x402':31,103 'x402-enabled':30 'x402-payment'","prices":[{"id":"5b3182a0-894a-4f15-9aa5-a3584ce12fb4","listingId":"fc4ae55d-ea44-4219-bcf3-75e3cab8d77c","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/7/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":"2026-04-18T18:47:55.435Z"}],"sources":[{"listingId":"fc4ae55d-ea44-4219-bcf3-75e3cab8d77c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/7/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:55.435Z","lastSeenAt":"2026-04-29T07:05:32.496Z"}],"details":{"listingId":"fc4ae55d-ea44-4219-bcf3-75e3cab8d77c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/7/schedule \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 network","source_url":"https://lowpaymentfee.com/api/v1/loans/7/schedule"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/7/schedule"}],"useCases":["Generating an amortization schedule for a loan to see principal and interest breakdowns per period","Integrating loan schedule data into a financial planning agent or dashboard","Programmatically retrieving payment schedules without API key registration"],"bestFor":["Agents needing on-demand loan amortization data with no signup","Developers prototyping financial tools who want instant pay-per-call access","Crypto-native applications that can settle micropayments in USDC on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume batch processing where $0.02 per call adds up significantly","Applications requiring customizable loan IDs (the endpoint path is hardcoded to loan 7)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.29Z"},"updatedAt":"2026-04-29T07:05:32.496Z"}}