{"id":"bd409d05-2743-4cc5-bda4-e6ee0ad6d472","shortId":"XpCdYY","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 77 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 settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint is live and responds with a 402 Payment Required challenge, indicating it accepts x402 exact-scheme payments of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per request. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base. The endpoint accepts POST requests and returns application/json. No API key or account registration is required — access is gated purely by micropayment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no further content. The specific request body schema for the loan schedule endpoint is not documented, and no example responses are available. The loan ID (77) is hard-coded in the URL path, suggesting either a demo/sample loan or that callers would substitute their own loan ID. Without documentation it is unclear what input parameters are expected or what fields the schedule response contains.","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","debt schedule"],"warnings":["No API documentation available — docs, pricing, and README pages all render only a wallet-connect prompt with no content","Request body schema for the loan schedule endpoint is completely unknown","Loan ID 77 is hard-coded in the endpoint path; unclear if this is a demo or if other IDs are supported","No example responses available to verify output format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/77/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/77/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 USDC per request on Base), but there is no documentation, no request/response schema, no examples, and the loan ID is hard-coded with no explanation. Effectively a stub 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'000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':126 '20':106 '402':91 '6':117 '77':42,196 'accept':97,131 'access':145 'account':141 'address':125 'ai/ml':64 'amort':2,15,34 'amortization calculator' 'analyt':63 'api':4,17,60,138,158 'application/json':136 'avail':192 'base':12,25,79,108,128 'base-network' 'bodi':177 'broader':52 'call':59 'caller':212 'challeng':94 'code':200 'connect':167 'contain':235 'content':173 'crawl':156 'crypto':67 'data':62 'debt schedule' 'decim':118 'demo/sample':208 'doc':157 'document':151,186,220 'either':206 'endpoint':28,84,130,183 'exact':100 'exact-schem':99 'exampl':189 'expect':228 'extrem':153 'field':231 'financ':66 'gate':147 'hard':199 'hard-cod':198 'id':41,195,218 'indic':95 'infer':65 'input':225 'json-api' 'key':139 'live':86 'loan':1,14,33,39,40,181,194,209,217 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':30 'micropay':150 'mortgage schedule' 'network':80 'offer':54 'page':162 'paramet':226 'part':49 'path':46,204 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment':92,102,121 'payment breakdown' 'per':7,20,58,119 'platform':53 'post':132 'price':159 'prompt':169 'protocol':76 'pure':148 'readm':161 'registr':142 'render':164 'request':8,21,120,133,176 'requir':93,144 'respond':88 'respons':190,234 'return':31,135 'schedul':3,16,35,182,233 'schema':178 'scheme':101 'sent':123 'servic':70 'settl':72 'sinc':114 'span':61 'spars':154 'specif':38,175 'substitut':214 'suggest':205 'unclear':223 'unit':109 'url':45,203 'usd':113 'usdc':13,26,82,111,115 'usdc-micropayment' 'use':81,116 'util':69 'various':55 'via':9,22,73 'wallet':168 'without':219 'would':213 'x402':10,23,75,98 'x402-payment'","prices":[{"id":"0f726779-4580-4127-a713-0525d73d7317","listingId":"bd409d05-2743-4cc5-bda4-e6ee0ad6d472","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/77/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":"bd409d05-2743-4cc5-bda4-e6ee0ad6d472","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/77/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:55.435Z","lastSeenAt":"2026-04-29T11:34:04.836Z"}],"details":{"listingId":"bd409d05-2743-4cc5-bda4-e6ee0ad6d472","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/77/schedule \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/77/schedule"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/77/schedule"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a Connect wallet prompt with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a detailed amortization schedule for a loan showing principal and interest breakdowns per period","Integrating loan schedule data into a financial planning agent or dashboard","Programmatic access to payment schedules without API key management"],"bestFor":["Agents needing on-demand loan amortization data via micropayment","Developers who want keyless, pay-per-call financial APIs","Crypto-native applications on Base that can settle USDC payments natively"],"notFor":["Users who need comprehensive loan origination or management features beyond schedule retrieval","Anyone requiring detailed API documentation or guaranteed SLAs before integration","Bulk or high-volume loan analytics where per-request pricing would be cost-prohibitive"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.251Z"},"updatedAt":"2026-04-29T11:34:04.836Z"}}