{"id":"844a3103-942d-432a-bbf5-6c74df3c5725","shortId":"XXpyWn","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 52 in the URL path). It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance, and utility categories, all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint is live and returns a 402 challenge requesting payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per request. Payment is made via the x402 \"exact\" scheme to a specified wallet address. The response MIME type is application/json. The endpoint accepts POST requests and is marked as discoverable.\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 substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what fields the loan schedule response contains or what POST body (if any) is expected. The loan ID 52 is hardcoded in the URL, and it is unclear whether other loan IDs are available or how loans are created. The platform advertises uniform $0.02/request pricing, no API keys, no rate limits, and instant access.","tags":[],"capabilities":["loan-schedule","amortization","x402-payment","usdc-settlement","base-network","pay-per-request","json-api"],"categories":["finance"],"synonyms":["loan amortization schedule","loan payment schedule","loan calculator API","amortization table","payment breakdown","loan repayment schedule"],"warnings":["No OpenAPI or schema documentation available — request body and response structure are completely unknown","All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no content","The loan ID (52) is hardcoded in the endpoint URL; it is unclear if other loan IDs exist or how loans are created","The specific endpoint /api/v1/loans/52/schedule is not listed on the provider's landing page among their advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/52/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/52/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is virtually no documentation: no OpenAPI spec, no request/response schema, no examples, and all doc pages render only 'Connect wallet'. The loan ID is hardcoded and it's unclear what the endpoint actually returns or accepts. This is effectively a stub 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'/docs':147 '/pricing':149 '/readme':151 '/request':221 '0.02':100,220 '000':95 '20':94 '402':87 '52':42,195 '6':105 'accept':130 'access':231 'across':60 'address':121 'advertis':218 'ai/ml':63 'amort':2,15,34 'amortization' 'amortization table' 'analyt':62 'api':4,17,59,224 'application/json':127 'avail':210 'base':12,25,76,96 'base-network' 'beyond':139 'bodi':187 'broader':52 'call':58 'categori':67 'challeng':88 'connect':157 'contain':183 'content':163 'creat':215 'data':61 'decim':106 'discover':137 'document':138,172 'endpoint':28,81,129 'exact':115 'exampl':175 'expect':191 'extrem':144 'field':178 'financ':64 'hardcod':197 'id':41,194,208 'instant':230 'json-api' 'key':225 'land':141 'limit':228 'live':83 'loan':1,14,33,39,40,180,193,207,213 'loan amortization schedule' 'loan calculator API' 'loan payment schedule' 'loan repayment schedule' 'loan-schedule' 'lowpaymentfee.com':30 'made':111 'mark':135 'mime':124 'network':77 'offer':54 'openapi':167 'page':142,152 'part':49 'path':46 'pay':6,19,56 'pay-per-cal':55 'pay-per-request':5,18 'payment':90,109 'payment breakdown' 'per':7,20,57,107 'platform':53,217 'post':131,186 'price':222 'prompt':159 'protocol':73 'rate':227 'render':154 'request':8,21,89,108,132 'request/response':170 'respons':123,182 'return':31,85 'schedul':3,16,35,181 'schema':171 'scheme':116 'settl':69 'sinc':102 'spars':145 'spec':168 'specif':38 'specifi':119 'substant':162 'type':125 'unclear':204 'uniform':219 'unit':97 'url':45,200 'usd':101 'usdc':13,26,79,99,103 'usdc-settlement' 'use':78,104 'util':66 'via':9,22,70,112 'wallet':120,158 'whether':205 'x402':10,23,72,114 'x402-payment'","prices":[{"id":"5ef5d85e-d198-4638-9921-ba7d8c8dc3ef","listingId":"844a3103-942d-432a-bbf5-6c74df3c5725","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/52/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":"2026-04-18T18:47:51.289Z"}],"sources":[{"listingId":"844a3103-942d-432a-bbf5-6c74df3c5725","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/52/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:51.289Z","lastSeenAt":"2026-04-29T08:05:48.791Z"}],"details":{"listingId":"844a3103-942d-432a-bbf5-6c74df3c5725","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/52/schedule \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/52/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/52/schedule"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieve a detailed amortization schedule for a loan showing principal and interest breakdowns per period","Integrate loan schedule data into financial planning or lending applications","Automate loan payment calculations without managing API keys or subscriptions"],"bestFor":["Developers needing quick, keyless access to loan schedule data","Agents that can settle micropayments via x402 on Base","Prototyping financial tools without subscription commitments"],"notFor":["Production lending platforms needing configurable loan parameters (no documented input schema)","Users who cannot pay with USDC on the Base network","Applications requiring bulk or batch loan schedule generation"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.448Z"},"updatedAt":"2026-04-29T08:05:48.791Z"}}