{"id":"5cd80793-f617-4e77-9ab2-ea0f60313015","shortId":"CfPQQF","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 81) via a POST request. It is part of a broader platform offering various pay-per-call APIs across data analytics, AI/ML, finance, and utility categories, all settled through 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 to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base. The response MIME type is application/json. No API keys or rate limits are advertised; access is gated purely by the x402 micropayment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what fields the loan schedule endpoint accepts or returns. The endpoint path suggests it serves a pre-configured loan (ID 81), but it is unclear whether the POST body allows customization of loan parameters or simply triggers generation of a fixed schedule. Use with caution until more documentation is available.","tags":[],"capabilities":["loan-schedule","amortization","x402-payment","usdc","base-network","pay-per-request","json-api"],"categories":["finance"],"synonyms":["loan amortization","payment schedule","loan calculator","amortization table","loan repayment schedule","mortgage schedule"],"warnings":["No OpenAPI schema or request/response documentation available","Docs, API, pricing, and README pages all render only 'Connect wallet' with no useful content","Endpoint is hardcoded to loan ID 81; unclear if other loan IDs or custom parameters are supported","No information on what fields the POST body accepts or what the response contains"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/81/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/81/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 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the specific loan ID 81 is unexplained. Effectively a stub 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'000':96 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':115 '20':95 '402':88 '6':106 '81':42,196 'accept':181 'access':132 'across':61 'addit':161 'address':114 'advertis':131 'ai/ml':64 'allow':205 'amort':2,15,34 'amortization' 'amortization table' 'analyt':63 'api':4,17,60,125,147 'application/json':123 'avail':225 'base':12,25,77,97,117 'base-network' 'bodi':204 'broader':52 'call':59 'categori':68 'caution':220 'challeng':89 'configur':193 'connect':156 'content':162 'crawl':145 'custom':206 'data':62 'decim':107 'descript':173 'doc':146 'document':140,223 'endpoint':28,82,180,185 'exampl':170 'extrem':142 'field':176 'financ':65 'fix':216 'gate':134 'generat':213 'id':41,195 'json-api' 'key':126 'limit':129 'live':84 'loan':1,14,33,39,40,178,194,208 'loan amortization' 'loan calculator' 'loan repayment schedule' 'loan-schedule' 'lowpaymentfee.com':30 'made':112 'micropay':139 'mime':120 'mortgage schedule' 'network':78 'offer':54 'openapi':166 'page':151 'paramet':209 'part':49 'path':186 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payment':91,110 'payment schedule' 'per':7,20,58,108 'platform':53 'post':45,203 'pre':192 'pre-configur':191 'price':148 'prompt':158 'protocol':74 'pure':135 'rate':128 'readm':150 'render':153 'request':8,21,46,90,109 'request/response':169 'respons':119 'return':31,86,183 'schedul':3,16,35,179,217 'schema':167 'serv':189 'settl':70 'simpli':211 'sinc':103 'spars':143 'specif':38 'suggest':187 'trigger':212 'type':121 'unclear':200 'unit':98 'usd':102 'usdc':13,26,80,100,104 'use':79,105,218 'util':67 'various':55 'via':9,22,43 'wallet':157 'whether':201 'x402':10,23,73,138 'x402-payment'","prices":[{"id":"79290ff4-9ecc-4e26-a95c-dc6486d869a1","listingId":"5cd80793-f617-4e77-9ab2-ea0f60313015","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/81/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":"2026-04-18T18:47:58.437Z"}],"sources":[{"listingId":"5cd80793-f617-4e77-9ab2-ea0f60313015","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/81/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:58.437Z","lastSeenAt":"2026-04-29T06:34:07.261Z"}],"details":{"listingId":"5cd80793-f617-4e77-9ab2-ea0f60313015","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/81/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","source_url":"https://lowpaymentfee.com/api/v1/loans/81/schedule"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/81/schedule"}],"useCases":["Retrieving a loan amortization schedule showing principal and interest breakdowns per period","Integrating loan payment data into financial planning tools or dashboards","Agent-driven financial calculations requiring on-demand loan schedule generation"],"bestFor":["Developers needing a simple pay-per-call loan schedule API without signup","AI agents that can settle x402 micropayments on Base for financial data","Prototyping financial applications that need amortization data"],"notFor":["Production systems requiring well-documented, schema-validated APIs","Users who need to compute schedules for arbitrary loan IDs or custom parameters (unclear if supported)","Non-crypto users who cannot settle USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.172Z"},"updatedAt":"2026-04-29T06:34:07.261Z"}}