{"id":"493984f3-9740-43fb-a4d5-567c89b7ff78","shortId":"hb9Nh9","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 67) via a POST request. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance, and utility categories, all settled on-chain using the x402 protocol on the Base network with USDC.\n\nThe x402 challenge confirms the endpoint is live and accepts payments of up to $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). Payment is made via the x402 exact scheme to a specified wallet address, with a 300-second timeout. The response MIME type is application/json. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The specific loan schedule endpoint path includes a hardcoded loan ID (67), and it is unclear whether this is a demo resource or whether other loan IDs are available. The input schema and expected POST body fields (e.g., loan parameters) are not documented anywhere in the crawled material.","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 amortization"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema for request or response bodies","Endpoint path includes hardcoded loan ID (67); unclear if other loan IDs are supported or how to create loans","No examples of request payloads or response structures available anywhere in crawled content","POST body parameters are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/67/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/67/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 (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The endpoint path contains a hardcoded loan ID with no explanation. This is effectively a stub 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'000':101 '20':100 '300':125 '6':107 '67':42,195 'accept':92 'access':142 'across':60 'address':122 'advertis':141 'ai/ml':63 'amort':2,15,34 'amortization calculator' 'analyt':62 'anywher':227 'api':4,17,59,135,155 'application/json':133 'avail':183,212 'base':12,25,79,102 'base-network' 'bodi':219 'broader':52 'call':58 'categori':67 'chain':72 'challeng':85 'confirm':86 'connect':164 'content':170 'crawl':153,230 'data':61 'debt amortization' 'decim':108 'demo':204 'doc':154 'document':148,226 'e.g':221 'endpoint':28,88,188 'exact':116 'exampl':181 'expect':217 'extrem':150 'field':220 'financ':64 'gate':144 'hardcod':192 'id':41,194,210 'includ':190 'input':214 'json-api' 'key':136 'limit':139 'live':90 'loan':1,14,33,39,40,186,193,209,222 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':30 'made':112 'materi':231 'micropay':147 'mime':130 'mortgage schedule' 'network':80 'offer':54 'on-chain':70 'openapi':174 'page':159 'paramet':223 'part':49 'path':189 'pay':6,19,56 'pay-per-cal':55 'pay-per-request':5,18 'payload':182 'payment':93,110 'payment breakdown' 'per':7,20,57,98 'platform':53 'post':45,218 'price':156 'prompt':166 'protocol':76 'pure':145 'rate':138 'readm':158 'render':161 'request':8,21,46,99 'request/response':177 'resourc':205 'respons':129 'return':31 'schedul':3,16,35,187 'schema':178,215 'scheme':117 'second':126 'settl':69 'spars':151 'spec':175 'specif':38,185 'specifi':120 'timeout':127 'type':131 'unclear':199 'unit':103 'usdc':13,26,82,105 'usdc-micropayment' 'use':73 'util':66 'via':9,22,43,113 'wallet':121,165 'whether':200,207 'x402':10,23,75,84,115 'x402-payment'","prices":[{"id":"e5f6c8d5-69b8-4c2a-a1ab-aab21c49a1e8","listingId":"493984f3-9740-43fb-a4d5-567c89b7ff78","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/67/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":"2026-04-18T18:47:51.308Z"}],"sources":[{"listingId":"493984f3-9740-43fb-a4d5-567c89b7ff78","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/67/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:51.308Z","lastSeenAt":"2026-04-29T08:05:48.841Z"}],"details":{"listingId":"493984f3-9740-43fb-a4d5-567c89b7ff78","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/67/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":"Endpoint returns 402 with x402 challenge accepting USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/loans/67/schedule"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/67/schedule"}],"useCases":["Retrieving a loan amortization schedule showing principal and interest breakdowns per period","Integrating loan payment calculations into financial planning tools","Agent-driven financial analysis requiring on-demand loan schedule data"],"bestFor":["Developers needing on-demand loan schedule data without API key management","AI agents that can settle x402 micropayments on Base for financial data","Applications requiring pay-per-use loan amortization without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Bulk loan schedule generation across many loan IDs (no batch endpoint documented)","Users without USDC on Base network for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.413Z"},"updatedAt":"2026-04-29T08:05:48.841Z"}}