{"id":"69da6406-5e6b-41cf-9331-02c4992aa943","shortId":"f4w9JM","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 92 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 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 the loan schedule payload looks like or what POST body (if any) is required. The specific loan ID 92 is hardcoded in the URL, and it is unclear whether other loan IDs are available or how loans are created. The platform advertises no API keys, no rate limits, and instant access at $0.02 per request.","tags":[],"capabilities":["loan-schedule","amortization","pay-per-request","x402-payment","usdc-settlement","base-network","json-api"],"categories":["finance"],"synonyms":["loan amortization schedule","loan payment schedule","loan calculator API","amortization table","payment breakdown","loan repayment schedule","x402 finance API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty beyond a wallet connect prompt","No request body schema or response schema documented; unclear what POST body is expected","Loan ID 92 is hardcoded in the endpoint URL with no explanation of how loans are created or what IDs are valid","Platform appears to be a generic multi-category API storefront; the specific loan schedule functionality is unverified beyond the 402 challenge"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/92/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/92/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 and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation of what the endpoint actually returns, and the loan ID is hardcoded with no explanation. All doc pages beyond the landing page are empty wallet-connect 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'/docs':150 '/pricing':152 '/readme':154 '0.02':103,233 '000':98 '20':97 '402':90 '6':108 '92':42,199 'accept':133 'access':231 'address':124 'advertis':222 'ai/ml':64 'amort':2,15,34 'amortization' 'amortization table' 'analyt':63 'api':4,17,60,224 'application/json':130 'avail':214 'base':12,25,79,99 'base-network' 'beyond':142 'bodi':190 'broader':52 'call':59 'challeng':91 'connect':160 'content':166 'creat':219 'crypto':67 'data':62 'decim':109 'discover':140 'document':141,175 'endpoint':28,84,132 'exact':118 'exampl':178 'extrem':147 'financ':66 'hardcod':201 'id':41,198,212 'infer':65 'instant':230 'json-api' 'key':225 'land':144 'like':186 'limit':228 'live':86 'loan':1,14,33,39,40,182,197,211,217 'loan amortization schedule' 'loan calculator API' 'loan payment schedule' 'loan repayment schedule' 'loan-schedule' 'look':185 'lowpaymentfee.com':30 'made':114 'mark':138 'mime':127 'network':80 'offer':54 'openapi':170 'page':145,155 'part':49 'path':46 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payload':184 'payment':93,112 'payment breakdown' 'per':7,20,58,110,234 'platform':53,221 'post':134,189 'prompt':162 'protocol':76 'rate':227 'render':157 'request':8,21,92,111,135,235 'request/response':173 'requir':194 'respons':126 'return':31,88 'schedul':3,16,35,183 'schema':174 'scheme':119 'servic':70 'settl':72 'sinc':105 'span':61 'spars':148 'spec':171 'specif':38,196 'specifi':122 'substant':165 'type':128 'unclear':208 'unit':100 'url':45,204 'usd':104 'usdc':13,26,82,102,106 'usdc-settlement' 'use':81,107 'util':69 'various':55 'via':9,22,73,115 'wallet':123,161 'whether':209 'x402':10,23,75,117 'x402 finance API' 'x402-payment'","prices":[{"id":"85e98cf3-77ca-4cd7-bc50-01b78350cb6e","listingId":"69da6406-5e6b-41cf-9331-02c4992aa943","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/92/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":"2026-04-18T18:48:05.156Z"}],"sources":[{"listingId":"69da6406-5e6b-41cf-9331-02c4992aa943","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/92/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:05.156Z","lastSeenAt":"2026-04-29T05:34:21.807Z"}],"details":{"listingId":"69da6406-5e6b-41cf-9331-02c4992aa943","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/92/schedule \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requesting up to 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/92/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":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/92/schedule"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieve a loan amortization schedule showing principal and interest breakdowns per period","Integrate pay-per-call loan schedule data into financial planning tools","Programmatic access to loan payment schedules without API key management"],"bestFor":["Agents or apps needing on-demand loan schedule data with crypto micropayments","Developers wanting keyless, pay-as-you-go financial APIs on Base","Quick prototyping of loan amortization features without subscription commitments"],"notFor":["Production systems requiring documented request/response schemas and SLAs","Users who need to create or manage custom loans (no evidence of loan creation endpoints)","Applications requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.739Z"},"updatedAt":"2026-04-29T05:34:21.807Z"}}