{"id":"95668955-4c72-4bde-903a-376e5d1c4986","shortId":"xwqBUm","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 31 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 accepts POST requests and returns JSON. Payment is handled inline: callers attach an X-PAYMENT header containing a signed x402 payment. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The platform advertises a flat $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a wallet-connect prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The specific input parameters for the loan schedule endpoint (e.g., whether the loan ID is configurable, what fields the POST body expects) are unknown from the available material. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["loan-amortization-schedule","pay-per-request","x402-payment","usdc-settlement","base-network","json-api"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","loan repayment plan","mortgage schedule","debt amortization"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages are all empty beyond a wallet-connect prompt","No OpenAPI or request/response schema provided; input parameters for the POST body are unknown","The endpoint URL contains a hardcoded loan ID (31); it is unclear whether this is parameterizable","The broader platform lists many diverse API categories (AI, analytics, finance, utilities) all at $0.02 — the actual functionality behind each is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/31/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/31/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is zero documentation: no OpenAPI spec, no request/response schema, no examples, and all doc pages render only a wallet-connect prompt. The specific purpose (loan schedule for a hardcoded loan ID 31) is narrow and unclear without further 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'/docs':153 '/pricing':154 '/readme':157 '/request':132 '0.02':124,131 '000':115 '20':114 '31':42 '402':220 '6':120 'accept':85 'across':134 'advertis':128 'ai/ml':64 'amort':2,15,34 'amortization calculator' 'amount':109 'analyt':63 'api':4,17,60,139 'attach':96 'avail':183,210 'base':12,25,79,116 'base-network' 'bodi':204 'broader':52 'call':59,112 'caller':95 'challeng':221 'commit':147 'configur':199 'confirm':215 'connect':165 'contain':102 'content':170 'crypto':67 'data':62 'debt amortization' 'decim':121 'document':148 'e.g':193 'endpoint':28,84,136,192,213 'equal':123 'exampl':181 'expect':205 'extrem':150 'field':201 'financ':66 'flat':130 'handl':93 'header':101 'id':41,197 'infer':65 'inlin':94 'input':186 'json':90 'json-api' 'key':140 'limit':143 'live':216 'loan':1,14,33,39,40,190,196 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':30 'materi':211 'maximum':108 'minimum':146 'mortgage schedule' 'network':80 'offer':54 'openapi':174 'page':158 'paramet':187 'part':49 'path':46 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payload':182 'payment':91,100,106 'per':7,20,58,111 'platform':53,127 'post':86,203 'price':133 'prompt':166 'protocol':76 'rate':142 'render':160 'request':8,21,87 'request/response':177 'requir':110 'respons':222 'return':31,89 'schedul':3,16,35,191 'schema':178 'servic':70 'settl':72 'sign':104 'span':61 'spars':151 'spec':175 'specif':38,185 'substant':169 'unit':117 'unknown':207 'url':45 'usd':125 'usdc':13,26,82,119 'usdc-settlement' 'use':81 'util':69 'valid':219 'various':55 'via':9,22,73,217 'wallet':164 'wallet-connect':163 'whether':194 'x':99 'x-payment':98 'x402':10,23,75,105 'x402-payment'","prices":[{"id":"26d43ea7-f69a-4159-9f6f-00703aea9de3","listingId":"95668955-4c72-4bde-903a-376e5d1c4986","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/31/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":"2026-04-18T18:47:33.762Z"}],"sources":[{"listingId":"95668955-4c72-4bde-903a-376e5d1c4986","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/31/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:33.762Z","lastSeenAt":"2026-04-29T10:34:59.892Z"}],"details":{"listingId":"95668955-4c72-4bde-903a-376e5d1c4986","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/31/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/31/schedule"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and 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/31/schedule"}],"useCases":["Retrieving a detailed amortization schedule for a loan showing principal and interest breakdowns per period","Integrating loan schedule data into financial planning or lending applications","Agents autonomously fetching loan payment details without API key provisioning"],"bestFor":["Developers needing on-demand loan schedule calculations without subscription overhead","AI agents that can settle micropayments via x402 on Base","Applications requiring simple pay-per-call financial data without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Bulk or high-volume loan processing where per-request fees add up","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.291Z"},"updatedAt":"2026-04-29T10:34:59.892Z"}}