{"id":"e872f397-7abc-414b-9d10-090d63ee0403","shortId":"QQjjXW","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 68 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 gated behind the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/loans/68/schedule` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 endpoint is live (returns a proper 402 x402 challenge), but without documentation it is unclear what request body fields are expected or what the response schedule format looks like. The loan ID 68 is hardcoded in the path, and it is unknown whether other loan IDs are available or how loans are created.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-base","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 documentation available — /docs, /pricing, /api, and /README all return only a wallet connect prompt","No request or response schema provided; request body format is unknown","Loan ID 68 is hardcoded in the path with no explanation of how loans are created or what IDs are valid","The endpoint's actual domain name 'lowpaymentfee.com' and generic 'Premium API Access' description provide little confidence about the service's legitimacy or longevity"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/68/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/68/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 challenge with clear pricing, but there is zero documentation on request parameters, response schema, or what loan ID 68 represents. No OpenAPI spec, no examples, and all doc pages are empty. This is effectively a stub 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'/api/v1/loans/68/schedule':87 '/docs':151 '/pricing':152 '/readme':155 '/request':129 '0.02':114,128 '000':103 '0x8335':108 '20':102 '2913':109 '402':188 '6':119 '68':42,214 'accept':88 'across':131 'advertis':97 'ai/ml':64 'amort':2,15,34 'amortization calculator' 'analyt':63 'api':4,17,60,136 'avail':180,229 'base':12,25,80,104,111 'behind':73 'bodi':199 'broader':52 'call':59 'challeng':96,190 'commit':144 'confirm':126 'connect':161 'content':167 'cost':100 'creat':234 'crypto':67 'data':62 'debt amortization' 'decim':120 'document':146,193 'endpoint':28,86,133,182 'equal':113 'exampl':178 'expect':202 'extrem':148 'field':200 'financ':66 'format':208 'gate':72 'hardcod':216 'id':41,213,227 'infer':65 'json':93 'json-api' 'key':137 'land':124 'like':210 'limit':140 'live':184 'loan':1,14,33,39,40,212,226,232 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'look':209 'lowpaymentfee.com':30 'maximum':99 'minimum':143 'mortgage schedule' 'network':81 'offer':54 'openapi':171 'page':125,156 'part':49 'path':46,219 'pay':6,19,57 'pay-per-cal':56 'pay-per-request':5,18 'payload':179 'payment':76 'payment breakdown' 'per':7,20,58,115 'platform':53,122 'post':89 'price':130 'prompt':163 'proper':187 'protocol':77 'rate':139 'render':158 'request':8,21,90,116,198 'request/response':174 'requir':145 'respons':206 'return':31,92,185 'schedul':3,16,35,207 'schema':175 'servic':70 'span':61 'spars':149 'spec':172 'specif':38,85 'unclear':196 'uniform':127 'unit':105 'unknown':223 'url':45 'usdc':13,26,83,107,117 'usdc-base' 'use':82,118 'util':69 'various':55 'via':9,22 'wallet':162 'whether':224 'without':192 'x402':10,23,75,95,189 'x402-payment'","prices":[{"id":"d8f11a42-29dc-4336-a324-388bb28a2055","listingId":"e872f397-7abc-414b-9d10-090d63ee0403","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/68/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":"2026-04-18T18:47:50.673Z"}],"sources":[{"listingId":"e872f397-7abc-414b-9d10-090d63ee0403","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/68/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:50.673Z","lastSeenAt":"2026-04-29T08:05:48.735Z"}],"details":{"listingId":"e872f397-7abc-414b-9d10-090d63ee0403","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/68/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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/loans/68/schedule"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/68/schedule"}],"useCases":["Retrieving an amortization schedule for a loan to see payment breakdowns over time","Integrating loan schedule data into a financial planning agent or dashboard","Programmatic access to loan payment details without API key registration"],"bestFor":["Agents needing on-demand loan amortization data with no signup","Developers prototyping financial tools who want instant pay-per-call access","x402-compatible wallets and agents on the Base network"],"notFor":["Users who need to create or manage loans (no evidence of write/create endpoints for loans)","Production use cases requiring documented request/response schemas and SLAs","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.531Z"},"updatedAt":"2026-04-29T08:05:48.735Z"}}