{"id":"5d1d4f48-f9f9-4b7d-9d3a-163bd5c252e2","shortId":"rGskfb","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 70 in the URL path). It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance, and utility categories, 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 further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what parameters the POST body should contain or what the schedule response looks like. The loan ID (70) is hardcoded in the URL path, and it is unclear whether other loan IDs are available or how loans are created. The platform advertises $0.02 per request with no API keys, no rate limits, and instant access.","tags":[],"capabilities":["loan-schedule","amortization","pay-per-request","x402-payment","usdc-base-network","json-api"],"categories":["finance"],"synonyms":["loan amortization schedule","loan payment schedule","loan calculator API","amortization table","loan repayment plan","mortgage schedule"],"warnings":["No OpenAPI or schema documentation available — request body format and response structure are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","Loan ID 70 is hardcoded in the endpoint path; it is unclear how to access other loans or create new ones","The specific /loans/70/schedule endpoint is not listed on the provider's landing page among advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/70/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/70/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 402 challenge, but there is virtually no documentation: no OpenAPI spec, no request/response schema, no examples, and the docs pages are empty. The loan ID is hardcoded in the path with no explanation. This is effectively a stub 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'/docs':147 '/pricing':149 '/readme':151 '0.02':100,219 '000':95 '20':94 '402':87 '6':105 '70':42,194 'accept':130 'access':231 'across':60 'address':121 'advertis':218 'ai/ml':63 'amort':2,15,34 'amortization' 'amortization table' 'analyt':62 'api':4,17,59,224 'application/json':127 'avail':210 'base':12,25,76,96 'beyond':139 'bodi':181 'broader':52 'call':58 'categori':67 'challeng':88 'connect':157 'contain':183 'content':163 'creat':215 'data':61 'decim':106 'discover':137 'document':138,172 'endpoint':28,81,129 'exact':115 'exampl':175 'extrem':144 'financ':64 'hardcod':196 'id':41,193,208 'instant':230 'json-api' 'key':225 'land':141 'like':190 'limit':228 'live':83 'loan':1,14,33,39,40,192,207,213 'loan amortization schedule' 'loan calculator API' 'loan payment schedule' 'loan repayment plan' 'loan-schedule' 'look':189 'lowpaymentfee.com':30 'made':111 'mark':135 'mime':124 'mortgage schedule' 'network':77 'offer':54 'openapi':167 'page':142,152 'paramet':178 'part':49 'path':46,200 'pay':6,19,56 'pay-per-cal':55 'pay-per-request':5,18 'payment':90,109 'per':7,20,57,107,220 'platform':53,217 'post':131,180 'prompt':159 'protocol':73 'rate':227 'render':154 'request':8,21,89,108,132,221 'request/response':170 'respons':123,188 'return':31,85 'schedul':3,16,35,187 'schema':171 'scheme':116 'settl':69 'sinc':102 'spars':145 'spec':168 'specif':38 'specifi':119 'type':125 'unclear':204 'unit':97 'url':45,199 'usd':101 'usdc':13,26,79,99,103 'usdc-base-network' 'use':78,104 'util':66 'via':9,22,70,112 'wallet':120,158 'whether':205 'x402':10,23,72,114 'x402-payment'","prices":[{"id":"74220238-4045-4169-af76-a03cf09a5bcf","listingId":"5d1d4f48-f9f9-4b7d-9d3a-163bd5c252e2","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/70/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":"2026-04-18T18:47:50.078Z"}],"sources":[{"listingId":"5d1d4f48-f9f9-4b7d-9d3a-163bd5c252e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/70/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:50.078Z","lastSeenAt":"2026-04-29T08:05:48.772Z"}],"details":{"listingId":"5d1d4f48-f9f9-4b7d-9d3a-163bd5c252e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/70/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/70/schedule"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/70/schedule"}],"useCases":["Retrieve a detailed amortization schedule for a loan showing principal and interest breakdowns per period","Integrate loan schedule data into financial planning or lending applications","Automate loan payment calculations without maintaining a subscription or API key"],"bestFor":["Agents or apps needing on-demand loan schedule data without signup","Developers wanting crypto-native pay-per-call financial APIs","Quick prototyping of lending or financial planning tools"],"notFor":["Production use requiring documented request/response schemas and SLAs","Bulk or high-volume loan origination workflows (no documented batch support)","Users who cannot pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.499Z"},"updatedAt":"2026-04-29T08:05:48.772Z"}}