{"id":"3647214e-eddf-4c73-9c38-64ca4ca2a9c5","shortId":"Txj3YT","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 75 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 the specified wallet address. The response MIME type is application/json, and the endpoint accepts POST requests. No API keys or rate limits are advertised — access is gated solely by micropayment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the schedule endpoint expects or returns. The loan ID (75) is hardcoded in the URL path, and it is unclear whether other loan IDs are available or how loans are created. The platform's landing page lists many other endpoints at $0.02 each, but this specific loans/schedule endpoint is not listed among them, suggesting it may be a less-documented or experimental offering.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-micropayment","base-network","pay-per-request","json-response"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","loan repayment plan","mortgage schedule","payment breakdown"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only a wallet connect prompt","No OpenAPI or request/response schema provided; request body format is unknown","This specific endpoint (/api/v1/loans/75/schedule) is not listed on the provider's landing page among advertised APIs","Loan ID 75 is hardcoded in the path; unclear if other loan IDs exist or how loans are created"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/75/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/75/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. However, there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint is not listed on the provider's own landing page. The loan ID is hardcoded and the purpose is only inferable from the URL path. Effectively a stub 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'000':95 '20':94 '402':87 '6':105 '75':42,194 'accept':131 'access':142 'across':60 'address':121 'advertis':141 'ai/ml':63 'among':236 'amort':2,15,34 'amortization calculator' 'analyt':62 'api':4,17,59,135,155 'application/json':127 'avail':210 'base':12,25,76,96 'base-network' 'broader':52 'call':58 'categori':67 'challeng':88 'connect':164 'content':170 'crawl':153 'creat':215 'data':61 'decim':106 'descript':181 'doc':154 'document':148,245 'endpoint':28,81,130,187,224,232 'exact':115 'exampl':178 'expect':188 'experiment':247 'extrem':150 'field':184 'financ':64 'gate':144 'hardcod':196 'id':41,193,208 'json-response' 'key':136 'land':219 'less':244 'less-docu':243 'limit':139 'list':221,235 'live':83 'loan':1,14,33,39,40,192,207,213 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'loans/schedule':231 'lowpaymentfee.com':30 'made':111 'mani':222 'may':240 'micropay':147 'mime':124 'mortgage schedule' 'network':77 'offer':54,248 'openapi':174 'page':159,220 'part':49 'path':46,200 'pay':6,19,56 'pay-per-cal':55 'pay-per-request':5,18 'payment':90,109 'payment breakdown' 'per':7,20,57,107 'platform':53,217 'post':132 'price':156 'prompt':166 'protocol':73 'rate':138 'readm':158 'request':8,21,89,108,133 'request/response':177 'respons':123 'return':31,85,161,190 'schedul':3,16,35,186 'schema':175 'scheme':116 'settl':69 'sinc':102 'sole':145 'spars':151 'specif':38,230 'specifi':119 'substant':169 'suggest':238 'type':125 'unclear':204 'unit':97 'url':45,199 'usd':101 'usdc':13,26,79,99,103 'usdc-micropayment' 'use':78,104 'util':66 'via':9,22,70,112 'wallet':120,165 'whether':205 'x402':10,23,72,114 'x402-payment'","prices":[{"id":"cc549b5b-35e6-43a8-a89a-77bc21a762fb","listingId":"3647214e-eddf-4c73-9c38-64ca4ca2a9c5","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/75/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":"2026-04-18T18:47:57.839Z"}],"sources":[{"listingId":"3647214e-eddf-4c73-9c38-64ca4ca2a9c5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/75/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:57.839Z","lastSeenAt":"2026-04-29T07:34:32.434Z"}],"details":{"listingId":"3647214e-eddf-4c73-9c38-64ca4ca2a9c5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/75/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 requesting up to 20,000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/75/schedule"},{"claim":"The 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":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/75/schedule"},{"claim":"Docs, API, pricing, and README pages return only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieve a loan amortization schedule showing principal and interest breakdown per period","Integrate loan schedule data into financial planning tools or dashboards","Programmatic access to payment schedules for automated financial analysis"],"bestFor":["Agents or apps needing on-demand loan amortization data without API key management","Developers who want to pay per request with crypto (USDC on Base)","Lightweight integrations that need a single loan schedule lookup"],"notFor":["Users who need to create or manage loans (no evidence of write endpoints)","Applications requiring detailed documentation or guaranteed SLAs","High-volume batch processing where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.167Z"},"updatedAt":"2026-04-29T07:34:32.434Z"}}