{"id":"f104db32-60f2-4787-bf3a-4fd6f14a7f08","shortId":"Xygp7S","kind":"x402","title":"Loan amortization schedule endpoint, pay-per-call via x402 on Base (USDC).","tagline":"Loan amortization schedule endpoint, pay-per-call via x402 on Base (USDC).","description":"This x402-enabled endpoint at lowpaymentfee.com returns a loan amortization schedule for loan ID 61. It accepts POST requests and is gated behind a per-call USDC micropayment on the Base network. The x402 challenge advertises a maximum cost of $0.02 per request (20,000 base units of USDC with 6 decimals), settled on-chain to a specified wallet address.\n\nThe broader lowpaymentfee.com platform offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities—all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific endpoint cataloged here (/api/v1/loans/61/schedule) is not listed on the provider's landing page among the advertised APIs. Its exact input schema and response format are undocumented; the only confirmed detail is that it accepts HTTP POST, returns application/json, and requires an x402 payment header.\n\nBecause no OpenAPI spec, request body schema, or example responses are available for this endpoint, callers should expect to experiment or contact the provider for integration details. The endpoint is live and returning a valid x402 challenge.","tags":[],"capabilities":["loan-amortization-schedule","x402-micropayment","usdc-base-network","pay-per-call","json-response"],"categories":["finance"],"synonyms":["loan schedule","amortization table","loan repayment schedule","payment schedule","loan calculator","mortgage schedule"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/loans/61/schedule path is not listed among the provider's advertised APIs on the landing page","Request body format and response structure are completely undocumented","Docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no useful content","The hardcoded loan ID (61) in the path suggests this may be a single-resource demo rather than a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/61/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/61/schedule","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI spec, no documented request/response schema, no examples, and the specific loans/61/schedule path is not mentioned on the provider's own landing page. Essentially a stub with confirmed 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'0.02':69,124 '000':73 '20':72 '6':79 '61':42 'accept':44,173 'address':89 'advertis':64,155 'ai/ml':106 'among':153 'amort':2,15,37 'amortization table' 'analysi':109 'analyt':105 'api':102,129,156 'application/json':177 'avail':195 'base':12,25,59,74 'behind':50 'bodi':189 'broader':91 'call':8,21,54,101 'caller':199 'catalog':141 'chain':84 'challeng':63,220 'classif':111 'commit':136 'confirm':168 'contact':205 'cost':67 'crypto':115 'data':104,117 'decim':80 'detail':169,210 'embed':112 'enabl':30 'endpoint':4,17,31,140,198,212 'exact':158 'exampl':192 'expect':201 'experi':203 'financ':113 'format':163 'gate':49 'header':183 'howev':137 'http':174 'id':41 'infer':107 'infrastructur':119 'input':159 'integr':209 'json-response' 'key':130 'land':151 'limit':133 'list':146 'live':214 'loan':1,14,36,40 'loan calculator' 'loan repayment schedule' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':33,92 'market':116 'maximum':66 'micropay':56 'mortgage schedule' 'network':60 'offer':94 'on-chain':82 'openapi':186 'page':152 'pay':6,19,99 'pay-per-cal':5,18,98 'pay-per-call' 'payment':182 'payment schedule' 'per':7,20,53,70,100,125 'per-cal':52 'platform':93 'post':45,175 'price':122 'provid':149,207 'rate':132 'request':46,71,126,188 'requir':179 'respons':162,193 'return':34,176,216 'schedul':3,16,38 'schema':160,190 'sentiment':108 'settl':81 'span':103 'spec':187 'specif':139 'specifi':87 'summar':110 'undocu':165 'unit':75 'usdc':13,26,55,77 'usdc-base-network' 'util':120 'valid':218 'varieti':96 'via':9,22 'wallet':88 'x402':10,23,29,62,181,219 'x402-enabled':28 'x402-micropayment'","prices":[{"id":"ef78f1f7-df22-4a2a-b8af-1fdb6afc06ee","listingId":"f104db32-60f2-4787-bf3a-4fd6f14a7f08","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/61/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":"2026-04-18T18:47:45.843Z"}],"sources":[{"listingId":"f104db32-60f2-4787-bf3a-4fd6f14a7f08","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/61/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:45.843Z","lastSeenAt":"2026-04-29T09:09:04.577Z"}],"details":{"listingId":"f104db32-60f2-4787-bf3a-4fd6f14a7f08","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/61/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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x8335…) on Base network, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/loans/61/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":"The /api/v1/loans/61/schedule endpoint is not listed among the advertised APIs on the landing page","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieve an amortization schedule for a specific loan to display payment breakdowns","Integrate loan schedule data into a financial planning or budgeting application","Automate loan analysis by fetching structured repayment data per call"],"bestFor":["Developers needing on-demand loan amortization data without API key management","Agents that can settle USDC micropayments on Base for per-call access","Financial applications requiring structured loan schedule JSON"],"notFor":["Users who need bulk or batch loan schedule generation at scale (no documented batch endpoint)","Applications that cannot handle x402 payment flows or on-chain USDC settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.732Z"},"updatedAt":"2026-04-29T09:09:04.577Z"}}