{"id":"72f010da-0208-4b2d-b4c8-8770b96922af","shortId":"XLwTTk","kind":"x402","title":"Loan amortization schedule API, pay-per-request via x402 on Base with USDC.","tagline":"Loan amortization schedule API, pay-per-request via x402 on Base with USDC.","description":"This endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 69 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. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required. Payment is handled inline via the X-PAYMENT header per the x402 protocol.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render 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 loan schedule endpoint expects or returns. The endpoint path suggests it serves a pre-configured loan (ID 69), but it is unclear whether the POST body allows customization of loan parameters or if other loan IDs are available. Treat this as a minimally documented endpoint.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-settlement","base-network","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 API documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no content.","No OpenAPI or input/output schema provided; request body format and response structure are unknown.","The endpoint path is hardcoded to loan ID 69; it is unclear if other loan IDs exist or if parameters can be customized.","The platform lists many endpoint categories (AI, analytics, finance, infrastructure) but no evidence of detailed docs for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/69/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/69/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 (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The specific purpose of this loan schedule endpoint is only inferable from the URL path. This is effectively a stub 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'/docs':160 '/pricing':161 '/readme':164 '/request':124 '0.02':112,123 '000':102 '0x8335':107 '20':101 '6':117 '69':44,210 'accept':87 'across':126 'advertis':121 'ai/ml':66 'allow':219 'amort':2,16,36 'amortization calculator' 'analyt':65 'api':4,18,62,131 'avail':230 'base':12,26,81,103,109 'base-network' 'bodi':218 'broader':54 'call':61 'challeng':95 'commit':139 'configur':207 'connect':170 'content':176 'cost':99 'crypto':69 'custom':220 'data':64 'debt amortization' 'decim':118 'descript':187 'document':155,236 'endpoint':30,86,128,194,199,237 'equal':111 'exampl':184 'expect':195 'extrem':157 'field':190 'financ':68 'handl':143 'header':150 'id':43,209,228 'indic':96 'infer':67 'inlin':144 'json':92 'json-api' 'key':132 'limit':135 'loan':1,15,35,41,42,192,208,222,227 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'lowpaymentfee.com':32 'maximum':98 'minim':235 'minimum':138 'mortgage schedule' 'network':82 'offer':56 'openapi':180 'page':165 'paramet':223 'part':51 'path':48,200 'pay':6,20,59 'pay-per-cal':58 'pay-per-request':5,19 'payment':141,149 'payment breakdown' 'per':7,21,60,113,151 'platform':55,120 'post':88,217 'pre':206 'pre-configur':205 'price':125 'prompt':172 'protocol':78,154 'rate':134 'render':167 'request':8,22,89,114 'request/response':183 'requir':140 'return':33,91,197 'schedul':3,17,37,193 'schema':181 'serv':203 'servic':72 'settl':74 'span':63 'spars':158 'specif':40 'substant':175 'suggest':201 'treat':231 'unclear':214 'uniform':122 'unit':104 'url':47 'usdc':14,28,84,106,115 'usdc-settlement' 'use':83,116 'util':71 'various':57 'via':9,23,75,145 'wallet':171 'whether':215 'x':148 'x-payment':147 'x402':10,24,77,94,153 'x402-payment'","prices":[{"id":"ebca2292-6cee-4632-9b4e-03ed562c97dd","listingId":"72f010da-0208-4b2d-b4c8-8770b96922af","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/69/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":"2026-04-18T18:47:51.932Z"}],"sources":[{"listingId":"72f010da-0208-4b2d-b4c8-8770b96922af","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/69/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:51.932Z","lastSeenAt":"2026-04-29T08:05:48.867Z"}],"details":{"listingId":"72f010da-0208-4b2d-b4c8-8770b96922af","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/69/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 returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/69/schedule"},{"claim":"Platform advertises $0.02/request uniform 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/69/schedule"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieve a loan amortization schedule showing payment breakdowns over time","Integrate loan schedule data into financial planning tools or dashboards","Programmatic access to loan payment calculations without API key management"],"bestFor":["Agents or apps needing on-demand loan schedule data with crypto micropayments","Developers who want keyless, pay-per-call financial APIs on Base","Quick prototyping of financial tools without subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Production systems requiring guaranteed SLAs or support contracts","Bulk loan portfolio analysis (no evidence of batch or multi-loan endpoints)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.38Z"},"updatedAt":"2026-04-29T08:05:48.867Z"}}