{"id":"077f29f6-863e-4e9c-aa56-50645193097f","shortId":"VYvFCp","kind":"x402","title":"Loan amortization schedule API on Base, paid per-call via x402 in USDC.","tagline":"Loan amortization schedule API on Base, paid per-call via x402 in USDC.","description":"This endpoint at lowpaymentfee.com returns a loan amortization schedule for a given loan (identified by ID in the URL path). It is part of a broader platform offering dozens of pay-per-request 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 specific endpoint `/api/v1/loans/42/schedule` accepts POST requests and returns JSON. Payment is handled inline: callers attach an X-PAYMENT header with a valid x402 payment proof. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the site's advertised flat $0.02/request pricing across all endpoints. No API keys, rate limits, or upfront commitments are required.\n\nThe platform advertises itself as a low-friction, keyless API marketplace. Documentation pages exist at /docs, /api, /pricing, and /README but currently render only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas are unavailable. The loan schedule endpoint's exact input parameters (e.g., principal, rate, term) and output fields are not documented in the crawled material, so callers will need to experiment or wait for fuller docs.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-settlement","base-network","per-call-pricing","no-api-key","json-response"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","mortgage schedule","loan repayment plan","payment breakdown","x402 finance API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content.","No request body schema or response schema is documented; input parameters for the loan schedule are unknown.","The endpoint path includes a hardcoded loan ID (42), which may be a demo resource rather than a general-purpose API.","The endpoint is not listed on the provider's own homepage among their advertised APIs, raising questions about its status."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/42/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/42/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, confirming it exists and accepts payments. However, all documentation pages render only 'Connect wallet' with no content. There is no OpenAPI spec, no request/response schema, and no examples — making the endpoint essentially a stub from a documentation perspective. The loan-specific path (/loans/42/schedule) suggests a fixed demo resource rather than a parameterized 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'/api/v1/loans/42/schedule':89 '/docs':171 '/pricing':173 '/readme':175 '/request':140 '0.02':130,139 '000':121 '20':120 '6':126 'accept':90 'across':142 'advertis':137,157 'ai/ml':67 'amort':2,16,36 'amortization calculator' 'amount':115 'analyt':66 'api':4,18,63,146,165 'attach':101 'base':6,20,82,122 'base-network' 'broader':54 'call':10,24,118 'caller':100,217 'commit':152 'connect':181 'consist':132 'content':187 'crawl':214 'crypto':70 'current':177 'data':65 'decim':127 'detail':189 'doc':226 'document':167,211 'dozen':57 'e.g':202 'endpoint':30,88,144,197 'equal':129 'exact':199 'exist':169 'experi':221 'field':208 'financ':69 'flat':138 'friction':163 'fuller':225 'given':40 'handl':98 'header':106 'id':44 'identifi':42 'infer':68 'inlin':99 'input':200 'json':95 'json-response' 'key':147 'keyless':164 'limit':149 'loan':1,15,35,41,195 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'low':162 'low-frict':161 'lowpaymentfee.com':32 'marketplac':166 'materi':215 'maximum':114 'mortgage schedule' 'need':219 'network':83 'no-api-key' 'offer':56 'output':207 'page':168 'paid':7,21 'paramet':201 'part':51 'path':48 'pay':60 'pay-per-request':59 'payment':96,105,111 'payment breakdown' 'per':9,23,61,117 'per-cal':8,22 'per-call-pricing' 'platform':55,156 'post':91 'price':141 'princip':203 'prompt':183 'proof':112 'protocol':79 'rate':148,204 'render':178 'request':62,92 'request/response':190 'requir':116,154 'return':33,94 'schedul':3,17,37,196 'schema':191 'servic':73 'settl':75 'site':135 'span':64 'specif':87 'substant':186 'term':205 'unavail':193 'unit':123 'upfront':151 'url':47 'usd':131 'usdc':14,28,85,125 'usdc-settlement' 'use':84 'util':72 'valid':109 'via':11,25,76 'wait':223 'wallet':182 'x':104 'x-payment':103 'x402':12,26,78,110 'x402 finance API' 'x402-payment'","prices":[{"id":"312c11b0-011f-4b9f-85db-38f95aefcd57","listingId":"077f29f6-863e-4e9c-aa56-50645193097f","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/42/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":"2026-04-18T18:47:33.763Z"}],"sources":[{"listingId":"077f29f6-863e-4e9c-aa56-50645193097f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/42/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:33.763Z","lastSeenAt":"2026-04-29T10:34:59.866Z"}],"details":{"listingId":"077f29f6-863e-4e9c-aa56-50645193097f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/42/schedule \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/42/schedule"},{"claim":"The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/42/schedule"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Generate an amortization schedule for a specific loan to see payment breakdowns over time","Integrate loan schedule data into a fintech dashboard or lending application","Allow AI agents to autonomously fetch loan repayment details with instant crypto micropayments"],"bestFor":["Developers needing on-demand loan amortization data without API key management","AI agents that can settle payments autonomously via x402 on Base","Fintech prototypes requiring quick, low-cost access to financial calculation endpoints"],"notFor":["Production systems that need detailed, documented request/response schemas (docs are currently empty)","Users who cannot pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.368Z"},"updatedAt":"2026-04-29T10:34:59.866Z"}}