{"id":"2eb18fd1-da2c-4618-b1ae-881e42d687b4","shortId":"sqYxKY","kind":"x402","title":"Loan amortization schedule API, pay-per-call at $0.02 via USDC on Base.","tagline":"Loan amortization schedule API, pay-per-call at $0.02 via USDC on Base.","description":"This x402-enabled endpoint at lowpaymentfee.com returns a loan amortization schedule for a specific loan (loan ID 80 in the URL path). It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 micropayments on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Each call costs a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). Payment is made via the x402 protocol's X-PAYMENT header, settling to a specified wallet address on Base. There are no API keys, no rate limits, and no subscription commitments — callers pay per request.\n\nDocumentation beyond the landing page is extremely thin: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples for this specific loans/schedule endpoint. The endpoint is confirmed live (returns a proper 402 challenge), but the exact request body format and response structure for the loan schedule are unknown.","tags":[],"capabilities":["loan-amortization-schedule","x402-payment","usdc-micropayment","base-network","pay-per-request","json-api"],"categories":["finance"],"synonyms":["loan schedule","amortization calculator","loan payment schedule","loan repayment plan","mortgage schedule API","loan calculator"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no technical content","No OpenAPI or schema definition found for this endpoint","Request body format and response structure for the loan schedule endpoint are undocumented","The endpoint is hardcoded to loan ID 80; it is unclear whether other loan IDs are supported or how loans are created","The broader platform lists many API categories but none appear to include a loans/schedule endpoint on the landing page, raising questions about completeness"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/80/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/80/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 challenge, confirming it exists and is gated at $0.02 USDC on Base. However, there is no documentation for request/response schemas, no OpenAPI spec, and the crawled docs/pricing/README pages are all empty beyond a wallet-connect prompt. The specific loan schedule endpoint's input parameters and output format are entirely 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'/docs':159 '/pricing':161 '/readme':163 '0.02':10,24,107 '000':102 '20':101 '402':202 '6':112 '80':47 'accept':89 'addit':174 'address':131 'ai/ml':69 'amort':2,16,39 'amortization calculator' 'analyt':68 'api':4,18,65,137 'base':14,28,83,103,133 'base-network' 'behind':78 'beyond':151 'bodi':208 'broader':57 'call':8,22,96 'caller':146 'challeng':203 'commit':145 'confirm':197 'connect':169 'cost':97 'crypto':72 'data':67 'decim':113 'detail':176 'document':150,185 'enabl':32 'endpoint':33,88,193,195 'exact':206 'exampl':188 'extrem':156 'financ':71 'format':209 'gate':77 'header':125 'id':46 'infer':70 'json':94 'json-api' 'key':138 'land':153 'limit':141 'live':198 'loan':1,15,38,44,45,215 'loan calculator' 'loan payment schedule' 'loan repayment plan' 'loan schedule' 'loan-amortization-schedule' 'loans/schedule':192 'lowpaymentfee.com':35 'made':116 'maximum':99 'micropay':80 'mortgage schedule API' 'network':84 'offer':59 'openapi':180 'page':154,164 'part':54 'path':51 'pay':6,20,62,147 'pay-per-cal':5,19 'pay-per-request':61 'payment':114,124 'per':7,21,63,148 'platform':58 'post':90 'prompt':171 'proper':201 'protocol':120 'rate':140 'render':166 'request':64,91,149,207 'request/response':183 'respons':211 'return':36,93,199 'schedul':3,17,40,216 'schema':184 'servic':75 'settl':126 'sinc':109 'span':66 'spec':181 'specif':43,191 'specifi':129 'structur':212 'subscript':144 'technic':175 'thin':157 'unit':104 'unknown':218 'url':50 'usd':108 'usdc':12,26,86,106,110 'usdc-micropayment' 'use':85,111 'util':74 'various':60 'via':11,25,117 'wallet':130,170 'x':123 'x-payment':122 'x402':31,79,119 'x402-enabled':30 'x402-payment'","prices":[{"id":"a8a9cda8-b6ea-40bf-a2b7-9fa0ae7f7b1b","listingId":"2eb18fd1-da2c-4618-b1ae-881e42d687b4","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/80/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":"2026-04-18T18:48:03.371Z"}],"sources":[{"listingId":"2eb18fd1-da2c-4618-b1ae-881e42d687b4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/80/schedule","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:03.371Z","lastSeenAt":"2026-04-29T06:34:07.533Z"}],"details":{"listingId":"2eb18fd1-da2c-4618-b1ae-881e42d687b4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/80/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/80/schedule"},{"claim":"The platform advertises $0.02 per request 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: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/80/schedule"}],"useCases":["Retrieving a payment-by-payment amortization schedule for a loan","Integrating loan schedule data into financial dashboards or planning tools","Programmatic access to loan repayment breakdowns without API key management"],"bestFor":["Agents or apps needing on-demand loan amortization data","Developers who prefer pay-per-call pricing over subscriptions","Crypto-native workflows that can settle USDC on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume batch processing where per-call costs add up","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.815Z"},"updatedAt":"2026-04-29T06:34:07.533Z"}}