{"id":"c8737f90-bc0e-49f8-8219-e1007dc7b5ae","shortId":"9G2NLN","kind":"x402","title":"Pay-per-call loan data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call loan data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/v1/loans/1`) is listed under \"Premium API Access\" and returns JSON data when a valid x402 payment header is provided. Payments are settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are advertised; access is gated entirely by the micropayment.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several categories: data & analytics (metrics, reports, exports, insights), AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, this listing covers only the `/api/v1/loans/1` endpoint, which appears to be a finance-related resource returning loan data. The exact response schema is not documented in the crawled material.\n\nThe endpoint is live and returns a proper 402 challenge with x402 version 1. Documentation pages (/docs, /pricing, /api, /README) all resolve but contain only a \"Connect wallet\" prompt with no substantive technical documentation, so the actual request/response schemas remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","loan-data","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["loan API","x402 micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","loan data endpoint","crypto payment API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all return only a 'Connect wallet' prompt with no technical content.","The /api/v1/loans/1 endpoint is not listed on the provider's homepage among their advertised endpoints, making its purpose and response format unclear.","No request or response schema is available; integration requires trial-and-error."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/1","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/1","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 with clear pricing. However, there is no OpenAPI schema, no documented request/response format, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of the /api/v1/loans/1 endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/loans/1':59,174 '/docs':215 '/pricing':216 '/readme':218 '/request':17,34 '0.02':16,33,99,165 '000':94 '0x8335':84 '1':212 '20':93 '2913':85 '402':207 '6':104 'Base network API' 'USDC API' 'access':46,65,114 'across':127 'actual':235 'advertis':113,125 'ai':136 'amount':91 'analysi':140 'analyt':131 'api':44,64,107 'appear':177 'base':9,26,54,87,95 'base-network' 'broader':122 'call':4,21 'categori':129 'challeng':208 'classif':142 'collect':38 'connect':225 'contain':222 'contract':83 'convers':159 'cover':171 'crawl':197 'crypto payment API' 'data':6,23,69,130,187 'decim':105 'document':194,213,232 'embed':143 'endpoint':7,24,45,58,126,175,200 'entir':117 'equal':98 'estim':153 'exact':189 'exchang':148 'export':134 'feed':147 'financ':144,182 'finance-rel':181 'gas':152 'gate':116 'generat':160 'geocod':157 'header':75 'host':36 'howev':168 'infrastructur':155 'insight':135 'json':68 'json-response' 'key':108 'learn':138 'limit':111 'list':61,170 'live':202 'loan':5,22,186 'loan API' 'loan data endpoint' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':35,123 'machin':137 'materi':198 'maximum':90 'metric':132 'micropay':120 'network':55 'no-api-key' 'page':214 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payment':50,74,78 'per':3,20,42,100,166 'platform':124 'premium':63 'price':146,163 'prompt':227 'proper':206 'protocol':51 'provid':77 'quot':151 'rate':110,149 'relat':183 'remain':238 'report':133 'request':43,101,167 'request/response':236 'resolv':220 'resourc':184 'respons':190 'return':67,185,204 'schema':191,237 'sentiment':139 'settl':12,29,80 'sever':128 'specif':57 'substant':230 'summar':141 'technic':231 'token':150 'unit':96 'unknown':239 'usdc':14,31,82,102 'usdc-settlement' 'use':103 'util':156 'valid':72,158 'version':211 'via':10,27,47 'wallet':226 'web3':145 'x402':11,28,49,73,210 'x402 micropayment API' 'x402-payment'","prices":[{"id":"c17b9102-91e0-4c49-93c7-3e5fa00190df","listingId":"c8737f90-bc0e-49f8-8219-e1007dc7b5ae","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:28.881Z"}],"sources":[{"listingId":"c8737f90-bc0e-49f8-8219-e1007dc7b5ae","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:28.881Z","lastSeenAt":"2026-04-28T13:33:35.051Z"}],"details":{"listingId":"c8737f90-bc0e-49f8-8219-e1007dc7b5ae","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/1 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 x402 version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/loans/1"},{"claim":"All listed endpoints are priced at $0.02 per request 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/1"}],"useCases":["Fetching loan data on-demand without subscription or API key management","Agent-driven financial data retrieval with per-call USDC micropayments","Integrating loan information into Web3 applications via x402 protocol"],"bestFor":["Developers wanting keyless, pay-per-use loan data access","AI agents that can settle x402 payments on Base","Web3 applications needing low-friction financial data endpoints"],"notFor":["Users who need detailed API documentation or response schema guarantees before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.595Z"},"updatedAt":"2026-04-28T13:33:35.051Z"}}