{"id":"337219fe-0b81-4d5e-befd-dab341e34206","shortId":"SYNeRE","kind":"x402","title":"x402-gated loan data endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated loan data endpoint on Base, pay-per-request with USDC.","description":"This endpoint at `/api/v1/loans/11` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML, finance, infrastructure, and more. The specific endpoint appears to serve loan-related data (resource ID 11), though the exact response schema is not documented. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 exact payment scheme.\n\nThe x402 challenge indicates a maximum amount of 20,000 base units of USDC. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The landing page lists many endpoint categories but provides no request/response schemas, parameter descriptions, or example payloads. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no substantive content. The specific `/api/v1/loans/11` endpoint is not listed on the homepage's API catalog, making its purpose and output format unclear. It accepts POST requests based on the outputSchema in the x402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","loan-data","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["loan API","loan data endpoint","x402 loan","pay-per-call loan info","USDC micropayment API","lowpaymentfee loans","Base network API"],"warnings":["The /api/v1/loans/11 endpoint is not listed in the provider's public API catalog — its purpose and data format are unknown.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no substantive content.","No request parameters or response schema are documented anywhere.","The broader lowpaymentfee.com platform lists many endpoint categories but none appear to have detailed docs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/11","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base), but there is no documentation for this specific endpoint, no request/response schema, no examples, and the endpoint isn't even listed on the provider's homepage catalog. Effectively a stub 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'/api/v1/loans/11':32,203 '/docs':184 '/pricing':186 '/readme':188 '/request':132 '0.02':119,131 '000':106 '0x8335':89 '11':70 '20':105 '2913':90 '6':114 'Base network API' 'USDC micropayment API' 'accept':222 'access':147 'across':133 'advertis':127,138 'ai/ml':53 'amount':103 'analyt':52 'api':49,140,212 'appear':61 'attach':150 'base':8,22,84,107,225 'base-network' 'caller':148 'catalog':213 'categori':172 'challeng':99,232 'collect':40 'connect':194 'consist':122 'content':200 'contract':88 'data':5,19,51,67 'decim':115 'descript':179 'document':78,162 'endpoint':6,20,30,60,135,171,204 'exact':73,94 'exampl':181 'extrem':164 'financ':54 'flat':128 'format':219 'gate':3,17 'header':155 'homepag':210 'id':69 'indic':100 'infrastructur':55 'instant':146 'json-response' 'key':141 'land':167 'limit':144 'list':169,207 'loan':4,18,65 'loan API' 'loan data endpoint' 'loan-data' 'loan-rel':64 'lowpaymentfee loans' 'lowpaymentfee.com':37 'make':214 'mani':170 'maximum':102 'network':85 'output':218 'outputschema':228 'page':168,189 'paramet':178 'part':34 'pay':10,24,46 'pay-per-call loan info' 'pay-per-request':9,23,45 'payload':182 'payment':79,95,154,160 'per':11,25,47,120 'platform':38,137 'post':223 'post-endpoint' 'price':129 'prompt':196 'proof':161 'protocol':44 'provid':174 'purpos':216 'rate':143 'relat':66 'render':191 'request':12,26,48,121,224 'request/response':176 'resourc':68 'respons':74 'schema':75,177 'scheme':96 'serv':63 'settl':81 'simpli':149 'sinc':111 'site':125 'span':50 'spars':165 'specif':59,202 'substant':199 'though':71 'translat':117 'unclear':220 'unit':108 'usdc':14,28,87,110,112 'usdc-settlement' 'use':86,113 'valid':158 'via':91 'wallet':195 'x':153 'x-payment':152 'x402':2,16,43,93,98,159,231 'x402 loan' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"eaa9d81e-df17-43a6-beed-20b260a73367","listingId":"337219fe-0b81-4d5e-befd-dab341e34206","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:21.581Z"}],"sources":[{"listingId":"337219fe-0b81-4d5e-befd-dab341e34206","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:21.581Z","lastSeenAt":"2026-04-28T15:06:02.368Z"}],"details":{"listingId":"337219fe-0b81-4d5e-befd-dab341e34206","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/11 \\\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 x402 challenge specifies maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/11"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/11"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving loan-related data on a per-request payment basis","Integrating pay-per-call financial data into agent workflows","Accessing loan information without API key registration"],"bestFor":["Agents needing on-demand loan data without subscription commitments","Developers experimenting with x402 payment protocol integrations","Low-volume consumers who prefer per-request pricing"],"notFor":["High-volume loan data consumers who need bulk pricing or streaming","Users who need detailed API documentation and response schemas before integrating","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.937Z"},"updatedAt":"2026-04-28T15:06:02.368Z"}}