{"id":"dedb098f-5e37-46cf-a7de-9f265a67ed07","shortId":"s9CDQW","kind":"x402","title":"x402-gated loan data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated loan data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific loan resource (loan ID 57) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/loans/57` is labeled \"Premium API Access\" in the x402 challenge. The challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are required — access is granted purely through per-call USDC payment.\n\nDocumentation on the site is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the loan data response looks like. The endpoint path suggests it returns data about a specific loan (ID 57), but the exact fields and structure are unknown. The platform appears to be a demonstration or early-stage x402 API marketplace.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","loan-data","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["loan API","x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","loan data endpoint"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The endpoint path /api/v1/loans/57 is not listed on the site's homepage API catalog — it may be a test or unlisted resource","Response format and fields are completely unknown","The broader platform appears to be early-stage or a demonstration site"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/57","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/57","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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty. The purpose of the specific /loans/57 endpoint is unclear beyond its label. This is effectively a stub 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'0.02':10,24,118 '000':107 '0x8335':112 '20':106 '2913':113 '300':135 '57':42,213 '6':123 'Base network API' 'USDC pay-per-call' 'access':34,94,146 'advertis':101 'ai/ml':68 'amount':104 'analyt':67 'api':64,93,139,165,234 'appear':224 'base':8,22,82,108,115 'base-network' 'behind':77 'broader':53 'call':153 'challeng':98,100 'connect':174 'content':180 'data':5,19,66,71,197,207 'decim':124 'demonstr':228 'doc':164 'document':156,189 'earli':231 'early-stag':230 'endpoint':6,20,30,88,202 'equal':117 'exact':131,216 'exampl':192 'extrem':161 'field':217 'finance/web3':70 'gate':3,17,76 'grant':148 'id':41,212 'infer':69 'infrastructur':73 'key':140 'label':91 'like':200 'limit':143 'loan':4,18,38,40,196,211 'loan API' 'loan data endpoint' 'loan-data' 'look':199 'lowpaymentfee' 'lowpaymentfee.com':32 'made':127 'marketplac':235 'maximum':103 'micropay':79 'micropayment API' 'network':83 'no-api-key' 'offer':56 'openapi':184 'page':169 'part':50 'path':203 'pay':9,23,61 'pay-per-request':60 'payment':46,125,155 'per':11,25,62,119,152 'per-cal':151 'platform':54,223 'premium':92 'price':166 'prompt':176 'protocol':47 'provid':33 'pure':149 'rate':142 'readm':168 'render':171 'request':12,26,63,120 'request/response':187 'requir':145 'resourc':39 'respons':198 'return':206 'schema':188 'scheme':132 'second':136 'site':159 'span':65 'spars':162 'spec':185 'specif':37,87,210 'stage':232 'structur':219 'substant':179 'suggest':204 'timeout':137 'unit':109 'unknown':221 'usdc':14,28,85,111,121,154 'usdc-micropayment' 'use':84,122 'util':74 'varieti':58 'via':43,128 'wallet':175 'x402':2,16,45,78,97,130,233 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1f772a61-d65a-40b3-bd02-8f43a60fe0f0","listingId":"dedb098f-5e37-46cf-a7de-9f265a67ed07","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:42.743Z"}],"sources":[{"listingId":"dedb098f-5e37-46cf-a7de-9f265a67ed07","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:42.743Z","lastSeenAt":"2026-04-28T11:33:36.107Z"}],"details":{"listingId":"dedb098f-5e37-46cf-a7de-9f265a67ed07","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/57 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/loans/57"},{"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 address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/57"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving loan data for a specific loan record via micropayment","Demonstrating x402 payment protocol integration on Base","Programmatic access to financial loan information without API key management"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need on-demand loan data without subscription commitments","Testing pay-per-request API patterns on Base L2"],"notFor":["Production use requiring documented response schemas and SLAs","Bulk loan data retrieval where per-request pricing is inefficient","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.852Z"},"updatedAt":"2026-04-28T11:33:36.107Z"}}