{"id":"cf3b6417-9423-4b87-a778-8f1d0400ec8a","shortId":"jSprNL","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"This endpoint at lowpaymentfee.com/api/endpoint-39 is an x402-gated \"Premium API Access\" service settling payments in USDC on the Base network. The site advertises a broad catalog of API categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. However, this specific endpoint (/api/endpoint-39) is not listed among the documented routes on the landing page, so its exact functionality is unclear. The x402 challenge confirms it is live, accepts POST requests, and returns application/json.\n\nThe payment challenge specifies a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme with a 300-second timeout. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so there is no schema documentation, example requests/responses, or detailed descriptions of what this particular endpoint returns. The site lists many endpoints across multiple domains (sentiment analysis, summarization, geocoding, price feeds, etc.) but /api/endpoint-39 does not map to any of them. Treat this as a stub listing until more documentation becomes available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["general","api-gateway"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["Endpoint /api/endpoint-39 is not listed among the documented API routes on the landing page — its purpose is unknown.","All documentation pages (/docs, /api, /pricing, /README) are empty, showing only 'Connect wallet'.","No OpenAPI spec, input schema, or response examples are available.","Unclear whether this endpoint is a placeholder, test route, or serves a specific function."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-39","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/endpoint-39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but this specific endpoint (/api/endpoint-39) is not documented anywhere on the site. All documentation pages are empty stubs showing only 'Connect wallet'. No input/output schema, no examples, and no description of what the endpoint actually 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'/request':12,30 '0.02':11,29,82,139 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x8335':133 '20':127 '2913':134 '300':157 '6':143 'Base network API' 'USDC API' 'accept':114 'access':50 'across':222 'address':149 'advertis':62 'ai':71 'among':93 'analysi':226 'analyt':70 'api':6,16,24,34,49,67,161 'application/json':119 'attach':172 'avail':251 'base':8,26,58,129,136 'becom':250 'beyond':185 'broad':64 'call':4,22 'caller':170 'catalog':65 'categori':68 'challeng':109,122 'commit':167 'confirm':110 'connect':198 'data':69 'decim':144 'descript':210 'detail':209 'document':95,184,205,249 'domain':224 'empti':191 'endpoint':38,88,215,221 'equal':138 'essenti':190 'etc':231 'exact':103,153 'exampl':206 'feed':230 'financ':74 'function':104 'gate':47 'geocod':228 'given':140 'header':177 'howev':85 'infrastructur':77 'json-response' 'key':17,35,162 'land':99,187 'learn':73 'limit':164 'list':92,219,246 'live':113 'lowpaymentfee' 'lowpaymentfee.com':41 'lowpaymentfee.com/api/endpoint-39':40 'machin':72 'mani':220 'map':236 'maxamountrequir':125 'micropayment API' 'multipl':223 'network':59 'no-api-key' 'page':100,188,195 'particular':214 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':53,121,145,176,182 'per':3,21,83 'post':115 'post-method' 'premium':5,23,48 'premium API' 'price':80,229 'proof':183 'rate':163 'request':84,116 'requests/responses':207 'requir':18,36,169 'return':118,216 'rout':96 'schema':204 'scheme':154 'second':158 'sent':147 'sentiment':225 'servic':51 'settl':52 'show':197 'simpli':171 'site':61,218 'specif':87 'specifi':123 'stub':245 'sub':194 'sub-pag':193 'summar':227 'timeout':159 'treat':241 'unclear':106 'unit':130 'upfront':166 'usdc':14,32,55,132,141 'usdc-base' 'use':151 'util':78 'valid':180 'via':9,27 'wallet':199 'web3':75 'x':175 'x-payment':174 'x402':10,28,46,108,181 'x402 endpoint' 'x402-gated':45 'x402-payment'","prices":[{"id":"2c2b388d-6870-4c4b-9588-74b20ef6bf69","listingId":"cf3b6417-9423-4b87-a778-8f1d0400ec8a","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/endpoint-39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:29.317Z"}],"sources":[{"listingId":"cf3b6417-9423-4b87-a778-8f1d0400ec8a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:29.317Z","lastSeenAt":"2026-04-22T15:00:33.899Z"}],"details":{"listingId":"cf3b6417-9423-4b87-a778-8f1d0400ec8a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-39 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories, all at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms live 402 response with maxAmountRequired of 20000 base units of USDC on Base.","source_url":"https://lowpaymentfee.com/api/endpoint-39"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone needing a specific, well-documented capability (endpoint purpose is unclear)","Non-crypto users without Base USDC wallets"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:17:48.617Z"},"updatedAt":"2026-04-22T15:00:33.899Z"}}