{"id":"4ce1a3a3-8b01-4f88-9243-df959202431f","shortId":"nBYesx","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-call APIs across data & analytics, AI/ML, finance/Web3, and infrastructure categories. The specific endpoint `/api/v1/collections/43` is listed as \"Premium API Access\" and is gated via the x402 protocol, accepting USDC payments on the Base network.\n\nThe x402 challenge confirms the endpoint is live and requires a maximum of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) per request. Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or account registration are required.\n\nHowever, the actual functionality behind this specific `/collections/43` endpoint is unclear. The site lists many endpoints across categories (analytics, AI, finance, utilities), but none of them map directly to the `/api/v1/collections/43` path. The description is simply \"Premium API Access\" with no further documentation. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. Without knowing what data or service this endpoint returns, agents should treat this as an opaque paid endpoint with uncertain output.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["api","infrastructure"],"synonyms":["lowpaymentfee","x402 api","paid api endpoint","USDC api","Base network api","micropayment api","pay-per-call"],"warnings":["The specific functionality of /api/v1/collections/43 is undocumented — it is unclear what data or service it provides.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, no request/response schema, and no examples are available.","The endpoint path does not match any of the named endpoints listed on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/43","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/collections/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the actual functionality of /api/v1/collections/43 is completely undocumented. The docs pages are empty beyond a wallet-connect 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'/collections/43':161 '/request':131 '0.02':10,29,118,130 '000':101 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':107 '20':100 '300':143 '6':113 'Base network api' 'USDC api' 'accept':80 'access':6,25,72,192 'account':150 'across':55,132,170 'actual':156 'address':139 'advertis':126 'agent':224 'ai':173 'ai/ml':58 'analyt':57,172 'api':5,24,54,71,147,191,200 'asset':106 'base':8,27,85,102 'behind':158 'broader':47 'call':53,120 'categori':62,171 'challeng':89 'confirm':90 'connect':208 'consist':121 'content':214 'data':56,218 'decim':114 'descript':187 'direct':181 'doc':198 'document':196 'endpoint':40,65,92,134,162,169,222,232 'financ':174 'finance/web3':59 'flat':127 'function':157 'gate':3,22,75 'howev':154 'infrastructur':61 'json-response' 'key':16,35,148 'know':216 'limit':19,38 'list':68,167 'live':94 'lowpaymentfee' 'lowpaymentfee.com':42 'mani':168 'map':180 'maximum':98 'micropayment api' 'network':86 'no-api-key' 'none':177 'offer':49 'opaqu':230 'output':235 'page':203 'paid':231 'paid api endpoint' 'part':44 'path':185 'pay':9,28,51 'pay-per-cal':50 'pay-per-call' 'pay-per-request' 'payment':82,135 'per':11,30,52,108,119 'platform':48 'premium':4,23,70,190 'price':128,199 'prompt':210 'protocol':79 'rate':18,37 'readm':202 'registr':151 'render':205 'request':12,31,109 'requir':96,153 'return':223 'second':144 'sent':137 'servic':220 'simpli':189 'sinc':110 'site':124,166 'specif':64,160 'substant':213 'timeout':145 'translat':116 'treat':226 'uncertain':234 'unclear':164 'unit':103 'usdc':14,33,81,105,111 'usdc-base' 'use':112 'util':175 'via':76 'wallet':209 'without':215 'x402':2,21,78,88 'x402 api' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"39012de8-605b-43c4-b282-00fba2d313a7","listingId":"4ce1a3a3-8b01-4f88-9243-df959202431f","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/collections/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:48.180Z"}],"sources":[{"listingId":"4ce1a3a3-8b01-4f88-9243-df959202431f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:48.180Z","lastSeenAt":"2026-04-22T01:02:00.256Z"}],"details":{"listingId":"4ce1a3a3-8b01-4f88-9243-df959202431f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/43 \\\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 x402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/collections/43"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/43"},{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API resource with per-call USDC micropayments on Base","Integrating x402-gated endpoints into agent workflows without API key management","Testing x402 protocol 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 keyless, pay-as-you-go API access"],"notFor":["Users who need clear documentation of what the endpoint returns before paying","High-volume use cases where per-call pricing may add up without volume discounts","Users without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.672Z"},"updatedAt":"2026-04-22T01:02:00.256Z"}}