{"id":"e34f4dc6-c1b5-4a80-9dde-01b7a05b03c6","shortId":"8j6kRa","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/166` is labeled \"Premium API Access\" and accepts POST requests. Payment is handled inline via the x402 protocol: callers receive a 402 challenge with payment details, settle in USDC (contract 0x8335…2913 on Base), and then gain access to the response. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys, rate limits, or upfront commitments are required — access is purely pay-per-call.\n\nNote that the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality behind this specific charge endpoint is unclear. The platform lists many other endpoints (sentiment analysis, text summarization, geocoding, price feeds, etc.) but the precise capability of `/api/v1/charges/166` is not documented beyond its title. Users should verify what data or service this endpoint returns before relying on it in production.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API","402 payment API"],"warnings":["The actual functionality behind /api/v1/charges/166 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no content.","No OpenAPI schema, no response examples, and no input schema beyond 'POST with HTTP'.","Cannot verify what data or service is returned after successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/166","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/charges/166","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually returns after payment, no OpenAPI schema, no examples of successful responses, and all doc pages are empty. The specific functionality behind 'Premium API Access' at /charges/166 is entirely 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'0.02':10,28,90,159 '000':150 '0x8335':133 '20':149 '2913':134 '402':124 '402 payment API' '6':155 'Base network API' 'USDC API access' 'accept':110 'access':6,24,44,108,140,170 'actual':200 'ai':71 'amount':146 'analysi':216 'analyt':70 'api':5,17,23,35,43,66,107,161,184 'base':8,26,98,136,151 'base-network' 'behind':202 'beyond':232 'call':176 'caller':121 'capabl':226 'categori':67 'challeng':125 'charg':205 'commit':167 'connect':191 'content':197 'contract':132 'crawl':180 'data':69,239 'decim':156 'detail':128 'doc':183 'document':181,231 'endpoint':38,55,80,102,206,214,243 'equal':158 'etc':222 'feed':221 'financ':74 'function':201 'gain':139 'gate':3,21 'geocod':219 'handl':115 'host':62 'includ':68 'infrastructur':77 'inlin':116 'key':18,36,162 'label':105 'learn':73 'limit':164 'list':211 'lowpaymentfee' 'lowpaymentfee.com':40,59 'machin':72 'mani':54,212 'max':145 'micropayment API' 'model':88 'network':99 'no-api-key' 'note':177 'offer':56 'one':52 'page':182 'pay':9,27,174 'pay-per-cal':173 'pay-per-call API' 'pay-per-request' 'payment':48,113,127 'per':11,29,91,175 'platform':60,83,210 'post':111 'post-endpoint' 'precis':225 'premium':4,22,42,106 'price':87,185,220 'product':250 'prompt':193 'protocol':49,120 'provid':41 'pure':172 'rate':163 'readm':186 'receiv':122 'reli':246 'request':12,30,92,112 'requir':147,169 'respons':143 'return':188,244 'sentiment':215 'servic':241 'settl':93,129 'share':84 'specif':101,204 'substant':196 'summar':218 'text':217 'titl':234 'unclear':208 'uniform':86 'unit':152 'upfront':166 'usdc':14,32,95,131,154 'usdc-settlement' 'user':235 'util':78 'varieti':64 'verifi':237 'via':45,117 'wallet':192 'web3':75 'x402':2,20,47,119 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"f0dbf6cf-d691-4258-895e-8ae22b38ebd6","listingId":"e34f4dc6-c1b5-4a80-9dde-01b7a05b03c6","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/charges/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:28.410Z"}],"sources":[{"listingId":"e34f4dc6-c1b5-4a80-9dde-01b7a05b03c6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/166","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:28.410Z","lastSeenAt":"2026-04-24T04:03:33.189Z"}],"details":{"listingId":"e34f4dc6-c1b5-4a80-9dde-01b7a05b03c6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/166\n# Returns 402 with x402 challenge. Include X-PAYMENT header with signed USDC payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/charges/166","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/166"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/166"}],"useCases":["Accessing premium data or services without creating an account or obtaining API keys","Agent-driven workflows that need instant, keyless API access settled in USDC","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers wanting zero-friction, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","Anyone without a Base-network USDC wallet","High-volume use cases where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.336Z"},"updatedAt":"2026-04-24T04:03:33.189Z"}}