{"id":"6045afa4-edb4-4cda-bda7-bbc3aed00dbf","shortId":"rkbcnX","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 on the Base network. The specific resource at `/api/v1/charges/154` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is settled on-chain with no API keys, no rate limits, and no upfront commitments required.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific endpoint `/api/v1/charges/154` is labeled only as \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages on the site are effectively empty (showing only a \"Connect wallet\" prompt). Without request/response schemas or documentation, it is unclear what payload to send or what response to expect from this particular charge endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/charges/154 is undocumented; it is unclear what data or service it provides.","No request or response schema is available; callers cannot know what payload to send or what to expect back.","The site lists many endpoint categories (AI, analytics, finance, infrastructure) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/154","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/154","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, confirming pricing and network details. However, there is no documentation, no request/response schema, and no indication of what the endpoint actually does beyond the generic label \"Premium API Access\". The docs pages are empty. This is effectively a stub 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'/request':159 '0.02':10,28,78,158 '000':67 '0x8335':72 '20':66 '2913':73 '6':83 'Base network API' 'USDC micropayment API' 'accept':59 'access':6,24,44,173 'across':115 'advertis':107 'ai':125 'analysi':129 'analyt':119 'api':5,17,23,35,43,93,172,189 'base':8,26,52,68,75 'base-network' 'broader':104 'call':80 'categori':117 'chain':90 'charg':63,223 'classif':132 'commit':101 'connect':200 'convers':149 'crypto-paid endpoint' 'data':118,122,180 'decim':84 'doc':186 'document':177,207 'effect':195 'embed':133 'empti':196 'endpoint':38,114,152,165,224 'equal':77 'estim':143 'exchang':138 'expect':219 'export':123 'feed':137 'financ':134 'four':116 'function':182 'gas':142 'gate':3,21,113 'generat':150 'geocod':147 'howev':162 'infrastructur':145 'insight':124 'key':18,36,94 'label':168 'learn':127 'limit':97 'list':154 'lowpaymentfee' 'lowpaymentfee.com':40,105 'machin':126 'metric':120 'network':53 'no-api-key' 'on-chain':88 'page':190 'particular':222 'pay':9,27 'pay-per-call API' 'pay-per-request' 'payload':212 'payment':48,85 'per':11,29,79 'platform':106 'point':161 'post':60 'post-endpoint' 'premium':4,22,42,171 'premium API access' 'price':136,160,187 'prompt':202 'protocol':49 'provid':41 'quot':141 'rate':96,139 'report':121 'request':12,30,61 'request/response':204 'requir':102 'resourc':56 'respons':217 'return':184 'schema':205 'send':214 'sentiment':128 'settl':87 'show':197 'site':193 'specif':55,164 'suit':109 'summar':131 'text':130 'token':140 'unclear':210 'unit':69 'upfront':100 'usdc':14,32,71,81 'usdc-settlement' 'use':82 'util':146 'valid':148 'via':45 'wallet':201 'web3':135 'without':203 'x402':2,20,47,112 'x402 API' 'x402-gated':1,19,111 'x402-payment'","prices":[{"id":"a25e9294-3e8a-43f2-8d55-8e6525d1d53c","listingId":"6045afa4-edb4-4cda-bda7-bbc3aed00dbf","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/154","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:19.454Z"}],"sources":[{"listingId":"6045afa4-edb4-4cda-bda7-bbc3aed00dbf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/154","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:19.454Z","lastSeenAt":"2026-04-24T05:02:31.157Z"}],"details":{"listingId":"6045afa4-edb4-4cda-bda7-bbc3aed00dbf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/154 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/154"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","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 asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/154"}],"useCases":["Programmatic access to a paid API resource without needing API keys or subscriptions","Agent-driven workflows that settle per-call payments in USDC on Base","Demonstrating x402 payment protocol integration for pay-as-you-go services"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that can settle USDC payments on Base for per-request access","Users who want zero-commitment, pay-per-use API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request crypto settlement overhead matters"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.712Z"},"updatedAt":"2026-04-24T05:02:31.157Z"}}