{"id":"bec0fdba-355c-499c-86c1-d6714019c5e7","shortId":"eyJ5Fn","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource at `/api/v1/charges/174` is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02 per call. The payment timeout is 300 seconds. The response MIME type is `application/json`.\n\nHowever, the specific functionality behind `/api/v1/charges/174` is not documented — the description is simply \"Premium API Access\" with no further detail on what data or service it returns. The provider's landing page lists numerous other endpoints (metrics, reports, sentiment analysis, summarization, etc.) but this particular charge ID is not among them. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually does, callers should treat it as an opaque paid resource.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific resource /api/v1/charges/174 is not listed among the provider's documented endpoints — its actual functionality is unknown.","All documentation pages (/docs, /pricing, /api, /README) returned no substantive content beyond 'Connect wallet'.","No request or response schema is available; callers cannot know what to send or what they will receive.","The provider lists many endpoints on its landing page but none match this specific charge ID."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/174","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/174","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 challenge, but the specific functionality behind /api/v1/charges/174 is completely undocumented. No OpenAPI schema, no request/response examples, and all documentation pages are empty. The listing is essentially a stub with confirmed pricing and liveness but unknown 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'/api/v1/charges/174':48,152 '/docs':200 '/pricing':201 '/readme':203 '/request':13,28 '0.02':12,27,77,132 '000':122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20':121 '300':139 '6':127 'Base network API' 'USDC micropayment endpoint' 'accept':104 'access':7,22,38,162 'actual':220 'ai':64 'among':196 'amount':118 'analysi':186 'analyt':63 'api':6,21,37,89,161 'application/json':146 'base':9,24,85,115,123 'base-network' 'behind':151 'call':4,19,134 'caller':222 'categori':60 'challeng':98 'charg':192 'commit':94 'confirm':99 'connect':208 'content':214 'contract':112 'crypto-paid API' 'data':62,169 'decim':128 'descript':157 'detail':166 'document':155,198 'endpoint':32,53,73,101,182,219 'equal':131 'etc':188 'financ':67 'function':150 'howev':147 'id':193 'includ':61 'infrastructur':70 'json-response' 'key':90 'know':216 'land':177 'learn':66 'limit':92 'list':179 'live':103 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':65 'mani':52 'max':117 'metric':183 'mime':143 'network':86 'no-api-key' 'numer':180 'offer':54 'one':50 'opaqu':228 'page':178,199 'paid':229 'particular':191 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':80 'payment':42,109,136 'per':3,18,78,133 'post':105 'premium':5,20,36,160 'premium API access' 'price':75 'prompt':210 'protocol':43 'provid':35,57,175 'rate':91 'report':184 'request':79,106 'requir':95,119 'resourc':46,230 'respons':142 'return':173,205 'second':140 'sentiment':185 'servic':171 'settl':108 'simpli':159 'span':59 'specif':45,149 'substant':213 'summar':187 'timeout':137 'treat':224 'type':144 'unit':124 'usdc':15,30,82,111,130 'usdc-settlement' 'util':71 'via':10,25,39 'wallet':209 'web3':68 'without':215 'x402':11,26,41,97 'x402 API' 'x402-payment'","prices":[{"id":"3cfa0bef-478b-4f77-9860-e95a04202f94","listingId":"bec0fdba-355c-499c-86c1-d6714019c5e7","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:17.671Z"}],"sources":[{"listingId":"bec0fdba-355c-499c-86c1-d6714019c5e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/174","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:17.671Z","lastSeenAt":"2026-04-22T13:30:57.443Z"}],"details":{"listingId":"bec0fdba-355c-499c-86c1-d6714019c5e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/174 \\\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 with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/174"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/174"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API resource without traditional API key management","Agent-driven workflows that need to pay per call using USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment flows","AI agents that can settle micropayments in USDC on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need detailed documentation on what the endpoint returns before paying","High-volume use cases where $0.02/request adds up without volume discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.806Z"},"updatedAt":"2026-04-22T13:30:57.443Z"}}