{"id":"092cb185-ecfe-47f7-8342-a97f8f9d84db","shortId":"ADzbpr","kind":"x402","title":"Pay-per-call premium API access on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API access on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It 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 specific endpoint `/api/v1/charges/56` returned a live 402 challenge advertising an exact-scheme payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The x402 version is 1, with a maximum timeout of 300 seconds. The output schema indicates it accepts HTTP POST requests and is discoverable.\n\nHowever, the specific functionality behind `/api/v1/charges/56` is not documented beyond the generic label \"Premium API Access.\" The provider's landing page lists numerous other endpoints (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, etc.) but this particular charge ID does not map clearly to any of them. Documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation or example responses, the exact data or service returned by this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The exact service provided by /api/v1/charges/56 is unknown — 'Premium API Access' is a generic label with no further documentation.","All documentation pages (/docs, /api, /pricing, /README) returned no substantive content, only a 'Connect wallet' prompt.","No OpenAPI spec, no request/response examples, and no schema beyond the x402 challenge outputSchema.","This endpoint's charge ID (56) does not correspond to any named endpoint on the provider's landing page."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/56","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/56","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/56 is undocumented. No OpenAPI schema, no example requests/responses, and all doc pages return only 'Connect wallet' with no content. The listing is effectively a stub with pricing info 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'/api/v1/charges/56':99,157 '/docs':205 '/pricing':207 '/readme':208 '/request':17,34 '0.02':16,33,77,124 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':127 '0x8335':118 '1':132 '20':112 '2913':119 '300':138 '402':103 '6':122 'Base network API' 'USDC micropayment API' 'accept':145 'access':7,24,42,167 'address':126 'advertis':105 'ai':64 'analysi':180 'analyt':63 'api':6,23,41,89,166 'base':9,26,85,114,121 'base-network' 'behind':156 'beyond':161 'call':4,21 'categori':60 'challeng':104 'charg':193 'classif':182 'clear':198 'commit':94 'connect':213 'content':219 'crypto-paid API' 'data':62,228 'decim':123 'discover':151 'document':160,203,222 'embed':183 'endpoint':36,53,73,98,176,234 'etc':189 'exact':108,227 'exact-schem':107 'exampl':224 'exchang':186 'feed':185 'financ':67 'function':155 'generic':163 'geocod':188 'howev':152 'http':146 'http-post' 'id':194 'includ':61 'indic':143 'infrastructur':70 'key':90 'label':164 'land':171 'learn':66 'limit':92 'list':173 'live':102 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':65 'mani':52 'map':197 'maximum':135 'metric':177 'network':86 'no-api-key' 'numer':174 'offer':54 'one':50 'output':141 'page':172,204 'particular':192 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payabl':80 'payment':46,110 'per':3,20,78 'post':147 'premium':5,22,40,165 'premium API access' 'price':75,184 'prompt':215 'protocol':47 'provid':39,57,169 'rate':91,187 'remain':235 'report':178 'request':79,148 'requir':95 'respons':225 'return':100,210,231 'schema':142 'scheme':109 'second':139 'sentiment':179 'servic':230 'settl':12,29 'span':59 'specif':97,154 'substant':218 'summar':181 'timeout':136 'unclear':236 'unit':115 'usdc':14,31,82,117 'usdc-settlement' 'util':71 'version':130 'via':10,27,43 'wallet':214 'web3':68 'without':220 'x402':11,28,45,129 'x402 API' 'x402-payment'","prices":[{"id":"9946833a-ee11-488b-bb90-93f5dad05267","listingId":"092cb185-ecfe-47f7-8342-a97f8f9d84db","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:42.252Z"}],"sources":[{"listingId":"092cb185-ecfe-47f7-8342-a97f8f9d84db","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:42.252Z","lastSeenAt":"2026-04-23T21:32:04.556Z"}],"details":{"listingId":"092cb185-ecfe-47f7-8342-a97f8f9d84db","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/56 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a live 402 challenge with x402Version 1, exact scheme, 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/56"},{"claim":"Provider lists endpoints 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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/charges/56"}],"useCases":["Accessing paid API services without traditional API key registration","Making one-off API calls settled instantly in USDC on Base","Agent-driven programmatic access to premium data or services via x402"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.765Z"},"updatedAt":"2026-04-23T21:32:04.556Z"}}