{"id":"0f4e9cd1-3210-41d2-ae50-8ed3e8e48639","shortId":"esGByM","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. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/191` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, costs up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals), and pays out to address `0x1A2B...85F3` on Base. The platform's landing page lists sibling endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The actual behavior of this particular endpoint (what it returns, what input it expects) cannot be determined from the available material.","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 micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, /README all return only a wallet-connect prompt","No OpenAPI or request/response schema provided; the actual functionality of /api/v1/payments/191 is unknown","The endpoint label 'Premium API Access' is generic and does not describe what the endpoint returns","Cannot verify what data or service is delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/191","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/payments/191","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no description of what this specific endpoint actually does beyond the generic label \"Premium API Access\". Effectively a stub 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'/api/v1/payments/191':105 '/docs':205 '/pricing':207 '/readme':209 '/request':13,28 '0.02':12,27,81,145,197 '000':139 '0x1a2b':156 '20':138 '6':149 '85f3':157 'Base network API' 'USDC micropayment API' 'accept':132 'access':7,22,38,110 'actual':239 'address':155 'ai':68 'analysi':175 'analyt':67 'api':6,21,37,64,93,109 'avail':234,257 'base':9,24,89,140,159 'base-network' 'behavior':240 'beyond':122 'call':4,19 'cannot':252 'catalog':58 'challeng':114,127 'classif':178 'commit':100 'confirm':128 'connect':215 'content':221 'convers':190 'cost':135 'crawl':237 'crypto-paid endpoint' 'data':66,171 'decim':150 'determin':254 'document':121,200 'embed':179 'endpoint':32,49,77,104,167,244 'estim':187 'exact':117 'exampl':233 'exchang':182 'expect':251 'export':172 'extrem':202 'feed':181 'financ':71 'function':118 'gas':186 'generat':192 'geocod':188 'given':146 'host':56 'i.e':144 'infrastructur':74 'input':249 'insight':173 'key':94 'label':107,124 'land':163 'learn':70 'limit':97 'list':165 'live':131 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'materi':258 'metric':169 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':225 'page':164,210 'particular':243 'pay':2,17,61,152 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42 'per':3,18,62,82 'platform':54,161 'point':199 'post':133 'post-endpoint' 'premium':5,20,36,108 'premium API access' 'price':79,180,198 'prompt':217 'protocol':43 'provid':35 'quot':185 'rate':96,183 'render':212 'report':170 'request':63,83,134 'request/response':228 'requir':101 'return':247 'schema':229 'sentiment':174 'settl':84 'sibl':166 'span':65 'spars':203 'spec':226 'specif':103 'summar':177 'text':176 'token':184 'unit':141 'usag':232 'usdc':15,30,86,143,147 'usdc-settlement' 'util':75 'valid':189 'via':10,25,39 'wallet':216 'web3':72 'x402':11,26,41,113,126 'x402 API' 'x402-payment'","prices":[{"id":"94e21ab8-9aab-4a34-9b4e-d0c0e26c339a","listingId":"0f4e9cd1-3210-41d2-ae50-8ed3e8e48639","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/payments/191","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:45.621Z"}],"sources":[{"listingId":"0f4e9cd1-3210-41d2-ae50-8ed3e8e48639","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/191","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:45.621Z","lastSeenAt":"2026-04-23T16:07:16.254Z"}],"details":{"listingId":"0f4e9cd1-3210-41d2-ae50-8ed3e8e48639","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/191 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/191"},{"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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/191"},{"claim":"The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations"],"bestFor":["Developers exploring x402 pay-per-request patterns","Agents that can settle USDC payments on Base L2","Users who want keyless, commitment-free API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring known, well-documented request/response schemas","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.967Z"},"updatedAt":"2026-04-23T16:07:16.254Z"}}