{"id":"394808fa-c1c1-48e1-b4cc-86076f91d96e","shortId":"qDTDsE","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/391` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that title. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content. Because of this, the actual behavior and response format of this specific endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-gateway","payments"],"synonyms":["low payment fee API","x402 premium API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and API pages render only a 'Connect wallet' prompt with no content.","The exact functionality of /api/v1/payments/391 ('Premium API Access') is undocumented; it is unclear what data or service it provides.","No OpenAPI schema or example payloads were found.","No input schema is specified beyond accepting POST with application/json."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/391","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/391","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a title, no example requests or responses, and the docs/pricing/API pages are empty. The actual functionality of this specific endpoint is 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'/request':13,28 '0.02':12,27,81,150,198 '000':139 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':166 '0x8335':144 '20':138 '2913':145 '300':169 '6':154 'Base network API' 'USDC micropayment API' 'accept':128 'access':7,22,38,110 'actual':236 'addit':230 'address':165 'advertis':175 'ai':68 'analysi':179 'analyt':67 'api':6,21,37,64,93,109,219 'base':9,24,89,140,147 'behavior':237 'beyond':118 'broader':173 'call':4,19 'catalog':58 'challeng':123 'classif':182 'commit':100 'confirm':124 'connect':225 'content':231 'convers':190 'crawl':214 'data':66,192 'decim':155 'detail':205 'doc':216 'document':117,206 'embed':183 'endpoint':32,49,77,104,176,244 'equal':149 'exact':113,162 'exampl':208 'exchang':186 'export':193 'feed':185 'financ':71 'format':240 'found':212 'function':114 'geocod':188 'given':151 'host':56 'howev':201 'infrastructur':74 'json-response' 'key':94 'label':107 'learn':70 'limit':97 'live':127 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':158 'mani':48 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':203 'page':220 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payload':210 'payment':42,134,156 'per':3,18,62,82 'platform':54,174 'point':200 'post':129 'post-method' 'premium':5,20,36,108 'price':79,184,199,217 'prompt':227 'protocol':43 'provid':35 'rate':96,187 'remain':245 'render':222 'request':63,83,130 'request/response':209 'requir':101,132 'respons':239 'schema':204 'scheme':163 'second':170 'sentiment':178 'settl':84 'span':65 'specif':103,243 'summar':181 'text':180 'timeout':171 'titl':120 'unclear':246 'unit':141 'usdc':15,30,86,143,152 'usdc-base' 'util':75 'valid':189 'via':10,25,39,159 'wallet':226 'web3':72 'x402':11,26,41,122,161 'x402 premium API' 'x402-payment'","prices":[{"id":"065760b5-e003-4a8a-bfe2-dd291a099e5a","listingId":"394808fa-c1c1-48e1-b4cc-86076f91d96e","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/391","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:37.466Z"}],"sources":[{"listingId":"394808fa-c1c1-48e1-b4cc-86076f91d96e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/391","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:37.466Z","lastSeenAt":"2026-04-23T11:03:35.350Z"}],"details":{"listingId":"394808fa-c1c1-48e1-b4cc-86076f91d96e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/391 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/391"},{"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 APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/391"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, keyless API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Applications requiring non-crypto payment methods","High-volume use cases where per-request pricing may be inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.493Z"},"updatedAt":"2026-04-23T11:03:35.350Z"}}