{"id":"bc9178bb-7da8-4c1a-974f-41e34fed0b1e","shortId":"GPpAfj","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 platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform 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/payments/236` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to wallet `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The platform's broader catalog includes sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export endpoints — 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 additional content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint returns. The output schema in the x402 challenge only specifies that the input method is HTTP POST and that the endpoint is discoverable.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","base network api","premium api access"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The exact functionality of /api/v1/payments/236 ('Premium API Access') is undocumented and unclear","No OpenAPI schema or request/response examples provided","No information on error handling, response format, or data sources"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/236","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/236","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is virtually no documentation: no OpenAPI spec, no request/response examples, no description of what 'Premium API Access' actually returns. The docs pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'/request':13,28 '0.02':12,27,76,137,176 '000':132 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '20':131 '6':142 'USDC micropayment api' 'accept':122 'access':7,22,38,104 'addit':199 'ai':60 'analysi':156 'analyt':59 'api':6,21,37,88,103,185 'base':9,24,84,133,148 'base network api' 'beyond':112 'broader':152 'call':4,19 'catalog':153 'categori':56 'challeng':117,224 'classif':159 'commit':93 'confirm':118 'connect':194 'content':200 'convers':167 'data':58,169 'decim':143 'descript':211 'discover':239 'doc':184 'document':111,179 'embed':160 'endpoint':32,49,69,97,171,216,237 'exact':107 'exampl':208 'exchang':163 'export':170 'extrem':181 'feed':162 'financ':63 'function':108 'geocod':165 'http':232 'http-post' 'includ':57,154 'infrastructur':66 'input':229 'key':89 'label':114 'learn':62 'limit':91 'list':100 'live':121 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'method':230 'network':85 'no-api-key' 'offer':50 'one':46 'openapi':204 'output':219 'page':189 'particular':215 'pay':2,17 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request' 'payabl':79 'payment':42,127 'per':3,18,77 'platform':53,72,150 'point':178 'post':123,233 'premium':5,20,36,102 'premium api access' 'price':74,161,177,186 'prompt':196 'protocol':43 'provid':35 'rate':90,164 'readm':188 'render':191 'request':78,124 'request/response':207 'requir':94,126 'return':217 'schema':205,220 'sentiment':155 'sinc':139 'span':55 'spars':182 'specif':96 'specifi':226 'summar':158 'text':157 'unit':134 'usd':138 'usdc':15,30,81,136,140 'usdc-base-network' 'use':141 'util':67 'valid':166 'via':10,25,39 'wallet':145,195 'web3':64 'x402':11,26,41,116,223 'x402 api' 'x402-payment'","prices":[{"id":"76c9e234-a5eb-4c56-865e-468ec1675167","listingId":"bc9178bb-7da8-4c1a-974f-41e34fed0b1e","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/236","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:07.581Z"}],"sources":[{"listingId":"bc9178bb-7da8-4c1a-974f-41e34fed0b1e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/236","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:07.581Z","lastSeenAt":"2026-04-23T14:01:24.330Z"}],"details":{"listingId":"bc9178bb-7da8-4c1a-974f-41e34fed0b1e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/236 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms live endpoint accepting POST with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/236"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/236"}],"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 web services"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-network USDC wallet or x402-compatible client","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.996Z"},"updatedAt":"2026-04-23T14:01:24.330Z"}}