{"id":"ae3a0930-cb92-405a-b6e5-8dabb1a7a09c","shortId":"LxSWah","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 collection 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, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/135` 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, 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 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, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this or any endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-method","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["The exact functionality of /api/v1/payments/135 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no technical content.","No request or response schema is available; callers cannot know what to send or expect back.","The endpoint path '/api/v1/payments/135' does not match any of the advertised API categories on the homepage, suggesting it may be a generic or test endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/135","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/135","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, confirming pricing and payment details. However, the actual functionality behind \"Premium API Access\" is undocumented — no request/response schema, no examples, and all doc pages return only a wallet-connect prompt. The listing is essentially a stub with confirmed liveness and pricing but no usable technical 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'/request':13,28 '0.02':12,27,81,152,195 '000':141 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':163 '0x8335':146 '20':140 '2913':147 '300':166 '6':156 'Base network API' 'USDC micropayment API' 'accept':130 'access':7,22,38,108 'actual':217 'address':162 'advertis':172 'ai':68 'analysi':176 'analyt':67 'api':6,21,37,64,93,107 'base':9,24,89,142,149 'beyond':120 'broader':170 'call':4,19 'challeng':112,125 'classif':179 'collect':58 'commit':98 'confirm':126 'connect':207 'convers':187 'data':66,189 'decim':157 'detail':214 'doc':201 'document':119,199 'embed':180 'endpoint':32,49,77,102,173,224 'equal':151 'exact':115 'exchang':183 'export':190 'feed':182 'financ':71 'function':116 'geocod':185 'given':153 'host':56 'howev':198 'infrastructur':74 'key':94 'label':105,122 'learn':70 'limit':96 'live':129 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':160 'mani':48 'network':90 'no-api-key' 'no-rate-limit' 'offer':50 'one':46 'page':200 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,136,158 'per':3,18,62,82 'platform':54,171 'point':197 'post':131 'post-method' 'premium':5,20,36,106 'price':79,181,196,202 'prompt':209 'protocol':43 'provid':35 'rate':95,184 'readm':203 'request':63,83,132 'request/response':218 'requir':99,134 'return':204 'schema':219 'second':167 'sentiment':175 'settl':84 'span':65 'specif':101 'summar':178 'technic':213 'text':177 'timeout':168 'unit':143 'unknown':226 'usdc':15,30,86,145,154 'usdc-base' 'util':75 'valid':186 'via':10,25,39 'wallet':208 'web3':72 'x402':11,26,41,111,124 'x402 premium API' 'x402-payment'","prices":[{"id":"74d120b9-303c-4135-8916-e3b1d48db4d2","listingId":"ae3a0930-cb92-405a-b6e5-8dabb1a7a09c","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/135","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:23.313Z"}],"sources":[{"listingId":"ae3a0930-cb92-405a-b6e5-8dabb1a7a09c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/135","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:23.313Z","lastSeenAt":"2026-04-23T19:01:17.181Z"}],"details":{"listingId":"ae3a0930-cb92-405a-b6e5-8dabb1a7a09c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/135 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/135"},{"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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/payments/135"}],"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 various utility and data endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native 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":"2026-02-17T23:14:10.018Z"},"updatedAt":"2026-04-23T19:01:17.181Z"}}