{"id":"b6bba5ef-8a07-426d-9abc-6e45d2e9b8a7","shortId":"rZV3vX","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/49` 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 other endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-method","no-api-key"],"categories":["general","infrastructure"],"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/49 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation, pricing, and README pages returned only 'Connect wallet' with no technical content.","No request or response schema is available; callers cannot know what to send or what to expect back.","The endpoint path '/api/v1/payments/49' does not appear in the site's listed API catalog, suggesting it may be a special or unlisted route."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/49","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the endpoint's actual functionality is undocumented — the label 'Premium API Access' is generic, no request/response schema is provided, and all documentation pages return only a wallet-connect prompt. This is effectively a stub 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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':32,49,77,102,173,225 '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' '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 'remain':226 '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':227 '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":"e68a3592-08a9-45ad-a328-1a71f6c86039","listingId":"b6bba5ef-8a07-426d-9abc-6e45d2e9b8a7","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:38.686Z"}],"sources":[{"listingId":"b6bba5ef-8a07-426d-9abc-6e45d2e9b8a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:38.686Z","lastSeenAt":"2026-04-22T07:31:23.749Z"}],"details":{"listingId":"b6bba5ef-8a07-426d-9abc-6e45d2e9b8a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/49 \\\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 x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/payments/49"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"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 utility or 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 micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Applications requiring high-throughput, bulk-discounted API access","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.464Z"},"updatedAt":"2026-04-22T07:31:23.749Z"}}