{"id":"72bcc71d-23af-43cd-ba13-29dd71a564df","shortId":"FUdEza","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/355` 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 charges a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call on the Base network. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the response MIME type is `application/json`.\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`, `/api`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas and detailed behavior of this or any other endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["premium API","lowpaymentfee","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["The exact functionality of /api/v1/payments/355 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (/docs, /pricing, /api, /README) returned no substantive content — only a 'Connect wallet' prompt.","No request or response schema is available; integration requires trial-and-error or out-of-band documentation.","The endpoint path '/api/v1/payments/355' with a numeric ID suggests it may be a dynamically generated or ephemeral resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/355","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/355","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 402 challenge, confirming pricing and network. However, the actual functionality behind \"Premium API Access\" is entirely undocumented — no request schema, no response schema, no examples, and all documentation pages are empty stubs showing only \"Connect wallet\". The listing is effectively a stub with confirmed 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'/api/v1/payments/355':103 '/docs':199 '/pricing':200 '/readme':202 '/request':13,28 '0.02':12,27,81,140,193 '000':135 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':159 '20':134 '6':145 'Base network API' 'USDC API access' 'accept':126 'access':7,22,38,108 'actual':215 'address':158 'advertis':170 'ai':68 'analysi':174 'analyt':67 'api':6,21,37,64,93,107 'application/json':166 'base':9,24,89,136,151 'behavior':220 'beyond':116 'broader':168 'call':4,19,148 'challeng':121 'charg':130 'classif':177 'collect':58 'commit':98 'confirm':122 'connect':206 'content':212 'convers':185 'data':66,187 'decim':146 'detail':219 'document':115,197 'embed':178 'endpoint':32,49,77,102,171,226 'exact':111 'exchang':181 'export':188 'feed':180 'financ':71 'function':112 'geocod':183 'host':56 'howev':196 'infrastructur':74 'json-response' 'key':94 'label':105 'learn':70 'limit':96 'live':125 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'maximum':132 'micropayment API' 'mime':163 'network':90,152 'no-api-key' 'offer':50 'one':46 'page':198 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,154 'per':3,18,62,82,147 'platform':54,169 'point':195 'post':127 'post-method' 'premium':5,20,36,106 'premium API' 'price':79,179,194 'prompt':208 'protocol':43 'provid':35 'rate':95,182 'remain':227 'request':63,83,128 'request/response':216 'requir':99 'respons':162 'return':203 'schema':217 'sent':156 'sentiment':173 'settl':84 'sinc':142 'span':65 'specif':101 'substant':211 'summar':176 'text':175 'titl':118 'type':164 'undocu':228 'unit':137 'usd':141 'usdc':15,30,86,139,143 'usdc-base-network' 'use':144 'util':75 'valid':184 'via':10,25,39 'wallet':207 'web3':72 'x402':11,26,41,120 'x402 API' 'x402-payment'","prices":[{"id":"46ffee1f-5b76-4c3a-9a99-02a94996814b","listingId":"72bcc71d-23af-43cd-ba13-29dd71a564df","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/355","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:26.541Z"}],"sources":[{"listingId":"72bcc71d-23af-43cd-ba13-29dd71a564df","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/355","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:26.541Z","lastSeenAt":"2026-04-23T11:03:34.914Z"}],"details":{"listingId":"72bcc71d-23af-43cd-ba13-29dd71a564df","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/355 \\\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":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live on Base network with USDC payment","source_url":"https://lowpaymentfee.com/api/v1/payments/355"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/355"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","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":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Integrating pay-as-you-go API calls into agent workflows without API key management","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","Agent systems that can settle x402 payments in USDC on Base","Users who prefer no rate limits and no API key registration"],"notFor":["Users who need detailed API documentation or well-defined request/response schemas before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.066Z"},"updatedAt":"2026-04-23T11:03:34.914Z"}}