{"id":"21288b84-bb69-42fd-81fa-34b7ac067098","shortId":"evRL6S","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $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 data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/transactions/344` is listed under the \"Premium API Access\" description. The platform does not provide detailed documentation about what this particular transaction endpoint returns — the docs, pricing, and API pages all appear to require a wallet connection to view content. The x402 challenge confirms the endpoint is live, accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given 6 decimals), and settles on the Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\n\nThe platform advertises instant access with no minimums and no commitments. However, the actual response payload and input schema for this specific endpoint are undocumented in the crawled material, making it unclear what data or service is returned upon successful payment.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available for this specific endpoint's request/response schema","Docs, pricing, and API pages require wallet connection and show no useful content when crawled","The purpose of '/api/v1/transactions/344' is unclear — 'Premium API Access' is a generic label","Cannot verify what data or service is delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/344","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/transactions/344","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 402 challenge with clear pricing ($0.02 USDC on Base), but there is no documentation on what the endpoint actually returns, no input/output schema beyond the basic x402 challenge metadata, and the docs pages are inaccessible without a wallet 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'/request':16,34 '0.02':15,33,78,163 '000':157 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':175 '20':156 '402 payment API' '6':165 'Base network API' 'USDC micropayment endpoint' 'accept':149 'access':7,25,44,109,180 'actual':189 'address':174 'advertis':178 'ai':64 'analyt':63 'api':6,24,43,90,108,129 'appear':132 'base':9,27,86,158,171 'call':4,22 'categori':72 'challeng':143 'charg':152 'commit':97,186 'confirm':144 'connect':137 'content':140 'crawl':203 'crypto-paid API' 'data':62,209 'decim':166 'descript':110 'detail':116 'doc':126 'document':117 'endpoint':38,55,74,101,123,146,198 'financ':67 'given':164 'howev':187 'i.e':162 'infrastructur':70 'input':193 'instant':179 'json-response' 'key':91 'learn':66 'limit':94 'list':104 'live':148 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':65 'make':205 'mani':54 'materi':204 'maximum':154 'minimum':183 'network':10,28,87,172 'no-api-key' 'offer':56 'one':52 'page':130 'particular':121 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payabl':81 'payload':191 'payment':48,216 'per':3,21,79 'platform':59,112,177 'post':150 'post-method' 'premium':5,23,42,107 'price':76,127 'protocol':13,31,49 'provid':41,115 'rate':93 'request':80,151 'requir':98,134 'respons':190 'return':124,213 'schema':194 'servic':211 'settl':168 'span':61 'specif':100,197 'success':215 'transact':122 'unclear':207 'undocu':200 'unit':159 'upon':214 'usdc':18,36,83,161 'usdc-base-network' 'util':71 'via':11,29,45 'view':139 'wallet':136 'web3':68 'x402':12,30,47,142 'x402 API' 'x402-payment'","prices":[{"id":"334e5ccd-da97-4b8f-9281-1465a13cc152","listingId":"21288b84-bb69-42fd-81fa-34b7ac067098","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/transactions/344","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:20.480Z"}],"sources":[{"listingId":"21288b84-bb69-42fd-81fa-34b7ac067098","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/344","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:20.480Z","lastSeenAt":"2026-04-24T07:32:36.741Z"}],"details":{"listingId":"21288b84-bb69-42fd-81fa-34b7ac067098","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/344 \\\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 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/344"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/344"}],"useCases":["Programmatic access to premium data or transaction information without subscription","Agent-driven API consumption with per-call USDC micropayments","Accessing financial or utility services without API key registration"],"bestFor":["Developers wanting zero-friction pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation before purchasing","High-volume consumers who want bulk pricing or subscriptions","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.19Z"},"updatedAt":"2026-04-24T07:32:36.741Z"}}