{"id":"75f0ade3-b82c-4494-92f9-fa56d6e23f7f","shortId":"5QmAP5","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. The specific path `/api/v1/transactions/350` is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.\n\nThe platform operates on a simple pay-per-request model with no API keys, no rate limits, and no commitments required. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request. The x402 challenge confirms the endpoint is live and accepts POST requests with payment via the \"exact\" scheme.\n\nWhile the landing page lists numerous endpoints across different domains (sentiment analysis, text summarization, geocoding, price feeds, etc.), the specific functionality of `/api/v1/transactions/350` is not clearly documented. The endpoint description is simply \"Premium API Access\" with no further detail on what data or service it returns. Documentation pages (docs, pricing, README) all resolve to minimal \"Connect wallet\" content, providing no additional technical specification or response schema information.","tags":[],"capabilities":["x402-payment","pay-per-request","base-network","usdc-settlement","no-api-key","no-rate-limit","http-post"],"categories":["infrastructure","finance"],"synonyms":["x402 API","pay-per-call API","crypto-paid API","Base USDC API","micropayment API","lowpaymentfee","transactions endpoint"],"warnings":["No documentation available for this specific endpoint's functionality or response format","All doc/pricing/README pages return only 'Connect wallet' with no useful content","The purpose of /api/v1/transactions/350 is not explained anywhere in the crawled material","Cannot verify what service or data this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/350","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/350","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what this specific endpoint returns, no request/response schema, and the docs pages are empty. The purpose of '/api/v1/transactions/350' is entirely 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'/request':16,34 '0.02':15,33,114 'Base USDC API' 'accept':126 'access':7,25,44,169 'across':142 'addit':195 'ai':69 'analysi':146 'analyt':68 'api':6,24,43,90,168 'base':9,27,104 'base-network' 'call':4,22 'categori':65 'challeng':119 'clear':160 'coin':109 'commit':97 'confirm':120 'connect':190 'content':192 'cost':112 'crypto-paid API' 'data':67,176 'descript':164 'detail':173 'differ':143 'doc':183 'document':161,181 'domain':144 'endpoint':38,58,122,141,163 'etc':152 'exact':133 'feed':151 'financ':72 'function':155 'geocod':149 'http-post' 'includ':66 'inform':201 'infrastructur':75 'key':91 'land':137 'learn':71 'limit':94 'list':139 'live':124 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':70 'mani':57 'micropayment API' 'minim':189 'model':87 'network':10,28,105 'no-api-key' 'no-rate-limit' 'numer':140 'offer':59 'one':55 'oper':79 'page':138,182 'path':52 'pay':2,20,84 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':83 'payment':48,99,130 'per':3,21,85,115 'platform':62,78 'post':127 'premium':5,23,42,167 'price':150,184 'protocol':13,31,49 'provid':41,193 'rate':93 'readm':185 'request':86,116,128 'requir':98 'resolv':187 'respons':199 'return':180 'schema':200 'scheme':134 'sentiment':145 'servic':178 'settl':101 'simpl':82 'simpli':166 'span':64 'specif':51,154,197 'summar':148 'technic':196 'text':147 'transactions endpoint' 'usd':108 'usdc':18,36,107 'usdc-settlement' 'use':106 'util':76 'via':11,29,45,131 'wallet':191 'web3':73 'x402':12,30,47,118 'x402 API' 'x402-payment'","prices":[{"id":"7bf6c6bd-75d7-4e93-975f-38beb38a1bdd","listingId":"75f0ade3-b82c-4494-92f9-fa56d6e23f7f","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/350","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:13.767Z"}],"sources":[{"listingId":"75f0ade3-b82c-4494-92f9-fa56d6e23f7f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/350","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:13.767Z","lastSeenAt":"2026-04-24T07:32:36.544Z"}],"details":{"listingId":"75f0ade3-b82c-4494-92f9-fa56d6e23f7f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/350 \\\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 challenge with maxAmountRequired of 20000 base units (USDC, 6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/350"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/350"}],"useCases":["Accessing premium data or services without traditional API key registration","Making one-off API calls with instant crypto payment on Base","Integrating pay-per-use endpoints into agent workflows without subscription overhead"],"bestFor":["Developers wanting frictionless API access without signup","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go over subscription models"],"notFor":["Users who need detailed API documentation and response schemas before integrating","High-volume use cases where per-request pricing may add up compared to flat-rate plans","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.413Z"},"updatedAt":"2026-04-24T07:32:36.544Z"}}