{"id":"cafece05-edeb-4623-9764-6a3df1a12606","shortId":"j2ZXgk","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 endpoint `/api/v1/transactions/66` accepts POST requests and charges 20,000 base units of USDC (USD Coin, 6 decimals) on the Base network, which equals $0.02 per request. Payment is handled inline via the X-PAYMENT header with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform offers multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request.\n\nThe specific functionality of `/api/v1/transactions/66` is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the docs pages behind the landing page only show a \"Connect wallet\" prompt with no further technical detail. The endpoint is confirmed live (returns a valid 402 challenge), but what data or service it actually returns upon successful payment is unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available beyond landing page — docs, API, pricing, and README pages all show only 'Connect wallet'","The specific functionality of /api/v1/transactions/66 is undocumented; 'Premium API Access' is a generic label","No OpenAPI schema or response examples available","Cannot verify what data or service is delivered upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/66","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/66","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, but there is no documentation on what the endpoint actually returns, no request/response schema, and the docs pages are empty beyond a wallet connect prompt. The specific purpose of /api/v1/transactions/66 is entirely 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'/request':16,34 '0.02':15,33,75,144 '000':60 '20':59 '402':197 '6':67 'Base network API' 'USDC micropayment endpoint' 'accept':54 'access':7,25,44,160 'actual':205 'ai':112 'analysi':116 'analyt':106 'api':6,24,43,90,102,159 'base':9,27,61,71 'behind':174 'beyond':155 'broader':97 'call':4,22 'categori':103 'challeng':198 'charg':58 'classif':119 'coin':66 'confirm':192 'connect':181 'convers':136 'crypto-paid API' 'data':105,109,201 'decim':68 'detail':188 'doc':172 'document':154 'embed':120 'endpoint':38,52,139,190 'equal':74 'estim':130 'exampl':169 'exchang':125 'export':110 'feed':124 'financ':121 'function':149 'gas':129 'generat':137 'generic':157 'geocod':134 'handl':80 'header':87 'includ':104 'infrastructur':132 'inlin':81 'insight':111 'key':91 'label':161 'land':176 'learn':114 'limit':94 'live':193 'lowpaymentfee' 'lowpaymentfee.com':40,98 'machin':113 'metric':107 'multipl':101 'network':10,28,72 'no-api-key' 'offer':100 'openapi':165 'page':173,177 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,78,86,209 'per':3,21,76,145 'platform':99 'post':55 'post-method' 'premium':5,23,42,158 'price':123,141 'prompt':183 'protocol':13,31,49 'provid':41 'quot':128 'rate':93,126 'report':108 'request':56,77,146 'request/response':168 'requir':95 'return':194,206 'schema':166 'sentiment':115 'servic':203 'show':179 'specif':51,148 'success':208 'summar':118 'technic':187 'text':117 'token':127 'unclear':211 'uniform':142 'unit':62 'upon':207 'usd':65 'usdc':18,36,64 'usdc-base-network' 'util':133 'valid':135,196 'via':11,29,45,82 'wallet':182 'web3':122 'x':85 'x-payment':84 'x402':12,30,47 'x402 API' 'x402-payment'","prices":[{"id":"6946e2d5-d039-40c3-9aea-3b889a29b396","listingId":"cafece05-edeb-4623-9764-6a3df1a12606","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:01.571Z"}],"sources":[{"listingId":"cafece05-edeb-4623-9764-6a3df1a12606","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:01.571Z","lastSeenAt":"2026-04-22T07:01:38.960Z"}],"details":{"listingId":"cafece05-edeb-4623-9764-6a3df1a12606","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/66 \\\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/66"},{"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 contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/66"}],"useCases":["Accessing premium data or services without API key registration","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-use endpoints into autonomous agent workflows"],"bestFor":["Developers wanting zero-signup API access with crypto payments","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 schemas before integrating","Anyone without USDC on Base network","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.259Z"},"updatedAt":"2026-04-22T07:01:38.960Z"}}