{"id":"f6be3534-eecc-4740-8f98-497bafb05d15","shortId":"ScXg7p","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/9` 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\nHowever, the specific functionality of the `/api/v1/transactions/9` endpoint is unclear from available documentation. The endpoint title is simply \"Premium API Access\" with no further description of what data or service it returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical documentation or schema details available.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","no-rate-limits","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","wallet-gated API"],"warnings":["No documentation available for what this specific endpoint returns","No request or response schema provided","All documentation pages render only 'Connect wallet' with no technical content","The purpose of '/api/v1/transactions/9' specifically (vs other endpoints) is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/9","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns 402 challenge correctly) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what the endpoint actually returns, no request/response schema, and the specific purpose of '/api/v1/transactions/9' is undefined. The docs pages are empty beyond a wallet connect 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'/request':16,34 '0.02':15,33,75,144 '000':60 '20':59 '6':67 'Base network API' 'USDC micropayment API' 'accept':54 'access':7,25,44,167 'addit':194 'ai':112 'analysi':116 'analyt':106 'api':6,24,43,90,102,166,183 'avail':158,200 'base':9,27,61,71 'base-network' 'broader':97 'call':4,22 'categori':103 'charg':58 'classif':119 'coin':66 'connect':189 'convers':136 'crypto-paid API' 'data':105,109,174 'decim':68 'descript':171 'detail':199 'doc':180 'document':159,196 'embed':120 'endpoint':38,52,139,154,161 'equal':74 'estim':130 'exchang':125 'export':110 'feed':124 'financ':121 'function':150 'gas':129 'generat':137 'geocod':134 'handl':80 'header':87 'howev':147 'includ':104 'infrastructur':132 'inlin':81 'insight':111 'json-response' 'key':91 'learn':114 'limit':94 'lowpaymentfee' 'lowpaymentfee.com':40,98 'machin':113 'metric':107 'multipl':101 'network':10,28,72 'no-api-key' 'no-rate-limits' 'offer':100 'page':184 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,78,86 'per':3,21,76,145 'platform':99 'post':55 'premium':5,23,42,165 'price':123,141,181 'prompt':191 'protocol':13,31,49 'provid':41 'quot':128 'rate':93,126 'render':186 'report':108 'request':56,77,146 'requir':95 'return':178 'schema':198 'sentiment':115 'servic':176 'simpli':164 'specif':51,149 'summar':118 'technic':195 'text':117 'titl':162 'token':127 'unclear':156 'uniform':142 'unit':62 'usd':65 'usdc':18,36,64 'usdc-settlement' 'util':133 'valid':135 'via':11,29,45,82 'wallet':190 'wallet-gated API' 'web3':122 'x':85 'x-payment':84 'x402':12,30,47 'x402 API' 'x402-payment'","prices":[{"id":"e8b5a204-7a19-4af7-9f18-0efa810c3894","listingId":"f6be3534-eecc-4740-8f98-497bafb05d15","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:08.828Z"}],"sources":[{"listingId":"f6be3534-eecc-4740-8f98-497bafb05d15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:08.828Z","lastSeenAt":"2026-04-22T07:01:39.259Z"}],"details":{"listingId":"f6be3534-eecc-4740-8f98-497bafb05d15","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/9 \\\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/9"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/9"}],"useCases":["Accessing premium API services without traditional API key registration","Making one-off API calls with instant USDC micropayments on Base","Programmatic agent-to-service payments without subscriptions"],"bestFor":["Developers wanting keyless pay-per-use API access","AI agents that can settle payments via x402 protocol","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation before purchasing","High-volume use cases where subscription pricing would be cheaper","Users without Base network USDC wallets"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.914Z"},"updatedAt":"2026-04-22T07:01:39.259Z"}}