{"id":"74eba5e6-2227-4deb-9030-9d3cbfc9110b","shortId":"jTWcQ9","kind":"x402","title":"Pay-per-request premium API access on Base via x402 protocol at $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 protocol at $0.02/call 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 categories including 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.\n\nThe specific endpoint `/api/v1/transactions/307` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header with each request. The x402 challenge confirms the endpoint is live, accepts POST requests, requires up to 20,000 base units of USDC (i.e., $0.02 given 6 decimals), and responds with application/json.\n\nThe broader platform offers endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 per-call price point. Documentation beyond the landing page is minimal (other pages only show a \"Connect wallet\" prompt), so the exact request/response schemas for this specific endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","lowpaymentfee","x402 endpoint","USDC API","Base network API","pay-per-call API","micropayment API"],"warnings":["No documentation available for this specific endpoint beyond the label 'Premium API Access'","No request or response schema documented","Other pages on the site only show 'Connect wallet' with no additional content","The exact functionality of /api/v1/transactions/307 is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/307","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/307","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 and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what this specific endpoint does, no request/response schema, and no examples. The label 'Premium API Access' is generic and 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'/call':15,32 '0.02':14,31,77,149,191 '000':143 '20':142 '6':151 'Base network API' 'USDC API' 'accept':136 'access':7,24,42,95,117 'advertis':108 'ai':64 'analysi':169 'analyt':63 'api':6,23,41,94,110 'application/json':156 'attach':120 'base':9,26,85,144 'beyond':103,198 'broader':158 'call':194 'caller':118 'categori':60 'challeng':130 'classif':172 'confirm':131 'connect':209 'convers':184 'data':62,165 'decim':152 'document':102,197 'embed':173 'endpoint':36,53,73,89,133,161,220 'estim':181 'exact':98,214 'exchang':176 'export':166 'feed':175 'financ':67 'function':99 'gas':180 'generat':186 'geocod':182 'given':150 'header':124 'i.e':148 'includ':61 'infrastructur':70 'insight':167 'instant':116 'json-response' 'key':111 'label':92,105 'land':200 'learn':66 'limit':114 'live':135 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':65 'mani':52 'metric':163 'micropayment API' 'minim':203 'network':86 'no-api-key' 'no-rate-limit' 'offer':54,160 'one':50 'page':201,205 'pay':2,19 'pay-per-call API' 'pay-per-request':1,18 'payment':46,123 'per':3,20,78,193 'per-cal':192 'platform':57,107,159 'point':196 'post':137 'premium':5,22,40,93 'premium API' 'price':75,174,195 'prompt':211 'protocol':12,29,47 'provid':39 'quot':179 'rate':113,177 'report':164 'request':4,21,79,127,138 'request/response':215 'requir':139 'respond':154 'schema':216 'sentiment':168 'settl':80 'show':207 'simpli':119 'span':59 'specif':88,219 'summar':171 'text':170 'token':178 'unit':145 'unknown':222 'usdc':17,34,82,147 'usdc-base-network' 'util':71 'valid':183 'via':10,27,43 'wallet':210 'web3':68 'x402':11,28,45,122,129 'x402 endpoint' 'x402-payment'","prices":[{"id":"32fa9752-42d3-4232-bdec-7621ef96f964","listingId":"74eba5e6-2227-4deb-9030-9d3cbfc9110b","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/307","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:54.384Z"}],"sources":[{"listingId":"74eba5e6-2227-4deb-9030-9d3cbfc9110b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/307","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:54.384Z","lastSeenAt":"2026-04-22T13:31:49.692Z"}],"details":{"listingId":"74eba5e6-2227-4deb-9030-9d3cbfc9110b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/307 \\\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","source_url":"https://lowpaymentfee.com/api/v1/transactions/307"},{"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 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/307"}],"useCases":["Accessing premium data or services without API key registration","Making one-off paid API calls settled instantly on Base L2","Integrating pay-per-use endpoints into autonomous agent workflows"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation before committing","High-volume use cases where per-call pricing is cost-prohibitive compared to subscriptions","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.433Z"},"updatedAt":"2026-04-22T13:31:49.692Z"}}