{"id":"7d61d3e9-9dc5-46ec-80cf-0622c135f579","shortId":"ww3Bzm","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific path `/api/v1/transactions/120` is one of many endpoints offered by this provider, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.\n\nThe provider advertises a flat $0.02 per request pricing model with no API keys, no rate limits, and instant access. Payment is settled in USDC (USD Coin) on Base. The x402 challenge confirms the endpoint is live, accepting POST requests with a maximum amount of 20,000 base units of USDC (which equals $0.02 given USDC's 6 decimals). The payment timeout is 300 seconds.\n\nWhile the landing page lists numerous endpoints across analytics, AI/ML, finance, and utility categories, the specific functionality of `/api/v1/transactions/120` is not documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, detailed documentation, or example responses were available from the crawled pages (docs, pricing, and API pages all returned only a \"Connect wallet\" prompt). The actual data returned by this specific transaction endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","transaction API"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet'","The specific functionality of /api/v1/transactions/120 is not described anywhere in crawled content","No OpenAPI schema or response examples available","Cannot verify what data or service this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/120","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/120","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, no OpenAPI schema, no example requests/responses, and the specific functionality of this endpoint path is undocumented. The docs/pricing/API pages are all gated behind wallet connection with no useful 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'/request':13,28 '0.02':12,27,80,128 '000':121 '20':120 '300':138 '6':132 'Base network API' 'USDC micropayment endpoint' 'accept':112 'access':7,22,38,94,167 'across':147 'actual':196 'advertis':77 'ai':67 'ai/ml':149 'amount':118 'analyt':66,148 'api':6,21,37,87,166,186 'avail':178 'base':9,24,46,103,122 'base-network' 'beyond':162 'call':4,19 'categori':63,153 'challeng':106 'coin':101 'confirm':107 'connect':192 'crawl':181 'crypto-paid API' 'data':65,197 'decim':133 'detail':172 'doc':183 'document':161,173 'endpoint':32,56,109,146,203 'equal':127 'exampl':175 'financ':70,150 'flat':79 'function':156 'generic':164 'given':129 'includ':64 'infrastructur':73 'instant':93 'key':88 'label':168 'land':142 'learn':69 'limit':91 'list':144 'live':111 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'mani':55 'maximum':117 'model':84 'network':47 'no-api-key' 'numer':145 'offer':57 'one':53 'openapi':170 'page':143,182,187 'path':50 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,95,135 'per':3,18,81 'post':113 'post-method' 'premium':5,20,36,165 'price':83,184 'prompt':194 'protocol':43 'provid':35,60,76 'rate':90 'remain':204 'request':82,114 'respons':176 'return':189,198 'schema':171 'second':139 'settl':97 'span':62 'specif':49,155,201 'timeout':136 'transact':202 'transaction API' 'unclear':205 'unit':123 'usd':100 'usdc':15,30,99,125,130 'usdc-settlement' 'util':74,152 'via':10,25,39 'wallet':193 'web3':71 'x402':11,26,41,105 'x402 API' 'x402-payment'","prices":[{"id":"e3ce7898-0c62-43df-95d9-7b52e6d6ed4c","listingId":"7d61d3e9-9dc5-46ec-80cf-0622c135f579","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/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:24.975Z"}],"sources":[{"listingId":"7d61d3e9-9dc5-46ec-80cf-0622c135f579","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/120","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:24.975Z","lastSeenAt":"2026-04-26T02:03:13.065Z"}],"details":{"listingId":"7d61d3e9-9dc5-46ec-80cf-0622c135f579","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/120 \\\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 accepting USDC on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/transactions/120"},{"claim":"Provider 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/120"}],"useCases":["Accessing premium data or transaction information without traditional API key registration","Agent-driven workflows that need instant, permissionless API access via crypto micropayments","Programmatic access to services where per-call billing is preferred over subscriptions"],"bestFor":["Developers wanting no-signup, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users who prefer USDC micropayments on Base over traditional billing"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.168Z"},"updatedAt":"2026-04-26T02:03:13.065Z"}}