{"id":"f141025b-64c8-4661-8381-f8177ee29481","shortId":"VDTQLV","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/142` 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 (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge indicates a maxAmountRequired of 20000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the pricing advertised on the landing page.\n\nThe endpoint accepts POST requests and returns application/json responses. However, the specific functionality of `/api/v1/transactions/142` is not documented beyond the generic label \"Premium API Access.\" The platform's docs, pricing, and API pages all appear to require wallet connection and provide no additional technical documentation. Without further schema details or response examples, the exact data returned by this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-response","no-api-key","no-rate-limit"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — all doc pages require wallet connection and show no content","The specific functionality of /api/v1/transactions/142 is undocumented; 'Premium API Access' is a generic label","No request body schema or response schema provided","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/142","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/142","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 all behind a wallet-connect gate. The exact purpose of '/api/v1/transactions/142' is 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'/request':16,34 '0.02':15,33,127 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':109 '20000':117 '402 payment API' '6':122 'Base network API' 'USDC micropayment endpoint' 'accept':141 'access':7,25,44,163 'addit':181 'advertis':134 'ai':69 'analyt':68 'api':6,24,43,90,162,170 'appear':173 'application/json':146 'base':9,27,104,118 'base-network' 'beyond':157 'call':4,22 'categori':65 'challeng':112 'commit':97 'connect':177 'consist':130 'contract':108 'crypto-paid API' 'data':67,193 'decim':123 'detail':187 'doc':167 'document':156,183 'endpoint':38,52,58,140,198 'equal':126 'exact':192 'exampl':190 'financ':72 'function':151 'generic':159 'howev':148 'includ':66 'indic':113 'infrastructur':75 'json-response' 'key':91 'label':160 'land':137 'learn':71 'limit':94 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':70 'mani':57 'maxamountrequir':115 'model':87 'network':10,28,105 'no-api-key' 'no-rate-limit' 'offer':59 'one':55 'oper':79 'page':138,171 'particular':197 'pay':2,20,84 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':83 'payment':48,99 'per':3,21,85,128 'platform':62,78,165 'post':142 'premium':5,23,42,161 'price':133,168 'protocol':13,31,49 'provid':41,179 'rate':93 'remain':199 'request':86,129,143 'requir':98,175 'respons':147,189 'return':145,194 'schema':186 'settl':101 'simpl':82 'span':64 'specif':51,150 'technic':182 'unclear':200 'unit':119 'usdc':18,36,107,125 'usdc-settlement' 'use':106 'util':76 'via':11,29,45 'wallet':176 'web3':73 'without':184 'x402':12,30,47,111 'x402 API' 'x402-payment'","prices":[{"id":"7fb8f665-a500-4a7f-9427-3566bb5feecf","listingId":"f141025b-64c8-4661-8381-f8177ee29481","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/142","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:38.793Z"}],"sources":[{"listingId":"f141025b-64c8-4661-8381-f8177ee29481","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/142","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:38.793Z","lastSeenAt":"2026-04-24T22:32:56.178Z"}],"details":{"listingId":"f141025b-64c8-4661-8381-f8177ee29481","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/142 \\\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":"Platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units in USDC (6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/142"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/142"}],"useCases":["Accessing premium data or transaction information without needing API key registration","Programmatic pay-per-use API consumption settled on-chain via USDC on Base","Agent-driven workflows that need instant access without subscription overhead"],"bestFor":["Developers wanting zero-signup API access with crypto payments","AI agents that can settle x402 challenges 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 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":"2026-02-17T23:13:43.506Z"},"updatedAt":"2026-04-24T22:32:56.178Z"}}