{"id":"b3f9c725-1a0a-447d-b406-dcaea928479f","shortId":"zfaRHk","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. 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, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/transactions/141` is listed under the generic \"Premium API Access\" label. The x402 challenge confirms it accepts POST requests, settles in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, and requires a maximum payment of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what this particular transactions endpoint actually returns. The platform advertises a broad suite of endpoints but provides minimal documentation for any of them.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","transaction API"],"warnings":["No documentation available — docs/pricing/README pages only show 'Connect wallet'","No OpenAPI or request/response schema provided","The specific function of /api/v1/transactions/141 is unknown — 'Premium API Access' is a generic label","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/141","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/141","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually does beyond the generic label 'Premium API Access'. This is effectively a stub 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'/request':16,34 '0.02':15,33,79,139 '000':135 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':125 '20':134 '300':154 '6':143 'Base network API' 'USDC micropayment API' 'accept':118 'access':7,25,44,111 'actual':197 'address':150 'advertis':201 'ai':66 'analyt':65 'api':6,24,43,91,110,163 'base':9,27,87,127,136 'base-network' 'broad':203 'call':4,22 'categori':62 'challeng':115 'commit':98 'confirm':116 'connect':172 'contract':124 'data':64 'decim':144 'descript':190 'detail':179 'direct':148 'doc':162 'document':157,210 'endpoint':38,55,75,102,196,206 'exampl':187 'extrem':159 'financ':69 'generic':108 'given':140 'i.e':138 'includ':63 'infrastructur':72 'key':92 'label':112 'learn':68 'limit':95 'list':105 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':67 'mani':54 'maximum':131 'minim':209 'network':10,28,88 'no-api-key' 'offer':56 'one':52 'openapi':183 'page':167 'paid':82 'particular':194 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,132,146 'per':3,21,80 'platform':59,200 'post':119 'post-method' 'premium':5,23,42,109 'premium API' 'price':77,164 'prompt':174 'protocol':13,31,49 'provid':41,208 'rate':94 'readm':166 'render':169 'request':81,120 'request/response':186 'requir':99,129 'return':198 'schema':184 'second':155 'settl':121 'span':61 'spars':160 'specif':101 'suit':204 'technic':178 'timeout':156 'transact':195 'transaction API' 'unit':137 'usdc':18,36,84,123,141 'usdc-settlement' 'util':73 'via':11,29,45 'wallet':173 'web3':70 'x402':12,30,47,114 'x402 endpoint' 'x402-payment'","prices":[{"id":"4978dd78-b381-4d26-b779-ea6ebb02d5fa","listingId":"b3f9c725-1a0a-447d-b406-dcaea928479f","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/141","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:35.747Z"}],"sources":[{"listingId":"b3f9c725-1a0a-447d-b406-dcaea928479f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/141","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:35.747Z","lastSeenAt":"2026-04-25T00:05:09.822Z"}],"details":{"listingId":"b3f9c725-1a0a-447d-b406-dcaea928479f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/141 \\\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/141"},{"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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/141"}],"useCases":["Accessing premium data or services without API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows requiring permissionless pay-per-use endpoints"],"bestFor":["Developers wanting zero-signup API access with crypto payments","AI agents that can autonomously pay for API calls via x402","Users who prefer per-request billing over subscriptions"],"notFor":["Users needing detailed API documentation or schemas before integration","Applications requiring fiat-only payment methods","High-volume use cases where per-request pricing may not be economical compared to bulk plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.641Z"},"updatedAt":"2026-04-25T00:05:09.822Z"}}