{"id":"4d67bfbf-3541-4a0c-a04d-f6fd7160b58a","shortId":"8WysCg","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. 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/306` is listed under the generic \"Premium API Access\" description. The x402 challenge confirms it accepts POST requests, settles in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, and charges a maximum of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment is sent 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 spec, no request/response schema, and no description of what data this particular transactions endpoint returns. The platform advertises many endpoints but provides no public documentation on input parameters or response formats.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 transactions","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["No documentation available — docs/API/pricing/README pages all show only 'Connect wallet'","No OpenAPI spec or request/response schema provided","Purpose of /api/v1/transactions/306 is unclear — 'Premium API Access' is generic","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/306","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/306","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 zero documentation on what this endpoint actually does, no input/output schema, no examples, and the docs pages are empty. The listing is effectively a 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'/request':13,28 '0.02':12,27,73,132 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':119 '20':127 '300':147 '6':136 'Base network API' 'USDC micropayment API' 'accept':112 'access':7,22,38,105 'address':143 'advertis':194 'ai':60 'analyt':59 'api':6,21,37,85,104,156 'base':9,24,81,121,129 'call':4,19 'categori':56 'challeng':109 'charg':123 'commit':92 'confirm':110 'connect':165 'contract':118 'data':58,186 'decim':137 'descript':106,183 'detail':172 'doc':155 'document':150,201 'endpoint':32,49,69,96,190,196 'extrem':152 'financ':63 'format':207 'generic':102 'given':133 'i.e':131 'includ':57 'infrastructur':66 'input':203 'key':86 'learn':62 'limit':89 'list':99 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48,195 'maximum':125 'network':82 'no-api-key' 'offer':50 'one':46 'openapi':176 'page':160 'paid':76 'paramet':204 'particular':188 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,139 'per':3,18,74 'platform':53,193 'post':113 'post-method' 'premium':5,20,36,103 'price':71,157 'prompt':167 'protocol':43 'provid':35,198 'public':200 'rate':88 'readm':159 'render':162 'request':75,114 'request/response':179 'requir':93 'respons':206 'return':191 'schema':180 'second':148 'sent':141 'settl':115 'span':55 'spars':153 'spec':177 'specif':95 'technic':171 'timeout':149 'transact':189 'unit':130 'usdc':15,30,78,117,134 'usdc-base' 'util':67 'via':10,25,39 'wallet':166 'web3':64 'x402':11,26,41,108 'x402 transactions' 'x402-payment'","prices":[{"id":"d617b8fe-d303-47f3-bf65-0ab5c7a4bc91","listingId":"4d67bfbf-3541-4a0c-a04d-f6fd7160b58a","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/306","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:51.994Z"}],"sources":[{"listingId":"4d67bfbf-3541-4a0c-a04d-f6fd7160b58a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/306","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:51.994Z","lastSeenAt":"2026-04-24T11:32:47.887Z"}],"details":{"listingId":"4d67bfbf-3541-4a0c-a04d-f6fd7160b58a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/306 \\\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","source_url":"https://lowpaymentfee.com/api/v1/transactions/306"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/306"}],"useCases":["Accessing premium transaction data without subscription or API key management","Programmatic pay-per-use API calls settled in USDC on Base","Agent-driven workflows requiring on-demand paid endpoints"],"bestFor":["Developers wanting zero-commitment pay-per-call access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation before integrating","High-volume use cases where per-request pricing is inefficient","Developers without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.611Z"},"updatedAt":"2026-04-24T11:32:47.887Z"}}