{"id":"99d68e87-ee65-4da0-b6b4-97153ebdeaf7","shortId":"446Mvm","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/376` 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 on the Base network. 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 address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the USDC contract used is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nHowever, the specific functionality of the `/api/v1/transactions/376` endpoint is unclear — the description is simply \"Premium API Access\" with no further documentation on what data or service it returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical documentation. Without an OpenAPI schema or response examples, the actual behavior of this endpoint remains opaque.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["infrastructure","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","crypto-paid API","lowpaymentfee"],"warnings":["No documentation available — docs/pricing/API pages only show 'Connect wallet'","The specific functionality of /api/v1/transactions/376 is undocumented","No OpenAPI schema or response examples available","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/376","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/376","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 on what this specific endpoint returns, no OpenAPI schema, no example responses, and the docs pages are empty. The actual functionality of /api/v1/transactions/376 is 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'/request':16,34 '0.02':15,33,82,130 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':147 '20':122 '6':134 'Base network API' 'USDC micropayment endpoint' 'accept':114 'access':7,25,44,96,166 'actual':204 'addit':193 'address':138 'advertis':79 'ai':69 'amount':120 'analyt':68 'api':6,24,43,89,165,182 'base':9,27,104,124,149 'behavior':205 'call':4,22 'categori':65 'challeng':108 'confirm':109 'connect':188 'contract':144 'crypto-paid API' 'data':67,173 'decim':135 'descript':161 'doc':179 'document':170,195 'endpoint':38,52,58,111,157,208 'equal':129 'exampl':202 'financ':72 'flat':81 'function':153 'given':131 'howev':150 'includ':66 'infrastructur':75 'instant':95 'json-response' 'key':90 'learn':71 'limit':93 'live':113 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':70 'mani':57 'maximum':119 'model':86 'network':10,28,105 'no-api-key' 'offer':59 'one':55 'opaqu':210 'openapi':198 'page':183 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,97,137 'per':3,21,83 'post':115 'premium':5,23,42,164 'price':85,180 'prompt':190 'protocol':13,31,49 'provid':41,62,78 'rate':92 'remain':209 'render':185 'request':84,116 'respons':201 'return':177 'schema':199 'servic':175 'settl':99 'simpli':163 'span':64 'specif':51,152 'technic':194 'unclear':159 'unit':125 'usdc':18,36,101,127,132,143 'usdc-base-network' 'use':145 'util':76 'via':11,29,45 'wallet':189 'web3':73 'without':196 'x402':12,30,47,107 'x402 API' 'x402-payment'","prices":[{"id":"22e0f174-5964-465d-a938-59bd7ab132df","listingId":"99d68e87-ee65-4da0-b6b4-97153ebdeaf7","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/376","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:31.335Z"}],"sources":[{"listingId":"99d68e87-ee65-4da0-b6b4-97153ebdeaf7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/376","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:31.335Z","lastSeenAt":"2026-04-24T06:32:43.048Z"}],"details":{"listingId":"99d68e87-ee65-4da0-b6b4-97153ebdeaf7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/376 \\\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":"Flat pricing of $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms live endpoint accepting POST with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/376"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/376"}],"useCases":["Accessing premium data or transaction information without traditional API key registration","Programmatic pay-per-use API consumption settled in USDC on Base","Agent-driven API calls where payment is handled inline via x402 protocol"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base network"],"notFor":["Users needing detailed API documentation before purchasing","Applications requiring guaranteed SLAs or support contracts","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.693Z"},"updatedAt":"2026-04-24T06:32:43.048Z"}}