{"id":"632df420-ea86-4bc0-86ef-6ade2f3bc853","shortId":"gUqYQB","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. It accepts POST requests and charges 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02 per call (USDC uses 6 decimals). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint `/api/v1/transactions/47` is listed under the provider's umbrella of services but its exact functionality is not documented beyond the label \"Premium API Access.\" The broader lowpaymentfee.com platform advertises multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02/request. Without further documentation or response examples for this particular transaction endpoint, the precise data returned is unclear.\n\nThe endpoint is confirmed live: it returns a proper 402 challenge with x402 version 1, specifying the exact payment scheme, asset, network, and payTo address. Settlement occurs on Base mainnet in USDC with a 300-second timeout window.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content","The exact functionality of /api/v1/transactions/47 is undocumented; 'Premium API Access' is a generic label","No response schema or example responses are available to verify what the endpoint actually returns","Multiple advertised endpoints on the platform share identical pricing and vague descriptions, raising questions about actual service delivery"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/47","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/47","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 with a valid 402 challenge, but there is no documentation on what data it returns, no request/response schema, and the docs/pricing/README pages all render only a wallet-connect prompt with no useful content. The specific purpose of '/api/v1/transactions/47' is unknown beyond its generic 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'/request':13,28,141 '0.02':12,27,63,140 '000':55 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':60 '1':173 '20':54 '300':193 '402':168 '6':68 'Base network API' 'USDC micropayment endpoint' 'accept':49 'access':7,22,38,117 'address':183 'advertis':122 'ai':129 'analyt':128 'api':6,21,37,71,116,124 'asset':179 'attach':80 'base':9,24,46,56,187 'base-network' 'beyond':112 'broader':119 'call':4,19,65 'caller':78 'categori':125 'challeng':169 'charg':53 'confirm':162 'crypto-paid API' 'data':127,155 'decim':69 'document':111,144 'endpoint':32,94,152,160 'equal':62 'exact':107,176 'exampl':147 'financ':132 'function':108 'header':85 'includ':126 'infrastructur':135 'key':72 'label':114 'learn':131 'limit':75 'list':97 'live':163 'lowpaymentfee' 'lowpaymentfee.com':34,120 'machin':130 'mainnet':188 'multipl':123 'network':47,180 'no-api-key' 'occur':185 'particular':150 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,84,90,177 'payto':182 'per':3,18,64 'platform':121 'post':50 'post-method' 'precis':154 'premium':5,20,36,115 'premium API access' 'price':138 'proof':91 'proper':167 'protocol':43 'provid':35,100 'rate':74 'request':51 'requir':77 'respons':146 'return':156,165 'scheme':178 'second':194 'servic':104 'settlement':184 'simpli':79 'specif':93 'specifi':174 'timeout':195 'transact':151 'umbrella':102 'unclear':158 'unit':57 'usdc':15,30,59,66,190 'usdc-settlement' 'use':67 'util':136 'valid':88 'version':172 'via':10,25,39 'web3':133 'window':196 'without':142 'x':83 'x-payment':82 'x402':11,26,41,89,171 'x402 API' 'x402-payment'","prices":[{"id":"92be5337-d5b5-4ff9-b278-d887afbcf3cd","listingId":"632df420-ea86-4bc0-86ef-6ade2f3bc853","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:41.739Z"}],"sources":[{"listingId":"632df420-ea86-4bc0-86ef-6ade2f3bc853","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:41.739Z","lastSeenAt":"2026-04-22T07:31:54.179Z"}],"details":{"listingId":"632df420-ea86-4bc0-86ef-6ade2f3bc853","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/47 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/47"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/47"}],"useCases":["Programmatic access to premium data or services without subscription commitments","Agent-driven workflows that need instant API access without credential provisioning","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers wanting zero-signup API access paid in USDC on Base","AI agents that can autonomously pay for API calls via x402","Projects needing low-cost per-request billing without rate limits"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.193Z"},"updatedAt":"2026-04-22T07:31:54.179Z"}}