{"id":"fb47605d-da8b-431b-b224-b7f498fd56d6","shortId":"2cwG9J","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. The specific path `/api/v1/transactions/80` 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 advertises a flat $0.02 per request pricing model with no API keys, no rate limits, and instant access. Payment is settled in USDC (USD Coin) on Base. 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 timeout is 300 seconds.\n\nWhile the landing page lists many endpoints across analytics, AI/ML, finance, and utility categories, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/80` endpoint specifically returns. The exact functionality of this particular endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","finance"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","transactions api"],"warnings":["No documentation available — docs/pricing/README pages only show 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/transactions/80 is not documented anywhere in crawled materials","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/80","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/80","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 the specific function of /api/v1/transactions/80 is undocumented. Effectively a stub 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'/request':13,28 '0.02':12,27,80,128 '000':121 '20':120 '300':138 '6':132 'accept':112 'access':7,22,38,94 'across':147 'addit':174 'advertis':77 'ai':67 'ai/ml':149 'amount':118 'analyt':66,148 'api':6,21,37,87,160 'avail':205 'base':9,24,46,103,122 'base network api' 'base-network' 'call':4,19 'categori':63,153 'challeng':106 'coin':101 'confirm':107 'connect':169 'data':65 'decim':133 'descript':187 'detail':176 'doc':159 'document':154 'endpoint':32,56,109,146,192,201 'equal':127 'exact':196 'exampl':184 'extrem':156 'financ':70,150 'flat':79 'function':197 'given':129 'includ':64 'infrastructur':73 'instant':93 'key':88 'land':142 'learn':69 'limit':91 'list':144 'live':111 'low payment fee' 'lowpaymentfee.com':34 'machin':68 'mani':55,145 'materi':206 'maximum':117 'micropayment api' 'model':84 'network':47 'no-api-key' 'offer':57 'one':53 'openapi':180 'page':143,164 'particular':200 'path':50 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':42,95,135 'per':3,18,81 'platform':60,76 'post':113 'post-method' 'premium':5,20,36 'price':83,161 'prompt':171 'protocol':43 'provid':35 'rate':90 'readm':163 'render':166 'request':82,114 'request/response':183 'return':194 'schema':181 'second':139 'settl':97 'span':62 'spars':157 'specif':49,193 'technic':175 'timeout':136 'transactions api' 'unclear':203 'unit':123 'usd':100 'usdc':15,30,99,125,130 'usdc api' 'usdc-settlement' 'util':74,152 'via':10,25,39 'wallet':170 'web3':71 'x402':11,26,41,105 'x402 api' 'x402-payment'","prices":[{"id":"4c8d7d54-15ee-4c8d-a4c9-27ce80b486b1","listingId":"fb47605d-da8b-431b-b224-b7f498fd56d6","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:11.265Z"}],"sources":[{"listingId":"fb47605d-da8b-431b-b224-b7f498fd56d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:11.265Z","lastSeenAt":"2026-04-22T12:04:42.224Z"}],"details":{"listingId":"fb47605d-da8b-431b-b224-b7f498fd56d6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/80 \\\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 confirms live endpoint accepting POST with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/80"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/80"}],"useCases":["Accessing premium data or transaction information with per-call USDC micropayments","Integrating pay-as-you-go API calls into agent workflows without managing API keys","Programmatic access to services settled on Base L2"],"bestFor":["Developers wanting keyless, pay-per-use API access","Agents with USDC on Base seeking low-friction endpoint consumption","Projects needing micropayment-gated API calls without subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer subscription-based pricing","Developers without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.796Z"},"updatedAt":"2026-04-22T12:04:42.224Z"}}