{"id":"966c6ba5-4fec-485b-93c7-e35651a1ee6a","shortId":"7NxYtA","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 `/api/v1/wire/6` is one of many pay-per-call APIs offered by lowpaymentfee.com, labeled \"Premium API Access.\" The site advertises a broad catalog of endpoints spanning data & analytics, AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The endpoint requires no API keys, advertises no rate limits, and promises instant access.\n\nHowever, the specific functionality behind `/api/v1/wire/6` is unclear — the description is simply \"Premium API Access\" with no further documentation. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no explanation of what data or service this particular endpoint returns. The site appears to be a demonstration or early-stage platform for x402-based micropayments rather than a fully documented production API.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-call","no-api-key","post-endpoint"],"categories":["infrastructure","payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — all doc/pricing/API pages show only 'Connect wallet'","The specific functionality of /api/v1/wire/6 is unknown; 'Premium API Access' is the only description","No OpenAPI schema or request/response examples provided","Site may be a demo or early-stage platform rather than a production service"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/6","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/wire/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","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 functionality of /api/v1/wire/6 is entirely undescribed. Docs pages render only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,93,142 '000':138 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':127 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':131 '20':137 '6':146 'Base network API' 'USDC pay-per-call' 'accept':116 'access':7,22,50,161,176 'address':126 'advertis':53,154 'ai':62 'amount':135 'analysi':66 'analyt':61 'api':6,21,43,49,152,175,184,242 'appear':221 'base':9,24,101,139,234 'behind':166 'broad':55 'call':4,19,42 'catalog':56 'chain':124 'challeng':109 'classif':69 'confirm':110 'connect':192 'content':198 'contract':130 'convers':86 'crypto-paid endpoint' 'data':60,212 'decim':147 'demonstr':225 'descript':171 'doc':182 'document':180,240 'earli':228 'early-stag':227 'embed':70 'endpoint':32,58,89,112,149,217 'estim':80 'exampl':206 'exchang':75 'explan':209 'feed':74 'financ':71 'fulli':239 'function':165 'gas':79 'generat':87 'geocod':84 'given':143 'howev':162 'i.e':141 'infrastructur':82 'instant':160 'key':153 'label':47 'learn':64 'limit':157 'live':114 'lowpaymentfee' 'lowpaymentfee.com':46 'machin':63 'mani':38 'max':134 'micropay':235 'micropayment API' 'network':102 'no-api-key' 'offer':44 'on-chain':122 'one':36 'openapi':202 'page':187 'paid':96 'particular':216 'pay':2,17,40 'pay-per-cal':1,16,39 'pay-per-call' 'payment':119 'per':3,18,41,94 'platform':230 'post':117 'post-endpoint' 'premium':5,20,48,174 'premium API access' 'price':73,91,183 'product':241 'promis':159 'prompt':194 'protocol':106 'quot':78 'rate':76,156 'rather':236 'readm':186 'render':189 'request':95,118 'request/response':205 'requir':150 'return':218 'schema':203 'sentiment':65 'servic':214 'settl':121 'simpli':173 'site':52,220 'span':59 'specif':164 'stage':229 'substant':197 'summar':68 'text':67 'token':77 'unclear':169 'unit':140 'usdc':15,30,98,129,144 'usdc-base-network' 'use':128 'util':83 'valid':85 'via':10,25,103 'wallet':193 'web3':72 'x402':11,26,105,108,233 'x402 API' 'x402-based':232 'x402-payment'","prices":[{"id":"3d34fbf3-3559-4cd7-a9cb-86fd94242ef2","listingId":"966c6ba5-4fec-485b-93c7-e35651a1ee6a","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/wire/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:15.557Z"}],"sources":[{"listingId":"966c6ba5-4fec-485b-93c7-e35651a1ee6a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:15.557Z","lastSeenAt":"2026-04-22T02:31:41.843Z"}],"details":{"listingId":"966c6ba5-4fec-485b-93c7-e35651a1ee6a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/6 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/6"},{"claim":"Site offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Testing x402 payment flows against a live endpoint","Exploring pay-per-call API patterns without API key management","Integrating micropayment-gated services into agent workflows"],"bestFor":["Developers experimenting with x402 protocol integration","Agents needing a low-cost, no-auth API endpoint on Base","Prototyping crypto-micropayment workflows"],"notFor":["Production use requiring documented request/response schemas","Users needing detailed API documentation or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.871Z"},"updatedAt":"2026-04-22T02:31:41.843Z"}}