{"id":"f9439b88-c238-47b1-8075-08228affc001","shortId":"Pfd2aA","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/wire/4` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 payment protocol, settling in USDC on the Base network. The advertised price across the platform is $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific `/api/v1/wire/4` endpoint is labeled \"Premium API Access\" but its exact functionality is not documented beyond that title. The x402 challenge confirms it is live, accepts POST requests, and requires up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout window.\n\nThe broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas, parameter descriptions, and example payloads are unavailable.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The exact functionality of /api/v1/wire/4 ('Premium API Access') is not described anywhere in the crawled content","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content","No request or response schema is available — callers cannot know what parameters to send or what to expect back","The platform lists many endpoints but none have detailed documentation visible without a connected wallet"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/4","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/wire/4 is undocumented. No request/response schemas, no examples, and all documentation pages are empty beyond a wallet-connect prompt. The listing is effectively a stub with confirmed liveness and 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'/docs':196 '/pricing':197 '/readme':198 '0.02':12,28,87,142,190 '000':136 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':155 '20':135 '300':160 '6':146 'Base network API' 'USDC API' 'accept':128 'access':7,23,110 'across':83 'address':154 'advertis':81 'ai':56 'analysi':171 'analyt':55 'api':6,22,52,92,109 'base':9,25,78,137,157 'base-network' 'beyond':118 'broader':165 'call':4,20,149 'challeng':123 'classif':174 'commit':100 'confirm':124 'connect':202 'content':208 'convers':182 'data':54,184 'decim':147 'descript':214 'detail':210 'document':117,194 'embed':175 'endpoint':34,65,105,168 'exact':113 'exampl':216 'exchang':178 'export':185 'feed':177 'financ':59 'function':114 'gate':67 'geocod':180 'given':143 'howev':193 'i.e':141 'infrastructur':62 'key':93 'label':107 'learn':58 'limit':96 'list':167 'live':127 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':57 'made':152 'micropayment API' 'minimum':99 'network':79 'no-api-key' 'offer':44 'page':195 'paramet':213 'part':38 'pay':2,18,49 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':48 'payload':217 'payment':71,150 'per':3,13,19,29,50,88,148 'platform':42,85,166 'point':192 'post':129 'post-method' 'premium':5,21,108 'premium API' 'price':82,176,191 'prompt':204 'protocol':72 'rate':95,179 'request':14,30,51,89,130 'request/response':211 'requir':101,132 'return':199 'schema':212 'second':161 'sentiment':170 'settl':73 'span':53 'specif':103 'substant':207 'suit':46 'summar':173 'text':172 'timeout':162 'titl':120 'unavail':219 'unit':138 'usdc':16,32,75,140,144 'usdc-settlement' 'util':63 'valid':181 'via':10,26,68 'wallet':203 'web3':60 'window':163 'x402':11,27,70,122 'x402 API' 'x402-payment'","prices":[{"id":"37ec403f-ba4b-45af-8304-a2c585c319cd","listingId":"f9439b88-c238-47b1-8075-08228affc001","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:54.970Z"}],"sources":[{"listingId":"f9439b88-c238-47b1-8075-08228affc001","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:54.970Z","lastSeenAt":"2026-04-22T10:02:35.849Z"}],"details":{"listingId":"f9439b88-c238-47b1-8075-08228affc001","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/4 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/4"},{"claim":"Platform-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/4"}],"useCases":["Programmatic access to a premium API endpoint with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API calls settled on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that need frictionless pay-per-call access without API key management","Low-volume consumers who want no-commitment, no-minimum pricing"],"notFor":["Users who need detailed API documentation or well-defined schemas before integrating","High-volume production workloads where per-request crypto settlement adds latency or cost overhead","Developers who require non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.763Z"},"updatedAt":"2026-04-22T10:02:35.849Z"}}