{"id":"74edb0f9-e766-4196-a6f0-e1b51173b576","shortId":"cpJdBh","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transfers/68` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), 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 listed at the same $0.02/request price point.\n\nThis particular endpoint (`/api/v1/transfers/68`) is labeled generically as \"Premium API Access\" and does not appear in the site's public API catalog, so its exact functionality is unclear. No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl — the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live via a valid 402 challenge, but the lack of documentation makes it difficult to determine what data or service it actually provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API"],"warnings":["The exact functionality of /api/v1/transfers/68 is undocumented and unclear — it does not appear in the site's public API catalog.","No OpenAPI schema, request body schema, or response examples are available.","All documentation pages (docs, pricing, API, README) rendered only a 'Connect wallet' prompt with no usable content.","The endpoint's 'Premium API Access' label is generic and uninformative."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/68","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/transfers/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (valid 402 challenge captured) 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/transfers/68 is unknown. The docs pages returned only wallet-connect prompts with no 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66,221 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,165 'across':108 'actual':238 'addit':211 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,164,175,200 'appear':169 'attach':95 'base':8,23,51,73 'broader':104 'call':4,19,80 'catalog':176 'categori':110 'challeng':67,222 'classif':125 'confirm':216 'connect':206 'content':212 'convers':142 'crawl':195 'data':111,115,234 'detail':189 'determin':232 'difficult':230 'doc':197 'document':190,227 'embed':126 'endpoint':55,107,145,157,214 'estim':136 'exact':179 'exampl':187 'exchang':131 'export':116 'feed':130 'financ':127 'found':192 'four':109 'function':180 'gas':135 'generat':143 'generic':161 'geocod':140 'header':99 'http-post' 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'label':160 'lack':225 'learn':120 'limit':89 'list':58,147 'live':217 'lowpaymentfee' 'lowpaymentfee.com':31 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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/transfers/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:57.898Z"}],"sources":[{"listingId":"74edb0f9-e766-4196-a6f0-e1b51173b576","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:57.898Z","lastSeenAt":"2026-04-22T23:02:17.872Z"}],"details":{"listingId":"74edb0f9-e766-4196-a6f0-e1b51173b576","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/68 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on the Base network.","source_url":"https://lowpaymentfee.com/api/v1/transfers/68"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/transfers/68"}],"useCases":["Programmatic access to paid API endpoints without traditional API key registration","Agent-driven workflows that need instant, keyless API access settled in USDC","Micropayment-gated API calls on the Base L2 network"],"bestFor":["Developers or agents who want keyless, pay-per-use API access","x402-compatible clients on the Base network","Low-friction micropayment API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.511Z"},"updatedAt":"2026-04-22T23:02:17.872Z"}}