{"id":"244382f6-0942-4e20-9945-f6e5f31f5f5b","shortId":"pbjw37","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transfers/160` is listed as \"Premium API Access\" and accepts POST requests with x402 payment of up to 0.02 USDC per call (20,000 base units with 6 decimals). No API keys or rate limits are advertised; access is gated entirely by the x402 payment protocol.\n\nThe wider platform advertises four endpoint 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 $0.02 per request.\n\nHowever, the specific functionality behind the `/api/v1/transfers/160` endpoint is unclear. The description is simply \"Premium API Access\" with no further documentation, input schema, or example responses available. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical content. Without documentation or response examples, it is difficult to determine what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet'","The endpoint description 'Premium API Access' is generic and does not describe what the endpoint actually does","No input or output schema provided; callers cannot know what to send or what to expect back","The /api/v1/transfers/160 path suggests a transfer-related operation but this is speculative"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/160","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/160","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 402 challenge, confirming it accepts USDC on Base at $0.02 per call. However, there is no documentation, no input/output schema, no example responses, and the endpoint name 'Premium API Access' is entirely generic. The docs pages are empty beyond a wallet-connect prompt. The actual functionality of this specific endpoint is 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'0.02':80,153 '000':85 '20':84 '6':89 'Base network API' 'USDC API' 'accept':71 'access':69,99,172 'addit':198 'advertis':98,111 'ai':12,28,122 'analysi':126 'analyt':116 'api':5,21,39,68,92,171,187 'avail':182 'base':8,24,57,86 'base-network' 'behind':160 'broad':44 'call':4,20,83 'catalog':45 'categori':114 'classif':129 'connect':193 'content':200 'convers':146 'cover':10,26 'data':11,27,115,119,212 'decim':90 'descript':167 'determin':210 'difficult':208 'doc':184 'document':176,202 'embed':130 'enabl':38 'endpoint':16,32,51,61,113,149,163,217 'entir':102 'estim':140 'exampl':180,205 'exchang':135 'export':120 'feed':134 'financ':13,29,131 'four':112 'function':159 'gas':139 'gate':101 'generat':147 'geocod':144 'howev':156 'infrastructur':142 'input':177 'insight':121 'key':93 'learn':124 'limit':96 'list':65,151 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':123 'metric':117 'micropayment API' 'network':58 'no-api-key' 'offer':42 'page':188 'particular':216 'pay':2,18,48 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':47 'payment':76,106 'per':3,19,49,82,154 'platform':6,22,40,110 'post':72 'post-endpoint' 'premium':67,170 'premium API access' 'price':133,185 'prompt':195 'protocol':107 'quot':138 'rate':95,136 'render':190 'report':118 'request':50,73,155 'respons':181,204 'return':218 'schema':178 'sentiment':125 'servic':214 'settl':52 'simpli':169 'specif':60,158 'summar':128 'technic':199 'text':127 'token':137 'unclear':165 'unit':87 'usdc':9,25,54,81 'usdc-settlement' 'util':15,31,143 'valid':145 'wallet':194 'web3':132 'wider':109 'without':201 'x402':37,75,105 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"61e8d32a-dd7f-4824-8dbc-a64d59f3f1a2","listingId":"244382f6-0942-4e20-9945-f6e5f31f5f5b","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/transfers/160","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:38.593Z"}],"sources":[{"listingId":"244382f6-0942-4e20-9945-f6e5f31f5f5b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/160","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:38.593Z","lastSeenAt":"2026-04-23T02:01:53.238Z"}],"details":{"listingId":"244382f6-0942-4e20-9945-f6e5f31f5f5b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/160 \\\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 (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/160"},{"claim":"All endpoints are priced at $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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API endpoints without traditional API key registration","Making micropayment-gated API calls settled on Base L2 in USDC","Agent-driven programmatic access to data, AI, or utility services via x402"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or response schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.467Z"},"updatedAt":"2026-04-23T02:01:53.238Z"}}