{"id":"0c656b21-5794-469a-ba4b-98a5efe1892a","shortId":"HTSAhh","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/65` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 per request price point and settle via USDC on Base.\n\nThe specific functionality behind `/api/v1/transfers/65` is not documented beyond the label \"Premium API Access.\" The docs, pricing, and API pages on the site are essentially empty (showing only a \"Connect wallet\" prompt), so there is no OpenAPI schema, request/response examples, or detailed documentation available. Callers should be aware that the actual behavior of this endpoint is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["The specific functionality of /api/v1/transfers/65 ('Premium API Access') is not documented anywhere — it is unclear what data or service it returns.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no actual content.","No OpenAPI schema, request body schema, or response examples are available.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have visible documentation to verify they actually function."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/65","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/transfers/65 is completely undocumented. The docs pages are empty 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'/request':13,28 '0.02':12,27,65,148 '000':69 '20':68 '6':75 'Base network API' 'USDC API' 'accept':46 'access':62,172 'account':80 'actual':209 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,78,105,171,177 'attach':88 'avail':202,218 'awar':206 'base':8,23,51,70,158 'behavior':210 'behind':162 'beyond':167 'broader':101 'call':4,19,67 'caller':86,203 'categori':106 'classif':122 'connect':188 'convers':139 'cost':64 'data':108,112 'decim':76 'detail':200 'doc':174 'document':166,201 'embed':123 'empti':184 'endpoint':55,142,213 'essenti':183 'estim':133 'exampl':198 'exchang':128 'export':113 'feed':127 'financ':124 'function':161 'gas':132 'generat':140 'geocod':137 'header':93 'http-post' 'includ':107 'infrastructur':135 'insight':114 'key':79 'label':169 'learn':117 'limit':83 'list':58,144 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':116 'materi':219 'metric':110 'micropayment API' 'multipl':104 'network':9,24,52 'no-api-key' 'openapi':195 'page':178 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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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:52.975Z"}],"sources":[{"listingId":"0c656b21-5794-469a-ba4b-98a5efe1892a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:52.975Z","lastSeenAt":"2026-04-22T23:02:17.672Z"}],"details":{"listingId":"0c656b21-5794-469a-ba4b-98a5efe1892a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/65 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/65"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/65"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various data and utility endpoints"],"bestFor":["Developers wanting zero-signup, 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 guaranteed SLAs","Anyone without USDC on the Base network","Use cases requiring free or high-volume bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.753Z"},"updatedAt":"2026-04-22T23:02:17.672Z"}}