{"id":"9a171863-0e4b-4bd2-b573-b58557abf846","shortId":"dhjgeV","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/18` 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 to access the resource.\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 uniformly priced at $0.02 per request.\n\nHowever, the specific functionality of the `/api/v1/transfers/18` endpoint is unclear. The name \"Premium API Access\" and the path segment \"transfers/18\" do not map obviously to any of the documented API categories. Documentation pages (/docs, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, the actual behavior and output of this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limits","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","All doc pages (/docs, /pricing, /README) returned only 'Connect wallet' with no content","The specific functionality of /api/v1/transfers/18 ('Premium API Access') is unclear — the path does not match any documented API category","No request body schema or response format is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/18","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/18","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), but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The specific purpose of /api/v1/transfers/18 is 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'/docs':187 '/pricing':188 '/readme':189 '/request':13,28 '0.02':12,27,65,151 '000':69 '20':68 '402 payment API' '6':75 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,101,168 'account':80 'actual':211 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,61,78,109,167,183 'attach':88 'base':8,23,51,70 'behavior':212 'broader':105 'call':4,19,67 'caller':86 'categori':110,184 'classif':126 'connect':194 'content':200 'convers':143 'cost':64 'crypto-paid API' 'data':112,116 'decim':76 'detail':208 'document':182,185,209 'embed':127 'endpoint':55,146,161,217 'estim':137 'exampl':206 'exchang':132 'export':117 'feed':131 'financ':128 'function':157 'gas':136 'generat':144 'geocod':141 'header':93 'howev':154 'http-post' 'includ':111 'infrastructur':139 'insight':118 'key':79 'learn':121 'limit':83 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'map':176 'metric':114 'multipl':108 'name':165 'network':9,24,52 'no-api-key' 'no-rate-limits' 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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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:49.389Z"}],"sources":[{"listingId":"9a171863-0e4b-4bd2-b573-b58557abf846","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:49.389Z","lastSeenAt":"2026-04-23T00:32:30.543Z"}],"details":{"listingId":"9a171863-0e4b-4bd2-b573-b58557abf846","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/18 \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/18"},{"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 APIs across Data & Analytics, AI & ML, 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/transfers/18"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-key API access"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","Applications requiring free or fiat-only payment methods","Production workloads that need guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.985Z"},"updatedAt":"2026-04-23T00:32:30.543Z"}}