{"id":"ec6802ff-486a-47b6-8ca9-abc4e7e8320e","shortId":"WPaRM4","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/195` 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/195` endpoint is unclear. The name \"Premium API Access\" and the path segment \"transfers/195\" do not map obviously to any of the documented API categories. Documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, it is difficult to determine what data or service this particular endpoint returns.","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":["The exact functionality of /api/v1/transfers/195 ('Premium API Access') is undocumented and unclear from the path or description.","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available.","The endpoint path 'transfers/195' does not correspond to any of the advertised API categories on the landing page."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/195","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/195","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), but there is no OpenAPI schema, no request/response examples, and documentation pages are empty stubs. The specific purpose of /api/v1/transfers/195 is unclear, making this effectively a stub 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'/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 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,61,78,109,167,183 'attach':88 'base':8,23,51,70 'broader':105 'call':4,19,67 'caller':86 'categori':110,184 'classif':126 'connect':193 'content':199 'convers':143 'cost':64 'crypto-paid API' 'data':112,116,215 'decim':76 'detail':207 'determin':213 'difficult':211 'doc':187 'document':182,185,208 'embed':127 'endpoint':55,146,161,220 'estim':137 'exampl':205 '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' 'obvious':177 'openapi':202 'page':186 'particular':219 'path':171 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,92,98 'per':3,18,36,66,152 'platform':6,21,39,106 'premium':60,166 'price':130,149,188 'prompt':195 'proof':99 'protocol':44 'quot':135 'rate':82,133 'readm':189 'report':115 'request':37,153 'request/response':204 'requir':85 'resourc':103 'return':190,221 'schema':203 'segment':172 'sentiment':122 'servic':217 'simpli':87 'specif':54,156 'substant':198 'summar':125 'text':124 'token':134 'transfers/195':173 'unclear':163 'uniform':148 'unit':71 'usdc':15,30,47,73 'usdc-base-network' 'use':41 'util':140 'valid':96,142 'via':10,25 'wallet':194 'web3':129 'without':200 'x':91 'x-payment':90 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"cad0c848-f374-4721-bbaa-df53305de124","listingId":"ec6802ff-486a-47b6-8ca9-abc4e7e8320e","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/195","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:45.219Z"}],"sources":[{"listingId":"ec6802ff-486a-47b6-8ca9-abc4e7e8320e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/195","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:45.219Z","lastSeenAt":"2026-04-23T00:32:30.372Z"}],"details":{"listingId":"ec6802ff-486a-47b6-8ca9-abc4e7e8320e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/195 \\\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":"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/195"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/195"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need frictionless pay-per-use endpoints"],"bestFor":["Developers who want zero-signup API access via crypto payments","AI agents that can autonomously pay for API calls using x402","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Developers who prefer traditional API key authentication and fiat billing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.191Z"},"updatedAt":"2026-04-23T00:32:30.372Z"}}