{"id":"8f25d7e4-665f-42d5-b11f-30acba8aa159","shortId":"hDswgG","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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/176` 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 advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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/176`) is labeled generically as \"Premium API Access\" and does not appear in the site's public catalog of named endpoints. Its actual functionality is unclear — it may be a transfer or transaction-related endpoint given the URL path, but no documentation, request schema, or response schema is available. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","crypto"],"synonyms":["low payment fee","x402 api","usdc api","base network api","pay per call api","micropayment api","402 payment api"],"warnings":["Endpoint /api/v1/transfers/176 is not listed in the site's public API catalog — its actual functionality is unknown","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content","No request or response schema available — callers cannot know what to send or what to expect back","The generic label 'Premium API Access' provides no indication of what the endpoint actually does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/176","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/176","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, the specific endpoint's purpose is undocumented, no request/response schemas are available, and all documentation pages returned only a wallet-connect prompt with no content. The endpoint path '/api/v1/transfers/176' does not match any publicly listed API on the site, making its functionality 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'/request':13,30,153 '0.02':12,29,69,152 '000':73 '20':72 '402 payment api' '6':79 'accept':50 'access':66,166 'account':84 'across':109 'actual':181 'advertis':89 'ai':119 'analysi':123 'analyt':113 'api':5,15,22,32,42,65,82,165,213 'appear':170 'attach':92 'avail':208 'base':8,25,55,74 'base network api' 'broader':105 'call':4,21,71 'caller':90 'catalog':176 'categori':111 'classif':126 'connect':219 'content':225 'convers':143 'cost':68 'data':112,116 'decim':80 'doc':210 'document':201 'embed':127 'endpoint':59,108,146,158,179,194 'estim':137 'exchang':132 'export':117 'feed':131 'financ':128 'four':110 'function':182 'gas':136 'generat':144 'generic':162 'geocod':141 'given':195 'header':97 'infrastructur':139 'insight':118 'json-response' 'key':16,33,83 'label':161 'learn':121 'limit':87 'list':62,148 'low payment fee' 'lowpaymentfee.com':35 'machin':120 'may':186 'metric':114 'micropayment api' 'name':178 'network':56 'no-api-key' 'offer':107 'page':214 'particular':157 'path':198 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,96,102 'per':3,20,40,70 'platform':6,23,43,106 'point':155 'post-endpoint' 'premium':64,164 'price':130,154,211 'prompt':221 'proof':103 'protocol':48 'public':175 'quot':135 'rate':86,133 'relat':193 'report':115 'request':41,202 'requir':17,34 'respons':205 'return':216 'schema':203,206 'sentiment':122 'simpli':91 'site':173 'specif':58 'substant':224 'summar':125 'text':124 'token':134 'transact':192 'transaction-rel':191 'transfer':189 'unclear':184 'unit':75 'url':197 'usdc':9,26,51,77 'usdc api' 'usdc-base-network' 'use':45 'util':140 'valid':100,142 'via':10,27 'wallet':220 'web3':129 'x':95 'x-payment':94 'x402':11,28,47,101 'x402 api' 'x402-payment'","prices":[{"id":"e788a496-ebe6-44a2-a1d2-68fde36f4198","listingId":"8f25d7e4-665f-42d5-b11f-30acba8aa159","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/176","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:33.152Z"}],"sources":[{"listingId":"8f25d7e4-665f-42d5-b11f-30acba8aa159","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/176","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:33.152Z","lastSeenAt":"2026-04-23T04:02:06.302Z"}],"details":{"listingId":"8f25d7e4-665f-42d5-b11f-30acba8aa159","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/176 \\\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","source_url":"https://lowpaymentfee.com/api/v1/transfers/176"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/176"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless API access settled in USDC on Base","Low-volume, pay-per-use API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where $0.02/request adds up significantly","Anyone who needs to understand the exact response format before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.771Z"},"updatedAt":"2026-04-23T04:02:06.302Z"}}