{"id":"ec0e4622-1d50-4597-b526-1f3b1dc5eceb","shortId":"w54SPL","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network 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/20` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — 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 priced at $0.02 per request.\n\nThe specific functionality of the `/api/v1/transfers/20` endpoint is not documented beyond its \"Premium API Access\" label. The endpoint accepts POST requests and returns application/json. Payment is settled in USDC on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base-network","no-api-key","json-response","post-method"],"categories":["infrastructure","api-gateway"],"synonyms":["pay per call API","x402 endpoint","USDC API payment","micropayment API","Base network API","no-auth API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and README pages only show a wallet-connect prompt","The specific functionality of /api/v1/transfers/20 is undocumented; 'Premium API Access' is the only description","No OpenAPI spec, no request/response schema provided","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/20","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear, but there is no documentation of what the endpoint actually returns, no request/response schema, and the docs/pricing/README pages all render only a wallet-connect prompt with no useful content. The specific purpose of '/api/v1/transfers/20' beyond 'Premium API Access' is 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'/request':13,30 '0.02':12,29,69,150 '000':73 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':186 '20':72 '300':189 '6':79 'Base network API' 'USDC API payment' 'accept':50,171 'access':66,167 'across':109 'address':185 'ai':119 'analysi':123 'analyt':113 'api':5,15,22,32,42,65,82,166 'application/json':176 'attach':92 'base':8,25,55,74,183 'beyond':163 'broader':105 'call':4,21,71 'caller':90 'categori':111 'classif':126 'convers':143 'cost':68 'data':112,116 'decim':80 'document':162 'embed':127 'endpoint':59,108,146,159,170 'estim':137 'exchang':132 'export':117 'feed':131 'financ':128 'four':110 'function':155 'gas':136 'generat':144 'geocod':141 'header':97 'infrastructur':139 'insight':118 'json-response' 'key':16,33,83 'label':168 'learn':121 'limit':85 'list':62 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':120 'metric':114 'micropayment API' 'network':9,26,56 'no-api-key' 'no-auth API' 'offer':107 'pay':2,19,39 'pay per call API' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,96,102,177 'per':3,20,40,70,151 'platform':6,23,43,106 'post':172 'post-method' 'premium':64,165 'price':130,148 'proof':103 'protocol':48 'quot':135 'rate':84,133 'report':115 'request':41,152,173 'requir':17,34,89 'return':175 'second':190 'sentiment':122 'settl':179 'simpli':91 'specif':58,154 'subscript':87 'summar':125 'text':124 'timeout':191 'token':134 'unit':75 'usdc':51,77,181 'usdc-base-network' 'use':45 'util':140 'valid':100,142 'via':10,27 'web3':129 'window':192 'x':95 'x-payment':94 'x402':11,28,47,101 'x402 endpoint' 'x402-payment'","prices":[{"id":"f9c0f226-21c3-45c8-83e5-d8605e9c0303","listingId":"ec0e4622-1d50-4597-b526-1f3b1dc5eceb","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:38.012Z"}],"sources":[{"listingId":"ec0e4622-1d50-4597-b526-1f3b1dc5eceb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:38.012Z","lastSeenAt":"2026-04-22T11:32:28.447Z"}],"details":{"listingId":"ec0e4622-1d50-4597-b526-1f3b1dc5eceb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/20 \\\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/20"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/20"}],"useCases":["Accessing premium API services without creating accounts or managing API keys","Making one-off API calls with instant crypto payment on Base","Agent-driven workflows that need frictionless pay-per-use endpoints"],"bestFor":["Developers wanting zero-signup API access","AI agents that can settle payments via x402 protocol","Users who prefer per-call pricing over subscriptions"],"notFor":["Users who need free or ad-supported API access","High-volume consumers who would benefit from bulk pricing","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.455Z"},"updatedAt":"2026-04-22T11:32:28.447Z"}}