{"id":"d49d135c-c344-4076-883f-db7eeb8b5975","shortId":"WA9hKv","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/2` is listed as \"Premium API Access\" and accepts POST requests. The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.\n\nThe site offers four broad categories of endpoints: 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 call.\n\nThe x402 challenge for this specific endpoint shows a `maxAmountRequired` of 20000 base units of USDC (contract `0x8335...2913` on Base), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint is live and returns a proper 402 challenge. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. The actual behavior, request format, and response schema for the `/api/v1/transfers/2` endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","premium-api-access"],"categories":["infrastructure","finance"],"synonyms":["low payment fee","x402 api","micropayment api","usdc api","base network api","pay per call api","crypto payment api"],"warnings":["No documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content","The purpose and expected input/output of /api/v1/transfers/2 is unknown; 'Premium API Access' is not descriptive","No OpenAPI schema or response schema provided","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/2","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing at $0.02 USDC on Base. However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the specific '/api/v1/transfers/2' endpoint is entirely unclear beyond the generic label 'Premium API Access'. The docs/pricing/README pages are all empty wallet-connect 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'/request':13,28 '0.02':12,27,72,135,161 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':175 '0x8335':155 '20000':149 '2913':156 '402':184 '6':165 'accept':46,64 'access':62,88 'across':75 'actual':210 'address':174 'advertis':69 'ai':104 'analysi':108 'analyt':98 'api':5,20,38,61,81,193 'base':8,23,51,150,158 'base network api' 'behavior':211 'broad':93 'call':4,19,137 'categori':94 'chain':172 'challeng':140,185 'classif':111 'connect':202 'content':208 'contract':154 'convers':128 'crypto payment api' 'data':97,101 'decim':166 'doc':192 'document':187 'embed':112 'endpoint':55,78,96,131,144,177,220 'equal':160 'estim':122 'exchang':117 'export':102 'extrem':189 'feed':116 'financ':113 'flat':71 'format':213 'four':92 'gas':121 'generat':129 'geocod':126 'given':162 'howev':186 'infrastructur':124 'insight':103 'instant':87 'key':82 'learn':106 'limit':85 'list':58 'live':179 'low payment fee' 'lowpaymentfee.com':31 'machin':105 'maxamountrequir':147 'metric':99 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':91 'on-chain':170 'page':197 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,167 'per':3,18,36,73,136 'platform':6,21,39,68 'post':65 'post-endpoint' 'premium':60 'premium-api-access' 'price':115,133,194 'prompt':204 'proper':183 'protocol':44 'quot':120 'rate':84,118 'readm':196 'render':199 'report':100 'request':37,66,74,212 'respons':215 'return':181 'schema':216 'sentiment':107 'settl':169 'show':145 'site':90 'spars':190 'specif':54,143 'substant':207 'summar':110 'text':109 'token':119 'unit':151 'unknown':222 'usdc':15,30,47,153,163 'usdc api' 'usdc-base' 'use':41 'util':125 'valid':127 'via':10,25 'wallet':203 'web3':114 'x402':11,26,43,139 'x402 api' 'x402-payment'","prices":[{"id":"abcc2043-91a2-494f-bf34-609e7de0c7dd","listingId":"d49d135c-c344-4076-883f-db7eeb8b5975","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:47.001Z"}],"sources":[{"listingId":"d49d135c-c344-4076-883f-db7eeb8b5975","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:47.001Z","lastSeenAt":"2026-04-23T20:33:15.377Z"}],"details":{"listingId":"d49d135c-c344-4076-883f-db7eeb8b5975","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/2 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/2"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/2"},{"claim":"The site offers 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 with crypto micropayments","Low-volume, on-demand API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.099Z"},"updatedAt":"2026-04-23T20:33:15.377Z"}}