{"id":"80094e4a-d013-4812-8280-fdf4b42f4a5d","shortId":"jdaZbV","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/156` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request given USDC's 6 decimals.\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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific functionality of the `/api/v1/transfers/156` endpoint is unclear — it does not map to any of the documented API categories on the landing page, and the description \"Premium API Access\" is generic. Documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint on the platform.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"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 specific endpoint /api/v1/transfers/156 is not listed among the documented APIs on the landing page — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content.","No OpenAPI schema, request format, or response examples are available for any endpoint.","The platform's actual data sources and AI model capabilities are unverified — the landing page lists categories but provides no technical details."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/156","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/156","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, there is no OpenAPI schema, no request/response examples, no meaningful documentation (all doc pages show only 'Connect wallet'), and the specific purpose of /api/v1/transfers/156 is undocumented. The listing is effectively a 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'/api/v1/transfers/156':56,167 '/docs':196 '/pricing':198 '/readme':199 '/request':13,28 '0.02':12,27,92,146 '000':82 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':87 '20':81 '402 payment API' '6':98 'Base network API' 'USDC micropayment API' 'accept':46,64 'access':62,191 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,105,151,180,190 'avail':223 'base':8,23,51,83,89 'broader':101 'call':4,19 'categori':106,181 'challeng':76 'classif':122 'commit':159 'connect':204 'content':210 'convers':139 'crypto-paid API' 'data':108,112 'decim':99 'descript':188 'detail':221 'document':179,194,222 'embed':123 'endpoint':55,142,168,229 'equal':91 'estim':133 'exact':72 'exampl':218 'exchang':128 'export':113 'feed':127 'financ':124 'function':164 'gas':132 'generat':140 'generic':193 'geocod':137 'given':95 'howev':161 'includ':107 'indic':77 'infrastructur':135 'insight':114 'json-response' 'key':152 'land':184 'learn':117 'limit':155 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':116 'map':174 'maxamountrequir':79 'metric':110 'minimum':158 'multipl':104 'network':9,24,52 'no-api-key' 'openapi':214 'page':185,195 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,68 'per':3,18,36,93,147 'platform':6,21,39,102,232 'post':65 'post-method' 'premium':60,189 'price':126,144 'prompt':206 'protocol':44 'quot':131 'rate':129,154 'report':111 'request':37,66,94,148 'request/response':217 'requir':160 'return':201 'schema':215 'scheme':73 'sentiment':118 'specif':54,163 'substant':209 'summar':121 'text':120 'token':130 'unclear':170 'unit':84 'usdc':15,30,47,86,96 'usdc-base-network' 'use':41 'util':136 'valid':138 'via':10,25,69 'wallet':205 'web3':125 'x402':11,26,43,71,75 'x402 API' 'x402-payment'","prices":[{"id":"b83ef531-da38-4887-8c16-65b86dbcc450","listingId":"80094e4a-d013-4812-8280-fdf4b42f4a5d","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/156","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:32.525Z"}],"sources":[{"listingId":"80094e4a-d013-4812-8280-fdf4b42f4a5d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/156","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:32.525Z","lastSeenAt":"2026-04-23T03:32:01.707Z"}],"details":{"listingId":"80094e4a-d013-4812-8280-fdf4b42f4a5d","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base, $0.02/call)\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/156 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/156"},{"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 & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API endpoints with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to data, AI, finance, or utility endpoints without subscriptions"],"bestFor":["Developers who want to pay per request without API key management","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayment access to API services"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client","High-volume use cases where per-request pricing may be inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.79Z"},"updatedAt":"2026-04-23T03:32:01.707Z"}}