{"id":"67d34e95-2dab-4ca8-ab72-90d43ef8201c","shortId":"nDGga5","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/transactions/303` 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.\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 listed at the same $0.02/request price point and settle via USDC on Base.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/303` endpoint actually returns. The endpoint is live (returns a proper 402 x402 challenge), but without documentation it is unclear what data or functionality this specific route provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-platform","finance"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for this endpoint","The purpose of /api/v1/transactions/303 is entirely unclear — 'Premium API Access' is a generic label","Cannot verify what data or functionality is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/303","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/transactions/303","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 it accepts USDC on Base at $0.02/request. However, there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the endpoint actually does beyond the generic label 'Premium API Access'. The docs/pricing/API pages are all blank wallet-connect 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'/request':13,28,149 '0.02':12,27,65,148 '000':69 '20':68 '402':205 '402 payment api' '6':75 'accept':46 'access':62 'account':80 'actual':196 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,78,105,166 'attach':88 'base':8,23,51,70,157 'base network api' 'broader':101 'call':4,19,67 'caller':86 'categori':106 'challeng':207 'classif':122 'connect':172 'convers':139 'cost':64 'data':108,112,215 'decim':76 'descript':190 'detail':179 'doc':163 'document':158,210 'embed':123 'endpoint':55,142,195,199 'estim':133 'exampl':187 'exchang':128 'export':113 'extrem':160 'feed':127 'financ':124 'function':217 'gas':132 'generat':140 'geocod':137 'header':93 'includ':107 'infrastructur':135 'insight':114 'json-response' 'key':79 'learn':117 'limit':83 'list':58,144 'live':201 'low payment fee' 'lowpaymentfee.com':31 'machin':116 'metric':110 'micropayment api' 'multipl':104 'network':9,24,52 'no-api-key' 'no-rate-limit' 'openapi':183 'page':167 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,92,98 'per':3,18,36,66 'platform':6,21,39,102 'point':151 'premium':60 'price':126,150,164 'prompt':174 'proof':99 'proper':204 'protocol':44 'provid':221 'quot':131 'rate':82,129 'render':169 'report':111 'request':37 'request/response':186 'requir':85 'return':197,202 'rout':220 'schema':184 'sentiment':118 'settl':153 'simpli':87 'spars':161 'specif':54,219 'summar':121 'technic':178 'text':120 'token':130 'unclear':213 'unit':71 'usdc':15,30,47,73,155 'usdc api' 'usdc-base-network' 'use':41 'util':136 'valid':96,138 'via':10,25,154 'wallet':173 'web3':125 'without':209 'x':91 'x-payment':90 'x402':11,26,43,97,206 'x402 api' 'x402-payment'","prices":[{"id":"3c69a7a6-2d47-4113-a8d6-8115c837d500","listingId":"67d34e95-2dab-4ca8-ab72-90d43ef8201c","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/transactions/303","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:58.621Z"}],"sources":[{"listingId":"67d34e95-2dab-4ca8-ab72-90d43ef8201c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/303","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:58.621Z","lastSeenAt":"2026-04-23T13:01:59.229Z"}],"details":{"listingId":"67d34e95-2dab-4ca8-ab72-90d43ef8201c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/303 \\\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/transactions/303"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/303"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to transaction or financial data without subscription commitments"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.189Z"},"updatedAt":"2026-04-23T13:01:59.229Z"}}