{"id":"3bf9555b-7625-44a5-a16d-65b7cfbcd49b","shortId":"PdJhU2","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/65` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\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/transactions/65`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that label. The docs, pricing, and API pages on the site are essentially empty (showing only a \"Connect wallet\" prompt), so there is no OpenAPI schema, request/response examples, or detailed documentation available. The endpoint is live and responds with a valid x402 challenge via POST.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","402 payment protocol"],"warnings":["The actual functionality of /api/v1/transactions/65 ('Premium API Access') is not documented anywhere — it is unclear what data or service it returns.","All documentation pages (docs, pricing, API, README) are effectively empty, showing only 'Connect wallet'.","No OpenAPI schema, request body schema, or response schema is available.","The platform's legitimacy and reliability cannot be verified from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/65","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/65","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 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' is undefined. The docs/pricing/API pages are all blank beyond a wallet connect 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 '402 payment protocol' 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,92,163 'across':108 'actual':166 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,162,178 'attach':95 'avail':203 'base':8,23,51,73 'beyond':171 'broader':104 'call':4,19,80 'categori':110 'challeng':67,214 'classif':125 'connect':189 'convers':142 'data':111,115 'detail':201 'doc':175 'document':170,202 'embed':126 'empti':185 'endpoint':55,107,145,157,205 'essenti':184 'estim':136 'exampl':199 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':167 'gas':135 'generat':143 'geocod':140 'header':99 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'label':160,173 'learn':120 'limit':89 'list':58,147 'live':207 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':106 'openapi':196 'page':179 'particular':156 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'post':216 'post-method' 'premium':60,161 'price':129,153,176 'prompt':191 'protocol':44 'quot':134 'rate':88,132 'report':114 'request':37,68,102 'request/response':198 'respond':209 'return':64 'schema':197 'sentiment':121 'show':186 'simpli':94 'site':182 'specif':54 'summar':124 'text':123 'token':133 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141,212 'via':10,25,215 'wallet':190 'web3':128 'x402':11,26,43,97,213 'x402 API' 'x402-payment'","prices":[{"id":"cb5fe161-6dfd-4022-b901-8581611842ad","listingId":"3bf9555b-7625-44a5-a16d-65b7cfbcd49b","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:01.572Z"}],"sources":[{"listingId":"3bf9555b-7625-44a5-a16d-65b7cfbcd49b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:01.572Z","lastSeenAt":"2026-04-23T06:31:40.058Z"}],"details":{"listingId":"3bf9555b-7625-44a5-a16d-65b7cfbcd49b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/65 \\\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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/65"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints 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/65"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Testing x402 protocol integration on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-as-you-go API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads where per-call crypto payments add latency","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.261Z"},"updatedAt":"2026-04-23T06:31:40.058Z"}}