{"id":"940f0511-36a1-42f2-a802-bec141918b51","shortId":"UGnpf3","kind":"x402","title":"x402-gated premium API access on Base network, pay-per-request with USDC.","tagline":"x402-gated premium API access on Base network, pay-per-request with USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that gates access via the x402 payment protocol on the Base network. The `/api/v3/users` endpoint is described as \"Premium API Access\" and accepts POST requests. Payment is made in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 units (likely 0.02 USDC given 6 decimals, consistent with the site's advertised $0.02/request pricing). No API keys or rate limits are required; callers simply attach an X-PAYMENT header to authenticate.\n\nThe broader platform offers endpoints across several categories including data analytics (metrics, reports, insights, data export), AI/ML (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 appear to follow the same $0.02/request pricing model.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. The specific input/output schema for the `/api/v3/users` endpoint is not documented, so the exact request body format and response structure are unknown. The endpoint is live and returns a valid x402 challenge on POST.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","no-api-key","post-endpoint","premium-api"],"categories":["api-platform","web3"],"synonyms":["low payment fee","x402 API","USDC API access","pay-per-call API","Base network API","micropayment API","402 payment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet' with no content.","The input and output schemas for /api/v3/users are completely undocumented; request/response formats are unknown.","The /api/v3/users endpoint does not appear in the site's listed API catalog (which only shows v1 and v2 endpoints), raising questions about its status.","Cannot verify what data or functionality this endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/v3/users","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/v3/users","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. No input or output schema is provided for /api/v3/users, and the purpose of the endpoint beyond 'Premium API Access' is 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'/request':93,160 '0.02':81,92,159 '000':78 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':71 '20':77 '402 payment API' '6':84 'Base network API' 'USDC API access' 'accept':62 'access':6,21,42,60 'across':118 'advertis':91 'ai/ml':129 'amount':75 'analysi':131 'analyt':123 'api':5,20,38,59,96,169 'appear':154 'attach':105 'authent':112 'base':8,23,50 'base-network' 'bodi':200 'broader':114 'caller':103 'categori':120 'challeng':216 'classif':134 'connect':178 'consist':86 'content':184 'contract':70 'convers':150 'data':122,127 'decim':85 'describ':56 'doc':168 'document':163,195 'embed':135 'endpoint':54,117,153,192,208 'estim':144 'exact':198 'exchang':139 'export':128 'extrem':165 'feed':138 'finance/web3':136 'follow':156 'format':201 'gas':143 'gate':3,18,41 'generat':151 'geocod':148 'given':83 'header':110 'includ':121 'infrastructur':146 'input/output':187 'insight':126 'key':97 'like':80 'limit':100 'live':210 'low payment fee' 'lowpaymentfee.com':31 'made':67 'maximum':74 'metric':124 'micropayment API' 'model':162 'network':9,24,51 'no-api-key' 'offer':116 'page':173 'pay':11,26,35 'pay-per-call API' 'pay-per-request':10,25,34 'payment':46,65,109 'per':12,27,36 'platform':39,115 'post':63,218 'post-endpoint' 'premium':4,19,58 'premium-api' 'price':94,137,161,170 'prompt':180 'protocol':47 'quot':142 'rate':99,140 'readm':172 'render':175 'report':125 'request':13,28,37,64,199 'requir':102 'respons':203 'return':212 'schema':188 'sentiment':130 'sever':119 'simpli':104 'site':89 'spars':166 'specif':186 'structur':204 'summar':133 'text':132 'token':141 'unit':79 'unknown':206 'usdc':15,30,69,82 'usdc-payment' 'util':147 'valid':149,214 'via':43 'wallet':179 'x':108 'x-payment':107 'x402':2,17,45,215 'x402 API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"2825f777-90a1-4020-abef-84d555f3fa72","listingId":"940f0511-36a1-42f2-a802-bec141918b51","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/v3/users","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:51.855Z"}],"sources":[{"listingId":"940f0511-36a1-42f2-a802-bec141918b51","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v3/users","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:51.855Z","lastSeenAt":"2026-04-23T02:00:17.825Z"}],"details":{"listingId":"940f0511-36a1-42f2-a802-bec141918b51","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v3/users \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v3/users"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v3/users"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium user data via a single pay-per-request call without API key management","Integrating x402-compatible payment flows into agent-based workflows","Programmatic access to gated API resources using on-chain USDC micropayments"],"bestFor":["Developers building x402-native agent pipelines that need frictionless pay-per-call endpoints","Projects that want to avoid API key provisioning and subscription commitments","Web3-native applications already operating on the Base network with USDC"],"notFor":["Users who need detailed API documentation or well-defined schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T08:20:49.648Z"},"updatedAt":"2026-04-23T02:00:17.825Z"}}