{"id":"0b3edf3a-5ff7-406c-9782-d3af12f192c3","shortId":"rNrrM8","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/189` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe platform advertises a broad suite of endpoints (analytics, AI sentiment/summarization/classification/embeddings, finance price feeds, exchange rates, crypto gas estimates, geocoding, validation, conversion, and generation) all at the same $0.02/request price point. However, documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this specific resource are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","post-method"],"categories":["infrastructure","api"],"synonyms":["premium API","lowpaymentfee","x402 API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["No request or response schema available — the actual functionality of resource/189 is undocumented.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no technical content.","The platform lists many endpoints but none have publicly visible documentation beyond a title and price.","Cannot verify what data or service this endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/189","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/generate/resource/189","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request/response schemas, no OpenAPI spec, and the docs/pricing/README pages all returned only 'Connect wallet' with no content. The specific purpose of resource/189 is entirely 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'/request':17,34,182 '0.02':16,33,118,181 '000':111 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':102 '20':110 '6':121 'Base network API' 'USDC micropayment API' 'accept':125 'access':77 'actual':205 'advertis':138,155 'ai':162 'ai/ml':59 'amount':105 'analyt':58,161 'api':5,22,55,76,132 'application/json':130 'attach':141 'base':8,25,97,112 'beyond':85,188 'broad':157 'call':12,29,108 'caller':139 'collect':46 'connect':195 'contract':101 'convers':174 'crypto':169 'data':57,63 'decim':122 'detail':202 'document':84,186 'endpoint':6,23,36,124,160 'equal':117 'estim':171 'exact':80 'exchang':167 'feed':166 'financ':61,164 'function':81 'gas':170 'gate':3,20 'generat':176 'geocod':172 'handl':90 'header':146 'howev':185 'infer':60 'infrastructur':65 'json-api' 'key':133 'label':87 'land':190 'limit':136 'list':73 'lowpaymentfee' 'lowpaymentfee.com':41 'maximum':104 'network':98 'offer':44 'page':187,191 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':88,145,151 'per':11,28,53,107 'platform':42,154 'point':184 'post':126 'post-method' 'premium':4,21,75 'premium API' 'price':165,183 'prompt':197 'proof':152 'protocol':50,94 'rate':135,168 'request':54,127 'request/response':206 'requir':106 'resourc':69,211 'return':129,192 'schema':207 'sentiment/summarization/classification/embeddings':163 'simpli':140 'span':56 'specif':68,210 'suit':158 'technic':201 'unit':113 'unknown':213 'usdc':14,31,100,115,119 'usdc-base' 'use':99,120 'util':66 'valid':149,173 'via':91 'wallet':196 'web3':62 'x':144 'x-payment':143 'x402':2,19,49,93,150 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"3b9884b5-282e-4173-a110-5bc05a59cb93","listingId":"0b3edf3a-5ff7-406c-9782-d3af12f192c3","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/generate/resource/189","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:34.615Z"}],"sources":[{"listingId":"0b3edf3a-5ff7-406c-9782-d3af12f192c3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/189","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:34.615Z","lastSeenAt":"2026-04-22T20:00:44.199Z"}],"details":{"listingId":"0b3edf3a-5ff7-406c-9782-d3af12f192c3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/189 \\\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 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/189"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/189"}],"useCases":["Programmatic access to a premium API resource 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 needing keyless pay-per-request API access","Low-cost micropayment API consumption on Base L2"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Use cases requiring free or subscription-based access without crypto wallets"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.473Z"},"updatedAt":"2026-04-22T20:00:44.199Z"}}