{"id":"70e9e799-3f6d-43da-84f1-0c520a462cc6","shortId":"VAyAE7","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base 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/keys/15` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — each request is settled individually on-chain.\n\nThe broader platform advertises a suite of 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\nHowever, the specific endpoint `/api/v1/keys/15` does not clearly map to any of the named API categories on the landing page. Its description is simply \"Premium API Access,\" and no documentation, request/response schema, or usage examples are provided. The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content. Without further documentation it is unclear what data or functionality this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — /api, /pricing, and /README pages only show 'Connect wallet' with no content.","The endpoint path /api/v1/keys/15 does not match any of the named APIs on the landing page; its actual functionality is unknown.","No request or response schema is provided; callers cannot know what to send or what to expect back.","No OpenAPI spec, ai-plugin manifest, or agents.txt found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/15","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/keys/15","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, no request/response schema, no examples, and the purpose of this specific endpoint is ambiguous. The /api, /pricing, and /README pages returned no useful 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'/api/v1/keys/15':56,158 '/pricing':194 '/readme':196 '/request':13,28,151 '0.02':12,27,67,81,150 '000':73 '20':72 '6':79 'Base network API' 'USDC API access' 'accept':46 'access':7,22,62,180 'across':107 'addit':207 'advertis':102 'ai':117 'analysi':121 'analyt':111 'api':6,21,38,61,83,168,179 'base':9,24,51,74 'broader':100 'call':4,19,69 'categori':109,169 'chain':98 'classif':124 'clear':161 'connect':202 'content':208 'convers':141 'cost':64 'crawl':192 'data':110,114,216 'decim':80 'descript':175 'document':183,211 'embed':125 'endpoint':55,106,144,157,221 'estim':135 'exampl':188 'exchang':130 'export':115 'feed':129 'financ':126 'four':108 'function':218 'gas':134 'generat':142 'geocod':139 'howev':154 'individu':95 'infrastructur':137 'insight':116 'json-response' 'key':84 'land':172 'learn':119 'limit':86 'list':58,146 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':118 'map':162 'maxamountrequir':70 'metric':112 'micropayment API' 'name':167 'network':52 'no-api-key' 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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/keys/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.378Z"}],"sources":[{"listingId":"70e9e799-3f6d-43da-84f1-0c520a462cc6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.378Z","lastSeenAt":"2026-04-22T01:02:18.672Z"}],"details":{"listingId":"70e9e799-3f6d-43da-84f1-0c520a462cc6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/15 \\\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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/15"},{"claim":"All listed APIs 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 USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/15"}],"useCases":["Programmatic access to premium API services without subscription or API key management","Agent-driven workflows that need on-demand, per-call payment settlement","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 pay-per-request patterns","AI agents that need frictionless, keyless API access","Low-volume or sporadic API consumers who want to avoid subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or rate-limited plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.852Z"},"updatedAt":"2026-04-22T01:02:18.672Z"}}