{"id":"a78875db-27d0-475a-a66d-0e3a64f82278","shortId":"rGQJf9","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/79` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint 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 probed here (`/api/v1/keys/79`) 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 schemas, or usage examples are available. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. Without knowing what this endpoint actually returns, callers should treat it as an opaque paid resource until further documentation is published.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /api, /pricing, and /README pages all returned only 'Connect wallet' with no content.","The endpoint path /api/v1/keys/79 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/79","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/79","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, and no explanation of what /api/v1/keys/79 actually does. The crawled pages beyond the landing page returned no useful content. This is effectively a stub 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'/request':19,38,168 '0.02':18,37,80,167 '000':84 '20':83 '6':90 'Base network API' 'USDC micropayment API' 'access':75,199 'account':102 'actual':233 'addit':226 'advertis':123 'ai':12,31,134 'analysi':138 'analyt':128 'api':5,24,45,74,100,187,198 'attach':109 'avail':209 'base':8,27,63,85 'base-network' 'broad':50 'call':4,23,82 'caller':107,235 'catalog':51 'categori':126,188 'classif':141 'clear':180 'connect':221 'content':227 'convers':158 'cost':77 'crawl':211 'crypto-paid API' 'data':11,30,127,131 'decim':91 'descript':194 'doc':212 'document':202,246 'embed':142 'enabl':44 'endpoint':16,35,57,67,125,161,174,232 'estim':152 'exampl':207 'exchang':147 'export':132 'feed':146 'financ':13,32,143 'four':124 'gas':151 'generat':159 'geocod':156 'handl':94 'header':114 'howev':171 'infrastructur':154 'insight':133 'json-response' 'key':101 'know':229 'land':191 'learn':136 'list':71,163 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':135 'map':181 'metric':129 'name':186 'network':64 'no-api-key' 'offer':10,29 'opaqu':241 'page':192,216 'paid':242 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,113,118 'per':3,22,55,81 'platform':6,25,46,122 'point':170 'premium':73,197 'premium API access' 'price':145,169,213 'probe':175 'prompt':223 'proof':119 'protocol':98 'provid':48 'publish':248 'quot':150 'rate':148 'readm':215 'report':130 'request':56 'request/response':203 'requir':106 'resourc':243 'return':218,234 'schema':204 'sentiment':137 'settl':58 'simpli':108,196 'specif':66,173 'subscript':104 'summar':140 'text':139 'token':149 'treat':237 'unit':86 'usag':206 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,155 'valid':117,157 'via':95 'wallet':222 'web3':144 'wider':121 'without':228 'x':112 'x-payment':111 'x402':43,97 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b62c9e61-6774-4077-8cc3-80a0051fe390","listingId":"a78875db-27d0-475a-a66d-0e3a64f82278","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/keys/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.641Z"}],"sources":[{"listingId":"a78875db-27d0-475a-a66d-0e3a64f82278","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.641Z","lastSeenAt":"2026-04-22T05:32:12.519Z"}],"details":{"listingId":"a78875db-27d0-475a-a66d-0e3a64f82278","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/79 \\\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 requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/keys/79"},{"claim":"The platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is the canonical USDC on Base with 6 decimals.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API resources without account signup or API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Exploring x402 protocol integration for pay-per-request microservices"],"bestFor":["Developers or agents wanting frictionless pay-per-call access without subscriptions","x402 protocol integrators looking for low-cost test endpoints","Crypto-native applications that settle in USDC on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume consumers seeking bulk pricing or rate-limited tiers","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.442Z"},"updatedAt":"2026-04-22T05:32:12.519Z"}}