{"id":"fd9bcb8e-e2f8-441d-a022-9d832930ebf8","shortId":"aUHTVa","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, no API keys required.","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/products/27` is listed as \"Premium API Access\" and returns an x402 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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/products/27`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that title. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Callers should be aware that the endpoint's concrete behavior is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no content.","The specific behavior and response format of /api/v1/products/27 ('Premium API Access') is undocumented and unclear.","No OpenAPI spec or request/response schema provided.","No examples of successful responses are available to verify endpoint functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/27","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/products/27","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, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic title. The docs pages are empty (wallet-connect only). The actual functionality of /api/v1/products/27 is 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'/call':13,32 '0.02':12,31,86,161 '000':80 '20':79 'accept':54 'access':70,100,172 'across':120 'actual':175 'advertis':91 'ai':130 'analysi':134 'analyt':124 'api':5,17,24,36,46,69,93,171,198 'attach':103 'avail':227 'awar':217 'base':8,27,59,81 'base network api' 'behavior':223 'beyond':180 'broader':116 'call':88 'caller':101,214 'categori':122 'challeng':75 'classif':137 'concret':222 'connect':207 'content':213 'convers':154 'crawl':195 'data':123,127 'detail':189 'doc':197 'document':179,190 'embed':138 'endpoint':63,119,157,166,220 'estim':148 'exampl':187 'exchang':143 'export':128 'feed':142 'financ':139 'found':192 'four':121 'function':176 'gas':147 'generat':155 'geocod':152 'header':108 'http-post' 'i.e':85 'infrastructur':150 'insight':129 'instant':99 'key':18,37,94 'label':169 'learn':132 'limit':97 'list':66 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':131 'materi':228 'metric':125 'micropayment api' 'network':9,28,60 'no-api-key' 'offer':118 'openapi':184 'page':202 'particular':165 'pay':2,21,43 'pay per call api' 'pay-per-request':1,20,42 'payment':56,107,113 'per':3,22,44,87,162 'platform':6,25,47,90,117 'premium':68,170 'price':141,159,199 'prompt':209 'proof':114 'protocol':52 'quot':146 'rate':96,144 'readm':201 'report':126 'request':4,23,45,76,163 'request/response':186 'requir':19,38 'return':72,204 'schema':185 'sentiment':133 'simpli':102 'specif':62 'substant':212 'summar':136 'text':135 'titl':182 'token':145 'unclear':225 'unit':82 'usdc':15,34,55,84 'usdc api' 'usdc-base-network' 'use':49 'util':151 'valid':111,153 'via':10,29 'wallet':208 'web3':140 'x':106 'x-payment':105 'x402':11,30,51,74,112 'x402 api' 'x402-payment'","prices":[{"id":"1710d6c9-9efe-4313-938e-11856962889a","listingId":"fd9bcb8e-e2f8-441d-a022-9d832930ebf8","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/products/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:30.517Z"}],"sources":[{"listingId":"fd9bcb8e-e2f8-441d-a022-9d832930ebf8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:30.517Z","lastSeenAt":"2026-04-23T20:01:31.972Z"}],"details":{"listingId":"fd9bcb8e-e2f8-441d-a022-9d832930ebf8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/27 \\\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 ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/27"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/27"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents needing keyless API access with crypto micropayments","Users who want pay-per-use pricing without subscriptions or commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:01:02.774Z"},"updatedAt":"2026-04-23T20:01:31.972Z"}}