{"id":"94aa5a1e-f670-405b-b32c-694e1406a02b","shortId":"FGhMkF","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network 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 at /api/v1/payments/221 is labeled \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted instantly upon payment.\n\nThe broader platform advertises multiple API categories including 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 $0.02 per request. However, the specific endpoint probed (/api/v1/payments/221) is described only as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this particular endpoint actually does or what parameters it accepts.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for this endpoint","The endpoint description 'Premium API Access' is generic and does not explain what data or functionality is returned","Cannot verify what the endpoint actually does without paying for a request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/221","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/payments/221","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 402 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 label. The docs pages are empty (just 'Connect wallet'). It is unclear what this specific endpoint actually 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'/api/v1/payments/221':57,168 '/docs':192 '/pricing':194 '/readme':196 '/request':13,28 '0.02':12,27,93,160 '000':82 '0x8335':87 '20':81 '2913':88 '6':98 'Base network API' 'USDC micropayment API' 'accept':46,64,232 'access':62,108,175 'actual':226 'advertis':107,117 'ai':129 'analysi':133 'analyt':123 'api':5,20,38,61,101,119,174 'base':8,23,51,83,90 'broader':115 'call':4,19,95 'categori':120 'challeng':76 'classif':136 'connect':202 'content':208 'convers':153 'data':122,126,182 'decim':99 'describ':170 'descript':220 'detail':219 'document':179,187 'embed':137 'endpoint':55,156,166,225 'equal':92 'estim':147 'exact':72 'exampl':216 'exchang':142 'export':127 'extrem':189 'feed':141 'financ':138 'function':184 'gas':146 'generat':154 'geocod':151 'grant':110 'howev':163 'includ':121 'indic':77 'infrastructur':149 'insight':128 'instant':111 'key':102 'label':59 'learn':131 'limit':105 'list':158 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':130 'maxamountrequir':79 'metric':124 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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/payments/221","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:47.935Z"}],"sources":[{"listingId":"94aa5a1e-f670-405b-b32c-694e1406a02b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/221","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:47.935Z","lastSeenAt":"2026-04-24T05:32:16.944Z"}],"details":{"listingId":"94aa5a1e-f670-405b-b32c-694e1406a02b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/221 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/221"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/221"},{"claim":"All endpoints listed at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-request API without needing API keys or subscriptions","Agent-driven API consumption with automatic USDC micropayments on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that need keyless, pay-as-you-go API access on Base","Low-cost per-request API consumption without commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet","Use cases requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.892Z"},"updatedAt":"2026-04-24T05:32:16.944Z"}}