{"id":"96d2ae66-a9ec-43e8-8b62-784f246b5790","shortId":"C8kRWH","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/18` is listed as \"Premium API Access\" and returns JSON content. The x402 challenge indicates a max cost of 20,000 base units of USDC (0.02 USD per request), consistent with the site's advertised $0.02/request pricing across all endpoints.\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 uniformly at $0.02 per request.\n\nThe platform advertises no API keys, no rate limits, and instant access. Payment is handled entirely through the x402 protocol — callers send a payment proof in the X-PAYMENT header with each request. The endpoint accepts POST requests and settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. However, the specific functionality of the `/api/v1/products/18` endpoint is unclear — the description is generic (\"Premium API Access\") and no documentation, request schema, or response schema is available beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, pricing, and README pages all render only a 'Connect wallet' prompt with no content","The specific functionality of /api/v1/products/18 ('Premium API Access') is undefined; it does not map to any of the named endpoints on the landing page","No request or response schema provided; callers cannot know what to send or expect back","No OpenAPI spec or AI plugin manifest available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/18","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for what /api/v1/products/18 actually returns, no request/response schema, and the crawled docs/pricing/README pages are all blank beyond a 'Connect wallet' prompt. The specific functionality of this endpoint is 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'/call':13,32 '/request':100 '0.02':12,31,89,99,152 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':199 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':202 '20':83 'Base network API' 'USDC API' 'accept':54,191 'access':70,166,221 'across':102,110 'address':198 'advertis':98,157 'ai':120 'analysi':124 'analyt':114 'api':5,17,24,36,46,69,159,220 'avail':231 'base':8,27,59,85,204 'beyond':232 'broader':106 'caller':175 'categori':112 'challeng':77,235 'classif':127 'consist':93 'content':74 'convers':144 'cost':81 'data':113,117 'descript':216 'document':224 'embed':128 'endpoint':63,104,109,147,190,212 'entir':170 'estim':138 'exchang':133 'export':118 'feed':132 'financ':129 'four':111 'function':208 'gas':137 'generat':145 'generic':218 'geocod':142 'handl':169 'header':185 'howev':205 'indic':78 'infrastructur':140 'insight':119 'instant':165 'json':73 'json-response' 'key':18,37,160 'learn':122 'limit':163 'list':66 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':121 'max':80 'metadata':236 'metric':115 'micropayment API' 'network':9,28,60 'no-api-key' 'offer':108 'pay':2,21,43 'pay per call API' 'pay-per-request':1,20,42 'payment':56,167,178,184,196 'per':3,22,44,91,153 'platform':6,25,47,107,156 'post':192 'post-method' 'premium':68,219 'premium API access' 'price':101,131,149 'proof':179 'protocol':52,174 'quot':136 'rate':134,162 'report':116 'request':4,23,45,92,154,188,193,225 'requir':19,38 'respons':228 'return':72 'schema':226,229 'send':176 'sentiment':123 'settl':195 'site':96 'specif':62,207 'summar':126 'text':125 'token':135 'unclear':214 'uniform':150 'unit':86 'usd':90 'usdc':15,34,55,88,201 'usdc-base' 'use':49,200 'util':141 'valid':143 'via':10,29 'web3':130 'x':183 'x-payment':182 'x402':11,30,51,76,173,234 'x402 API' 'x402-payment'","prices":[{"id":"812810a5-b3dd-489b-93fd-03dbab1cc06b","listingId":"96d2ae66-a9ec-43e8-8b62-784f246b5790","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:04.816Z"}],"sources":[{"listingId":"96d2ae66-a9ec-43e8-8b62-784f246b5790","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:04.816Z","lastSeenAt":"2026-04-23T19:00:37.234Z"}],"details":{"listingId":"96d2ae66-a9ec-43e8-8b62-784f246b5790","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/18 \\\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 maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/18"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/18"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless pay-per-use API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.789Z"},"updatedAt":"2026-04-23T19:00:37.234Z"}}