{"id":"2f716093-7352-43e3-90eb-05d1f6736f08","shortId":"Qcc4Ep","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 an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint at `/api/v1/payments/115` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USDC, i.e., $0.02). Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact payment scheme. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive technical documentation, so the actual behavior and response schemas of these endpoints remain unverified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-platform","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, and README pages all return only 'Connect wallet' with no content.","The purpose and response schema of /api/v1/payments/115 ('Premium API Access') is not described anywhere.","No OpenAPI spec or input/output schema provided beyond the x402 challenge metadata.","The broad catalog of endpoints listed on the homepage is unverified — none were individually probed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/115","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/115","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are all empty beyond a wallet connect prompt. The actual functionality behind 'Premium API Access' is 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'/request':13,28 '0.02':12,27,64,110,113,166 '000':105 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':122 '20':104 'accept':130 'access':93 'across':50 'actual':188 'address':121 'advertis':139 'ai/ml':53 'analysi':143 'analyt':52 'api':5,20,37,76,92 'application/json':135 'base':8,23,72,106 'base network api' 'behavior':189 'broad':42 'broader':137 'call':4,19 'catalog':43 'chain':119 'challeng':99 'classif':146 'connect':178 'convers':158 'data':51,160 'doc':172 'document':170,185 'embed':147 'enabl':36 'endpoint':49,60,85,129,140,195 'estim':155 'exact':125 'exchang':150 'feed':149 'finance/web3':55 'gas':154 'generat':161 'geocod':156 'howev':169 'i.e':112 'infer':54 'json-api' 'key':77 'limit':79 'list':89 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':102 'micropayment api' 'network':9,24,73 'no-api-key' 'no-rate-limit' 'offer':40 'on-chain':117 'page':171 'pay':2,17,46 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':45 'payabl':67 'payment':114,126 'per':3,18,47,65 'platform':6,21,38,138 'point':168 'post':131 'post-method' 'premium':91 'price':62,148,167,173 'prompt':180 'quot':153 'rate':78,151 'readm':174 'remain':196 'request':48,66,132 'requir':82 'respons':191 'return':95,134,175 'schema':192 'scheme':127 'sentiment':142 'servic':58 'settl':116 'specif':84 'subscript':81 'substant':183 'summar':145 'technic':184 'text':144 'token':152 'unit':107 'unverifi':197 'usdc':15,30,69,109,111 'usdc api' 'usdc-base' 'use':123 'util':57 'valid':97,157 'via':10,25 'wallet':179 'x402':11,26,35,98 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e1f40224-2cb9-4216-b531-5c910fb712f5","listingId":"2f716093-7352-43e3-90eb-05d1f6736f08","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/payments/115","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:27.531Z"}],"sources":[{"listingId":"2f716093-7352-43e3-90eb-05d1f6736f08","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/115","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:27.531Z","lastSeenAt":"2026-04-24T09:32:19.382Z"}],"details":{"listingId":"2f716093-7352-43e3-90eb-05d1f6736f08","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/115 \\\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":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/115"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/115"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents needing keyless pay-per-use API access","Users who want to avoid subscriptions and pay only per request"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where per-call pricing may add up compared to subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.799Z"},"updatedAt":"2026-04-24T09:32:19.382Z"}}