{"id":"8b4adc6a-35eb-4237-9d70-793cc2f008a0","shortId":"qef57W","kind":"x402","title":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","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 infrastructure utilities. Every call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, rate limits, or upfront commitments.\n\nThe specific endpoint `/api/v1/inbox/162` is listed as \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" payment scheme. The endpoint accepts HTTP 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 per request price point. However, the specific functionality behind the `/api/v1/inbox/162` path is not documented beyond the generic \"Premium API Access\" label, so its exact behavior is unclear.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee"],"warnings":["The exact functionality of /api/v1/inbox/162 is unknown — 'Premium API Access' is not a meaningful description of what the endpoint does or returns.","No OpenAPI spec, no request/response schema, and no documentation pages were available.","The broader site lists many endpoint categories but none match the /api/v1/inbox/162 path, raising questions about what this specific endpoint provides.","Pricing and /README pages returned no content beyond 'Connect wallet'."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/162","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/inbox/162","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 challenge, but there is no documentation, no OpenAPI schema, no example request/response, and the specific functionality of /api/v1/inbox/162 is entirely undescribed beyond the generic label 'Premium API Access'. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/call':13,30 '0.02':12,29,66,111,171 '000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':126 '20':105 '6':116 'accept':134 'access':95,192 'across':54 'address':125 'advertis':144 'ai/ml':57 'analysi':148 'analyt':56 'api':5,15,22,32,41,79,94,191 'application/json':140 'base':8,25,71,107,119 'base usdc api' 'behavior':197 'behind':180 'beyond':187 'broad':46 'broader':142 'call':64 'catalog':47 'chain':76 'challeng':101 'classif':151 'commit':85 'convers':163 'cost':65 'data':55,165 'decim':117 'document':186 'embed':152 'enabl':40 'endpoint':53,88,133,145 'estim':160 'everi':63 'exact':129,196 'exchang':155 'feed':154 'finance/web3':59 'function':179 'gas':159 'generat':166 'generic':189 'geocod':161 'howev':176 'http':135 'http-post' 'infer':58 'infrastructur':61 'json-response' 'key':16,33,80 'label':193 'limit':82 'list':91 'live':99 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'made':123 'micropayment api' 'network':72 'no-api-key' 'offer':44 'on-chain':74 'path':183 'pay':2,19,50 'pay per call api' 'pay-per-request':1,18,49 'payment':121,130 'per':3,20,51,172 'platform':6,23,42,143 'point':175 'post':136 'premium':93,190 'price':153,174 'quot':158 'rate':81,156 'request':4,21,52,102,137,173 'requir':17,34 'return':97,139 'scheme':131 'sentiment':147 'settl':73 'sinc':113 'specif':87,178 'summar':150 'text':149 'token':157 'unclear':199 'unit':108 'upfront':84 'usd':112 'usdc':9,26,68,110,114 'usdc-base' 'use':115,127 'util':62 'valid':162 'via':10,27 'x402':11,28,39,100 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"8889a6a1-a347-4b0c-be11-b4c87302afe2","listingId":"8b4adc6a-35eb-4237-9d70-793cc2f008a0","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/inbox/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.748Z"}],"sources":[{"listingId":"8b4adc6a-35eb-4237-9d70-793cc2f008a0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/162","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.748Z","lastSeenAt":"2026-04-22T13:32:23.671Z"}],"details":{"listingId":"8b4adc6a-35eb-4237-9d70-793cc2f008a0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/162 \\\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 live x402 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/162"},{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/162"}],"useCases":["Accessing pay-per-request API services without needing API keys or subscriptions","Making on-chain micropayments for individual API calls on Base","Agent-driven workflows that need low-friction, per-call billing"],"bestFor":["Developers wanting zero-commitment, per-request API billing","AI agents that can settle x402 payments autonomously on Base","Projects needing instant API access without signup or rate limits"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing at $0.02 may be expensive compared to bulk plans","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.492Z"},"updatedAt":"2026-04-22T13:32:23.671Z"}}