{"id":"46c213e4-78f8-408f-9990-f4aca636c338","shortId":"g9WjHN","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call 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 infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network, with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint `/api/v1/inbox/10` is listed as \"Premium API Access\" and accepts POST requests. Based on the x402 challenge, it charges up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/inbox/10` endpoint specifically returns or what input it expects beyond a POST with `application/json` content type. The platform is live (402 challenge confirmed), but without documentation it is difficult to know what data or functionality any given endpoint actually provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-json","data-analytics","ai-inference","finance-data","web3-data","geocoding","text-summarization","sentiment-analysis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or schema describing request/response formats for any endpoint","The specific purpose of /api/v1/inbox/10 ('Premium API Access') is unexplained","Cannot verify what data or functionality any endpoint actually returns","The broad catalog of endpoints (AI, finance, geo, etc.) is listed on the homepage but none have documented behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/10","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/10","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, but documentation is essentially nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what '/api/v1/inbox/10' actually does. The listing is effectively a 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'/call':13,28 '0.02':12,27,64,112,115,150 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':121 '20':106 '402':209 'accept':94 'access':92 'across':50 'actual':227 'address':120 'advertis':127 'ai-inference' 'ai/ml':53 'analysi':131 'analyt':52 'api':5,20,37,76,91,159 'application/json':202 'base':8,23,72,97,108,123 'base network api' 'beyond':198 'broad':42 'broader':125 'call':117 'catalog':43 'challeng':101,210 'charg':103 'classif':134 'confirm':211 'connect':168 'content':174,203 'convers':142 'data':51,144,221 'data-analytics' 'descript':185 'difficult':217 'doc':158 'document':153,214 'embed':135 'enabl':36 'endpoint':49,60,85,128,190,226 'exampl':182 'exchang':138 'expect':197 'export':145 'extrem':155 'feed':137 'finance-data' 'finance/web3':55 'function':223 'geocod':140 'geocoding' 'given':225 'i.e':114 'infer':54 'infrastructur':57 'input':195 'key':77 'know':219 'limit':79 'list':88 'live':208 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,73 'no-api-key' 'no-auth api' 'offer':40 'openapi':178 'page':163 'paid':67 'pay':2,17,46 'pay per call api' 'pay-per-request':1,16,45 'per':3,18,47,65,116 'platform':6,21,38,126,206 'point':152 'post':95,200 'post-json' 'premium':90 'price':62,136,151,160 'prompt':170 'provid':228 'rate':78,139 'readm':162 'render':165 'request':4,19,48,66,96 'request/response':181 'requir':82 'return':192 'schema':179 'sentiment':130 'sentiment-analysis' 'settl':118 'spars':156 'specif':84,191 'subscript':81 'summar':133 'text':132 'text-summarization' 'type':204 'unit':109 'usdc':15,30,69,111,113 'usdc api' 'usdc-base-network' 'util':58 'valid':141 'via':10,25 'wallet':169 'web3-data' 'without':213 'x402':11,26,35,100 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"61e21496-5d60-4178-ba47-634229ba1fed","listingId":"46c213e4-78f8-408f-9990-f4aca636c338","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.022Z"}],"sources":[{"listingId":"46c213e4-78f8-408f-9990-f4aca636c338","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.022Z","lastSeenAt":"2026-04-22T12:05:14.773Z"}],"details":{"listingId":"46c213e4-78f8-408f-9990-f4aca636c338","quickStartSnippet":"# x402 POST to the Premium API Access endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/inbox/10 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/10"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to AI inference (sentiment, summarization, classification, embeddings) at micro-payment scale","Fetching real-time finance data (prices, exchange rates, gas estimates) with per-call USDC payment","Geocoding, validation, and data conversion utilities paid per request"],"bestFor":["AI agents with x402-compatible wallets on Base","Developers wanting zero-commitment, pay-as-you-go API access","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime documentation","Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.747Z"},"updatedAt":"2026-04-22T12:05:14.773Z"}}