{"id":"3e2e50c5-87ae-4272-80c3-c11170bb45cb","shortId":"czmhug","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 variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/188` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises 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 (geocoding, validation, conversion, generation). Each of these is a separate endpoint, 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 detailed documentation for any endpoint. The x402 challenge is live and well-formed, confirming the endpoint accepts POST requests and pays out to a specified Ethereum address on Base. However, without documentation it is unclear what request body this particular endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","crypto api payments"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The purpose and expected input/output of /api/v1/charges/188 specifically is undocumented","Cannot verify what data or service any of the listed endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/188","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/charges/188","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and all doc pages render only 'Connect wallet'. The specific purpose of /api/v1/charges/188 ('Premium API Access') is not explained 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'/api/v1/charges/188':94 '/docs':172 '/pricing':174 '/readme':176 '/request':13,28 '0.02':12,27,62,113,164 '000':107 '20':106 'accept':216 'access':100 'across':45 'address':226 'advertis':118 'ai':128 'ai-inference' 'ai/ml':48 'analysi':132 'analyt':47,122 'api':5,20,37,72,99 'attach':82 'base':8,23,69,108,228 'base network api' 'base-network' 'bodi':237 'call':4,19,115 'caller':80 'categori':119 'challeng':206 'classif':135 'classification' 'confirm':213 'connect':182 'content':188 'convers':151 'crypto api payments' 'data':46,121,125 'data-analytics' 'detail':199 'document':167,200,231 'embed':136 'embeddings' 'enabl':36 'endpoint':44,55,92,159,203,215,240 'estim':146 'ethereum':225 'exampl':196 'exchang':141 'expect':241 'export':126 'extrem':169 'feed':140 'financ':137 'finance-data' 'finance/web3':50 'form':212 'gas':145 'generat':152 'geocod':149 'geocoding' 'header':86 'howev':229 'i.e':112 'includ':120 'infer':49 'infrastructur':52,148 'insight':127 'key':73 'learn':130 'limit':75 'list':96 'live':208 'low payment fee' 'lowpaymentfee.com':31 'machin':129 'maximum':104 'metric':123 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':192 'page':177 'particular':239 'pay':2,17,58,220 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':85 'per':3,18,59,114 'platform':6,21,38,117 'point':166 'post':217 'premium':98 'price':139,165 'prompt':184 'quot':144 'rate':74,142 'render':179 'report':124 'request':60,89,218,236 'request/response':195 'requir':79,102 'respons':244 'return':246 'schema':193 'sentiment':131 'sentiment-analysis' 'separ':158 'settl':64 'simpli':81 'spars':170 'specif':91 'specifi':224 'subscript':77 'summar':134 'text':133 'text-summarization' 'token':143 'unclear':234 'unit':109 'usdc':15,30,66,111 'usdc api' 'usdc-settlement' 'util':53 'valid':150 'varieti':42 'via':10,25 'wallet':183 'web3':138 'well':211 'well-form':210 'without':230 'x402':11,26,35,84,205 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"679c7362-2974-4f71-95aa-0f96776ef574","listingId":"3e2e50c5-87ae-4272-80c3-c11170bb45cb","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/charges/188","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:24.881Z"}],"sources":[{"listingId":"3e2e50c5-87ae-4272-80c3-c11170bb45cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/188","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:24.881Z","lastSeenAt":"2026-04-22T16:31:13.374Z"}],"details":{"listingId":"3e2e50c5-87ae-4272-80c3-c11170bb45cb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/188 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/188"},{"claim":"Payment settles to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/charges/188"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto quotes with per-request USDC micropayments","Using utility services like geocoding, validation, and data conversion on a pay-as-you-go basis","Building agent workflows that pay for API calls programmatically via x402"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle payments on Base via x402","Projects needing low-cost micropayment-gated endpoints without subscriptions"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume use cases where per-request pricing may not be cost-effective compared to bulk plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.463Z"},"updatedAt":"2026-04-22T16:31:13.374Z"}}