{"id":"e7077685-cbc6-48c6-87a7-6e41db01c655","shortId":"UjhECd","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol, with no API keys, rate limits, or upfront commitments required.\n\nThe specific endpoint at `/api/v1/charges/32` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises a uniform $0.02/request price across all its endpoints.\n\nThe broader platform lists endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages only show a \"Connect wallet\" prompt), so the actual functionality, request formats, and response schemas for these endpoints are not documented in any accessible way.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee"],"warnings":["All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no actual content.","No OpenAPI or schema available — request and response formats are completely undocumented.","The specific purpose of /api/v1/charges/32 ('Premium API Access') is unclear; it does not match any of the named endpoints on the landing page.","Cannot verify that any of the advertised AI, finance, or utility endpoints actually function as described."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/32","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/32","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and all doc pages are empty. The actual functionality behind 'Premium API Access' at /api/v1/charges/32 is undefined — it's unclear what this specific endpoint does versus the other listed 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'/request':19,38,139 '0.02':18,37,126,138 '000':115 '0x8335':120 '20':114 '2913':121 '6':131 'accept':103 'access':101,210 'across':141 'actual':195 'advertis':135 'ai':12,31 'ai-inference' 'ai/ml':56 'analysi':157 'analyt':55 'api':5,24,45,83,100 'base':8,27,75,116,123 'base usdc api' 'beyond':177 'broader':146 'call':4,23 'challeng':108 'classif':160 'classification' 'collect':50 'commit':89 'connect':190 'convers':172 'cost':112 'crypto-data' 'data':11,30,54,59,153 'data-analytics' 'decim':132 'doc/pricing/api':185 'document':176,207 'embed':161 'embeddings' 'empti':183 'enabl':44 'endpoint':16,35,52,65,93,144,149,204 'equal':125 'essenti':182 'estim':169 'exchang':164 'export':154 'feed':163 'financ':13,32 'finance-data' 'finance/web3':58 'format':198 'function':196 'gas':168 'general':61 'generat':174 'geocod':170 'geocoding' 'howev':175 'indic':109 'infer':57 'insight':155 'key':84 'land':179 'limit':86 'list':97,148 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'maximum':111 'metric':151 'micropayment api' 'network':76 'offer':48 'page':180,186 'paid':67 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'per':3,22,69,127 'per-request':68 'per-request-billing' 'platform':6,25,46,134,147 'post':104 'premium':99 'price':140,162 'prompt':192 'protocol':80 'quot':167 'rate':85,165 'report':152 'request':70,105,128,197 'requir':90 'respons':200 'schema':201 'sentiment':156 'sentiment-analysis' 'servic':63 'show':188 'span':53 'specif':92 'summar':159 'text':158 'text-summarization' 'token':166 'uniform':137 'unit':117 'upfront':88 'usdc':72,119,129 'usdc-base' 'use':71,130 'util':15,34,62 'utility-services' 'valid':171 'via':9,28,77 'wallet':191 'way':211 'x402':10,29,43,79,107 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b71783d4-edce-45db-867f-46c56b701887","listingId":"e7077685-cbc6-48c6-87a7-6e41db01c655","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:56.242Z"}],"sources":[{"listingId":"e7077685-cbc6-48c6-87a7-6e41db01c655","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:56.242Z","lastSeenAt":"2026-04-23T08:01:17.725Z"}],"details":{"listingId":"e7077685-cbc6-48c6-87a7-6e41db01c655","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/32 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoints span data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/32"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/32"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates via micropayment","Running geocoding or data validation calls with per-request USDC billing on Base"],"bestFor":["Developers or agents wanting zero-setup, keyless API access via x402","Low-volume or bursty workloads where per-call pricing avoids subscription overhead","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where $0.02/call adds up quickly compared to subscription APIs","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.049Z"},"updatedAt":"2026-04-23T08:01:17.725Z"}}