{"id":"e0dc6aba-2ab1-420c-a3c1-1916ed55783b","shortId":"SsDJJy","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that hosts a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/inbox/95` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe platform advertises four categories of APIs: 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 utilities (geocoding, validation, conversion, generation). However, the specific functionality behind the `/api/v1/inbox/95` path is not documented — the generic \"Premium API Access\" label provides no detail on what data or service this particular endpoint returns. No OpenAPI schema, request/response examples, or detailed documentation were found.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method"],"categories":["api-platform","data","llm","finance","utility"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-call API","USDC API","Base network API"],"warnings":["No documentation found for the specific endpoint /api/v1/inbox/95 — its actual functionality is unknown","No OpenAPI or schema definition available for any endpoint on the platform","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","The 'Premium API Access' label is generic and does not describe what the endpoint returns","Multiple endpoint categories are advertised but none have documented request/response formats"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/95","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/95","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for what /api/v1/inbox/95 actually does, no OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The generic 'Premium API Access' label is 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'/request':19,38 '0.02':18,37,70,130 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '20':124 '300':148 '402':119 '6':135 'Base network API' 'USDC API' 'accept':153 'access':115,214 'address':144 'advertis':161 'ai':12,31,173 'ai/ml':57 'analysi':177 'analyt':56,167 'api':5,24,45,87,114,165,213 'application/json':158 'attach':98 'base':8,27,78,126,138 'behind':203 'broad':50 'call':4,23 'caller':96 'categori':163 'challeng':120 'classif':180 'collect':51 'commit':95 'convers':197 'data':11,30,55,60,166,170,221 'decim':136 'detail':218,234 'document':209,235 'embed':181 'enabl':44 'endpoint':16,35,53,66,108,152,226 'estim':191 'everi':65 'exampl':232 'exchang':186 'export':171 'feed':185 'financ':13,32,182 'finance/web3':59 'found':237 'four':162 'function':202 'gas':190 'general':62 'generat':198 'generic':211 'geocod':195 'header':102 'host':48 'howev':199 'infer':58 'infrastructur':193 'insight':172 'json-api' 'key':88 'label':215 'learn':175 'limit':91 'list':111 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':174 'metric':168 'micropayment API' 'minimum':94 'network':79 'offer':10,29 'openapi':229 'paid':73 'particular':225 'path':206 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':101,140 'per':3,22,71 'platform':6,25,46,160 'post':154 'post-method' 'premium':113,212 'price':68,184 'protocol':83 'provid':216 'quot':189 'rate':90,187 'report':169 'request':72,105,121,155 'request/response':231 'return':117,157,227 'schema':230 'second':149 'sentiment':176 'servic':64,223 'settl':142 'simpli':97 'sinc':132 'span':54 'specif':107,201 'summar':179 'text':178 'timeout':150 'token':188 'unit':127 'usd':131 'usdc':9,28,75,129,133 'usdc-base' 'use':134 'util':15,34,63,194 'valid':196 'via':80 'web3':183 'x402':43,82,100 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"8aef4f73-c773-46e7-8e70-76e7330f6d22","listingId":"e0dc6aba-2ab1-420c-a3c1-1916ed55783b","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/95","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.684Z"}],"sources":[{"listingId":"e0dc6aba-2ab1-420c-a3c1-1916ed55783b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/95","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.684Z","lastSeenAt":"2026-04-22T04:02:46.106Z"}],"details":{"listingId":"e0dc6aba-2ab1-420c-a3c1-1916ed55783b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/95 \\\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":"The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $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 x402 challenge for /api/v1/inbox/95 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/95"}],"useCases":["Accessing data analytics and reports on a per-request payment basis","Running AI inference tasks (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto market quotes","Using utility services like geocoding, validation, and conversion with instant pay-as-you-go pricing","Integrating agent-driven workflows that settle payments automatically via x402"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost ($0.02) micro-transactions for API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.056Z"},"updatedAt":"2026-04-22T04:02:46.106Z"}}