{"id":"ca479547-0110-4eec-8368-9a96b1f5958b","shortId":"XhSU4P","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/189` is listed as \"Premium API Access\" and charges up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises four categories of endpoints: 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). All endpoints are listed at the same $0.02/request price point. Payment is accepted via the \"exact\" scheme on the Base L2 network, settling to a single payTo address in USDC (contract 0x8335…2913).\n\nNote that the specific functionality behind the `/api/v1/inbox/189` path is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) all resolve to a minimal \"Connect wallet\" prompt with no additional detail. Prospective callers should be aware that the actual behavior of this particular endpoint is unclear from available documentation.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","lowpaymentfee"],"warnings":["The specific functionality of /api/v1/inbox/189 ('Premium API Access') is not documented — it is unclear what this endpoint actually does.","No OpenAPI schema, request format, or response examples are available.","All non-homepage crawled pages (pricing, README, API) returned only a 'Connect wallet' prompt with no useful documentation.","The platform lists many endpoint categories but none have detailed docs visible without wallet authentication."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/189","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/189","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 OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/inbox/189 is undocumented. The crawled docs pages are essentially empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34,155 '0.02':16,33,76,154 '000':80 '0x8335':179 '20':79 '2913':180 '6':86 'accept':160 'access':71,198 'actual':235 'addit':226 'address':175 'advertis':109 'ai':10,27,121 'ai-inference' 'analysi':125 'analyt':115 'api':4,21,41,70,89,197,215 'attach':98 'avail':244 'awar':232 'base':7,24,59,81,167 'base usdc api' 'behavior':236 'behind':49,186 'beyond':193 'broader':107 'caller':96,229 'categori':111 'charg':73 'classif':128 'classification' 'connect':221 'contract':178 'convers':145 'crawl':210 'data':9,26,114,118 'data-analytics' 'decim':87 'detail':227 'doc':211 'document':192,245 'embed':129 'embeddings' 'endpoint':14,31,48,63,113,148,240 'estim':139 'exact':163 'exampl':207 'exchang':134 'export':119 'feed':133 'financ':11,28,130 'finance-data' 'four':110 'function':185 'gas':138 'gate':3,20,44 'generat':146 'generic':195 'geocod':143 'geocoding' 'header':102 'infrastructur':141 'insight':120 'key':90 'l2':168 'label':199 'learn':123 'limit':93 'list':67,150 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':122 'marketplac':42 'metric':116 'micropay':53 'micropayment api' 'minim':220 'network':60,169 'note':181 'offer':8,25 'openapi':203 'page':212 'particular':239 'path':189 'pay-per-request api' 'payment':101,158 'payto':174 'per':51,77 'per-request':50 'per-request-micropayment' 'platform':5,22,108 'point':157 'premium':69,196 'price':132,156,213 'prompt':223 'prospect':228 'protocol':40 'quot':137 'rate':92,135 'readm':214 'report':117 'request':52,78,105 'request/response':206 'requir':95 'resolv':217 'schema':204 'scheme':164 'sentiment':124 'sentiment-analysis' 'settl':54,170 'simpli':97 'singl':173 'specif':62,184 'summar':127 'text':126 'text-summarization' 'token':136 'unclear':242 'unit':82 'usdc':56,84,177 'usdc-base' 'util':13,30,142 'utility-apis' 'valid':144 'varieti':46 'via':161 'wallet':222 'web3':131 'x402':2,19,39,100 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"fb2ae83d-ad57-486e-8baf-6e27ccac59f5","listingId":"ca479547-0110-4eec-8368-9a96b1f5958b","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/189","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.688Z"}],"sources":[{"listingId":"ca479547-0110-4eec-8368-9a96b1f5958b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/189","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.688Z","lastSeenAt":"2026-04-22T07:32:23.240Z"}],"details":{"listingId":"ca479547-0110-4eec-8368-9a96b1f5958b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/189 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base (exact scheme)","source_url":"https://lowpaymentfee.com/api/v1/inbox/189"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure utility endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/189"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto gas estimates or token price quotes via micropayment","Geocoding or data validation as a utility service paid per call","Exporting analytics data or generating reports with no subscription commitment"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost micropayment APIs on Base","Web3-native applications that prefer on-chain payment settlement over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, schemas, or SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.616Z"},"updatedAt":"2026-04-22T07:32:23.240Z"}}