{"id":"dd2025b9-641e-4a67-a382-5342a04b6b47","shortId":"9xqAKS","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 exposes a broad catalog of endpoints across four categories: 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, no subscriptions.\n\nThe specific endpoint `/api/v1/inbox/23` is listed as \"Premium API Access\" and returns a valid x402 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the `exact` scheme to the specified wallet address. The endpoint accepts HTTP POST and returns `application/json`.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual functionality behind `/api/v1/inbox/23` is unclear; the description \"Premium API Access\" is generic and does not specify what data or service is returned. Prospective users should be aware that without documented input/output schemas, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay per call API","x402 API","USDC API","micropayment API","Base network API","lowpaymentfee","low payment fee","serverless API","no-auth API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/inbox/23 has only a generic 'Premium API Access' description — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) resolve to a wallet-connect prompt with no content","No request or response examples are available; integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/23","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and the specific purpose of /api/v1/inbox/23 ('Premium API Access') is undefined. The /api, /pricing, and /README pages are effectively empty. This is essentially a stub 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'/api/v1/inbox/23':120,219 '/pricing':181 '/readme':183 '/request':19,38 '0.02':18,37,95,143 '000':138 '20':137 '402':132 '6':148 'Base network API' 'USDC API' 'accept':166 'access':126,226 'across':54 'actual':216 'addit':195 'address':163 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,125,225 'application/json':171 'avail':210 'awar':243 'base':8,27,103,139,151 'behind':218 'beyond':173 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':133 'classif':71 'classification' 'connect':191 'contact':253 'content':196 'convers':88 'crawl':213 'data':11,30,57,61,234 'data-analytics' 'decim':149 'descript':223 'document':172,205,246 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,119,165 'estim':82 'exact':157 'exampl':209 'exchang':77 'exchange-rates' 'experiment':251 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':217 'gas':81 'generat':89 'generic':228 'geocod':86 'geocoding' 'http':167 'infrastructur':84 'input/output':247 'insight':63 'integr':249 'key':111 'land':175 'learn':66 'limit':114 'list':122 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':154 'materi':214 'metric':59 'micropayment API' 'network':104 'no-auth API' 'offer':10,29 'openapi':200 'page':176,184 'paid':98 'pay':2,21 'pay per call API' 'pay-per-cal':1,20 'pay-per-request' 'payment':152 'per':3,22,96 'platform':6,25,46 'post':168 'premium':124,224 'price':75,93 'prompt':192 'prospect':239 'protocol':108 'provid':255 'quot':80 'rate':78,113 'report':60 'request':97,134 'request/response':203 'requir':250 'resolv':186 'return':128,170,238 'schema':204,248 'scheme':158 'sentiment':67 'sentiment-analysis' 'serverless API' 'servic':236 'sinc':145 'spars':178 'spec':201 'specif':118 'specifi':161,232 'subscript':116 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':221 'unit':140 'usag':208 'usd':144 'usdc':9,28,100,142,146 'usdc-base' 'use':147 'user':240 'util':15,34,85 'utility-apis' 'valid':87,130 'via':105,155 'wallet':162,190 'wallet-connect':189 'web3':74 'without':245 'x402':43,107,131 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"85aaecc1-9cf6-4480-8f17-c67c07ec6e51","listingId":"dd2025b9-641e-4a67-a382-5342a04b6b47","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.789Z"}],"sources":[{"listingId":"dd2025b9-641e-4a67-a382-5342a04b6b47","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.789Z","lastSeenAt":"2026-04-22T04:02:46.219Z"}],"details":{"listingId":"dd2025b9-641e-4a67-a382-5342a04b6b47","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/23 \\\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 endpoint returns a valid x402 402 challenge requesting 20,000 base units of USDC on Base (scheme: exact)","source_url":"https://lowpaymentfee.com/api/v1/inbox/23"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/23"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) on a per-call basis","Running utility operations (geocoding, validation, conversion) with instant pay-per-use billing","Integrating agent-driven workflows that settle payments automatically via x402 on Base"],"bestFor":["AI agents that need frictionless, keyless API access with crypto micropayments","Developers prototyping with multiple API categories without subscription commitments","Web3-native applications that can settle USDC payments on Base"],"notFor":["Users who need detailed API documentation and guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.888Z"},"updatedAt":"2026-04-22T04:02:46.219Z"}}