{"id":"79017a02-42ed-40d7-9e31-5a75add41681","shortId":"duMgg6","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 collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/inbox/187` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises 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 broader platform lists roughly 16 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 (geocoding, validation, conversion, generation) — all at the same $0.02 price point.\n\nDocumentation is minimal. The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what request body `/api/v1/inbox/187` expects or what response it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-api","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","low fee API","Base network API","crypto-paid API","serverless API marketplace"],"warnings":["No API documentation, OpenAPI spec, or request/response schemas available","The purpose and expected input of /api/v1/inbox/187 ('Premium API Access') is not described anywhere","All non-root crawled pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","Cannot verify what any of the listed endpoints actually return without documentation or example responses"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/187","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/187","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, confirming pricing and network. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/inbox/187 is entirely unclear. This is effectively a stub 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'/api/v1/inbox/187':95,235 '/pricing':188 '/readme':190 '/request':19,38 '0.02':18,37,126,179 '000':115 '0x8335':120 '16':138 '20':114 '2913':121 '402':224 '6':131 'Base network API' 'USDC micropayment API' 'accept':103 'access':101 'across':140 'advertis':109 'ai':12,31,56,150 'ai-inference' 'analysi':154 'analyt':55,144 'api':5,24,45,82,100 'avail':216 'base':8,27,75,116,123 'bodi':234 'broader':134 'call':4,23 'categori':142 'challeng':108,225 'classif':157 'classification' 'collect':50 'connect':196 'content':202 'convers':173 'cost':112 'crawl':186 'crypto-paid API' 'data':11,30,54,143,147 'data-analytics' 'decim':132 'document':182,211,228 'embed':158 'embeddings' 'enabl':44 'endpoint':16,35,52,65,93,139,218 'equal':125 'estim':168 'exampl':215 'exchang':163 'expect':236 'export':148 'feed':162 'financ':13,32,59,159 'finance-data' 'four':141 'gas':167 'generat':174 'geocod':171 'geocoding' 'host':48 'infrastructur':62,170 'insight':149 'key':83 'learn':58,152 'limit':86 'list':97,136 'live':220 'low fee API' 'lowpaymentfee.com':39 'machin':57,151 'maximum':111 'metric':145 'minim':184 'network':76 'no-api-key' 'offer':10,29 'openapi':206 'page':191 'paid':67 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'per':3,22,69,127 'per-request':68 'per-request-billing' 'platform':6,25,46,135 'point':181 'post':104 'post-api' 'premium':99 'price':161,180 'prompt':198 'proper':223 'protocol':80 'quot':166 'rate':85,164 'report':146 'request':70,105,128,233 'request/response':209 'requir':90 'respons':239 'return':193,221,241 'rough':137 'schema':210 'sentiment':153 'sentiment-analysis' 'serverless API marketplace' 'span':53 'spec':207 'specif':92 'subscript':89 'summar':156 'text':155 'text-summarization' 'token':165 'unclear':231 'unit':117 'usag':214 'usdc':9,28,72,119,129 'usdc-base' 'use':71,130 'util':15,34,63 'valid':172 'via':77 'wallet':197 'web3':60,160 'without':227 'x402':43,79,107 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"9b6ac996-907f-4c29-8da4-b2b954adf302","listingId":"79017a02-42ed-40d7-9e31-5a75add41681","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/187","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.533Z"}],"sources":[{"listingId":"79017a02-42ed-40d7-9e31-5a75add41681","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/187","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.533Z","lastSeenAt":"2026-04-22T04:02:45.950Z"}],"details":{"listingId":"79017a02-42ed-40d7-9e31-5a75add41681","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/187 \\\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 lists ~16 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/187 specifies maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/187"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/187"}],"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 crypto micropayments","Integrating pay-as-you-go analytics and data export into agent workflows"],"bestFor":["Agents or developers who want keyless, pay-per-call API access settled in USDC on Base","Projects needing low-cost ($0.02) micropayment-gated endpoints without subscriptions","Web3-native applications that prefer on-chain payment over traditional billing"],"notFor":["Users who need detailed API documentation, schemas, or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.235Z"},"updatedAt":"2026-04-22T04:02:45.950Z"}}