{"id":"97113aa5-432c-47c5-aa51-4c2d84bab38b","shortId":"trgu8r","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, 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, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/inbox/46` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02. Payment is made via an X-PAYMENT header on each POST request. The endpoint accepts and returns application/json.\n\nNote that while the landing page advertises many endpoints, the crawled documentation pages (pricing, README, API docs) all resolve to a minimal \"Connect wallet\" page with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the site itself. The actual behavior and data returned by this specific inbox endpoint — and indeed most listed endpoints — is unclear from the available material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","validation","conversion","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/inbox/46 has no documented input/output schema — its actual functionality is unknown","All documentation pages beyond the landing page resolve to a minimal 'Connect wallet' stub","The catalog lists many endpoints but none have detailed docs; actual availability and behavior are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/46","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/46","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 challenge, and the landing page lists a catalog of endpoints with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond the landing page, and no examples. The purpose of '/api/v1/inbox/46' specifically is entirely opaque — 'Premium API Access' is a generic label. Most doc pages just show 'Connect 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'/request':19,38 '0.02':18,37,94,149 '000':139 '0x8335':144 '20':138 'Base network API' 'USDC API' 'accept':165 'access':127 'across':54 'actual':218 'advertis':175 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':58 'api':5,24,45,109,126,184 'application/json':168 'avail':212,237 'base':8,27,102,140,146 'behavior':219 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':133 'classif':70 'classification' 'commit':117 'connect':191 'convers':87 'conversion' 'crawl':179 'crypto-paid API' 'data':11,30,57,221 'data-analytics' 'detail':198 'doc':185 'document':180,207 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,53,90,120,164,177,227,232 'equal':148 'estim':81 'exampl':211 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-data' 'four':55 'gas':80 'generat':88 'geocod':85 'geocoding' 'header':158 'inbox':226 'inde':229 'infrastructur':83 'insight':62 'key':110 'land':173 'learn':65 'limit':113 'list':123,231 'low fee API' 'lowpaymentfee.com':39 'machin':64 'made':152 'mani':176 'materi':238 'maxamountrequir':136 'metric':59 'micropayment API' 'minim':190 'network':103 'no-api-key' 'note':169 'offer':10,29 'openapi':202 'page':174,181,193 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payabl':97 'payment':150,157 'per':3,22,95 'per-request-billing' 'platform':6,25,46 'post':161 'premium':125 'price':74,92,182 'protocol':107 'quot':79 'rate':77,112 'readm':183 'report':60 'request':96,162 'request/response':205 'resolv':187 'return':129,167,222 'schema':206 'sentiment':66 'sentiment-analysis' 'site':215 'spec':203 'specif':119,225 'summar':69 'technic':197 'text':68 'text-summarization' 'token':78 'unclear':234 'unit':141 'upfront':116 'usag':210 'usdc':9,28,99,143 'usdc-base' 'util':15,34,84 'valid':86,131 'validation' 'via':104,153 'wallet':192 'web3':73 'x':156 'x-payment':155 'x402':43,106,132 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e5c65624-8999-40f9-8260-df9c6946b835","listingId":"97113aa5-432c-47c5-aa51-4c2d84bab38b","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.987Z"}],"sources":[{"listingId":"97113aa5-432c-47c5-aa51-4c2d84bab38b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.987Z","lastSeenAt":"2026-04-22T04:02:46.430Z"}],"details":{"listingId":"97113aa5-432c-47c5-aa51-4c2d84bab38b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/46 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/46"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/46"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto gas estimates or token price quotes with per-call payment","Geocoding or data validation as a utility microservice paid in USDC","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["AI agents and bots that can pay per-call via x402 on Base","Developers who want keyless, commitment-free access to utility APIs","Web3-native applications that prefer on-chain USDC micropayments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.656Z"},"updatedAt":"2026-04-22T04:02:46.430Z"}}