{"id":"77e04c58-9e22-4853-a591-1bc266daa56b","shortId":"y8HGvz","kind":"x402","title":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.","tagline":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.","description":"lowpaymentfee.com hosts a suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is gated by an x402 payment challenge: callers attach a USDC payment on the Base network in the X-PAYMENT header and receive the response immediately — no API keys, no accounts, no rate limits.\n\nThe specific endpoint at `/api/v1/collections/30` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. The site's landing page confirms a flat $0.02/request pricing model across all endpoints.\n\nThe broader platform offers endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages beyond the landing page were largely empty (showing only \"Connect wallet\"), so detailed request/response schemas, parameter descriptions, and example payloads are not available. The endpoint is live and returning a valid x402 challenge.","tags":[],"capabilities":["x402-payment-gated","per-request-pricing","usdc-base-network","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","low fee API","Base network API","crypto-paid API","serverless API marketplace"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or JSON schema available — request parameters and response format are unknown.","The specific purpose of /api/v1/collections/30 ('Premium API Access') is unclear; it may be a bundle or alias for other endpoints.","No information on uptime guarantees, error handling, or data freshness."],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/30","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/collections/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, documentation pages are effectively empty, there is no OpenAPI spec, no request/response schema, and no example payloads. The 'collections/30' path is opaque — it's unclear what this specific collection endpoint actually returns versus the individually named endpoints on the landing 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'/request':142 '0.02':9,25,130,141,182 '000':117 '0x8335':122 '20':116 '2913':123 '6':126 'Base network API' 'USDC micropayment API' 'accept':105 'access':103 'account':89 'across':145 'advertis':111 'ai-inference' 'ai/ml':49 'amount':114 'analysi':160 'analyt':48 'api':4,20,45,86,102 'attach':66 'avail':209 'base':7,23,72,118,125 'beyond':187 'broader':149 'call':44 'caller':65 'challeng':64,110,219 'classif':163 'classification' 'collect':5,21 'confirm':138 'connect':196 'convers':175 'crypto-data' 'crypto-paid API' 'data':47,52,156 'data-analytics' 'decim':127 'descript':203 'detail':199 'document':185 'embed':164 'embeddings' 'empti':193 'endpoint':57,95,147,152,211 'equal':129 'estim':172 'everi':56 'exampl':205 'exchang':167 'export':157 'feed':166 'finance-data' 'finance/web3':51 'flat':140 'gas':171 'gate':3,19,59 'generat':177 'geocod':173 'geocoding' 'header':79 'host':34 'immedi':84 'infer':50 'infrastructur':54 'insight':158 'key':15,31,87 'land':136,189 'larg':192 'limit':92 'list':99 'live':213 'low fee API' 'lowpaymentfee.com':33 'maximum':113 'metric':154 'model':144 'network':73 'no-api-key' 'offer':151 'page':137,186,190 'paramet':202 'pay':8,24,42 'pay-per-cal':41 'pay-per-call API' 'payload':206 'payment':63,69,78 'per':10,26,43,131 'per-request-pricing' 'platform':150 'point':184 'post':106 'premium':101 'price':143,165,183 'protocol':40 'quot':170 'rate':91,168 'receiv':81 'report':155 'request':11,27,107,132 'request/response':200 'requir':16,32 'respons':83 'return':215 'schema':201 'sentiment':159 'sentiment-analysis' 'serverless API marketplace' 'show':194 'site':134 'span':46 'specif':94 'suit':36 'summar':162 'text':161 'text-summarization' 'token':169 'unit':119 'usdc':13,29,68,121 'usdc-base-network' 'util':55 'utility-services' 'valid':174,217 'wallet':197 'x':77 'x-payment':76 'x402':2,18,39,62,109,218 'x402 API' 'x402-gated':1,17 'x402-payment-gated' 'x402-protocol':38","prices":[{"id":"ad820f19-0b30-4ad2-8d29-97c3ec078b25","listingId":"77e04c58-9e22-4853-a591-1bc266daa56b","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/collections/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T23:59:54.175Z"}],"sources":[{"listingId":"77e04c58-9e22-4853-a591-1bc266daa56b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T23:59:54.175Z","lastSeenAt":"2026-04-22T02:31:45.654Z"}],"details":{"listingId":"77e04c58-9e22-4853-a591-1bc266daa56b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/30 \\\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":"Flat $0.02 per request pricing, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/30"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/30"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"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","Running geocoding or data validation as a utility service from an autonomous workflow","Exporting analytics data or generating reports with no subscription commitment","Web3-native applications that want to pay for API calls directly on-chain"],"bestFor":["AI agents and bots that can attach x402 payment headers autonomously","Developers who want zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where $0.02/call is cost-effective"],"notFor":["High-volume production workloads where per-call costs add up quickly","Users without a Base-network USDC wallet or x402-compatible client","Anyone needing detailed SLAs, guaranteed uptime, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.104Z"},"updatedAt":"2026-04-22T02:31:45.654Z"}}