{"id":"18e7fa58-4a68-4b49-8d7a-7ba37fc18f43","shortId":"WX9WDb","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/332` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no actual technical documentation, so the exact request/response schemas for this and other endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No API documentation available — docs, pricing, and README pages all return only 'Connect wallet'","No request or response schema provided for /api/v1/charges/332 or any other endpoint","The endpoint path '/api/v1/charges/332' with description 'Premium API Access' does not clearly map to any of the advertised API categories on the homepage","Actual functionality behind this endpoint is unknown — it may be a generic charge endpoint rather than a specific service"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/332","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/charges/332","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but all documentation pages returned only 'Connect wallet' with no technical content. There is no OpenAPI spec, no request/response schema, and no description of what this specific endpoint actually returns. The listing is effectively a stub with pricing 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'/request':13,30 '0.02':12,29,62,135,182 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':129 '20':123 '2913':130 '300':149 '6':139 'Base network API' 'USDC API' 'accept':110 'access':108 'across':50 'actual':199 'address':145 'advertis':155 'ai-inference' 'ai/ml':53 'analysi':159 'analyt':52 'api':5,15,22,32,41,79,107 'attach':91 'base':8,25,70,125,132 'broad':46 'broader':153 'call':4,21 'caller':89 'challeng':115 'classif':162 'classification' 'confirm':116 'connect':194 'convers':174 'cost':61 'data':51,176 'data-analytics' 'decim':140 'doc':188 'document':186,201 'embed':163 'embeddings' 'enabl':40 'endpoint':49,60,100,156,211 'equal':134 'estim':171 'everi':59 'exact':204 'exchang':166 'feed':165 'finance-data' 'finance/web3':55 'gas':170 'generat':177 'geocod':172 'geocoding' 'given':136 'header':94 'howev':185 'infer':54 'infrastructur':57 'key':16,33,80 'limit':88 'list':104 'live':119 'lowpaymentfee' 'lowpaymentfee.com':35 'mean':75 'micropayment API' 'network':71 'no-api-key' 'offer':44 'page':187 'paid':65 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':93,141 'per':3,20,63 'platform':6,23,42,154 'point':184 'post':111 'premium':106 'premium API access' 'price':164,183,189 'prompt':196 'protocol':74 'quot':169 'rate':87,167 'readm':190 'request':64,97,112,120 'request/response':205 'requir':17,34 'return':191 'schema':206 'second':150 'sent':143 'sentiment':158 'sentiment-analysis' 'set':47 'sign':83 'sign-up':82 'simpli':90 'specif':99 'summar':161 'technic':200 'text':160 'text-summarization' 'timeout':151 'token':168 'unit':126 'unknown':213 'up':84 'usdc':9,26,67,128,137 'usdc-base-network' 'util':58 'utility-services' 'valid':173 'via':10,27 'wallet':195 'x402':11,28,39,73,114 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"0920200d-0965-4d15-84c0-b3363c087720","listingId":"18e7fa58-4a68-4b49-8d7a-7ba37fc18f43","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/charges/332","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:15.739Z"}],"sources":[{"listingId":"18e7fa58-4a68-4b49-8d7a-7ba37fc18f43","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/332","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:15.739Z","lastSeenAt":"2026-04-23T08:01:18.590Z"}],"details":{"listingId":"18e7fa58-4a68-4b49-8d7a-7ba37fc18f43","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/332 \\\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":"All endpoints cost $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/charges/332 requires up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/332"},{"claim":"Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes, gas estimates, and exchange rates via micropayment","Geocoding and data validation as lightweight utility calls in automated pipelines","Exporting analytics data or generating insights reports on a per-request billing model"],"bestFor":["AI agents that need keyless, pay-as-you-go access to diverse API endpoints","Developers prototyping with multiple API categories without subscription commitments","Web3-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly compared to subscription APIs","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.121Z"},"updatedAt":"2026-04-23T08:01:18.590Z"}}