{"id":"0f02f878-e56d-431a-81b5-926960eb1235","shortId":"bbLCkY","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol, meaning no API keys, accounts, or subscriptions are needed — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/285` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's uniform $0.02/request pricing. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\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. Documentation pages exist but appear to require wallet connection to view, so detailed request/response schemas are not publicly available.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","lowpaymentfee","low payment fee","crypto-paid API","serverless API billing"],"warnings":["No public API documentation — all doc pages require wallet connection and render only 'Connect wallet'","No OpenAPI or JSON schema available for request/response formats","The specific functionality of /api/v1/payments/285 ('Premium API Access') is not described anywhere — it may be a generic or placeholder endpoint","The broader platform lists many endpoints but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/285","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/payments/285","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. However, there is no OpenAPI schema, no request/response examples, and documentation pages are gated behind wallet connection. The specific purpose of the '/api/v1/payments/285' endpoint beyond 'Premium API Access' is unclear, making this effectively a stub 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'/request':12,28,140 '0.02':11,27,130,139,191 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':118 '20':112 '2913':119 '300':150 '402':107 '6':125 'Base network API' 'USDC API' 'accept':155 'access':103 'account':79 'address':146 'advertis':164 'ai-inference' 'ai/ml':51 'analysi':168 'analyt':50 'api':5,14,21,30,39,77,102 'appear':198 'application/json':160 'attach':86 'avail':212 'base':8,24,69,114,121 'broad':44 'broader':162 'call':4,20 'caller':84 'catalog':45 'challeng':108 'classif':171 'classification' 'connect':202 'consist':133 'convers':183 'crypto-data' 'crypto-paid API' 'data':49,54,185 'data-analytics' 'decim':126 'detail':206 'document':194 'embed':172 'embeddings' 'enabl':38 'endpoint':47,59,95,154,165 'estim':180 'exchang':175 'exist':196 'feed':174 'finance-data' 'finance/web3':53 'gas':179 'generat':186 'geocod':181 'geocoding' 'header':89 'infer':52 'key':15,31,78 'list':99 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'made':144 'mean':75 'micropayment API' 'need':83 'network':70 'no-api-key' 'offer':42 'page':195 'paid':61 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'payment':88,142 'per':3,19,63,131 'per-request':62 'per-request-billing' 'platform':6,22,40,163 'point':193 'post':156 'premium':101 'price':141,173,192 'protocol':74 'public':211 'quot':178 'rate':176 'request':64,92,109,132,157 'request/response':207 'requir':16,32,200 'return':105,159 'schema':208 'second':151 'sentiment':167 'sentiment-analysis' 'serverless API billing' 'servic':57 'simpli':85 'sinc':122 'site':136 'span':48 'specif':94 'subscript':81 'summar':170 'text':169 'text-summarization' 'timeout':152 'token':177 'translat':128 'uniform':138 'unit':115 'usdc':66,117,123 'usdc-base' 'use':65,124 'util':56 'utility-services' 'valid':182 'via':9,25,71 'view':204 'wallet':201 'x402':10,26,37,73 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"0695a470-cf3d-4a5c-81b1-8c8adf026d2d","listingId":"0f02f878-e56d-431a-81b5-926960eb1235","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/payments/285","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:13.192Z"}],"sources":[{"listingId":"0f02f878-e56d-431a-81b5-926960eb1235","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/285","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:13.192Z","lastSeenAt":"2026-04-23T03:31:32.587Z"}],"details":{"listingId":"0f02f878-e56d-431a-81b5-926960eb1235","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/285 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/payments/285"},{"claim":"Payment asset is USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/285"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes and gas estimates with per-call payment","Geocoding or data validation as a utility service paid in USDC on Base","Exporting analytics data or generating reports with no subscription commitment"],"bestFor":["AI agents and bots that can attach x402 payment headers automatically","Developers who want zero-signup, pay-as-you-go API access","Web3-native applications already operating on the Base network"],"notFor":["Users who need high-volume bulk pricing or subscription discounts","Applications requiring detailed API documentation and typed schemas before integration","Callers who cannot transact in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.759Z"},"updatedAt":"2026-04-23T03:31:32.587Z"}}