{"id":"05f4e65e-af40-4683-a688-e95520ec6642","shortId":"uuza5h","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","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 general-purpose utilities. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no subscriptions, no rate limits.\n\nThe specific endpoint at `/api/v1/messages/34` 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 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout. The broader platform also exposes 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.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and the /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt. Without schemas or example payloads, callers will need to experiment to discover the expected input and output formats for each endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","data-export","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","ai inference api","crypto price api"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The specific endpoint /api/v1/messages/34 has no description beyond 'Premium API Access'; its actual functionality is unclear","The /pricing, /api, and /README pages contain no useful content (only 'Connect wallet')","No rate-limit or SLA information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/34","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/messages/34","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, and the landing page confirms pricing and lists many endpoints. However, there is no OpenAPI spec, no request/response schemas, no example payloads, and the /api, /pricing, and /README pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/messages/34 is unclear beyond the generic label \"Premium API 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'/api/v1/messages/34':95 '/pricing':202 '/readme':204 '/request':18,36 '0.02':17,35,69,126,175 '000':115 '0x8335':120 '20':114 '2913':121 '300':141 '6':130 'accept':103 'access':101 'advertis':109 'ai':11,29 'ai inference api' 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'also':147 'analysi':152 'analyt':12,30,54 'api':5,23,43,84,100 'avail':185 'bare':210 'base':8,26,77,116,123 'base network api' 'broad':48 'broader':145 'call':4,22 'caller':219 'catalog':49 'challeng':108 'classif':155 'connect':211 'convers':167 'conversion' 'cost':112 'cover':10,28 'crypto price api' 'crypto-gas-estimates' 'data':53,58,169 'data-analytics' 'data-export' 'decim':131 'discov':225 'document':178,198 'embed':156 'enabl':42 'endpoint':51,65,93,149,186,234 'equal':125 'estim':164 'everi':64 'exact':137 'exampl':217 'exchang':159 'exchange-rates' 'expect':227 'experi':223 'expos':148 'feed':158 'financ':13,31 'finance-price-feeds' 'finance/web3':57 'format':231 'gas':163 'general':61 'general-purpos':60 'generat':170 'geocod':165 'geocoding' 'given':127 'infer':56 'input':228 'key':85 'land':182 'limit':90 'list':97,184 'low payment fee' 'lowpaymentfee.com':37 'made':134 'maximum':111 'micropayment api' 'minim':180 'need':221 'network':78 'offer':46 'openapi':193 'output':230 'page':183,205 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payabl':72 'payload':218 'payment':132 'per':3,21,70 'platform':44,146 'point':177 'post':104 'premium':99 'price':67,157,176,188 'prompt':213 'protocol':82 'purpos':62 'quot':162 'rate':89,160 'request':71,105 'request/response':196 'resolv':207 'schema':197,215 'scheme':138 'second':142 'sentiment':151 'span':52 'spec':194 'specif':92 'subscript':87 'suit':6,24 'summar':154 'text':153 'timeout':143 'token':161 'unit':117 'usdc':9,27,74,119,128 'usdc api' 'usdc-base' 'util':15,33,63 'valid':166 'validation' 'via':79,135 'wallet':212 'without':214 'x402':41,81,107 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"f6babd19-3ff0-452f-8aed-a57730edd786","listingId":"05f4e65e-af40-4683-a688-e95520ec6642","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/messages/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.661Z"}],"sources":[{"listingId":"05f4e65e-af40-4683-a688-e95520ec6642","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.661Z","lastSeenAt":"2026-04-22T02:32:07.474Z"}],"details":{"listingId":"05f4e65e-af40-4683-a688-e95520ec6642","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/34 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"message\": \"Hello\"}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/34"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Running one-off AI inference tasks (sentiment, summarization, classification) without managing API keys or subscriptions","Fetching real-time crypto token quotes and gas estimates for DeFi applications","Geocoding addresses or validating data in lightweight automation pipelines","Exporting analytics data or generating insights on demand","Paying for API calls directly with USDC on Base from an agent wallet"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Prototyping and low-volume use cases where $0.02/call is acceptable","Web3-native applications that prefer on-chain settlement"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who need fiat billing or traditional API-key authentication","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.647Z"},"updatedAt":"2026-04-22T02:32:07.474Z"}}