{"id":"0690e3ea-42d6-40be-a89d-5b34e43cdb7d","shortId":"Js4egZ","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint at `/api/v1/charges/265` 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 made via the x402 exact scheme to the payTo address, with a 300-second timeout.\n\nThe broader platform advertises endpoints in four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the crawled documentation pages (docs, api, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas, supported parameters, and output formats for these endpoints remain unknown.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-api-key endpoint","crypto paid api"],"warnings":["The endpoint description 'Premium API Access' is generic and does not describe what the endpoint actually does or returns.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no usable technical content.","No OpenAPI spec, request schema, or response schema is available — integration requires trial and error.","The specific functionality of /api/v1/charges/265 versus the other listed endpoints is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/265","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/265","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, but the endpoint's actual functionality behind \"Premium API Access\" is undefined. Documentation pages all returned only a wallet-connect prompt with no technical content, schemas, or examples. The listing is effectively a stub with pricing 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'/request':13,28 '0.02':12,27,73,122,189 '000':111 '0x8335':116 '20':110 '2913':117 '300':142 '6':126 'accept':97 'access':95 'across':45 'actual':214 'address':139 'advertis':148 'ai':160 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':48 'analysi':164 'analyt':47,154 'api':5,20,37,78,94,198 'base':8,23,66,112,119 'base network api' 'broader':146 'call':4,19,75 'categori':152 'challeng':102 'classif':167 'confirm':103 'connect':204 'convers':183 'conversion' 'crawl':194 'crypto paid api' 'crypto-gas-estimates' 'data':46,51,153,157 'data-analytics' 'decim':127 'detail':211 'doc':197 'document':195 'embed':168 'enabl':36 'endpoint':44,56,87,149,224 'equal':121 'estim':178 'exact':134 'exchang':173 'exchange-rates' 'export':158 'feed':172 'financ':169 'finance-price-feeds' 'finance/web3':50 'flat':70 'format':221 'four':151 'gas':177 'generat':184 'geocod':181 'geocoding' 'given':123 'howev':192 'infer':49 'infrastructur':180 'insight':159 'key':79 'learn':162 'limit':81 'list':91 'live':106 'low payment fee' 'lowpaymentfee.com':31 'machin':161 'made':130 'metric':155 'micropayment api' 'network':9,24,67 'no-api-key endpoint' 'offer':40 'output':220 'page':196 'paid':58 'paramet':218 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'payment':128 'payto':138 'per':3,18,60,74,190 'per-request':59 'per-request-pricing' 'platform':6,21,38,147 'post':98 'premium':93 'price':171,187,199 'prompt':206 'quot':176 'rate':71,80,174 'readm':200 'remain':225 'report':156 'request':61,99,107,191 'request/response':215 'requir':84 'return':201 'schema':216 'scheme':135 'second':143 'sentiment':163 'servic':54 'specif':86 'subscript':83 'summar':166 'support':217 'technic':210 'text':165 'timeout':144 'token':175 'unit':113 'unknown':226 'usdc':15,30,63,115,124 'usdc api' 'usdc-base' 'use':62 'util':53 'valid':182 'validation' 'varieti':42 'via':10,25,131 'wallet':205 'web3':170 'x402':11,26,35,101,133 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2519b7f6-c56f-40f6-9b9d-4e2bca1399b5","listingId":"0690e3ea-42d6-40be-a89d-5b34e43cdb7d","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/265","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:39.940Z"}],"sources":[{"listingId":"0690e3ea-42d6-40be-a89d-5b34e43cdb7d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/265","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:39.940Z","lastSeenAt":"2026-04-22T16:31:14.315Z"}],"details":{"listingId":"0690e3ea-42d6-40be-a89d-5b34e43cdb7d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/265 \\\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 pricing of $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoints span Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/charges/265"},{"claim":"Payment timeout is 300 seconds, scheme is exact, network is Base","source_url":"https://lowpaymentfee.com/api/v1/charges/265"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a pay-per-call basis without API keys","Fetching real-time crypto token quotes, gas estimates, and exchange rates","Running data analytics queries and exporting reports with per-request billing","Geocoding, validation, and conversion utilities paid in USDC on Base"],"bestFor":["Developers who want instant API access without signup or API key management","Agents and bots that can settle micropayments in USDC on Base via x402","Projects needing low-cost, low-friction access to diverse utility and AI endpoints"],"notFor":["Users who need detailed API documentation and well-defined schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Teams requiring non-crypto payment methods or fiat invoicing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.717Z"},"updatedAt":"2026-04-22T16:31:14.315Z"}}