{"id":"5b28daa8-4a53-4a58-915d-70bddcf58d80","shortId":"S4dSLa","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/charges/180` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum charge of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling directly on-chain to the provider's wallet.\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 per request price point. However, documentation beyond the landing page is essentially empty (all sub-pages only show \"Connect wallet\"), so the actual request/response schemas for individual endpoints are unknown. The specific functionality behind the `/api/v1/charges/180` path is not documented and may be a generic or demo endpoint rather than a distinct service.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","cheap api access","no-auth api","crypto pay api"],"warnings":["No documentation available — all sub-pages (docs, api, pricing, README) return only 'Connect wallet' with no content","The specific endpoint /api/v1/charges/180 has no documented request or response schema; its actual functionality is unknown","The platform lists many endpoint categories but none have verifiable documentation or examples","No OpenAPI specification or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/180","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/180","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, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation for request/response schemas, no OpenAPI spec, and all doc/pricing/API pages are empty stubs showing only 'Connect wallet'. The specific purpose of /api/v1/charges/180 is unclear beyond the generic 'Premium API Access' 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'/request':19,38 '0.02':18,37,122,176 '000':112 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20':111 '6':126 'accept':100 'access':98 'actual':200 'advertis':149 'ai':12,31 'ai-inference' 'ai/ml':56 'analysi':153 'analyt':55 'api':5,24,45,79,97 'base':8,27,75,113,119 'base usdc api' 'behind':211 'beyond':183 'broader':147 'call':4,23 'chain':140 'challeng':105 'charg':109 'cheap api access' 'classif':156 'classification' 'collect':50 'commit':86 'connect':196 'convers':168 'crypto pay api' 'crypto-quotes' 'data':11,30,54,59,170 'data-analytics' 'decim':127 'demo':224 'direct':137 'distinct':229 'document':182,217 'embed':157 'embeddings' 'empti':189 'enabl':44 'endpoint':16,35,52,65,90,150,205,225 'equal':121 'essenti':188 'estim':165 'exact':134 'exchang':160 'feed':159 'financ':13,32 'finance-data' 'finance/web3':58 'function':210 'gas':164 'general':61 'generat':171 'generic':222 'geocod':166 'geocoding' 'given':123 'howev':181 'indic':106 'individu':204 'infer':57 'key':80 'land':185 'limit':83 'list':94 'low payment fee' 'lowpaymentfee.com':39 'made':130 'maximum':108 'may':219 'micropayment api' 'network':76 'no-auth api' 'offer':48 'on-chain':138 'page':186,193 'path':214 'pay':2,21,68 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':67 'payment':128 'per':3,22,69,177 'platform':6,25,46,148 'point':180 'post':101 'premium':96 'price':158,179 'provid':143 'quot':163 'rate':82,161 'rather':226 'request':70,102,178 'request/response':201 'requir':87 'schema':202 'scheme':135 'sentiment':152 'sentiment-analysis' 'servic':63,230 'settl':136 'show':195 'span':53 'specif':89,209 'sub':192 'sub-pag':191 'summar':155 'text':154 'text-summarization' 'token':162 'unit':114 'unknown':207 'usdc':72,116,124 'usdc-base' 'use':71 'util':15,34,62 'utility-services' 'valid':167 'via':9,28,131 'wallet':145,197 'x402':10,29,43,104,133 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2eb59cb9-7be5-428c-a021-8f48f3219909","listingId":"5b28daa8-4a53-4a58-915d-70bddcf58d80","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/180","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:20.078Z"}],"sources":[{"listingId":"5b28daa8-4a53-4a58-915d-70bddcf58d80","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/180","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:20.078Z","lastSeenAt":"2026-04-23T11:03:19.908Z"}],"details":{"listingId":"5b28daa8-4a53-4a58-915d-70bddcf58d80","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/180 \\\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":"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 (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/180"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages are empty, showing only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant pay-per-use billing","Integrating pay-per-request data analytics and reporting into agent workflows"],"bestFor":["Agents needing low-friction, keyless API access paid in USDC on Base","Developers who want per-call billing with no subscription or rate limits","Web3-native applications that can settle micropayments on-chain"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation and guaranteed SLAs","Applications requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.684Z"},"updatedAt":"2026-04-23T11:03:19.908Z"}}