{"id":"ff45ae49-977b-4913-8dcb-287b157ead28","shortId":"nEs5mr","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. No API keys, accounts, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint at `/api/v1/payments/68` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is settled 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. However, documentation beyond the landing page is extremely sparse (docs, pricing, and README pages all render only a \"Connect wallet\" prompt), so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method","ai-inference","data-analytics","finance-data","utility-services"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payments","no-auth API"],"warnings":["No API documentation available — docs, pricing, and README pages all render only 'Connect wallet'","The specific purpose of /api/v1/payments/68 ('Premium API Access') is not described anywhere; it does not match any of the named endpoints on the landing page","No request or response schemas are available for any endpoint","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/68","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/68","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 pricing and payment details. However, there is no OpenAPI schema, no request/response documentation, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The actual functionality behind 'Premium API Access' at /api/v1/payments/68 is unclear — it could be any of the advertised services or a generic payment test endpoint. Effectively a stub 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'/request':13,32 '0.02':12,31,73,136,195 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '20':130 '300':154 '402':125 '6':141 'Base network API' 'USDC micropayment API' 'accept':159 'access':121 'account':91 'across':58 'actual':221 'address':150 'advertis':96,168 'ai-inference' 'ai/ml':61 'analysi':172 'analyt':60 'api':5,17,24,36,45,89,120 'application/json':164 'attach':99 'base':8,27,81,132,144 'beyond':200 'broad':50 'broader':166 'call':4,23 'caller':97 'catalog':51 'challeng':126 'classif':175 'connect':216 'convers':187 'crypto API payments' 'data':59,64,189 'data-analytics' 'decim':142 'doc':207 'document':199 'embed':176 'enabl':44 'endpoint':57,69,113,158,169,226 'estim':184 'exchang':179 'extrem':205 'feed':178 'finance-data' 'finance/web3':63 'gas':183 'generat':190 'geocod':185 'header':104 'howev':198 'individu':225 'infer':62 'json-response' 'key':18,37,90 'land':202 'limit':94 'list':117 'lowpaymentfee' 'lowpaymentfee.com':39 'network':9,28,82 'no-api-key' 'no-auth API' 'offer':48 'page':203,211 'paid':76 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':86,103,109,146 'per':3,22,55,74 'platform':6,25,46,167 'point':197 'post':160 'post-method' 'premium':119 'price':71,177,196,208 'prompt':218 'proof':110 'protocol':87 'quot':182 'rate':93,180 'readm':210 'render':213 'request':56,75,127,161 'request/response':222 'requir':19,38 'return':123,163 'schema':223 'second':155 'sentiment':171 'servic':67 'settl':148 'simpli':98 'sinc':138 'spars':206 'specif':112 'summar':174 'text':173 'timeout':156 'token':181 'unit':133 'unknown':228 'usd':137 'usdc':15,34,78,135,139 'usdc-base-network' 'use':140 'util':66 'utility-services' 'valid':107,186 'via':10,29,83 'wallet':217 'x':102 'x-payment':101 'x402':11,30,43,85,108 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"32c6618a-f5ae-4138-aa5a-6cc30b0a8ffe","listingId":"ff45ae49-977b-4913-8dcb-287b157ead28","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:48.316Z"}],"sources":[{"listingId":"ff45ae49-977b-4913-8dcb-287b157ead28","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:48.316Z","lastSeenAt":"2026-04-22T21:31:10.466Z"}],"details":{"listingId":"ff45ae49-977b-4913-8dcb-287b157ead28","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/68 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/68"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/payments/68"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Pay-per-call AI inference (sentiment, summarization, classification, embeddings)","Fetching real-time crypto token quotes and gas estimates","Geocoding and data conversion utilities with micropayments"],"bestFor":["AI agents that need frictionless, keyless API access via x402","Developers wanting to test x402 payment flows at low cost ($0.02/call)","Applications requiring diverse utility endpoints without subscription commitments"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation and well-defined schemas before integration","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.033Z"},"updatedAt":"2026-04-22T21:31:10.466Z"}}