{"id":"aad4784b-4c42-4bc6-81c3-3738e44dd2a6","shortId":"DZvB5L","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, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/charges/149` is labeled \"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 to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 generation — all at the same $0.02 per request price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The exact functionality behind the \"Premium API Access\" label at `/api/v1/charges/149` is unclear — it may be a generic charge endpoint or a gateway to one of the listed services.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","no-api-key","post-endpoint","pay-per-use"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","serverless API billing"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content","The specific functionality of /api/v1/charges/149 ('Premium API Access') is not documented anywhere","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/149","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/149","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of the /api/v1/charges/149 endpoint is undefined. Effectively a stub 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'/request':13,28 '0.02':12,27,112,164 '000':102 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':129 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':107 '20':101 '300':132 '6':116 'Base network API' 'USDC micropayment API' 'accept':90 'access':88,218 'across':45 'address':128 'advertis':138 'ai/ml':48 'analysi':142 'analyt':47 'api':5,20,37,69,87,176,217 'avail':206 'base':8,23,65,103,109 'behind':214 'broader':136 'call':4,19 'challeng':95 'charg':99,229 'classif':145 'commit':77 'connect':185 'content':210 'convers':157 'crawl':209 'crypto-paid API' 'data':46 'decim':117 'detail':192 'doc':175 'document':170,201 'embed':146 'enabl':36 'endpoint':44,55,81,139,230 'equal':111 'estim':154 'exact':124,212 'exampl':205 'exchang':149 'extrem':172 'feed':148 'finance/web3':50 'function':213 'gas':153 'gateway':233 'generat':159 'generic':228 'geocod':155 'given':113 'howev':169 'indic':96 'infer':49 'infrastructur':52 'key':70 'label':85,219 'limit':73 'list':238 'lowpaymentfee' 'lowpaymentfee.com':31 'made':120 'maximum':98 'may':225 'minimum':76 'network':9,24,66 'no-api-key' 'offer':40 'one':235 'openapi':196 'page':180 'paid':57 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-use' 'payment':118 'per':3,18,59,165 'per-request':58 'per-request-billing' 'platform':6,21,38,137 'point':168 'post':91 'post-endpoint' 'premium':86,216 'price':147,167,177 'prompt':187 'quot':152 'rate':72,150 'readm':179 'render':182 'request':60,92,166 'request/response':199 'requir':78 'schema':200 'scheme':125 'second':133 'sentiment':141 'serverless API billing' 'servic':239 'settl':126 'spars':173 'spec':197 'specif':80 'summar':144 'technic':191 'text':143 'timeout':134 'token':151 'unclear':223 'unit':104 'usag':204 'usdc':15,30,62,106,114 'usdc-base-network' 'use':61 'util':53 'valid':156 'varieti':42 'via':10,25,121 'wallet':186 'x402':11,26,35,94,123 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a0297f57-b509-48ba-a3aa-3ddf2880e58c","listingId":"aad4784b-4c42-4bc6-81c3-3738e44dd2a6","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/149","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:16.423Z"}],"sources":[{"listingId":"aad4784b-4c42-4bc6-81c3-3738e44dd2a6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/149","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:16.423Z","lastSeenAt":"2026-04-24T05:02:31.025Z"}],"details":{"listingId":"aad4784b-4c42-4bc6-81c3-3738e44dd2a6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/149 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/149"},{"claim":"All endpoints are 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":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/149"}],"useCases":["Accessing data analytics and reporting endpoints without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto and finance data (prices, exchange rates, gas estimates)","Using utility services like geocoding, validation, and data conversion"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents that can settle payments via x402 on Base","Projects needing low-cost per-request API calls without API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where subscription pricing would be more economical","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.865Z"},"updatedAt":"2026-04-24T05:02:31.025Z"}}