{"id":"c69b8e40-1dd0-4e67-be69-1805a7c330a5","shortId":"He6eDb","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 broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/121` is listed as \"Premium API Access\" with a max amount of 20,000 base units of USDC (0.02 USDC = $0.02) on Base. The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain unverified. The specific functionality behind the `/api/v1/transfers/121` path is not documented beyond its title.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-method","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all return only a 'Connect wallet' prompt with no content.","The specific functionality of /api/v1/transfers/121 ('Premium API Access') is undocumented; the request body schema and response format are unknown.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have verifiable documentation or response schemas.","No OpenAPI spec or output schema provided beyond minimal input metadata."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/121","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/transfers/121","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 pricing is clear ($0.02 USDC per call on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and all documentation pages are empty stubs. The specific purpose of the /api/v1/transfers/121 endpoint is unclear beyond its generic 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'/request':13,28 '0.02':12,27,64,114,116 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':144 '20':108 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':131 'access':102 'account':76 'actual':195 'address':139 'advertis':150 'ai/ml':49 'amount':106 'analysi':159 'analyt':48 'api':5,20,37,74,101 'attach':84 'base':8,23,71,110,118,146 'behavior':196 'behind':208 'beyond':215 'broad':42 'broader':148 'call':4,19 'caller':82 'captur':124 'categori':151 'challeng':121 'classif':162 'confirm':125 'connect':186 'content':192 'contract':143 'convers':174 'crypto-paid API' 'data':47,52,155 'direct':137 'doc':180 'document':178,214 'embed':163 'enabl':36 'endpoint':45,57,94,127,202 'estim':171 'exchang':166 'export':156 'feed':165 'finance/web3':51 'function':207 'gas':170 'generat':176 'geocod':172 'header':88 'howev':177 'includ':152 'infer':50 'insight':157 'key':75 'limit':79 'list':98 'live':129 'lowpaymentfee' 'lowpaymentfee.com':31 'max':105 'metric':153 'network':9,24,72 'no-api-key' 'no-rate-limit' 'offer':40 'page':179 'path':211 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87,135 'per':3,18,61 'platform':6,21,38,149 'post':132 'post-method' 'premium':100 'price':164,181 'prompt':188 'quot':169 'rate':78,167 'readm':182 'remain':203 'report':154 'request':62,91,133 'requir':81 'respons':198 'return':183 'schema':199 'sentiment':158 'servic':55 'set':43 'settl':66 'simpli':83 'span':46 'specif':93,206 'substant':191 'success':123 'summar':161 'text':160 'titl':217 'token':168 'unit':111 'unverifi':204 'usdc':15,30,68,113,115,142 'usdc-base' 'use':141 'util':54 'valid':173 'via':10,25 'wallet':187 'x402':11,26,35,86,120 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2978e998-bf0a-4735-9d5a-ac59becdc995","listingId":"c69b8e40-1dd0-4e67-be69-1805a7c330a5","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/transfers/121","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:25.180Z"}],"sources":[{"listingId":"c69b8e40-1dd0-4e67-be69-1805a7c330a5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/121","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:25.180Z","lastSeenAt":"2026-04-23T03:32:01.406Z"}],"details":{"listingId":"c69b8e40-1dd0-4e67-be69-1805a7c330a5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/121 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 (0.02 USD) on Base for /api/v1/transfers/121","source_url":"https://lowpaymentfee.com/api/v1/transfers/121"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/121"},{"claim":"Platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without creating an account or managing API keys","Making one-off paid API calls settled instantly in USDC on Base","Agent-driven workflows that need frictionless per-request billing"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can autonomously pay for API calls via x402","Users already holding USDC on Base who want low-friction micropayments"],"notFor":["Users who need detailed API documentation or response schema guarantees before calling","High-volume consumers who need subscription-based pricing or bulk discounts","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.161Z"},"updatedAt":"2026-04-23T03:32:01.406Z"}}