{"id":"d92660f6-d6aa-4c8b-8a75-206fcb8dfe5c","shortId":"fJV4Zn","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 priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach an X-PAYMENT header with a signed USDC payment, and the endpoint processes the request upon verification.\n\nThe specific endpoint at `/api/v1/transactions/76` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\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 — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (pages like /docs, /pricing, and /README only show a \"Connect wallet\" prompt), so the actual functionality behind each endpoint is unverified. The specific behavior of the `/api/v1/transactions/76` endpoint is not documented beyond its title.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"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 documentation available — /docs, /pricing, and /README pages are empty (only show 'Connect wallet')","No OpenAPI or schema describing request parameters or response format for this endpoint","The specific purpose of /api/v1/transactions/76 ('Premium API Access') is not explained anywhere","Functionality of advertised endpoints (AI, analytics, finance, etc.) is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/76","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/transactions/76","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 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint (/api/v1/transactions/76) is completely undocumented. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/docs':211 '/pricing':212 '/readme':214 '/request':13,28 '0.02':12,27,59,137,197 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':131 '20':125 '2913':132 '300':152 '402 payment API' '6':141 'Base network API' 'USDC micropayment API' 'accept':157 'access':116 'across':45 'actual':223 'address':148 'advertis':166 'ai/ml':48 'analysi':175 'analyt':47 'api':5,20,37,71,115 'application/json':162 'attach':87 'base':8,23,67,127,134 'behavior':232 'behind':225 'beyond':202,240 'broader':164 'call':4,19 'caller':86 'categori':167 'challeng':121 'classif':178 'commit':78 'connect':218 'convers':190 'crypto-paid API' 'data':46,171 'decim':142 'document':201,239 'embed':179 'empti':208 'enabl':36 'endpoint':44,55,100,108,156,227,236 'equal':136 'essenti':207 'estim':187 'exchang':182 'export':172 'feed':181 'finance/web3':50 'function':224 'gas':186 'generat':192 'geocod':188 'given':138 'handl':83 'header':92 'howev':200 'includ':168 'infer':49 'infrastructur':52 'inlin':85 'insight':173 'json-response' 'key':72 'land':204 'like':210 'limit':75 'list':112 'lowpaymentfee' 'lowpaymentfee.com':31 'metric':169 'network':9,24,68 'no-api-key' 'offer':40 'page':205,209 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':62 'payment':84,91,97,144 'per':3,18,60 'platform':6,21,38,165 'point':199 'post':158 'post-method' 'premium':114 'price':57,180,198 'process':101 'prompt':220 'protocol':82 'quot':185 'rate':74,183 'report':170 'request':61,103,122,159 'requir':79 'return':118,161 'second':153 'sent':146 'sentiment':174 'show':216 'sign':95 'specif':107,231 'summar':177 'text':176 'timeout':154 'titl':242 'token':184 'unit':128 'unverifi':229 'upon':104 'usdc':15,30,64,96,130,139 'usdc-base' 'util':53 'valid':189 'varieti':42 'verif':105 'via':10,25 'wallet':219 'x':90 'x-payment':89 'x402':11,26,35,81,120 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"5d5a6f93-4a18-40eb-8d30-6bd799d09596","listingId":"d92660f6-d6aa-4c8b-8a75-206fcb8dfe5c","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/transactions/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:09.434Z"}],"sources":[{"listingId":"d92660f6-d6aa-4c8b-8a75-206fcb8dfe5c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:09.434Z","lastSeenAt":"2026-04-23T06:31:40.362Z"}],"details":{"listingId":"d92660f6-d6aa-4c8b-8a75-206fcb8dfe5c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/76 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/76"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/76"},{"claim":"Platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to analytics, AI, finance, or utility endpoints without subscriptions"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over API key management"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.89Z"},"updatedAt":"2026-04-23T06:31:40.362Z"}}