{"id":"ee99c85c-1444-4e00-92a4-6911bb384531","shortId":"UPNxYc","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 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/transactions/297` is listed as \"Premium API Access\" and returns a 402 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 scheme is \"exact\" 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 per call. 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 example payloads available for any endpoint, including this one.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payment","402 payment required"],"warnings":["No OpenAPI or schema documentation available for any endpoint","Docs, API, pricing, and README pages all render only 'Connect wallet' with no content","The specific purpose of /api/v1/transactions/297 ('Premium API Access') is undefined — no input/output schema provided","Cannot verify what data or functionality this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/297","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/297","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific endpoint ('/api/v1/transactions/297') is unclear — 'Premium API Access' is generic and undescriptive. Effectively a stub 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'/request':13,28 '0.02':12,27,62,121,175 '000':110 '0x8335':115 '20':109 '2913':116 '300':134 '402':104 '402 payment required' '6':125 'Base network API' 'USDC micropayment API' 'accept':139 'access':100 'account':74 'across':45 'advertis':148 'ai/ml':48 'analysi':152 'analyt':47 'api':5,20,37,72,99,185 'application/json':144 'attach':82 'avail':215 'base':8,23,69,111,118 'base-network' 'broader':146 'call':4,19,177 'caller':80 'challeng':105 'classif':155 'connect':194 'convers':167 'crypto API payment' 'data':46,169 'decim':126 'detail':201 'doc':184 'document':179,210 'embed':156 'enabl':36 'endpoint':44,55,92,138,149,218 'equal':120 'estim':164 'exact':131 'exampl':213 'exchang':159 'extrem':181 'feed':158 'finance/web3':50 'gas':163 'generat':170 'geocod':165 'given':122 'header':86 'howev':178 'includ':219 'infer':49 'infrastructur':52 'json-response' 'key':73 'limit':77 'list':96 'lowpaymentfee' 'lowpaymentfee.com':31 'network':9,24,70 'no-api-key' 'offer':40 'one':221 'openapi':205 'page':189 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payload':214 'payment':85,128 'per':3,18,59,176 'platform':6,21,38,147 'post':140 'post-method' 'premium':98 'price':157,186 'prompt':196 'quot':162 'rate':76,160 'readm':188 'render':191 'request':60,89,106,141 'request/response':208 'requir':79 'return':102,143 'schema':209 'scheme':129 'second':135 'sentiment':151 'settl':64 'simpli':81 'spars':182 'spec':206 'specif':91 'summar':154 'technic':200 'text':153 'timeout':136 'token':161 'unit':112 'usdc':15,30,66,114,123 'usdc-settlement' 'util':53 'valid':166 'varieti':42 'via':10,25 'wallet':195 'x402':11,26,35,84 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"8e964891-7ae1-4663-947f-127473bdd52f","listingId":"ee99c85c-1444-4e00-92a4-6911bb384531","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/297","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:55.271Z"}],"sources":[{"listingId":"ee99c85c-1444-4e00-92a4-6911bb384531","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/297","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:55.271Z","lastSeenAt":"2026-04-22T13:31:49.175Z"}],"details":{"listingId":"ee99c85c-1444-4e00-92a4-6911bb384531","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/297 \\\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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/297"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need frictionless pay-per-use endpoints"],"bestFor":["Developers who want zero-signup API access via crypto micropayments","AI agents that can autonomously pay for API calls using x402","Users already holding USDC on Base who want low-friction API consumption"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","Teams requiring fiat-only payment methods with no crypto wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.9Z"},"updatedAt":"2026-04-22T13:31:49.175Z"}}