{"id":"72914999-64a3-444b-ae54-942209bd070f","shortId":"MsYwtf","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/352` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/transactions/352` is unclear. The endpoint path suggests a transaction-related resource, but no documentation, request schema, or response schema is available beyond the generic \"Premium API Access\" label. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content. Without paying and calling the endpoint, the actual response payload and purpose remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","crypto API access"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content.","The specific purpose and response format of /api/v1/transactions/352 is unknown; 'Premium API Access' is the only description.","No OpenAPI spec, no request schema, and no response schema are provided.","Cannot verify what data or service is actually delivered after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/352","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/352","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 USDC on Base at $0.02/request. However, there is no documentation, no request/response schema, and no explanation of what '/api/v1/transactions/352' actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,80,152 '000':74 '20':73 '402':66 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,187 'actual':213 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,186,193 'attach':93 'avail':181 'base':8,23,51,75 'behind':159 'beyond':182 'broader':106 'call':4,19,82,209 'caller':91 'categori':111 'challeng':67 'classif':127 'connect':199 'content':205 'convers':144 'crypto API access' 'data':113,117 'doc':190 'document':174 'embed':128 'endpoint':55,147,164,211 'estim':138 'exchang':133 'export':118 'feed':132 'financ':129 'function':158 'gas':137 'generat':145 'generic':184 'geocod':142 'header':98 'howev':155 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'json-response' 'key':85 'label':188 'learn':122 'limit':88 'list':58 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'micropayment API' 'multipl':109 'network':9,24,52 'no-api-key' 'no-rate-limit' 'page':194 'path':165 'pay':2,17,35,207 'pay-per-cal':1,16 'pay-per-request':34 'payload':215 'payment':48,69,97,103 'per':3,18,36,81,153 'platform':6,21,39,107 'premium':60,185 'price':131,149,191 'prompt':201 'proof':104 'protocol':44 'purpos':217 'quot':136 'rate':87,134 'relat':170 'remain':218 'report':116 'request':37,154,175 'requir':68,90 'resourc':171 'respons':178,214 'return':64,196 'schema':176,179 'sentiment':123 'simpli':92 'specif':54,157 'substant':204 'suggest':166 'summar':126 'text':125 'token':135 'transact':169 'transaction-rel':168 'unclear':162 'uniform':150 'unit':76 'unknown':219 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':200 'web3':130 'without':206 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"79c865d9-6bc8-4738-bbb0-819ebf00491a","listingId":"72914999-64a3-444b-ae54-942209bd070f","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/352","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:26.469Z"}],"sources":[{"listingId":"72914999-64a3-444b-ae54-942209bd070f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/352","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:26.469Z","lastSeenAt":"2026-04-23T09:31:44.553Z"}],"details":{"listingId":"72914999-64a3-444b-ae54-942209bd070f","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with a valid payment proof.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/352\n# Returns 402 with x402 challenge. Use an x402 client library to\n# automatically handle payment and retry.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/352"},{"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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/352"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want zero-signup API access via crypto payments","AI agents that can autonomously pay for API calls using x402","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation before purchasing","Anyone without a Base-network USDC wallet or x402-compatible client","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.915Z"},"updatedAt":"2026-04-23T09:31:44.553Z"}}