{"id":"8eea5568-dcbd-4b5b-8a10-e3996df11c02","shortId":"s8Uw59","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/316` 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 x402 payment header to each request.\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 uniformly priced at $0.02 per request.\n\nHowever, the specific endpoint probed (`/api/v1/transactions/316`) does not clearly map to any of the advertised API categories. Its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema, example responses, or detailed documentation, the actual behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The endpoint path /api/v1/transactions/316 does not match any of the advertised API categories on the landing page","All documentation pages (docs, pricing, README, api) rendered only a 'Connect wallet' prompt with no substantive content","Actual response payload and functionality are unknown — 'Premium API Access' is the only description provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/316","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/316","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 documentation, no OpenAPI schema, no example request/response, and the endpoint's actual functionality ('Premium API Access' on a transactions path) is unexplained. Docs pages returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,80,148 '000':74 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,174 'actual':213 'advertis':104,165 'ai':116 'analysi':120 'analyt':110 'api':5,20,38,61,84,106,166,173 'attach':93 'base':8,23,51,75 'behavior':214 'broader':102 'call':4,19,82 'caller':91 'categori':107,167 'challeng':67 'classif':123 'clear':159 'connect':196 'content':202 'convers':140 'crypto-paid API' 'data':109,113,181 'descript':169 'detail':210 'doc':187 'document':178,211 'embed':124 'endpoint':55,143,154,217 'estim':134 'exampl':207 'exchang':129 'export':114 'feed':128 'financ':125 'function':183 'gas':133 'generat':141 'geocod':138 'header':97 'howev':151 'i.e':79 'includ':108 'infrastructur':136 'insight':115 'json-response' 'key':85 'learn':118 'limit':88 'list':58 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':117 'map':160 'metric':111 'multipl':105 'network':9,24,52 'no-api-key' 'openapi':205 'page':191 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,96 'per':3,18,36,81,149 'platform':6,21,39,103 'post-method' 'premium':60,172 'price':127,146,188 'probe':155 'prompt':198 'protocol':44 'quot':132 'rate':87,130 'readm':190 'remain':218 'render':193 'report':112 'request':37,100,150 'requir':68,90 'respons':208 'return':64,185 'schema':206 'sentiment':119 'simpli':92,171 'specif':54,153 'substant':201 'summar':122 'text':121 'token':131 'unclear':219 'uniform':145 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':137 'valid':139 'via':10,25 'wallet':197 'web3':126 'without':203 'x402':11,26,43,95 'x402 API' 'x402-payment'","prices":[{"id":"735b2102-7759-411d-a950-593897a266bb","listingId":"8eea5568-dcbd-4b5b-8a10-e3996df11c02","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/316","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:57.406Z"}],"sources":[{"listingId":"8eea5568-dcbd-4b5b-8a10-e3996df11c02","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/316","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:57.406Z","lastSeenAt":"2026-04-23T13:01:59.154Z"}],"details":{"listingId":"8eea5568-dcbd-4b5b-8a10-e3996df11c02","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/316 \\\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":"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/316"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/316"}],"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 transaction or financial data without subscription commitments"],"bestFor":["Developers who want to pay per request without API key management","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayment access over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.314Z"},"updatedAt":"2026-04-23T13:01:59.154Z"}}