{"id":"fa50df64-bb33-4308-9fea-9322988c828c","shortId":"5peJhy","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 at `/api/v1/transactions/97` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: 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 listed at the same $0.02/request price point.\n\nHowever, the specific endpoint being listed here (`/api/v1/transactions/97`) does not clearly map to any of the documented API categories. Its name \"Premium API Access\" is generic and its actual functionality is not described in the available documentation. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"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":["The specific endpoint /api/v1/transactions/97 does not correspond to any documented API category on the site — its actual functionality is unknown.","Documentation pages (/docs, /pricing, /api, /README) returned no meaningful content beyond 'Connect wallet'.","No OpenAPI spec or request/response schema is available.","The endpoint path includes a numeric ID (97) which may indicate a specific resource rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/97","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/97","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, but the actual functionality of /api/v1/transactions/97 is undocumented. No OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The endpoint name 'Premium API Access' is generic and doesn't describe what it 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'/request':13,28,153 '0.02':12,27,79,152 '000':73 '20':72 '402':67 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':63,93,179 'across':109 'actual':184 'advertis':84 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,62,86,173,178,197 'attach':96 'avail':191 'base':8,23,51,74 'broader':105 'call':4,19,81 'categori':111,174 'challeng':68 'classif':126 'clear':166 'connect':203 'content':209 'convers':143 'crypto-paid API' 'data':112,116 'describ':188 'detail':211 'doc':194 'document':172,192 'embed':127 'endpoint':55,108,146,159 'estim':137 'exchang':132 'export':117 'feed':131 'financ':128 'four':110 'function':185 'gas':136 'generat':144 'generic':181 'geocod':141 'header':100 'howev':156 'http-post' 'i.e':78 'infrastructur':139 'insight':118 'instant':92 'json-response' 'key':87 'learn':121 'limit':90 'list':59,148,161 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'map':167 'metric':114 'name':176 'network':9,24,52 'no-api-key' 'offer':107 'page':198 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99 'per':3,18,36,80 'platform':6,21,39,83,106 'point':155 'premium':61,177 'price':130,154,195 'prompt':205 'protocol':44 'quot':135 'rate':89,133 'report':115 'request':37,69,103 'request/response':212 'return':65,200 'schema':213 'sentiment':122 'simpli':95 'specif':54,158 'summar':125 'text':124 'token':134 'unavail':215 'unit':75 'usdc':15,30,47,77 'usdc-base-network' 'use':41 'util':140 'valid':142 'via':10,25 'wallet':204 'web3':129 'x402':11,26,43,98 'x402 API' 'x402-payment'","prices":[{"id":"8f615585-4e18-408e-ab6b-eac69f13ca10","listingId":"fa50df64-bb33-4308-9fea-9322988c828c","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:24.577Z"}],"sources":[{"listingId":"fa50df64-bb33-4308-9fea-9322988c828c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:24.577Z","lastSeenAt":"2026-04-23T05:01:49.180Z"}],"details":{"listingId":"fa50df64-bb33-4308-9fea-9322988c828c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/97 \\\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 requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/97"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/97"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off API calls paid in USDC on Base network","Agent-driven workflows that need frictionless per-call billing"],"bestFor":["Developers who want pay-as-you-go API access without subscriptions","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer flat-rate or subscription pricing","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.158Z"},"updatedAt":"2026-04-23T05:01:49.180Z"}}