{"id":"3339da4c-b965-44c5-84ec-b2368eefea6a","shortId":"fmBtBG","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/265` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of 20,000 base units of USDC (0.02 USD) 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 priced at $0.02 per request.\n\nHowever, the specific endpoint being listed here (`/api/v1/transactions/265`) is labeled only as \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. Without documentation or example responses, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","finance"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","402 payment api"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","The specific endpoint /api/v1/transactions/265 has no description beyond 'Premium API Access'; its actual functionality is unknown","No OpenAPI schema, no example requests or responses, no input/output documentation","This endpoint does not appear in the site's own listed API catalog, raising questions about what it actually does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/265","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/265","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation about what this specific endpoint does, what it accepts as input, or what it returns. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. The listing is effectively a 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'/request':13,28 '0.02':12,27,77,149 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,92,166 'across':108 'actual':202 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,165,181 'attach':95 'base':8,23,51,73 'base network api' 'behavior':203 'broader':104 'call':4,19,80 'categori':110 'challeng':67 'classif':125 'connect':189 'content':195 'convers':142 'data':111,115,173 'doc':179 'document':170,197 'embed':126 'endpoint':55,107,145,155,206 'estim':136 'exampl':199 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':175 'gas':135 'generat':143 'geocod':140 'header':99 'howev':152 'http-post' 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'label':161 'learn':120 'limit':89 'list':58,157 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':106 'page':184 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,69,98 'per':3,18,36,79,150 'platform':6,21,39,82,105 'premium':60,164 'price':129,147,180 'prompt':191 'protocol':44 'quot':134 'rate':88,132 'readm':183 'render':186 'report':114 'request':37,102,151 'requir':68 'respons':200 'return':64,177 'sentiment':121 'simpli':94 'specif':54,154 'substant':194 'summar':124 'text':123 'token':133 'unit':74 'unknown':208 'usd':78 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':190 'web3':128 'without':196 'x402':11,26,43,97 'x402 api' 'x402-payment'","prices":[{"id":"fca3b01a-8148-451d-9b7f-6a42578df6c7","listingId":"3339da4c-b965-44c5-84ec-b2368eefea6a","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/265","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:44.154Z"}],"sources":[{"listingId":"3339da4c-b965-44c5-84ec-b2368eefea6a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/265","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:44.154Z","lastSeenAt":"2026-04-23T16:07:44.939Z"}],"details":{"listingId":"3339da4c-b965-44c5-84ec-b2368eefea6a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/265 \\\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 requiring 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/265"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API data with per-request USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless API access settled in USDC on Base","Low-volume, pay-per-use API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where per-request pricing may add up","Anyone who needs to understand the response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.432Z"},"updatedAt":"2026-04-23T16:07:44.939Z"}}