{"id":"c02673ec-5079-400f-bcd8-cd9cc79fbcb1","shortId":"JDFWjR","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/products/53` is listed as \"Premium API Access\" and returns an x402 challenge requiring a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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\nThis particular endpoint (`/api/v1/products/53`) is labeled \"Premium API Access\" but its actual functionality is unclear — the description is generic and no schema or documentation describes what data it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional content. Callers should be aware that the endpoint's concrete behavior is undocumented beyond its name.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 API","USDC API","Base network API","pay-per-call API","micropayment API","premium API access"],"warnings":["The actual functionality of /api/v1/products/53 ('Premium API Access') is undocumented — it is unclear what data or service it provides.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI schema, no request/response examples, and no input parameters are documented anywhere.","The endpoint name 'Premium API Access' is generic and does not describe a specific capability."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/53","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/products/53","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 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no example request/response, and the actual functionality of /api/v1/products/53 is completely undocumented. The docs pages render only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,79,154 '000':73 '20':72 'Base network API' 'USDC API' 'accept':46 'access':62,93,165 'across':113 'actual':168 'addit':204 'advertis':84 'ai':123 'analysi':127 'analyt':117 'api':5,20,38,61,86,164,190 'attach':96 'awar':209 'base':8,23,51,74 'behavior':215 'beyond':218 'broader':109 'call':4,19,81 'caller':94,206 'categori':115 'challeng':67 'classif':130 'concret':214 'connect':199 'content':205 'convers':147 'data':116,120,183 'describ':181 'descript':173 'doc':187 'document':180 'embed':131 'endpoint':55,112,150,159,212 'estim':141 'exchang':136 'export':121 'feed':135 'financ':132 'four':114 'function':169 'gas':140 'generat':148 'generic':175 'geocod':145 'header':101 'http-post' 'i.e':78 'infrastructur':143 'insight':122 'instant':92 'json-response' 'key':87 'label':162 'learn':125 'limit':90 'list':58 'low payment fee' 'lowpaymentfee.com':31 'machin':124 'maximum':70 'metric':118 'micropayment API' 'name':220 'network':9,24,52 'no-api-key' 'offer':111 'page':191 'particular':158 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,100,106 'per':3,18,36,80,155 'platform':6,21,39,83,110 'premium':60,163 'premium API access' 'price':134,152,188 'prompt':201 'proof':107 'protocol':44 'quot':139 'rate':89,137 'render':196 'report':119 'request':37,156 'requir':68 'return':64,185 'schema':178 'sentiment':126 'simpli':95 'site':194 'specif':54 'summar':129 'text':128 'token':138 'unclear':171 'undocu':217 'unit':75 'usdc':15,30,47,77 'usdc-base-network' 'use':41 'util':144 'valid':104,146 'via':10,25 'wallet':200 'web3':133 'x':99 'x-payment':98 'x402':11,26,43,66,105 'x402 API' 'x402-payment'","prices":[{"id":"41d706c1-35bd-40fd-bcee-2e5419a73db9","listingId":"c02673ec-5079-400f-bcd8-cd9cc79fbcb1","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/products/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:54.354Z"}],"sources":[{"listingId":"c02673ec-5079-400f-bcd8-cd9cc79fbcb1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:54.354Z","lastSeenAt":"2026-04-22T13:30:28.793Z"}],"details":{"listingId":"c02673ec-5079-400f-bcd8-cd9cc79fbcb1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/53 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/53"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/53"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint 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 can settle USDC payments on Base","Users who want no-signup, no-API-key access to paid endpoints"],"notFor":["Users who need detailed API documentation or schemas before calling","Anyone without a Base-network USDC wallet","High-volume use cases where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.459Z"},"updatedAt":"2026-04-22T13:30:28.793Z"}}