{"id":"0c5da044-a82a-46df-b26e-ec36584d9eef","shortId":"Fwya4F","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","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/payments/261` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) 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 lowpaymentfee.com 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\nThis particular endpoint (`/api/v1/payments/261`) is labeled generically as \"Premium API Access\" and does not appear in the site's public endpoint catalog, so its exact functionality is unclear. It accepts POST requests and returns `application/json`. The x402 challenge is live and well-formed, settling to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["The endpoint /api/v1/payments/261 is not listed in the site's public API catalog; its actual functionality is unknown.","All documentation, pricing, API, and README pages return only a 'Connect wallet' prompt with no substantive content.","No OpenAPI schema, request format, or response examples are available.","The generic name 'Premium API Access' does not describe what the endpoint does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/261","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/payments/261","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works. However, the endpoint's actual functionality is unknown — it's labeled generically as 'Premium API Access' and doesn't match any cataloged endpoint. Documentation pages are empty (wallet-connect only), there's no OpenAPI spec, no request/response examples, and no description of what this specific endpoint 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'/request':13,32,166 '0.02':12,31,82,165 '000':76 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':216 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':219 '20':75 '6':86 'accept':54,198 'access':70,101,179 'across':122 'address':215 'advertis':92 'ai':132 'analysi':136 'analyt':126 'api':5,17,24,36,46,69,94,178 'appear':183 'application/json':203 'attach':104 'base':8,27,59,77,221 'base network api' 'beyond':224 'broader':117 'call':4,23,89 'caller':102 'catalog':190 'categori':124 'challeng':206 'charg':72 'classif':139 'connect':231 'content':237 'convers':156 'data':125,129 'decim':87 'document':222 'embed':140 'endpoint':63,121,159,171,189 'estim':150 'exact':193 'exchang':145 'export':130 'feed':144 'financ':141 'form':212 'four':123 'function':194 'gas':149 'generat':157 'generic':175 'geocod':154 'given':83 'header':109 'i.e':81 'infrastructur':152 'insight':131 'instant':100 'json-response' 'key':18,37,95 'label':174 'land':226 'learn':134 'limit':98 'list':66,161 'live':208 'low payment fee' 'lowpaymentfee.com':39,118 'machin':133 'metric':127 'micropayment api' 'network':9,28,60 'no-api-key' 'offer':120 'page':223,227 'particular':170 'pay':2,21,43 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':42 'payment':56,108,114 'per':3,22,44,88 'platform':6,25,47,91,119 'point':168 'post':199 'post-method' 'premium':68,177 'premium api access' 'price':143,167 'prompt':233 'proof':115 'protocol':52 'public':188 'quot':148 'rate':97,146 'report':128 'request':45,200 'requir':19,38 'return':202,228 'sentiment':135 'settl':213 'simpli':103 'site':186 'specif':62 'substant':236 'summar':138 'text':137 'token':147 'unclear':196 'unit':78 'usdc':15,34,55,80,84,218 'usdc api' 'usdc-base-network' 'use':49,217 'util':153 'valid':112,155 'via':10,29 'wallet':232 'web3':142 'well':211 'well-form':210 'x':107 'x-payment':106 'x402':11,30,51,113,205 'x402 api' 'x402-payment'","prices":[{"id":"97de0e7f-5010-408a-ad5d-a9a6db4a1698","listingId":"0c5da044-a82a-46df-b26e-ec36584d9eef","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/payments/261","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:05.740Z"}],"sources":[{"listingId":"0c5da044-a82a-46df-b26e-ec36584d9eef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/261","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:05.740Z","lastSeenAt":"2026-04-24T03:03:25.181Z"}],"details":{"listingId":"0c5da044-a82a-46df-b26e-ec36584d9eef","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/261 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/261"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/261"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without managing API keys or subscriptions","Agent-driven workflows that need to pay for API calls on-the-fly using USDC on Base","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-as-you-go API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users needing detailed documentation or OpenAPI schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.004Z"},"updatedAt":"2026-04-24T03:03:25.181Z"}}