{"id":"40b23274-1ac4-4e89-a87e-e03ae006edfe","shortId":"TkvRJ4","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"lowpaymentfee.com is an x402-enabled API platform offering a broad catalog of pay-per-call endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Each request costs $0.02 in USDC on the Base network, settled on-chain with no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/benefits/85` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. The endpoint accepts HTTP POST and returns `application/json`. Beyond the generic title, the crawled material does not document what data or functionality this particular endpoint provides — the site's docs, pricing, and README pages all render only a wallet-connect prompt with no additional content.\n\nThe platform advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same $0.02/request price point. However, no OpenAPI schema, request/response examples, or detailed documentation were found for any endpoint, including this one. Treat the actual payload structure as unknown until tested with a valid x402 payment.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","json-response","no-api-key","http-post"],"categories":["general","api-marketplace"],"synonyms":["premium API","pay-per-call API","x402 API","lowpaymentfee","USDC micropayment API","Base network API","on-chain API access"],"warnings":["No documentation available — docs, pricing, and README pages all render only a wallet-connect prompt with no content.","The endpoint title 'Premium API Access' is generic; the actual functionality behind /api/v1/benefits/85 is unknown.","No OpenAPI or output schema provided; request and response formats are undocumented.","This endpoint does not appear in the site's own listed catalog of APIs, raising questions about its purpose."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/85","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/benefits/85","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint name 'Premium API Access' is entirely generic — it is impossible to know what this endpoint actually does without paying for a 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'/request':198 '0.02':10,29,71,123,197 '000':112 '0x8335':117 '20':111 '2913':118 '6':121 'Base network API' 'USDC micropayment API' 'accept':128 'access':6,25,102 'across':57 'actual':220 'addit':170 'advertis':174 'ai':60 'analysi':179 'analyt':59 'api':5,24,45,84,101 'application/json':133 'base':8,27,76,113,120 'beyond':134 'broad':49 'call':55,125 'catalog':50 'chain':81 'challeng':107 'classif':182 'commit':92 'connect':166 'content':171 'convers':190 'cost':70 'crawl':139 'data':58,145 'decim':122 'detail':208 'doc':155 'document':143,209 'embed':183 'enabl':44 'endpoint':56,95,127,150,176,214 'exampl':206 'exchang':186 'feed':185 'financ':63 'found':211 'function':147 'gate':3,22 'generic':136 'geocod':188 'howev':201 'http':129 'http-post' 'includ':215 'infrastructur':66 'json-response' 'key':16,35,85 'learn':62 'limit':19,38,88 'list':98 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':61 'materi':140 'network':77 'no-api-key' 'offer':47 'on-chain':79 'on-chain API access' 'one':217 'openapi':203 'page':159 'particular':149 'pay':9,28,53 'pay-per-cal':52 'pay-per-call API' 'payload':221 'payment':231 'per':11,30,54,124 'per-request-billing' 'platform':46,173 'point':200 'post':130 'premium':4,23,100 'premium API' 'price':156,184,199 'prompt':167 'provid':151 'rate':18,37,87,187 'readm':158 'render':161 'request':12,31,69,108 'request/response':205 'return':104,132 'schema':204 'sentiment':178 'settl':78 'sibl':175 'site':153 'specif':94 'structur':222 'summar':181 'test':226 'text':180 'titl':137 'treat':218 'unit':114 'unknown':224 'upfront':91 'usdc':14,33,73,116 'usdc-base' 'util':67 'valid':189,229 'wallet':165 'wallet-connect':164 'web3':64 'x402':2,21,43,106,230 'x402 API' 'x402-enabled':42 'x402-gated':1,20 'x402-payment'","prices":[{"id":"dee92f7b-49c0-4de2-8355-9f126bdd7ac7","listingId":"40b23274-1ac4-4e89-a87e-e03ae006edfe","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/benefits/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T20:29:37.684Z"}],"sources":[{"listingId":"40b23274-1ac4-4e89-a87e-e03ae006edfe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/85","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T20:29:37.684Z","lastSeenAt":"2026-04-22T05:31:54.692Z"}],"details":{"listingId":"40b23274-1ac4-4e89-a87e-e03ae006edfe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/85 \\\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 an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equating to $0.02.","source_url":"https://lowpaymentfee.com/api/v1/benefits/85"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and README pages render only a wallet-connect prompt with no additional documentation.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API endpoint with on-chain USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API calls","Exploring x402 protocol integrations on the Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base for per-call access","Use cases requiring no-signup, no-rate-limit API consumption"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring free or fiat-billed API access","Anyone needing to understand the exact response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.517Z"},"updatedAt":"2026-04-22T05:31:54.692Z"}}