{"id":"9f1f2be2-7f19-47bc-bec4-bb7d06b4437d","shortId":"qpkbJT","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/ML inference, finance/Web3, and infrastructure utilities. All endpoints are gated via the x402 payment protocol on the Base network, accepting USDC (USD Coin) at $0.02 per request. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/benefits/50` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02. The endpoint accepts POST requests and settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The x402 version is 1 with a 300-second payment timeout.\n\nNote that while the landing page advertises many endpoint categories (sentiment analysis, text summarization, embeddings, price feeds, geocoding, etc.), the crawled documentation pages returned only \"Connect wallet\" with no further technical detail. The actual functionality behind `/api/v1/benefits/50` is unclear — the name \"Premium API Access\" is generic and no request/response schema is documented. Prospective callers should test the endpoint to verify what data or service it actually provides.","tags":[],"capabilities":["x402-payment-gating","usdc-base-settlement","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The actual functionality of /api/v1/benefits/50 is undocumented — 'Premium API Access' is a generic label with no specification of what data or service is returned.","All documentation, pricing, API, and README pages returned only 'Connect wallet' with no substantive content.","No request body schema or response schema is available; callers must discover behavior empirically."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/50","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documented request/response format, and the actual functionality behind 'Premium API Access' at /api/v1/benefits/50 is entirely undocumented. All docs pages returned only 'Connect wallet' with no 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'0.02':10,29,84,140 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '1':158 '20':130 '300':161 '6':136 'Base network API' 'USDC micropayment API' 'accept':79,143 'access':6,25,118,208 'across':57 'actual':198,230 'address':150 'advertis':125,171 'ai/ml':60 'amount':128 'analysi':176 'analyt':59 'api':5,24,45,90,117,207 'application/json':121 'attach':101 'base':8,27,77,132,153 'behind':200 'broad':49 'call':55 'caller':99,218 'catalog':50 'categori':174 'challeng':124 'coin':82 'commit':98 'connect':190 'crawl':185 'crypto-paid API' 'data':58,226 'decim':137 'detail':196 'document':186,216 'embed':179 'enabl':44 'endpoint':56,67,111,142,173,222 'equal':139 'etc':183 'feed':181 'finance/web3':62 'function':199 'gate':3,22,69 'generic':210 'geocod':182 'header':105 'infer':61 'infrastructur':64 'json-response' 'key':16,35,91 'land':169 'limit':19,38,94 'list':114 'lowpaymentfee' 'lowpaymentfee.com':39 'mani':172 'maximum':127 'name':205 'network':78 'no-api-key' 'note':165 'offer':47 'page':170,187 'pay':9,28,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request' 'payment':73,104,148,163 'per':11,30,54,85 'platform':46 'post':144 'post-method' 'premium':4,23,116,206 'premium API access' 'price':180 'prospect':217 'protocol':74 'provid':231 'rate':18,37,93 'request':12,31,86,108,145 'request/response':213 'return':120,188 'schema':214 'second':162 'sentiment':175 'servic':228 'settl':147 'simpli':100 'specif':110 'subscript':97 'summar':178 'technic':195 'test':220 'text':177 'timeout':164 'unclear':203 'unit':133 'usd':81 'usdc':14,33,80,135 'usdc-base-settlement' 'util':65 'verifi':224 'version':156 'via':70 'wallet':191 'x402':2,21,43,72,103,123,155 'x402 API' 'x402-enabled':42 'x402-gated':1,20 'x402-payment-gating'","prices":[{"id":"3568899f-7bd0-4645-a881-109ea2ad6cdd","listingId":"9f1f2be2-7f19-47bc-bec4-bb7d06b4437d","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:33.465Z"}],"sources":[{"listingId":"9f1f2be2-7f19-47bc-bec4-bb7d06b4437d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:33.465Z","lastSeenAt":"2026-04-22T05:31:53.789Z"}],"details":{"listingId":"9f1f2be2-7f19-47bc-bec4-bb7d06b4437d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/50 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/50"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/50"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls settled instantly in USDC on Base","Integrating pay-per-request endpoints into agent workflows via x402"],"bestFor":["Developers who want zero-friction API access without signup","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation and schemas before integrating","High-volume callers who would benefit from bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.516Z"},"updatedAt":"2026-04-22T05:31:53.789Z"}}