{"id":"56a78a40-aa84-4882-ba17-ae63b4618dfe","shortId":"jxcRxq","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com is part of a broader suite of x402-protocol APIs covering data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities. The specific endpoint `/api/v1/benefits/39` is listed as \"Premium API Access\" and is gated behind an x402 payment challenge requiring USDC on the Base network.\n\nThe x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (contract 0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required. The timeout window is 300 seconds.\n\nThe site lists numerous sibling endpoints across categories (sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, etc.), all at the same $0.02 price point. However, the specific functionality behind `/api/v1/benefits/39` is not documented beyond the label \"Premium API Access.\" No OpenAPI schema, request/response examples, or detailed documentation were found — the docs, pricing, and README pages all rendered only a wallet-connect prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api","infrastructure"],"synonyms":["premium API","paid API access","x402 API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The specific functionality of /api/v1/benefits/39 is unknown — 'Premium API Access' is not described anywhere in the crawled material.","No OpenAPI schema, request body format, or response examples are available.","All documentation pages (docs, pricing, README, api) rendered only a wallet-connect prompt with no substantive content.","The endpoint path '/api/v1/benefits/39' does not appear in the site's listed API catalog, suggesting it may be an unlisted or internal route."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/39","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, the actual functionality behind '/api/v1/benefits/39' is entirely undocumented — no schema, no examples, no description beyond the generic label 'Premium API Access.' Docs pages returned only wallet-connect prompts with no 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'/request':118 '0.02':10,24,105,117,172 '000':87 '0x8335':93 '20':86 '2913':94 '300':145 '6':100 'Base network API' 'USDC API' 'access':6,20,64,189 'across':119,153 'advertis':82,113 'ai/ml':47 'analysi':156 'analyt':46 'api':5,19,43,63,132,188 'base':8,22,77,88,96 'behind':68,179 'beyond':184 'broader':37 'categori':154 'challeng':72,81 'classif':159 'connect':212 'consist':108 'content':217 'contract':92 'cover':44 'data':45,51 'decim':101 'detail':196 'doc':201 'document':183,197 'embed':160 'endpoint':30,57,121,152 'etc':167 'exact':128 'exampl':194 'exchang':163 'feed':162 'financ':49 'flat':114 'found':199 'function':178 'gate':3,17,67 'geocod':165 'howev':175 'infer':48 'infrastructur':53 'json-response' 'key':133 'label':186 'limit':136 'list':60,149 'lowpaymentfee' 'lowpaymentfee.com':32 'made':124 'maxamountrequir':84 'micropayment API' 'network':78 'no-api-key' 'no-rate-limit' 'numer':150 'openapi':191 'page':205 'paid API access' 'part':34 'pay':9,23 'pay-per-request' 'payment':71,122 'per':11,25,106 'point':174 'premium':4,18,62,187 'premium API' 'price':115,161,173,202 'prompt':213 'protocol':42 'rate':135,164 'readm':204 'render':207 'request':12,26,107 'request/response':193 'requir':73,140 'schema':192 'scheme':129 'second':146 'sentiment':155 'sibl':151 'sinc':97 'site':111,148 'specif':56,177 'subscript':139 'substant':216 'suit':38 'summar':158 'text':157 'timeout':142 'translat':103 'unit':89 'usdc':14,28,74,91,98 'usdc-base' 'use':99 'util':54 'valid':166 'via':125 'wallet':211 'wallet-connect':210 'web3':50 'window':143 'x402':2,16,41,70,80,127 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':40","prices":[{"id":"d5c9851a-aec8-4745-952a-3ab5f4b11ab5","listingId":"56a78a40-aa84-4882-ba17-ae63b4618dfe","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:36.521Z"}],"sources":[{"listingId":"56a78a40-aa84-4882-ba17-ae63b4618dfe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:36.521Z","lastSeenAt":"2026-04-22T04:02:19.513Z"}],"details":{"listingId":"56a78a40-aa84-4882-ba17-ae63b4618dfe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/39 \\\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 site advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requires 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equating to $0.02.","source_url":"https://lowpaymentfee.com/api/v1/benefits/39"},{"claim":"The site lists sibling endpoints across data & analytics, AI/ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-call API without needing API keys or subscriptions","Programmatic agent-driven API consumption settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","Anyone requiring free or trial access to evaluate the endpoint's output","Use cases needing guaranteed SLAs or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.39Z"},"updatedAt":"2026-04-22T04:02:19.513Z"}}