{"id":"a89224e5-09f0-47fd-a216-c1678f87f301","shortId":"fnuUCr","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 provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform share a uniform $0.02/request pricing model settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/benefits/51` is listed under the title \"Premium API Access\" but the crawled documentation does not clarify what data or functionality this particular route returns — it does not appear in the site's publicly listed API catalog. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the x402 exact scheme with a 300-second timeout window.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) all resolve but contain only a \"Connect wallet\" prompt with no substantive technical content. Because there is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint returns, the listing carries significant uncertainty about its actual functionality.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-endpoint","no-api-key"],"categories":["general","api-gateway"],"synonyms":["premium API","lowpaymentfee","x402 API","USDC micropayment API","pay-per-call API","Base network API"],"warnings":["The endpoint /api/v1/benefits/51 does not appear in the site's publicly listed API catalog — its purpose is unclear.","All documentation pages (/docs, /pricing, /README) return only a 'Connect wallet' prompt with no technical content.","No OpenAPI schema, request body format, or response schema is available.","Functionality behind 'Premium API Access' is entirely undocumented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/51","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint /api/v1/benefits/51 is not listed in the site's public catalog. The actual functionality is 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'/docs':189 '/pricing':190 '/readme':191 '/request':83 '0.02':10,24,82,160 '000':149 '0x8335':154 '20':148 '2913':155 '300':171 '6':158 'Base network API' 'USDC micropayment API' 'accept':140 'access':6,20,36,104,186 'actual':231 'advertis':177 'ai':66 'analyt':65 'api':5,19,35,62,103,130,179 'appear':123 'base':8,22,91,150,157 'base-network' 'carri':226 'catalog':131 'challeng':134 'clarifi':111 'collect':56 'confirm':135 'connect':198 'contain':195 'content':205 'crawl':107 'data':64,113 'decim':159 'descript':217 'document':108,187 'endpoint':30,47,75,95,137,222 'exact':167 'exampl':214 'financ':69 'function':115,232 'gate':3,17 'host':54 'infrastructur':72 'instant':185 'key':180 'learn':68 'limit':183 'list':98,129,225 'live':139 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':67 'made':163 'mani':46 'model':85 'network':92 'no-api-key' 'offer':48 'one':44 'openapi':210 'page':188 'particular':117 'pay':9,23,59 'pay-per-call API' 'pay-per-request':58 'payment':40,146,161 'per':11,25,60 'platform':52,78,176 'post':141 'post-endpoint' 'premium':4,18,34,102 'premium API' 'price':84 'prompt':200 'protocol':41 'provid':33 'public':128 'rate':182 'request':12,26,61,142 'request/response':213 'requir':144 'resolv':193 'return':119,223 'rout':118 'schema':211 'scheme':168 'second':172 'settl':86 'share':79 'signific':227 'site':126 'span':63 'specif':94,221 'substant':203 'technic':204 'timeout':173 'titl':101 'uncertainti':228 'uniform':81 'unit':151 'usdc':14,28,88,153 'usdc-settlement' 'util':73 'via':37,164 'wallet':199 'web3':70 'window':174 'x402':2,16,39,133,166 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5cc49c7d-e478-4446-a1e7-6c9d495d5105","listingId":"a89224e5-09f0-47fd-a216-c1678f87f301","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:41.727Z"}],"sources":[{"listingId":"a89224e5-09f0-47fd-a216-c1678f87f301","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:41.727Z","lastSeenAt":"2026-04-22T06:04:17.720Z"}],"details":{"listingId":"a89224e5-09f0-47fd-a216-c1678f87f301","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/51 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/benefits/51"},{"claim":"Documentation pages resolve but contain only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without API key management","Programmatic pay-as-you-go access to undocumented premium features"],"bestFor":["Developers or agents already using x402 payment flows on Base","Users who want keyless, per-request API access","Exploring low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone requiring non-crypto payment methods","Use cases needing high-throughput batch access with predictable billing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.141Z"},"updatedAt":"2026-04-22T06:04:17.720Z"}}