{"id":"3f3ff4b3-7861-45f6-88e6-d10d57923364","shortId":"9x3wxt","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint at `/api/v1/benefits/45` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The endpoint is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network via the x402 exact-payment scheme.\n\nThe x402 challenge confirms the endpoint is live and requires a maximum payment of 20,000 base units of USDC (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. No API keys are required; payment is handled inline via the X-PAYMENT header. The platform advertises no rate limits and instant access.\n\nThe specific functionality behind `/api/v1/benefits/45` is not documented beyond the generic \"Premium API Access\" label. The site's docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no usage examples available. Without further documentation it is unclear what data or service this particular endpoint returns, making it difficult to assess its practical utility.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-endpoint","no-api-key"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","premium access endpoint"],"warnings":["The specific functionality of /api/v1/benefits/45 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI spec, request schema, or response schema is provided.","All documentation pages (docs, pricing, README, api) render only a 'Connect wallet' prompt with no usable content.","The broader lowpaymentfee.com platform lists many endpoints but none have detailed docs visible without wallet connection."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/45","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/45","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 purpose of '/api/v1/benefits/45' is entirely opaque beyond the generic 'Premium API Access' label. Docs pages render only wallet-connect 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'/request':17,34,140 '0.02':16,33,127,139 '000':110 '0x8335':115 '20':109 '2913':116 '6':122 'Base network API' 'USDC micropayment API' 'accept':77 'access':75,167,181 'across':141 'addit':200 'advertis':135,161 'ai':61 'analyt':60 'api':5,22,57,74,145,180 'assess':233 'avail':214 'base':8,25,86,111,118 'base-network' 'behind':171 'beyond':176 'call':12,29 'challeng':97 'collect':48 'confirm':98 'connect':195 'consist':130 'content':201 'data':59,222 'decim':123 'difficult':231 'doc':186 'document':175,217 'endpoint':6,23,36,70,100,143,227 'exact':92 'exact-pay':91 'exampl':213 'financ':64 'flat':136 'function':170 'gate':3,20 'generic':178 'handl':151 'header':158 'infrastructur':67 'inlin':152 'instant':166 'key':146 'label':72,182 'learn':63 'limit':164 'live':102 'lowpaymentfee' 'lowpaymentfee.com':43 'machin':62 'make':229 'maximum':106 'network':87 'no-api-key' 'offer':46 'openapi':205 'page':190 'part':40 'particular':226 'pay':10,27,54 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':53 'payment':81,93,107,149,157 'per':11,28,55,128 'platform':44,160 'post':78 'post-endpoint' 'practic':235 'premium':4,21,73,179 'premium access endpoint' 'price':137,187 'prompt':197 'protocol':52 'rate':163 'readm':189 'render':192 'request':56,79,129 'request/response':208 'requir':104,148 'return':228 'schema':209 'scheme':94 'servic':224 'settl':80 'sinc':119 'site':133,184 'span':58 'spec':206 'specif':169 'translat':125 'unclear':220 'unit':112 'usag':212 'usdc':14,31,83,114,120 'usdc-settlement' 'use':121 'util':68,236 'via':88,153 'wallet':196 'web3':65 'without':215 'x':156 'x-payment':155 'x402':2,19,51,90,96 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':50","prices":[{"id":"7d9609d3-5f4b-4018-a355-19408c12258f","listingId":"3f3ff4b3-7861-45f6-88e6-d10d57923364","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:44.050Z"}],"sources":[{"listingId":"3f3ff4b3-7861-45f6-88e6-d10d57923364","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:44.050Z","lastSeenAt":"2026-04-22T01:01:58.659Z"}],"details":{"listingId":"3f3ff4b3-7861-45f6-88e6-d10d57923364","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/45 \\\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/45"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/45"},{"claim":"Platform advertises $0.02/request flat pricing, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, README, and API pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Exploring x402 protocol integrations for automated payment-gated services"],"bestFor":["Developers experimenting with x402 pay-per-request patterns","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-API-key access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.014Z"},"updatedAt":"2026-04-22T01:01:58.659Z"}}