{"id":"075853c5-5598-4950-b231-fd0175e4d65c","shortId":"KUS4Wm","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","description":"This endpoint at `/api/v1/customers/28` is part of the lowpaymentfee.com platform, which offers a suite of x402-protocol APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities. The specific endpoint is labeled \"Premium API Access\" and is gated behind an x402 payment challenge requiring USDC on the Base network.\n\nThe platform advertises a flat $0.02 per request pricing model across most of its endpoints, though this particular endpoint's x402 challenge specifies a `maxAmountRequired` of 20000 (in USDC's 6-decimal representation, equating to $0.02). Payment is made via the x402 exact scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. No API keys or rate limits are advertised; access is instant upon payment.\n\nThe exact functionality of the `/api/v1/customers/28` endpoint is unclear from available documentation. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. The endpoint accepts POST requests and returns `application/json`. Without further documentation or example responses, the specific data returned by this endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-on-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["api","web3"],"synonyms":["premium API","x402 API","USDC pay-per-call","lowpaymentfee","Base network API","crypto-gated API","402 payment endpoint"],"warnings":["The exact purpose and response format of /api/v1/customers/28 is undocumented and unclear","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content","No OpenAPI spec, request schema, or response schema available","The endpoint path suggests customer-specific data which may have privacy implications"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/28","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/customers/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment. However, the specific functionality of /api/v1/customers/28 is undocumented—no request/response schema, no examples, and all doc pages returned only 'Connect wallet' with no content. The endpoint's purpose is essentially unknown beyond its 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'0.02':85,115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':129 '20000':106 '402 payment endpoint' '6':110 'Base network API' 'USDC pay-per-call' 'accept':177 'access':65,140 'across':90 'address':125 'advertis':82,139 'ai/ml':51 'analyt':50 'api':5,19,47,64,133 'application/json':182 'avail':155 'base':8,22,78,131 'behind':69 'cannot':196 'challeng':73,101 'confirm':198 'connect':168 'content':174 'crawl':158 'crypto-gated API' 'data':49,191 'decim':111 'doc':159 'document':156,185 'endpoint':6,20,30,60,94,98,151,176,195 'equat':113 'exact':122,146 'exampl':187 'financ':53 'flat':84 'function':147 'gate':3,17,68 'infer':52 'infrastructur':56 'instant':142 'json-response' 'key':134 'label':62 'limit':137 'lowpaymentfee' 'lowpaymentfee.com':37 'made':118 'maxamountrequir':104 'model':89 'network':79 'no-api-key' 'offer':40 'page':163 'part':34 'particular':97 'pay':10,24 'pay-per-request':9,23 'payment':72,116,144 'per':11,25,86 'platform':38,81 'post':178 'post-method' 'premium':4,18,63 'premium API' 'price':88,160 'prompt':170 'protocol':46 'rate':136 'readm':162 'represent':112 'request':12,26,87,179 'requir':74 'respons':188 'return':165,181,192 'scheme':123 'span':48 'specif':59,190 'specifi':102 'substant':173 'suit':42 'though':95 'unclear':153 'upon':143 'usdc':14,28,75,108,128 'usdc-on-base' 'use':127 'util':57 'via':119 'wallet':169 'web3':54 'without':183 'x402':2,16,45,71,100,121 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"5934ad3d-f23e-4fa2-96ab-de6fabd2e1be","listingId":"075853c5-5598-4950-b231-fd0175e4d65c","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/customers/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:17.726Z"}],"sources":[{"listingId":"075853c5-5598-4950-b231-fd0175e4d65c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:17.726Z","lastSeenAt":"2026-04-23T02:00:19.214Z"}],"details":{"listingId":"075853c5-5598-4950-b231-fd0175e4d65c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/28 \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge specifies maxAmountRequired of 20000 USDC units on Base, paid to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/customers/28"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/28"}],"useCases":["Accessing premium data or customer records behind a micropayment wall","Demonstrating x402 protocol payment flows for agent-to-agent commerce","Integrating pay-per-request APIs without traditional API key management"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can autonomously pay USDC for API access","Use cases requiring keyless, pay-as-you-go API consumption"],"notFor":["Users needing well-documented API contracts with clear response schemas","High-volume use cases where per-request crypto payments add overhead","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.065Z"},"updatedAt":"2026-04-23T02:00:19.214Z"}}