{"id":"05625139-5cfc-4440-a737-5d1f6455f9dd","shortId":"mFTedt","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/endpoint-17` is part of the lowpaymentfee.com platform, which offers a collection of x402 protocol-gated APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The endpoint is labeled \"Premium API Access\" but its specific functionality is not documented — it does not correspond to any of the named endpoints listed on the provider's homepage (which use `/api/v1/` and `/api/v2/` path prefixes).\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The challenge indicates a maximum amount of 20,000 units (in USDC's 6-decimal representation, this equals $0.02 per request), consistent with the site-wide $0.02/request pricing. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is gated entirely by the x402 payment header.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint does. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without knowing what it actually computes or returns, practical utility is uncertain.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","post-method"],"categories":["api","x402"],"synonyms":["lowpaymentfee","premium api","x402 api","usdc api","base network api","pay-per-call api","micropayment api"],"warnings":["Endpoint functionality is completely undocumented — 'Premium API Access' is the only description available","This endpoint path (/api/endpoint-17) does not appear in the provider's listed API catalog","All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no content","No request or response schema available; callers cannot know what to send or expect back"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-17","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/endpoint-17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what it actually does. No input/output schema, no examples, and the endpoint path doesn't match any of the named APIs on the site. This is effectively a stub 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'/api/v1':92 '/api/v2':94 '/request':140 '0.02':130,139 '000':120 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':111 '20':119 '402':213 '6':125 'accept':144 'access':66,158 'actual':224 'advertis':157 'ai':52 'amount':117 'analyt':51 'api':5,19,48,65,151,174 'application/json':149 'base':8,22,106 'base network api' 'challeng':113,218 'collect':42 'comput':225 'confirm':210 'connect':183 'consist':133 'content':189 'contract':110 'correspond':77 'crawl':172 'data':50 'decim':126 'descript':200 'doc':173 'document':73,167 'endpoint':6,20,30,61,83,143,205,208 'entir':161 'equal':129 'exampl':197 'extrem':169 'financ':55 'function':70 'gate':3,17,47,160 'handl':99 'header':166 'homepag':89 'indic':114 'infrastructur':58 'json-response' 'key':152 'know':221 'label':63 'learn':54 'limit':155 'list':84 'live':211 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':53 'maximum':116 'micropayment api' 'name':82 'network':107 'offer':40 'openapi':193 'page':178 'part':34 'path':95 'pay':10,24 'pay-per-call api' 'pay-per-request':9,23 'payment':97,165 'per':11,25,131 'platform':38 'post':145 'post-method' 'practic':228 'prefix':96 'premium':4,18,64 'premium api' 'price':141,175 'prompt':185 'protocol':46,103 'protocol-g':45 'provid':87 'rate':154 'readm':177 'represent':127 'request':12,26,132,146 'request/response':196 'return':148,180,212,227 'schema':194 'site':137 'site-wid':136 'span':49 'spars':170 'specif':69,204 'substant':188 'uncertain':231 'unit':121 'usdc':14,28,109,123 'usdc api' 'usdc-base-network' 'use':91,108 'util':59,229 'valid':216 'via':100 'wallet':184 'web3':56 'wide':138 'without':220 'x402':2,16,44,102,164,217 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"9952458d-10ba-4e5e-b574-8a21a49ee5c8","listingId":"05625139-5cfc-4440-a737-5d1f6455f9dd","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/endpoint-17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:53.039Z"}],"sources":[{"listingId":"05625139-5cfc-4440-a737-5d1f6455f9dd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:53.039Z","lastSeenAt":"2026-04-23T05:00:37.082Z"}],"details":{"listingId":"05625139-5cfc-4440-a737-5d1f6455f9dd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-17 \\\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 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000","source_url":"https://lowpaymentfee.com/api/endpoint-17"},{"claim":"Site-wide pricing is $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 lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/endpoint-17"}],"useCases":["Programmatic access to an x402-gated endpoint with USDC micropayments on Base","Agent-driven API consumption without API keys or subscriptions","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 protocol integrations","Agents that need keyless, pay-per-request API access on Base","Exploring micropayment-gated API patterns"],"notFor":["Users who need documented, well-specified API contracts","Production workloads requiring known input/output schemas","Anyone needing free or non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:01.386Z"},"updatedAt":"2026-04-23T05:00:37.082Z"}}