{"id":"87c7151b-6ac6-42fd-8124-656e89d10f8a","shortId":"KucUFW","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-76` is part of lowpaymentfee.com, a platform offering a variety of x402-gated API endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific endpoint is labeled \"Premium API Access\" and accepts POST requests, returning application/json responses. Payment is handled via the x402 protocol on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nThe platform advertises a flat $0.02 per request across its listed endpoints, though the x402 challenge for this particular endpoint specifies a maxAmountRequired of 20000 (in USDC's 6-decimal representation, this equals $0.02). The platform emphasizes no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nHowever, the actual functionality behind `/api/endpoint-76` is unclear. It does not appear in the site's listed API catalog (which uses `/api/v1/` and `/api/v2/` path patterns), and no documentation, input schema, or example responses are available. The docs, pricing, and other subpages returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint does, callers should treat it as an opaque premium endpoint with unverified capabilities.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","post-method"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC gated endpoint","Base network API","micropayment API","lowpaymentfee"],"warnings":["Endpoint /api/endpoint-76 is not listed in the site's public API catalog — its actual functionality is unknown.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content.","No input schema or output schema is provided; callers cannot know what request body to send or what response to expect.","The description 'Premium API Access' is generic and does not describe any specific capability."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-76","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-76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and payment terms are clear, but there is zero documentation on what the endpoint actually does, no input/output schema, and the endpoint path does not match any of the site's cataloged APIs. Docs pages are empty. This is effectively a stub 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'/api/v1':170 '/api/v2':172 '0.02':94,122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':88 '20000':113 '6':117 'Base network API' 'USDC gated endpoint' 'accept':68 'access':66,134 'across':97 'actual':151 'advertis':91 'ai':51 'analyt':50 'api':5,19,46,65,127,166 'appear':160 'application/json':72 'attach':137 'avail':184 'base':8,22,83 'base-network' 'behind':153 'caller':135,207 'capabl':218 'catalog':167 'challeng':104 'connect':194 'content':200 'contract':87 'data':49 'decim':118 'doc':186 'document':177 'emphas':125 'endpoint':6,20,30,47,61,100,108,205,215 'equal':121 'exampl':181 'financ':54 'flat':93 'function':152 'gate':3,17,45 'handl':76 'header':142 'howev':149 'infrastructur':57 'input':178 'instant':133 'json-response' 'key':128 'know':202 'label':63 'learn':53 'limit':131 'list':99,165 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':52 'maxamountrequir':111 'micropayment API' 'network':84 'offer':39 'opaqu':213 'part':34 'particular':107 'path':173 'pattern':174 'pay':10,24 'pay-per-call API' 'pay-per-request':9,23 'payment':74,141,147 'per':11,25,95 'platform':38,90,124 'post':69 'post-method' 'premium':4,18,64,214 'price':187 'prompt':196 'proof':148 'protocol':80 'rate':130 'represent':119 'request':12,26,70,96 'respons':73,182 'return':71,191 'schema':179 'simpli':136 'site':163 'span':48 'specif':60 'specifi':109 'subpag':190 'substant':199 'though':101 'treat':209 'unclear':156 'unverifi':217 'usdc':14,28,86,115 'usdc-payment' 'use':85,169 'util':58 'valid':145 'varieti':41 'via':77 'wallet':195 'web3':55 'without':201 'x':140 'x-payment':139 'x402':2,16,44,79,103,146 'x402 API' 'x402-gated':1,15,43 'x402-payment'","prices":[{"id":"0bead196-78a3-442e-a9b6-81a8925a562f","listingId":"87c7151b-6ac6-42fd-8124-656e89d10f8a","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-76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:48.889Z"}],"sources":[{"listingId":"87c7151b-6ac6-42fd-8124-656e89d10f8a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:48.889Z","lastSeenAt":"2026-04-23T05:00:36.877Z"}],"details":{"listingId":"87c7151b-6ac6-42fd-8124-656e89d10f8a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-76 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns status 402 with maxAmountRequired of 20000 USDC on Base network.","source_url":"https://lowpaymentfee.com/api/endpoint-76"},{"claim":"The platform lists APIs at $0.02/request with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/endpoint-76"},{"claim":"Docs, pricing, and README pages returned only 'Connect wallet' with no documentation content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API service via x402 micropayments","Agent-driven API consumption without API key registration","On-chain pay-per-request access on Base"],"bestFor":["Developers or agents wanting keyless, pay-per-request API access","x402-compatible agents on the Base network","Users who prefer USDC micropayments over subscription billing"],"notFor":["Users who need documented input/output schemas before calling","Anyone requiring free or trial access to evaluate functionality","Use cases requiring high-throughput with predictable flat-rate pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:02.036Z"},"updatedAt":"2026-04-23T05:00:36.877Z"}}