{"id":"07324143-1666-4b91-95e6-b19aaaf65e5c","shortId":"gGvswn","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-69` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The endpoint is labeled \"Premium API Access\" and accepts POST requests, returning application/json responses. Payment is handled via the x402 exact scheme on the Base network using USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nThe specific endpoint `/api/endpoint-69` does not appear in the site's publicly listed API catalog, which enumerates endpoints under `/api/v1/` and `/api/v2/` paths at $0.02 per request. The x402 challenge for this endpoint specifies a maxAmountRequired of 20000 (in USDC's 6-decimal representation, this equals $0.02), consistent with the site's advertised flat pricing. The platform advertises no API keys, no rate limits, and instant access — all authentication and billing is handled through the x402 payment header.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint actually does. The endpoint is confirmed live (402 challenge returned), but without documentation it is impossible to determine the endpoint's actual functionality beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","post-method"],"categories":["api","misc"],"synonyms":["premium API","pay-per-request API","x402 endpoint","USDC API","Base network API","lowpaymentfee"],"warnings":["Endpoint /api/endpoint-69 is not listed among the site's publicly documented APIs","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","No request or response schema available — actual functionality is unknown","Cannot verify what 'Premium API Access' actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-69","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-69","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 the endpoint actually does, no request/response schema, and the endpoint path does not match any of the publicly listed APIs. Effectively a stub 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'/api/v1':111 '/api/v2':113 '0.02':116,138 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':91 '20000':129 '402':215 '6':133 'Base network API' 'USDC API' 'accept':70 'access':68,158,236 'actual':208,229 'advertis':144,149 'ai/ml':55 'analyt':54 'api':5,19,51,67,105,151,176,235 'appear':98 'application/json':74 'asset':90 'authent':160 'base':8,22,86 'base-network' 'beyond':231 'bill':162 'catalog':106 'challeng':121,216 'collect':42 'confirm':213 'connect':185 'consist':139 'content':191 'data':53,58 'decim':134 'descript':202 'determin':225 'doc':175 'document':170,220 'endpoint':6,20,30,63,94,109,124,207,211,227 'enumer':108 'equal':137 'exact':82 'exampl':199 'extrem':172 'finance/web3':57 'flat':145 'function':230 'gate':3,17 'generic':233 'handl':78,164 'header':169 'imposs':223 'infer':56 'infrastructur':60 'instant':157 'json-response' 'key':152 'label':65,237 'limit':155 'list':104 'live':214 'lowpaymentfee' 'lowpaymentfee.com':37 'maxamountrequir':127 'network':87 'offer':40 'openapi':195 'page':180 'part':34 'particular':206 'path':114 'pay':10,24,48 'pay-per-request':9,23,47 'pay-per-request API' 'payment':76,168 'per':11,25,49,117 'platform':38,148 'post':71 'post-method' 'premium':4,18,66,234 'premium API' 'price':146,177 'prompt':187 'protocol':46 'public':103 'rate':154 'readm':179 'render':182 'represent':135 'request':12,26,50,72,118 'request/response':198 'respons':75 'return':73,217 'schema':196 'scheme':83 'site':101,142 'span':52 'spars':173 'specif':93 'specifi':125 'substant':190 'usdc':14,28,89,131 'usdc-payment' 'use':88 'util':61 'via':79 'wallet':186 'without':219 'x402':2,16,45,81,120,167 'x402 endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"b07e2ea7-c480-445b-97cd-13a3d3982690","listingId":"07324143-1666-4b91-95e6-b19aaaf65e5c","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-69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:56.661Z"}],"sources":[{"listingId":"07324143-1666-4b91-95e6-b19aaaf65e5c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:56.661Z","lastSeenAt":"2026-04-22T13:30:14.777Z"}],"details":{"listingId":"07324143-1666-4b91-95e6-b19aaaf65e5c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-69 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies maxAmountRequired of 20000 USDC on Base with exact scheme","source_url":"https://lowpaymentfee.com/api/endpoint-69"},{"claim":"The site lists APIs under /api/v1/ and /api/v2/ paths but not /api/endpoint-69","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a pay-per-request API without API key registration","Making micropayments for API calls using USDC on Base","Agent-driven API consumption via x402 protocol"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can handle x402 payment flows","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing documented request/response schemas before integration","Use cases requiring free or trial access to evaluate functionality","Production systems that need SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T08:30:40.163Z"},"updatedAt":"2026-04-22T13:30:14.777Z"}}