{"id":"b349b0b1-3568-4cfd-b380-96110a84241b","shortId":"mNCFHG","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-16` 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, 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 exact scheme on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nThe platform advertises a flat $0.02 per request across its listed endpoints, though this particular endpoint's x402 challenge specifies a maxAmountRequired of 20000 (in USDC's 6-decimal representation, equaling $0.02). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The platform lists 16 other endpoints covering metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation.\n\nHowever, `/api/endpoint-16` does not correspond to any of the named endpoints on the site's landing page (which use paths like `/api/v1/...` and `/api/v2/...`). There is no documentation, input schema, or example request/response available for this specific endpoint. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content. As a result, the actual functionality behind this endpoint is unknown and cannot be verified beyond confirming it is live and returns a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","http-post","json-response"],"categories":["general","api-gateway"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","base network api","premium api access"],"warnings":["Endpoint path /api/endpoint-16 does not match any of the named endpoints listed on the provider's landing page","No documentation, input schema, or output schema available for this endpoint","Docs, pricing, and API pages render only 'Connect wallet' with no usable content","Actual functionality behind this endpoint is unknown and unverifiable"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-16","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-16","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 402 challenge, but '/api/endpoint-16' does not match any documented endpoint on the site. No input schema, output schema, documentation, or examples exist. The actual functionality is completely unknown, making this effectively a stub 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'/api/v1':196 '/api/v2':198 '0.02':98,124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '16':150 '20000':116 '402':254 '6':120 'USDC micropayment api' 'accept':71 'access':69 'across':101 'actual':234 'addit':228 'advertis':95 'ai/ml':55 'analysi':157 'analyt':54 'api':5,19,51,68,126,217 'application/json':75 'attach':135 'avail':208 'base':8,22,87 'base network api' 'behind':236 'beyond':245 'caller':133 'cannot':242 'challeng':111,255 'classif':160 'collect':42 'confirm':246 'connect':223 'content':229 'contract':91 'convers':172 'correspond':179 'cover':153 'data':53 'decim':121 'doc':214 'document':202 'embed':161 'endpoint':6,20,30,64,104,108,152,185,212,238 'equal':123 'estim':169 'exact':83 'exampl':206 'exchang':164 'feed':163 'financ':57 'flat':97 'function':235 'gas':168 'gate':3,17 'generat':174 'geocod':170 'handl':79 'header':140 'howev':175 'http-post' 'infer':56 'infrastructur':60 'input':203 'json-response' 'key':127 'label':66 'land':190 'like':195 'limit':130 'list':103,149 'live':249 'lowpaymentfee' 'lowpaymentfee.com':37 'maxamountrequir':114 'metric':154 'name':184 'network':88 'offer':40 'page':191,218 'part':34 'particular':107 'path':194 'pay':10,24,48 'pay-per-call api' 'pay-per-request':9,23,47 'payment':77,139,145 'per':11,25,49,99 'platform':38,94,148 'post':72 'premium':4,18,67 'premium api access' 'price':162,215 'prompt':225 'proof':146 'protocol':46 'quot':167 'rate':129,165 'render':220 'report':155 'represent':122 'request':12,26,50,73,100 'request/response':207 'requir':132 'respons':76 'result':232 'return':74,251 'schema':204 'scheme':84 'sentiment':156 'simpli':134 'site':188 'span':52 'specif':63,211 'specifi':112 'summar':159 'text':158 'though':105 'token':166 'unknown':240 'usdc':14,28,90,118 'usdc-base-network' 'use':89,193 'util':61 'valid':143,171,253 'verifi':244 'via':80 'wallet':224 'web3':58 'x':138 'x-payment':137 'x402':2,16,45,82,110,144 'x402 api' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"12e9874e-0e93-4761-b77b-387f0dbeeb58","listingId":"b349b0b1-3568-4cfd-b380-96110a84241b","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-16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:54.230Z"}],"sources":[{"listingId":"b349b0b1-3568-4cfd-b380-96110a84241b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:54.230Z","lastSeenAt":"2026-04-22T15:00:21.328Z"}],"details":{"listingId":"b349b0b1-3568-4cfd-b380-96110a84241b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-16 \\\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 specifies maxAmountRequired of 20000 USDC on Base network with exact scheme","source_url":"https://lowpaymentfee.com/api/endpoint-16"},{"claim":"The platform lists endpoints 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-16"},{"claim":"The site lists 16 named endpoints under paths /api/v1/ and /api/v2/, none matching /api/endpoint-16","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to an unknown premium API service via x402 micropayments","Agent-driven pay-per-request workflows on the Base network","Testing x402 payment protocol integrations"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-request API access on Base","Micropayment-gated API consumption without subscriptions"],"notFor":["Users who need documented input/output schemas before calling","Production workloads requiring SLA guarantees or detailed documentation","Anyone needing free or trial access to evaluate functionality first"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:01.523Z"},"updatedAt":"2026-04-22T15:00:21.328Z"}}