{"id":"448fe5de-b136-4420-8f17-eb462135c4a3","shortId":"WWgWux","kind":"x402","title":"x402-gated premium API endpoint on Base, paid per-request in USDC.","tagline":"x402-gated premium API endpoint on Base, paid per-request in USDC.","description":"This endpoint at `/api/v1/carts/6` 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 `/api/v1/carts/6` resource is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. The endpoint is live and returns a valid x402 challenge.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with the \"exact\" payment scheme. The maximum amount required per request is 20,000 units (in USDC's 6-decimal representation, this equals $0.02). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The response MIME type is `application/json` and the endpoint accepts HTTP POST.\n\nThe broader lowpaymentfee.com platform lists 16+ endpoints across categories like sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more — all at the same $0.02/request price point. However, documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas, parameter descriptions, and example payloads are unavailable.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","http-post"],"categories":["api-gateway","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["The exact functionality of /api/v1/carts/6 is unknown — 'Premium API Access' is the only description available.","All documentation pages (/docs, /pricing, /README, /api) returned no substantive content, only a 'Connect wallet' prompt.","No request or response schema is available; callers cannot determine what parameters to send or what data to expect.","The platform lists many endpoints but none appear to have public documentation beyond titles and prices."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/6","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/carts/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific resource '/api/v1/carts/6' has no documented purpose beyond the generic label 'Premium API Access'. All documentation pages returned only 'Connect wallet' with no schemas, examples, or parameter descriptions. The listing is effectively a 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'/docs':197 '/pricing':198 '/readme':199 '/request':191 '0.02':125,190 '000':115 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':101 '16':169 '20':114 '6':120 'Base network API' 'USDC micropayment API' 'accept':161 'access':70,137 'across':171 'advertis':128 'ai/ml':55 'amount':109 'analysi':175 'analyt':54 'api':5,19,51,69,130 'application/json':157 'attach':140 'base':8,22,96 'base-network' 'beyond':78 'broader':165 'caller':138 'categori':172 'challeng':90 'collect':42 'connect':203 'content':209 'contract':100 'data':53 'decim':121 'descript':215 'detail':211 'document':77,195 'embed':178 'endpoint':6,20,30,82,160,170 'equal':124 'estim':182 'exact':73,104 'exampl':217 'feed':180 'financ':57 'function':74 'gas':181 'gate':3,17 'geocod':183 'header':145 'howev':194 'http':162 'http-post' 'infer':56 'infrastructur':60 'instant':136 'json-response' 'key':131 'label':67,80 'like':173 'limit':134 'list':168 'live':84 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37,166 'maximum':108 'mime':154 'network':97 'offer':40 'page':196 'paid':9,23 'paramet':214 'part':34 'pay':48 'pay-per-call API' 'pay-per-request':47 'payload':218 'payment':91,105,144,150 'per':11,25,49,111 'per-request':10,24 'platform':38,127,167 'point':193 'post':163 'premium':4,18,68 'price':179,192 'prompt':205 'proof':151 'protocol':46 'rate':133 'represent':122 'request':12,26,50,112 'request/response':212 'requir':110 'resourc':65 'respons':153 'return':86,200 'schema':213 'scheme':106 'sentiment':174 'settl':93 'simpli':139 'span':52 'specif':63 'substant':208 'summar':177 'text':176 'type':155 'unavail':220 'unit':116 'usdc':14,28,99,118 'usdc-payment' 'use':98 'util':61 'valid':88,148 'wallet':204 'web3':58 'x':143 'x-payment':142 'x402':2,16,45,89,149 'x402 premium API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"f275d54e-cc48-4bf4-adb3-8f9f358eb88f","listingId":"448fe5de-b136-4420-8f17-eb462135c4a3","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/carts/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:13.477Z"}],"sources":[{"listingId":"448fe5de-b136-4420-8f17-eb462135c4a3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:13.477Z","lastSeenAt":"2026-04-22T13:30:15.652Z"}],"details":{"listingId":"448fe5de-b136-4420-8f17-eb462135c4a3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/6 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 USDC units on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/6"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/6"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Integrating x402-compatible payment flows into agent workflows","Testing x402 protocol payment challenges against a live endpoint"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, no-signup API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring non-crypto payment methods","High-volume use cases where per-request pricing is cost-prohibitive"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.279Z"},"updatedAt":"2026-04-22T13:30:15.652Z"}}