{"id":"3a242055-55e6-49c4-a115-31351864f312","shortId":"T2QK4M","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/carts/47` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The 402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.\n\nThe broader platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. The platform claims no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nDocumentation beyond the landing page is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The `/api/v1/carts/47` endpoint itself is live (returns a proper 402 challenge), but what it actually returns upon successful payment is unknown — the description simply says \"Premium API Access\" with a JSON mime type.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","post-endpoint","json-response"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","402 payment endpoint","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no content","The specific purpose and response format of /api/v1/carts/47 ('Premium API Access') is undocumented","Cannot verify what data or service is actually delivered upon payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/47","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/47","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 402 challenge, confirming it works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/carts/47 is unclear. The docs, pricing, and README pages are all empty wallet-connect 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'/api/v1/carts/47':65,230 '/docs':194 '/pricing':196 '/readme':198 '/request':17,34,160 '0.02':16,33,103,159 '000':92 '0x8335':97 '20':91 '2913':98 '402':84,238 '402 payment endpoint' '6':109 'Base USDC API' 'accept':73 'access':45,71,174,256 'actual':243 'addit':209 'advertis':114 'ai':10,27,126 'amount':89 'analysi':130 'analyt':120 'api':4,21,41,70,118,167,255 'attach':177 'avail':225 'base':7,24,59,93,100 'base-network' 'behind':51 'beyond':186 'broader':112 'caller':175 'categori':116 'challeng':85,239 'claim':165 'classif':133 'connect':204 'content':211 'convers':150 'crawl':228 'crypto-gated API' 'data':9,26,119,123 'decim':110 'descript':251 'document':185,220 'embed':134 'endpoint':14,31,50,63,153,231 'equal':102 'estim':144 'exact':81 'exampl':224 'exchang':139 'export':124 'extrem':191 'feed':138 'financ':11,28,135 'four':115 'gas':143 'gate':3,20,44 'generat':151 'geocod':148 'given':106 'header':181 'indic':86 'infrastructur':146 'insight':125 'instant':173 'json':259 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'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"11168b92-967d-4bdd-90f9-da322a8442dc","listingId":"3a242055-55e6-49c4-a115-31351864f312","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:17.281Z"}],"sources":[{"listingId":"3a242055-55e6-49c4-a115-31351864f312","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:17.281Z","lastSeenAt":"2026-04-23T13:30:32.312Z"}],"details":{"listingId":"3a242055-55e6-49c4-a115-31351864f312","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/47 \\\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 maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/47"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform claims no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/47"}],"useCases":["Paying per-request for API access without API keys or subscriptions","Programmatic agent access to gated endpoints using x402 micropayments","Exploring x402 protocol integration with USDC on Base"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-call API access","Projects wanting low-friction micropayment-gated endpoints"],"notFor":["Production workloads requiring documented request/response schemas","Users who need detailed API documentation or SDKs","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.364Z"},"updatedAt":"2026-04-23T13:30:32.312Z"}}