{"id":"0bc55f27-2d2c-4555-a466-6c5933b6147a","shortId":"D42sg4","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/stripe/charges/151` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) using the x402 \"exact\" scheme, with a maximum amount of 20,000 base units — equivalent to $0.02 USD (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nThe broader platform advertises four categories of endpoints: 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 are listed at the same $0.02/request price point. However, the specific endpoint being listed here (`/api/v1/stripe/charges/151`) does not clearly map to any of these advertised categories — its path suggests a Stripe charges resource, and its description is simply \"Premium API Access\" with no further documentation on what it returns.\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 spec, no request/response schema, and no examples available. The endpoint is confirmed live (402 challenge captured), but the actual functionality behind this specific route is unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","The specific endpoint path /api/v1/stripe/charges/151 does not match any of the advertised API categories; its actual functionality is unknown","No request or response schema is provided; callers cannot know what to send or what to expect back","No OpenAPI specification or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/151","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/stripe/charges/151","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what this specific endpoint actually does. The path '/api/v1/stripe/charges/151' with description 'Premium API Access' is opaque. Docs pages are empty beyond a wallet connect 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'/api/v1/stripe/charges/151':65,183 '/docs':222 '/pricing':224 '/readme':226 '/request':17,34,173 '0.02':16,33,102,172 '000':97 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':85 '20':96 '402':256 '6':106 'Base network API' 'USDC API access' 'accept':73 'access':45,71,116,208 'actual':261 'advertis':115,128,192 'ai':10,27,140 'amount':94 'analysi':144 'analyt':134 'api':4,21,41,70,109,207 'avail':250 'base':7,24,59,98 'base-network' 'behind':51,263 'broader':126 'captur':258 'categori':130,193 'chain':81 'challeng':257 'charg':199 'classif':147 'clear':186 'confirm':254 'connect':232 'content':238 'contract':84 'convers':164 'data':9,26,133,137 'decim':107 'descript':203 'document':212,217 'embed':148 'endpoint':14,31,50,63,132,179,252 'equival':100 'estim':158 'exact':89 'exampl':249 'exchang':153 'export':138 'extrem':219 'feed':152 'financ':11,28,149 'four':129 'function':262 'gas':157 'gate':3,20,44 'generat':165 'geocod':162 'grant':118 'header':124 'howev':176 'infrastructur':160 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'web3':150 'x402':2,19,39,88,122 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"dd68cbce-30bc-42c4-8466-1188ad40ae7b","listingId":"0bc55f27-2d2c-4555-a466-6c5933b6147a","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/stripe/charges/151","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:13.085Z"}],"sources":[{"listingId":"0bc55f27-2d2c-4555-a466-6c5933b6147a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/151","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:13.085Z","lastSeenAt":"2026-04-22T18:32:07.556Z"}],"details":{"listingId":"0bc55f27-2d2c-4555-a466-6c5933b6147a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/151 \\\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 x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/151"},{"claim":"All listed APIs are priced at $0.02/request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/151"},{"claim":"The platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without managing API keys or subscriptions","Agent-driven API consumption with on-chain USDC micropayments on Base","Accessing gated premium content or services via x402 protocol"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","x402-compatible clients on the Base network","Low-commitment API usage with no minimums or rate limits"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.12Z"},"updatedAt":"2026-04-22T18:32:07.556Z"}}