{"id":"7ae5c4e3-98b1-4504-bcc9-c4aafd548f0e","shortId":"YjQhpx","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/orders/9` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The broader platform advertises a uniform $0.02/request pricing across all its endpoints, covering categories such as sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what request body `/api/v1/orders/9` expects or what response it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","post-endpoint","pay-per-use"],"categories":["api-platform","data","ai"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected input/output of /api/v1/orders/9 is undocumented","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/9","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/orders/9","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 with clear pricing. However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schemas, and no examples. The purpose of the specific /api/v1/orders/9 endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/orders/9':91,219 '/docs':165 '/pricing':167 '/readme':169 '/request':17,34,136 '0.02':16,33,122,135 '000':111 '0x8335':116 '20':110 '2913':117 '402':208 '6':127 'Base network API' 'USDC API' 'accept':99 'access':97 'across':138 'advertis':132 'ai':10,27 'ai/ml':52 'analysi':147 'analyt':51 'api':4,21,41,78,96 'avail':195 'base':7,24,71,112,119 'bodi':218 'broader':130 'categori':143 'challeng':104,209 'classif':150 'collect':46 'confirm':203 'connect':175 'content':181 'cost':108 'cover':142 'crawl':198 'crypto-paid API' 'data':9,26,50,55 'decim':128 'document':160,190,212 'embed':151 'enabl':40 'endpoint':14,31,48,61,89,141,201 'equal':121 'exampl':194 'exchang':154 'expect':220 'extrem':162 'feed':153 'financ':11,28 'finance/web3':54 'general':57 'geocod':156 'indic':105 'infer':53 'key':79 'limit':82 'list':93 'live':204 'lowpaymentfee' 'lowpaymentfee.com':35 'materi':199 'maximum':107 'micropayment API' 'network':72 'no-api-key' 'offer':8,25 'openapi':185 'page':170 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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/orders/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:38.557Z"}],"sources":[{"listingId":"7ae5c4e3-98b1-4504-bcc9-c4aafd548f0e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:38.557Z","lastSeenAt":"2026-04-22T23:00:55.469Z"}],"details":{"listingId":"7ae5c4e3-98b1-4504-bcc9-c4aafd548f0e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/9 \\\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":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoints span data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/9"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/9"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls from an AI agent using x402 on Base","Paying for API access with USDC stablecoin per request"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native micropayments over subscriptions"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.143Z"},"updatedAt":"2026-04-22T23:00:55.469Z"}}