{"id":"a4a6525d-e102-410d-a314-ae0dc0095761","shortId":"jg5Vhx","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/carts/22` is listed as \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl. The exact functionality behind the `/api/v1/carts/22` path is unclear — the name \"Premium API Access\" is generic and the carts path suggests it may be a shopping cart or order resource rather than one of the advertised API categories.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","402 payment api"],"warnings":["The exact functionality of /api/v1/carts/22 ('Premium API Access') is unclear — the path suggests a cart/order resource but no schema or docs are available.","All documentation, pricing, and README pages require wallet connection and returned no useful content.","No OpenAPI spec, request schema, or response schema is available.","The platform lists many endpoint categories but none have documented input/output contracts in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/22","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear, but there is no OpenAPI schema, no documentation accessible without wallet connection, no request/response examples, and the specific purpose of /api/v1/carts/22 is ambiguous. The listing is effectively a stub with pricing 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'/call':13,28 '0.02':12,27,64,115,118,173 '000':110 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':127 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':135 '20':109 '402 payment api' 'accept':138 'access':102,211 'account':76 'address':126 'advertis':104,147,233 'ai/ml':49 'analysi':151 'analyt':48 'api':5,20,37,74,101,210,234 'appear':180 'application/json':143 'attach':84 'avail':194 'base':8,23,71,111,129 'base network api' 'base-network' 'behind':201 'broad':42 'broader':145 'call':120 'caller':82 'cart':216,224 'catalog':43 'categori':235 'classif':154 'connect':185 'contract':133 'convers':166 'cost':107 'crawl':197 'data':47,52 'detail':189 'document':176 'embed':155 'enabl':36 'endpoint':45,57,94,137,148 'estim':163 'exact':199 'exchang':158 'exist':178 'feed':157 'finance/web3':51 'function':200 'gas':162 'generat':168 'generic':213 'geocod':164 'header':88 'i.e':117 'infer':50 'json-response' 'key':75 'limit':79 'list':98 'low payment fee' 'lowpaymentfee.com':31 'made':124 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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/carts/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:40.518Z"}],"sources":[{"listingId":"a4a6525d-e102-410d-a314-ae0dc0095761","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:40.518Z","lastSeenAt":"2026-04-24T21:31:38.604Z"}],"details":{"listingId":"a4a6525d-e102-410d-a314-ae0dc0095761","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/22 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USDC) on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/22"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/22"},{"claim":"Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to utility or data APIs without account signup","Agent-driven API consumption with per-call USDC micropayments","Testing x402 payment flows on Base network"],"bestFor":["Developers wanting zero-friction API access without API keys","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go pricing with no commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.097Z"},"updatedAt":"2026-04-24T21:31:38.604Z"}}