{"id":"ea394d85-5cbd-439d-a713-dd3d5cf49cff","shortId":"6V94aP","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: 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 priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/carts/33` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 protocol's `exact` scheme with no API keys or rate limits required. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and the endpoint accepts POST requests returning `application/json`.\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 examples of what the `/api/v1/carts/33` endpoint actually returns. The platform advertises no API keys, no rate limits, and instant access, but the actual functionality behind this specific cart endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","micropayment API","pay-per-call API","Base USDC API","lowpaymentfee","low payment fee API","402 payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages contain no usable content — only a 'Connect wallet' prompt","The specific purpose and response format of /api/v1/carts/33 ('Premium API Access') is not documented anywhere","The broader platform lists many endpoints but none have documented request/response schemas","Cannot verify that the advertised AI, finance, and data endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/33","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/carts/33 is undocumented. The docs, pricing, and README pages are all blank beyond a wallet connect 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'/api/v1/carts/33':113,216 '/call':12,31 '/docs':183 '/pricing':185 '/readme':187 '0.02':11,30,99,134 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':165 '20':128 '402':123 '402 payment API' '6':139 'Base USDC API' 'accept':169 'access':119,231 'across':58 'actual':218,234 'addit':198 'address':163 'advertis':222 'ai':15,34,68 'analysi':72 'analyt':62 'api':5,24,45,118,155,224 'application/json':173 'avail':244 'base':8,27,107,130,142 'behind':236 'beyond':175 'broad':50 'cart':239 'catalog':51 'categori':60 'challeng':124 'classif':75 'connect':193 'content':200 'convers':92 'data':14,33,61,65 'decim':140 'document':174,209 'embed':76 'enabl':44 'endpoint':19,38,57,95,111,168,217,240 'estim':86 'exact':151 'exampl':212 'exchang':81 'export':66 'extrem':180 'feed':80 'financ':16,35,77 'four':59 'function':235 'gas':85 'generat':93 'geocod':90 'infrastructur':88 'insight':67 'instant':230 'json-response' 'key':156,225 'land':177 'learn':70 'limit':159,228 'list':115 'low payment 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'x402-payment'","prices":[{"id":"c629d104-1973-46e0-846a-afbe6549f51c","listingId":"ea394d85-5cbd-439d-a713-dd3d5cf49cff","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:59.561Z"}],"sources":[{"listingId":"ea394d85-5cbd-439d-a713-dd3d5cf49cff","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:59.561Z","lastSeenAt":"2026-04-23T13:30:31.555Z"}],"details":{"listingId":"ea394d85-5cbd-439d-a713-dd3d5cf49cff","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/33 \\\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, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/33"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need on-demand API calls settled in crypto","Testing x402 payment protocol integrations with low-cost endpoints"],"bestFor":["Developers experimenting with x402 pay-per-request patterns","AI agents that need keyless, instant API access on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads where per-request crypto settlement adds overhead","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.169Z"},"updatedAt":"2026-04-23T13:30:31.555Z"}}