{"id":"3bd43cd8-734d-4071-af7e-754699b0fd07","shortId":"9MMQ5z","kind":"x402","title":"Pay-per-request API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/call.","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, paid in USDC on the Base network.\n\nThe specific endpoint listed here — `/api/v1/carts/42` — is described as \"Premium API Access\" and returns a live 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The x402 protocol means no API keys or accounts are needed; callers attach an `X-PAYMENT` header with a signed payment to access the resource. The platform advertises no rate limits, no minimums, and instant access.\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 schema, no request/response examples, and no detailed description of what the `/api/v1/carts/42` endpoint actually returns. The landing page lists many endpoints but provides no technical detail beyond names and prices. The endpoint path (`carts/42`) suggests a shopping-cart or e-commerce resource, but this is not confirmed anywhere in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API","crypto API access"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or schema describing request/response formats","The endpoint path /api/v1/carts/42 is not explained anywhere in the crawled content","No request or response examples available","The broad catalog of endpoints listed on the homepage cannot be verified for functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/42","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/42","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 ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no content. The specific endpoint path (carts/42) is unexplained. Effectively a stub 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'land':219 'learn':70 'limit':171 'list':112,221 'live':124 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'mani':222 'materi':256 'mean':143 'metric':63 'micropayment API' 'minimum':173 'name':230 'need':150 'network':108 'no-api-key' 'offer':48 'openapi':202 'page':187,220 'paid':102 'path':235 'pay':2,21,54 'pay per call API' 'pay-per-request':1,20,53 'payment':156,161 'per':3,22,55,100 'platform':6,25,46,167 'premium':118 'price':79,97,184,232 'prompt':194 'protocol':142 'provid':225 'quot':84 'rate':82,170 'readm':186 'render':189 'report':64 'request':4,23,56,101,127 'request/response':205 'resourc':165,246 'return':122,217 'schema':203 'sentiment':71 'sentiment-analysis' 'shop':240 'shopping-cart':239 'sign':160 'spars':180 'specif':110 'substant':197 'suggest':237 'summar':74 'technic':227 'text':73 'text-summarization' 'token':83 'unit':133 'usdc':104,135 'usdc-base' 'util':15,34,89 'valid':91 'via':9,28 'wallet':193 'web3':78 'x':155 'x-payment':154 'x402':10,29,43,141 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"703a3ec2-70fe-4478-b57d-6116177105ae","listingId":"3bd43cd8-734d-4071-af7e-754699b0fd07","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:29.489Z"}],"sources":[{"listingId":"3bd43cd8-734d-4071-af7e-754699b0fd07","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:29.489Z","lastSeenAt":"2026-04-23T17:31:08.944Z"}],"details":{"listingId":"3bd43cd8-734d-4071-af7e-754699b0fd07","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/42 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge for /api/v1/carts/42 requests up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/42"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time finance data (prices, exchange rates, gas estimates) with per-call USDC micropayments","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis","Integrating agent-driven workflows that pay for API calls autonomously via x402"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can autonomously pay for API calls on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.634Z"},"updatedAt":"2026-04-23T17:31:08.944Z"}}