{"id":"bdfd84cd-d619-4d7a-897a-ce1f217509aa","shortId":"e5DLTJ","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 platform advertises four categories of APIs: 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 with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/carts/79` is labeled \"Premium API Access\" and returns a valid x402 challenge requesting payment in USDC (contract 0x8335…2913) on Base. The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02 — consistent with the site's advertised pricing. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is essentially empty — 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 documentation, and no examples of what the \"Premium API Access\" endpoint actually returns. The endpoint name (\"carts/79\") suggests it may be a shopping-cart or catalog resource, but this is speculative. Without documentation or sample responses, the actual functionality behind this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages are all empty stubs","No OpenAPI or schema describing request parameters or response format","The endpoint path '/api/v1/carts/79' does not match any of the advertised API categories on the landing page, making its actual functionality unclear","No examples of successful (paid) responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/79","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/79","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the 'carts/79' endpoint actually does or returns after payment. The site's docs pages are all empty 'Connect wallet' 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'/api/v1/carts/79':125 '/docs':200 '/pricing':202 '/readme':204 '/request':17,34 '0.02':16,33,106,162 '000':152 '0x8335':142 '20':151 '2913':143 '300':180 '402 payment API' '6':157 'Base network API' 'USDC API' 'accept':185 'access':45,130,234 'actual':236,263 'advertis':63,168 'ai':10,27,75 'amount':148 'analysi':79 'analyt':69 'api':4,21,41,67,111,129,233 'application/json':190 'base':7,24,59,145,153 'base-network' 'behind':51,265 'beyond':192 'cart':249 'carts/79':241 'catalog':251 'categori':65 'challeng':136 'classif':82 'commit':119 'connect':210 'consist':163 'content':216 'contract':141 'convers':99 'data':9,26,68,72 'decim':158 'document':191,225,258 'embed':83 'empti':198 'endpoint':14,31,50,102,123,184,235,239,267 'equal':161 'essenti':197 'estim':93 'exact':176 'exampl':228 'exchang':88 'export':73 'feed':87 'financ':11,28,84 'four':64 'function':264 'gas':92 'gate':3,20,44 'generat':100 'geocod':97 'infrastructur':95 'insight':74 'json-response' 'key':112 'label':127 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'web3':85 'without':257 'x402':2,19,39,135,175 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"1efcc7b8-57b3-47e2-99d9-b814ff936414","listingId":"bdfd84cd-d619-4d7a-897a-ce1f217509aa","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:02.529Z"}],"sources":[{"listingId":"bdfd84cd-d619-4d7a-897a-ce1f217509aa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:02.529Z","lastSeenAt":"2026-04-23T10:30:29.178Z"}],"details":{"listingId":"bdfd84cd-d619-4d7a-897a-ce1f217509aa","quickStartSnippet":"# 1. Send a POST to get the 402 challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/carts/79\n# 2. Parse the x402 challenge from the response\n# 3. Sign a USDC payment on Base for 20000 base units ($0.02)\n# 4. Resend the POST with the X-PAYMENT header containing the signed payment","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/carts/79","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/carts/79"}],"useCases":["Programmatic access to pay-per-call API endpoints without managing API keys or subscriptions","Agent-driven workflows that need on-demand API access settled via crypto micropayments","Exploring x402-protocol integration for building payment-gated services"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can settle USDC micropayments per request","Use cases requiring keyless, commitment-free API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request crypto settlement adds latency","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.196Z"},"updatedAt":"2026-04-23T10:30:29.178Z"}}