{"id":"ad9ce2d7-aa88-4f7e-8b7c-88be9cf4f56e","shortId":"dGjgqf","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 micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/carts/38` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of endpoints: 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 listed at the same $0.02 per request price point. The x402 challenge was successfully captured with a 402 response, confirming the endpoint is live.\n\nNote that the specific endpoint `/api/v1/carts/38` does not clearly map to any of the documented API categories on the landing page, and no OpenAPI schema, detailed documentation, or example request/response payloads are available. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The actual functionality behind this particular cart endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","finance","geo","data"],"synonyms":["micropayment API","pay-per-call API","x402 API","USDC API","Base network API","low fee API","crypto-gated API"],"warnings":["The endpoint path /api/v1/carts/38 does not match any of the documented API endpoints on the landing page — its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is available.","Documentation pages (/docs, /pricing, /api, /README) all render only a 'Connect wallet' prompt with no usable content.","The platform's actual data sources and AI model details are undisclosed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/38","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/38","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the specific /api/v1/carts/38 path doesn't correspond to any documented endpoint. The docs/pricing/API pages are empty beyond a wallet connect 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'/request':17,34 '0.02':16,33,78,156 '000':82 '20':81 '402':169 '6':88 'Base network API' 'USDC API' 'access':45,73 'actual':227 'advertis':111 'ai':10,27,123 'ai-inference' 'analysi':127 'analyt':117 'api':4,21,41,72,99,191,213 'avail':208 'base':7,24,61,83 'behind':51,229 'broader':109 'call':80 'captur':166 'cart':232 'categori':113,192 'challeng':163 'classif':130 'classification' 'clear':184 'confirm':171 'connect':219 'content':225 'convers':147 'cost':75 'crypto-gated API' 'data':9,26,116,120 'data-analytics' 'decim':89 'detail':201 'doc':210 'document':190,202 'embed':131 'embeddings' 'endpoint':14,31,50,65,115,150,173,180,233 'estim':141 'exact':96 'exampl':204 'exchang':136 'export':121 'feed':135 'financ':11,28,132 'finance-data' 'four':112 'function':228 'gas':140 'gate':3,20,44 'generat':148 'geocod':145 'geocoding' 'handl':92 'infrastructur':143 'insight':122 'key':100 'land':195 'learn':125 'limit':103 'list':69,152 'live':175 'low fee API' 'lowpaymentfee.com':35 'machin':124 'map':185 'marketplac':42 'metric':118 'micropay':55 'micropayment API' 'network':62 'note':176 'offer':8,25 'openapi':199 'page':196,214 'particular':231 'pay-per-call API' 'payload':206 'payment':90 'per':53,79,157 'per-request':52 'per-request-micropayment' 'platform':5,22,110 'point':160 'premium':71 'price':134,159,211 'prompt':221 'protocol':40 'quot':139 'rate':102,137 'render':216 'report':119 'request':54,158 'request/response':205 'requir':107 'respons':170 'schema':200 'scheme':97 'sentiment':126 'sentiment-analysis' 'settl':56 'specif':64,179 'subscript':106 'success':165 'summar':129 'text':128 'text-summarization' 'token':138 'unclear':235 'unit':84 'usdc':58,86 'usdc-base' 'util':13,30,144 'utility-apis' 'valid':146 'varieti':48 'via':93 'wallet':220 'web3':133 'x402':2,19,39,95,162 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"ebf3bcd3-bc7c-4182-8228-7c551f9b0dc2","listingId":"ad9ce2d7-aa88-4f7e-8b7c-88be9cf4f56e","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:54.780Z"}],"sources":[{"listingId":"ad9ce2d7-aa88-4f7e-8b7c-88be9cf4f56e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:54.780Z","lastSeenAt":"2026-04-23T14:30:36.829Z"}],"details":{"listingId":"ad9ce2d7-aa88-4f7e-8b7c-88be9cf4f56e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/38 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/38"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/38"}],"useCases":["Paying per-request for AI inference (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time financial data like token quotes, gas estimates, and exchange rates via micropayment","Running data analytics queries and exporting data on demand","Geocoding and utility operations with no subscription commitment"],"bestFor":["Agents or developers who want keyless, pay-as-you-go API access","Low-volume or bursty workloads where subscriptions are wasteful","Crypto-native applications already on the Base network"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation or OpenAPI specs before integrating","Users without access to USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.554Z"},"updatedAt":"2026-04-23T14:30:36.829Z"}}