{"id":"d6d6d7d2-c2a7-4de4-87a0-9f85855bc007","shortId":"utTCDQ","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is a multi-category API platform that gates all endpoints behind the x402 payment protocol, settling in USDC on the Base network. The specific endpoint `/api/v1/carts/45` is listed as \"Premium API Access\" and requires a payment of up to 20,000 units of USDC (the asset at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals, so this equals $0.02). The endpoint accepts HTTP POST requests and returns application/json.\n\nThe broader 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.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The x402 challenge for `/api/v1/carts/45` is live and well-formed, but the purpose of the \"carts/45\" resource specifically is unclear from available material. It may be a demo or e-commerce cart endpoint, but this is not documented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","json-api"],"categories":["llm","finance","geo","data"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","402 payment required"],"warnings":["Documentation pages (/docs, /pricing, /README, /api) all render only 'Connect wallet' with no usable content","No OpenAPI or JSON schema available for any endpoint","The specific endpoint /api/v1/carts/45 is not listed among the advertised APIs on the homepage — its purpose is unclear","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/45","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/carts/45 is undocumented. The listing is effectively a stub with a working payment 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'/api/v1/carts/45':64,205 '/docs':169 '/pricing':171 '/readme':173 '/request':16,34 '0.02':15,33,94,150 '000':79 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':86 '20':78 '402 payment required' '6':89 'Base network API' 'USDC API' 'accept':97 'access':70 'advertis':107 'ai':9,27,119 'ai-inference' 'analysi':123 'analyt':8,26,113 'api':4,22,43,69,111,155 'application/json':103 'asset':84 'avail':223 'base':7,25,59 'behind':49 'broader':105 'cart':234 'carts/45':217 'categori':42,109 'challeng':203 'classif':126 'classification' 'commerc':233 'commit':163 'connect':179 'content':185 'convers':143 'crypto-quotes' 'data':112,116 'data-analytics' 'decim':90 'demo':229 'detail':196 'document':164,197,240 'e':232 'e-commerc':231 'embed':127 'embeddings' 'endpoint':13,31,48,63,96,146,200,235 'equal':93 'estim':137 'exampl':193 'exchang':132 'export':117 'extrem':166 'feed':131 'financ':10,28,128 'finance-data' 'form':211 'four':108 'gas':136 'gate':3,21,46 'generat':144 'geocod':141 'geocoding' 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'x402-payment'","prices":[{"id":"07b25040-e340-43e5-a3f9-18092a5e2496","listingId":"d6d6d7d2-c2a7-4de4-87a0-9f85855bc007","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:12.295Z"}],"sources":[{"listingId":"d6d6d7d2-c2a7-4de4-87a0-9f85855bc007","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:12.295Z","lastSeenAt":"2026-04-23T23:01:54.867Z"}],"details":{"listingId":"d6d6d7d2-c2a7-4de4-87a0-9f85855bc007","quickStartSnippet":"# Pay $0.02 in USDC on Base to call the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/carts/45 \\\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":"The x402 challenge returns 402 with maxAmountRequired of 20000 units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/45"},{"claim":"All endpoints are 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 platform offers four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/45"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data such as exchange rates, token quotes, and gas estimates on a per-request basis","Running analytics queries and data exports with instant pay-per-use billing","Geocoding and data validation via utility endpoints"],"bestFor":["Agents or developers who want instant, keyless API access via x402 micropayments","Use cases requiring low-friction, per-request billing without subscriptions","Crypto-native workflows already operating on the Base network with USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.349Z"},"updatedAt":"2026-04-23T23:01:54.867Z"}}