{"id":"2598f212-0d9c-4b2e-a91b-d8f6eb3ee89f","shortId":"t7buB3","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint `/api/v1/carts/17` is listed as \"Premium API Access\" and requires a maximum payment of 20,000 base units of USDC (0.02 USD) per call. The 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).\n\nAll endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required. Payments are made via the x402 exact-payment scheme on the Base L2 network, settling in USDC (contract 0x8335…2913). The platform emphasizes low friction: callers attach an X-PAYMENT header to each request and receive the response immediately upon payment verification.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI specification, no request/response schema documentation, and no usage examples available from the crawled content. The exact functionality behind the `/api/v1/carts/17` endpoint is unclear beyond its \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-l2","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","serverless API marketplace"],"warnings":["No OpenAPI specification or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","The specific purpose and expected input/output of /api/v1/carts/17 ('Premium API Access') is undocumented","No request or response examples could be sourced"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/17","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/17","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 spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The actual functionality of /api/v1/carts/17 is opaque. This is effectively a stub 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'/api/v1/carts/17':64,238 '/call':19,38 '/docs':197 '/pricing':199 '/readme':201 '0.02':18,37,83,133 '000':78 '0x8335':167 '20':77 '2913':168 'Base network API' 'USDC API' 'access':70,246 'advertis':90 'ai':12,31,102 'ai-inference' 'analysi':106 'analyt':96 'api':5,24,48,69,94,138,245 'attach':175 'avail':228 'base':8,27,57,79,160 'base-l2' 'behind':236 'beyond':242 'broader':88 'call':86 'caller':174 'categori':92 'classif':109 'classification' 'collect':42 'commit':146 'connect':207 'content':232 'contract':166 'convers':126 'crawl':231 'data':11,30,95,99 'data-analytics' 'detail':214 'document':192,223 'embed':110 'embeddings' 'emphas':171 'endpoint':16,35,49,63,129,239 'estim':120 'exact':155,234 'exact-pay':154 'exampl':227 'exchang':115 'export':100 'extrem':194 'feed':114 'financ':13,32,111 'finance-data' 'four':91 'friction':173 'function':235 'gas':119 'generat':127 'geocod':124 'geocoding' 'header':180 'immedi':188 'infrastructur':122 'insight':101 'key':139 'l2':161 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'x-payment':177 'x402':10,29,53,153 'x402 API' 'x402-payment'","prices":[{"id":"6ac2ffc5-4161-4b2c-bceb-85df2ddceeef","listingId":"2598f212-0d9c-4b2e-a91b-d8f6eb3ee89f","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:46.356Z"}],"sources":[{"listingId":"2598f212-0d9c-4b2e-a91b-d8f6eb3ee89f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:46.356Z","lastSeenAt":"2026-04-23T15:00:45.900Z"}],"details":{"listingId":"2598f212-0d9c-4b2e-a91b-d8f6eb3ee89f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/17 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/17"},{"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 APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/17"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data and crypto gas estimates on a per-request basis","Running geocoding or data validation calls with instant crypto-settled billing","Exporting analytics data or generating insights via pay-as-you-go endpoints"],"bestFor":["Agents or bots that need frictionless, key-free API access settled in crypto","Developers prototyping with multiple utility APIs at very low per-call cost","Web3-native applications that prefer on-chain USDC micropayments over subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that would benefit from bulk pricing or rate-limit guarantees","Teams that require fiat billing or traditional API key authentication"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.77Z"},"updatedAt":"2026-04-23T15:00:45.900Z"}}