{"id":"92935f37-2de7-4b05-aab4-5d5463c2320d","shortId":"S6CYDF","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 offers a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/stripe/charges/28` is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe provider's landing page lists 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 are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 spec, no request/response schema documentation, and no example payloads available. The specific functionality behind the `/api/v1/stripe/charges/28` path is unclear; the name \"Premium API Access\" and the path segment \"stripe/charges\" suggest it may relate to Stripe charge data or a payment-processing wrapper, but this is speculative given the lack of documentation.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-call","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-gateway","finance","llm","geo"],"synonyms":["low payment fee","x402 API","pay-per-request API","USDC API","Base network API","micropayment API","stripe charges API"],"warnings":["No API documentation available; /docs, /pricing, /api, and /README pages all show only a wallet-connect prompt","The specific functionality of /api/v1/stripe/charges/28 is undocumented and unclear from the path alone","No OpenAPI spec or request/response schema is provided","No examples of successful responses are available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/28","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/stripe/charges/28","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, documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and the specific purpose of this endpoint is unclear. The landing page lists many endpoints but provides no technical detail for any of 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'/api/v1/stripe/charges/28':61,203 '/docs':166 '/pricing':168 '/readme':170 '/request':16,34 '0.02':15,33,96,146 '000':86 '0x8335':74 '20':85 '2913':75 '6':91 'Base network API' 'USDC API' 'accept':69 'access':67,211 'advertis':81 'ai':9,27,116 'ai-inference' 'analysi':120 'analyt':8,26,110 'api':4,22,46,66,151,210 'avail':197 'base':7,25,55,77,87 'base-network' 'behind':201 'call':45 'categori':106 'challeng':80 'charg':223 'classif':123 'collect':40 'commit':159 'connect':176 'contract':73 'convers':140 'data':109,113,224 'data-analytics' 'decim':92 'detail':183 'document':161,192,239 'embed':124 'endpoint':13,31,47,59,108 'equal':95 'estim':134 'exampl':195 'exchang':129 'export':114 'extrem':163 'feed':128 'financ':10,28,125 'finance-data' 'four':105 'function':200 'gas':133 'gate':3,21,48 'generat':141 'geocod':138 'given':235 'infrastructur':136 'insight':115 'key':152 'lack':237 'land':102 'learn':118 'limit':155 'list':63,104 'low payment fee' 'lowpaymentfee.com':37 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'x402-payment'","prices":[{"id":"d1680fd7-600a-46d0-bb34-7debe4339de4","listingId":"92935f37-2de7-4b05-aab4-5d5463c2320d","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/stripe/charges/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:24.703Z"}],"sources":[{"listingId":"92935f37-2de7-4b05-aab4-5d5463c2320d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:24.703Z","lastSeenAt":"2026-04-23T00:32:07.695Z"}],"details":{"listingId":"92935f37-2de7-4b05-aab4-5d5463c2320d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/28 \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/28"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing analytics metrics and reports on a per-call basis without subscription","Running AI inference tasks (sentiment, summarization, classification, embeddings) with crypto micropayments","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Using utility services like geocoding, validation, and data conversion"],"bestFor":["Developers who want pay-per-call API access without API key management","Agents and bots that can settle payments via x402 on Base with USDC","Users needing low-cost, commitment-free access to a variety of utility endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-throughput production workloads where undocumented endpoints pose a reliability risk","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.501Z"},"updatedAt":"2026-04-23T00:32:07.695Z"}}