{"id":"5a93bfbb-000f-4493-9d60-03b2cef07a54","shortId":"ecETHf","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, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/52` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per request. Payment is handled via an `X-PAYMENT` header with no API keys or rate limits 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/request price point.\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 description of what the `/api/v1/stripe/charges/52` endpoint specifically returns. The endpoint is live (returns a valid x402 402 challenge), but the actual functionality behind this particular path is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","analytics-api","ai-inference","finance-data","utility-services"],"categories":["api-gateway","finance","llm","geo"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","low fee API","crypto-gated API","Base network API","402 payment API"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats are unknown","The specific endpoint path '/api/v1/stripe/charges/52' has no description beyond 'Premium API Access'; its actual functionality is unclear","The endpoint path includes 'stripe/charges' which may imply Stripe integration, but the x402 challenge settles in USDC on Base — the relationship is unexplained"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/52","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but 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 the `/api/v1/stripe/charges/52` path is unexplained. The listing is effectively a 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'no-api-key' 'offer':38 'openapi':181 'page':166 'particular':212 'path':213 'pay':43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payment':54,87,94 'per':44,85 'platform':106 'point':155 'premium':69 'price':130,154,163 'prompt':173 'protocol':52 'quot':135 'rate':101,133 'readm':165 'render':168 'report':115 'request':86 'request/response':184 'requir':73,103 'return':195,200 'schema':182 'sentiment':122 'settl':53 'spars':159 'specif':62,194 'suit':5,23 'summar':125 'text':124 'token':134 'unclear':215 'unit':80 'usdc':18,36,56,82 'usdc-settlement' 'util':12,30,140 'utility-services' 'valid':142,202 'via':17,35,90 'wallet':172 'web3':129 'x':93 'x-payment':92 'x402':2,20,51,203 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"079d2936-e41b-4ca7-9e09-94b7f0934c33","listingId":"5a93bfbb-000f-4493-9d60-03b2cef07a54","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:29.444Z"}],"sources":[{"listingId":"5a93bfbb-000f-4493-9d60-03b2cef07a54","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:29.444Z","lastSeenAt":"2026-04-23T00:32:07.884Z"}],"details":{"listingId":"5a93bfbb-000f-4493-9d60-03b2cef07a54","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/52 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/52"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/52"}],"useCases":["Accessing analytics metrics and reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto prices, exchange rates, and gas estimates","Performing utility operations like geocoding and data validation"],"bestFor":["Developers wanting pay-per-use API access without API key management","Agents or bots that can settle USDC payments on Base automatically","Low-volume or sporadic API consumers who don't want monthly subscriptions"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot transact in USDC on the Base network","Anyone requiring detailed API schemas and response documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.323Z"},"updatedAt":"2026-04-23T00:32:07.884Z"}}