{"id":"c8576418-a030-44c4-bdaf-87da4206430c","shortId":"GjKEh9","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","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/cards/1` is described as \"Premium API Access\" and accepts payment in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. Payment is made via the x402 exact scheme with no API keys, subscriptions, 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 technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/cards/1` endpoint specifically returns. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual functionality behind this particular path is unclear from available materials.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","pay-per-call","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding"],"categories":["api-gateway","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","micropayment API","Base USDC API","lowpaymentfee","low payment fee","crypto API gateway","402 payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages all return only a 'Connect wallet' prompt with no usable content","The specific purpose and response format of /api/v1/cards/1 ('Premium API Access') is completely undocumented","Cannot verify that the advertised AI, analytics, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/1","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/cards/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing endpoint names. The specific functionality of /api/v1/cards/1 is undocumented. This is effectively a stub 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'/api/v1/cards/1':57,198 '/docs':166 '/pricing':168 '/readme':170 '/request':16,32,158 '0.02':15,31,90,157 '000':81 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':70 '20':80 '402':210 '402 payment API' '6':86 'Base USDC API' 'accept':65 'access':63 'actual':215 'advertis':112 'ai':9,25,124 'ai-inference' 'amount':75 'analysi':128 'analyt':8,24,118 'api':4,20,42,62,102 'avail':224 'base':7,23,51,72,82 'behind':217 'broader':110 'call':41,78 'categori':114 'challeng':212 'classif':131 'collect':36 'confirm':205 'connect':176 'contract':69 'convers':148 'crypto API gateway' 'data':117,121 'data-analytics' 'decim':87 'describ':59 'descript':194 'detail':183 'document':161 'embed':132 'embeddings' 'endpoint':13,29,43,55,116,151,199,203 'equal':89 'estim':142 'exact':98 'exampl':191 'exchang':137 'export':122 'extrem':163 'feed':136 'financ':10,26,133 'finance-data' 'four':113 'function':216 'gas':141 'gate':3,19,44 'generat':149 'geocod':146 'geocoding' 'infrastructur':144 'insight':123 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'x402-payment'","prices":[{"id":"155255e3-2d3d-418e-9cf7-4a54cabb9c83","listingId":"c8576418-a030-44c4-bdaf-87da4206430c","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/cards/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:15.906Z"}],"sources":[{"listingId":"c8576418-a030-44c4-bdaf-87da4206430c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:15.906Z","lastSeenAt":"2026-04-23T12:31:04.569Z"}],"details":{"listingId":"c8576418-a030-44c4-bdaf-87da4206430c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/1 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/1"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/1"},{"claim":"All endpoints listed at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing analytics metrics and reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-request basis","Fetching real-time crypto gas estimates and token price quotes","Geocoding and data validation via utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agents that can settle x402 payments in USDC on Base","Use cases requiring low-cost per-call pricing without API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume workloads where subscription pricing would be more economical","Developers who cannot transact on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.854Z"},"updatedAt":"2026-04-23T12:31:04.569Z"}}