{"id":"7e7989b7-4482-4489-bb03-abb3836c5680","shortId":"5m9vCC","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a collection of endpoints spanning data analytics, AI/ML inference, finance/crypto market data, and general utility services. All endpoints are paid per request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/resource/33` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The site advertises a uniform $0.02/request pricing across all its endpoints. Categories of APIs available on the platform include: metrics and reports (analytics), sentiment analysis, text summarization, classification, embeddings (AI/ML), price feeds, exchange rates, token quotes, gas estimates (finance/crypto), and geocoding, validation, conversion, and generation (utilities).\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 spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what request body `/api/resource/33` expects or what response it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["llm","data","finance","utility"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API","no-auth API"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /pricing, /README, /api) render only 'Connect wallet' with no content","The specific function of /api/resource/33 is undocumented — it is unclear what it does or what request body it expects","No response examples or error handling documentation available"],"endpointUrl":"https://lowpaymentfee.com/api/resource/33","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/resource/33","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 clear pricing ($0.02 USDC on Base). However, documentation is effectively nonexistent — no OpenAPI spec, no request/response schemas, no examples. The specific purpose of /api/resource/33 is unknown beyond the generic label 'Premium API Access'. This is essentially a stub 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'/api/resource/33':95,238 '/docs':185 '/pricing':187 '/readme':189 '/request':19,38,139 '0.02':18,37,126,138 '000':115 '0x8335':120 '20':114 '2913':121 '402':227 '6':131 'Base network API' 'USDC API' 'accept':103 'access':101 'across':141 'advertis':135 'ai':12,31 'ai-inference' 'ai/ml':56,163 'analysi':158 'analyt':55,156 'api':5,24,45,82,100,147 'avail':148,215 'base':8,27,75,116,123 'bodi':237 'call':4,23,128 'categori':145 'challeng':108,228 'classif':161 'classification' 'collect':50 'confirm':222 'connect':195 'content':201 'convers':176 'cost':112 'crawl':218 'crypto-paid API' 'crypto-quotes' 'data':11,30,54,60 'data-analytics' 'decim':132 'document':180,210,231 'embed':162 'embeddings' 'enabl':44 'endpoint':16,35,52,66,93,144,220 'equal':125 'estim':171 'exampl':214 'exchang':166 'expect':239 'extrem':182 'feed':165 'financ':13,32 'finance-data' 'finance/crypto':58,172 'gas':170 'general':62 'generat':178 'geocod':174 'geocoding' 'includ':152 'indic':109 'infer':57 'key':83 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'x402-payment'","prices":[{"id":"c84e3377-da8c-416a-8374-c814234b5fb8","listingId":"7e7989b7-4482-4489-bb03-abb3836c5680","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/resource/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:48.797Z"}],"sources":[{"listingId":"7e7989b7-4482-4489-bb03-abb3836c5680","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:48.797Z","lastSeenAt":"2026-04-23T23:02:09.091Z"}],"details":{"listingId":"7e7989b7-4482-4489-bb03-abb3836c5680","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/33 \\\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":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/resource/33"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/resource/33"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting reports with micropayments","Geocoding, validation, and data conversion via utility endpoints"],"bestFor":["Agents or bots that need keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments for occasional API calls","Web3-native applications already operating on the Base network"],"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 access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.888Z"},"updatedAt":"2026-04-23T23:02:09.091Z"}}