{"id":"83ab0f70-7512-44ee-af6e-1c90d0985a37","shortId":"LN3XXX","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/104` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's advertised pricing. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation is extremely sparse: the /docs, /pricing, /api, 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 usage examples available from the crawled content. The actual behavior and response format of this specific transactions endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no technical content","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected input/output of /api/v1/transactions/104 is undocumented","The platform lists many endpoint categories but none have documented request/response formats"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/104","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/transactions/104","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 402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific '/transactions/104' endpoint is entirely unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/api/v1/transactions/104':96 '/docs':192 '/pricing':193 '/readme':196 '/request':13,28 '0.02':12,27,64,128,183 '000':112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '0x8335':117 '20':111 '2913':118 '300':150 '402':106 '6':124 'Base network API' 'USDC micropayment API' 'access':102 'account':76 'actual':229 'address':142 'advertis':136,156 'ai-inference' 'ai/ml':49 'analysi':160 'analyt':48 'api':5,20,37,74,101 'attach':84 'avail':223 'base':8,23,71,113,120 'base-network' 'behavior':230 'broad':42 'broader':154 'call':4,19,130 'caller':82 'challeng':107 'classif':163 'connect':202 'consist':131 'content':227 'convers':175 'crawl':226 'crypto-data' 'crypto-paid API' 'data':47,52,177 'data-analytics' 'decim':125 'detail':209 'document':187,218 'embed':164 'enabl':36 'endpoint':45,57,94,157,238 'equal':127 'estim':172 'exact':146 'exampl':222 'exchang':167 'extrem':189 'feed':166 'finance-data' 'finance/web3':51 'format':233 'gas':171 'generat':178 'geocod':173 'header':88 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'x402-payment'","prices":[{"id":"f5caf5c1-21b4-4c9c-a458-6840a94193ee","listingId":"83ab0f70-7512-44ee-af6e-1c90d0985a37","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/transactions/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:10.057Z"}],"sources":[{"listingId":"83ab0f70-7512-44ee-af6e-1c90d0985a37","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/104","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:10.057Z","lastSeenAt":"2026-04-22T23:02:06.686Z"}],"details":{"listingId":"83ab0f70-7512-44ee-af6e-1c90d0985a37","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/104 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/104"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics and reports without creating an account or managing API keys","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching real-time crypto prices, gas estimates, and exchange rates via micropayments","Geocoding, validation, and data conversion utilities paid per request"],"bestFor":["Developers who want zero-friction API access without subscriptions or API key management","AI agents that can autonomously pay for API calls using x402 on Base","Projects needing low-cost, pay-as-you-go access to diverse utility endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.775Z"},"updatedAt":"2026-04-22T23:02:06.686Z"}}