{"id":"8cded274-6af5-4035-ba9c-3550f196677f","shortId":"AZbr7f","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 broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/charges/334` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, no subscriptions, and no rate limits. Callers attach an X-PAYMENT header with a valid payment proof and receive a JSON response.\n\nThe wider platform advertises four endpoint categories: 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 listed endpoints share the same $0.02/request pricing.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 proper 402 challenge), but without documentation it is unclear what request body `/api/v1/charges/334` expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","no-key API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The purpose and expected input/output of /api/v1/charges/334 specifically is unknown","The broad catalog of endpoints (AI, finance, data, utils) is listed but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/334","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/charges/334","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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response documentation, no examples, and all doc pages render only 'Connect wallet'. The specific purpose of /api/v1/charges/334 ('Premium API Access') is undifferentiated from the other endpoints and 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'/api/v1/charges/334':69,230 '/docs':177 '/pricing':178 '/readme':181 '/request':19,38,170 '0.02':18,37,78,169 '000':82 '20':81 '402':219 '6':88 'Base network API' 'USDC micropayment API' 'access':75 'advertis':126 'ai':12,31,137 'ai-inference' 'analysi':141 'analyt':131 'api':5,24,45,74,98 'attach':107 'avail':207 'base':8,27,63,83 'base-network' 'bodi':229 'broad':50 'call':4,23,80 'caller':106 'catalog':51 'categori':129 'challeng':220 'classif':144 'confirm':214 'connect':187 'content':193 'convers':161 'cost':77 'crawl':210 'crypto-paid API' 'data':11,30,130,134 'data-analytics' 'decim':89 'document':172,202,223 'embed':145 'enabl':44 'endpoint':16,35,57,67,128,165,212 'estim':155 'exampl':206 'exchang':150 'expect':231 'export':135 'extrem':174 'feed':149 'financ':13,32,146 'finance-data' 'four':127 'gas':154 'generat':162 'geocod':159 'handl':92 'header':112 'infrastructur':157 'insight':136 'json':121 'json-api' 'key':99 'learn':139 'limit':105 'list':71,164 'live':215 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'x402-payment'","prices":[{"id":"69099108-1931-4b31-85ea-b516ebfbcdbb","listingId":"8cded274-6af5-4035-ba9c-3550f196677f","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/charges/334","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:06.037Z"}],"sources":[{"listingId":"8cded274-6af5-4035-ba9c-3550f196677f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/334","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:06.037Z","lastSeenAt":"2026-04-23T08:01:18.148Z"}],"details":{"listingId":"8cded274-6af5-4035-ba9c-3550f196677f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/334 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/334"},{"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 platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/334"}],"useCases":["Agents needing on-demand API access without managing API keys or subscriptions","Programmatic access to AI inference (sentiment, summarization, classification, embeddings) with per-call billing","Fetching real-time financial data (prices, exchange rates, gas estimates) via micropayments","Utility operations like geocoding, validation, and data conversion paid per request"],"bestFor":["AI agents that need keyless, pay-as-you-go API access on Base","Developers prototyping with low-cost per-call endpoints without signup","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where per-call pricing adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.581Z"},"updatedAt":"2026-04-23T08:01:18.148Z"}}