{"id":"5ab73668-a662-42cb-95c2-9176e533657a","shortId":"D7S4rw","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 variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/charges/199` 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 translates to $0.02 per request, consistent with the site's advertised flat pricing. Payment is made via the x402 exact scheme, settling to the specified payTo address 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/request price point. However, documentation beyond the landing page 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 spec, no request/response schema documentation, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages return only 'Connect wallet' with no content","The specific purpose of /api/v1/charges/199 ('Premium API Access') is not documented; it is unclear what data or service it returns","No request body schema or response schema is provided anywhere in the crawled material","The platform lists many endpoints on its landing page but none have documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/199","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/199","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 landing page, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/charges/199 is unclear — it could be a generic charge endpoint or a specific service. Effectively a stub 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'/api/v1/charges/199':83 '/docs':190 '/pricing':192 '/readme':194 '/request':13,28,177 '0.02':12,27,116,176 '000':99 '0x8335':104 '20':98 '2913':105 '300':143 '402':93 '6':111 'Base network API' 'USDC micropayment API' 'access':89 'across':45 'address':140 'advertis':124,149 'ai-inference' 'ai/ml':48 'analysi':153 'analyt':47 'api':5,20,37,69,88 'avail':221 'base':8,23,65,100,107 'beyond':182 'broader':147 'call':4,19 'challeng':94 'classif':156 'classification' 'commit':77 'connect':200 'consist':119 'convers':168 'crawl':224 'crypto-quotes' 'data':46,170 'data-analytics' 'decim':112 'detail':207 'document':181,216 'embed':157 'embeddings' 'enabl':36 'endpoint':44,55,81,150 'estim':165 'exact':133 'exampl':220 'exchang':160 'extrem':187 'feed':159 'finance-data' 'finance/web3':50 'flat':125 'gas':164 'generat':171 'geocod':166 'geocoding' 'howev':180 'infer':49 'infrastructur':52 'key':70 'land':184 'limit':73 'list':85 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 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'x402-payment'","prices":[{"id":"38580663-a7a1-46a3-bd07-4358d771d6f9","listingId":"5ab73668-a662-42cb-95c2-9176e533657a","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/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:32.095Z"}],"sources":[{"listingId":"5ab73668-a662-42cb-95c2-9176e533657a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:32.095Z","lastSeenAt":"2026-04-22T16:31:13.784Z"}],"details":{"listingId":"5ab73668-a662-42cb-95c2-9176e533657a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/199 \\\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":"All endpoints are 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":"The x402 challenge for /api/v1/charges/199 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/199"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with micropayments","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["Agents needing keyless, pay-per-call access to diverse utility APIs","Developers who want to avoid subscription commitments for low-volume API usage","x402-compatible clients on the Base network looking for cheap micropayment endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Users without USDC on Base network or x402-compatible payment infrastructure"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.112Z"},"updatedAt":"2026-04-22T16:31:13.784Z"}}