{"id":"d30c76a4-7be2-440c-9aee-bd607902bd78","shortId":"sgdytg","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API platform that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/charges/359` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform lists endpoints across four 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 endpoints are uniformly priced at $0.02 per request and settle in USDC on Base.\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 spec, no request/response schema documentation, and no usage examples available from the crawl. The x402 challenge for this specific endpoint is live and well-formed, confirming the endpoint is operational, but without documentation it is unclear what request body this particular charge endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee API","crypto-gated API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'","No OpenAPI or schema definition for any endpoint","The specific purpose and expected request/response format of /api/v1/charges/359 is unknown","The platform lists many endpoints on its homepage but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/359","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/359","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational at $0.02/request in USDC on Base. However, there is no OpenAPI spec, no request/response schema, and all documentation pages render only 'Connect wallet' with no technical content. The specific purpose of /api/v1/charges/359 ('Premium API Access') is undocumented, making integration essentially 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'/api/v1/charges/359':65 '/docs':175 '/pricing':177 '/readme':179 '/request':17,34 '0.02':16,33,84,161 '000':79 '20':78 'Base network API' 'USDC API' 'access':45,70,99 'across':119 'advertis':90 'ai':10,27,129 'ai-inference' 'analysi':133 'analyt':123 'api':4,21,41,69,92 'attach':102 'avail':206 'base':7,24,59,80,169 'base-network' 'behind':51 'bodi':236 'broader':115 'call':87 'caller':100 'categori':121 'challeng':212 'charg':239 'classif':136 'classification' 'confirm':223 'connect':185 'convers':153 'crawl':209 'crypto-gated API' 'data':9,26,122,126 'data-analytics' 'detail':192 'document':170,201,230 'embed':137 'embeddings' 'endpoint':14,31,50,63,118,156,216,225,240 'estim':147 'exampl':205 'exchang':142 'expect':241 'export':127 'extrem':172 'feed':141 'financ':11,28,138 'finance-data' 'form':222 'four':120 'gas':146 'gate':3,20,44 'generat':154 'geocod':151 'geocoding' 'header':107 'infrastructur':149 'insight':128 'instant':98 'key':93 'label':67 'learn':131 'limit':96 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'x402':2,19,39,111,211 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"6c74596a-eced-4064-88de-395543856ef5","listingId":"d30c76a4-7be2-440c-9aee-bd607902bd78","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/359","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:15.711Z"}],"sources":[{"listingId":"d30c76a4-7be2-440c-9aee-bd607902bd78","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/359","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:15.711Z","lastSeenAt":"2026-04-23T08:01:18.565Z"}],"details":{"listingId":"d30c76a4-7be2-440c-9aee-bd607902bd78","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Attach a valid X-PAYMENT header (x402 protocol) to pay $0.02 in USDC on Base.\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/359 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/359"},{"claim":"All 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 across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto gas estimates via micropayments","Running geocoding or data validation utilities on a pay-per-call basis","Exporting analytics data or generating insights with no subscription commitment"],"bestFor":["Developers who want zero-commitment, pay-per-use API access","Agents and bots that can settle x402 payments in USDC on Base","Projects needing lightweight access to multiple utility endpoints without managing API keys"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.107Z"},"updatedAt":"2026-04-23T08:01:18.565Z"}}