{"id":"68f87b56-1d2a-4e6a-99c6-fd5eebbeea3b","shortId":"XNwJzZ","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/196` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It is one of many endpoints on the platform, all priced uniformly at $0.02 per request.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals equals $0.02 USD per call. The endpoint accepts HTTP POST requests and returns application/json. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe platform's landing page lists sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation. However, documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. As a result, there is no schema documentation, no example request/response payloads, and no detailed description of what resource/196 specifically returns. Callers should treat this as a minimally documented endpoint until the provider publishes proper API docs.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["infrastructure","api-gateway"],"synonyms":["premium API","x402 API","pay-per-call API","lowpaymentfee","USDC micropayment API","Base network API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only 'Connect wallet' with no content","The exact functionality of resource/196 ('Premium API Access') is completely undocumented","No request body schema or response schema provided","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/196","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/generate/resource/196","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this specific resource does, no request/response schemas, and all doc pages return only 'Connect wallet'. This is effectively a stub 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'/api/v1/generate/resource/196':71 '/docs':196 '/pricing':198 '/readme':199 '/request':17,34 '0.02':16,33,101,134 '000':126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':118 '20':125 '6':131 'Base network API' 'USDC micropayment API' 'accept':140 'access':77 'advertis':121,154 'ai':59 'analysi':179 'analyt':58 'api':5,22,55,76,148,246 'application/json':146 'attach':157 'base':8,25,113,127 'beyond':85 'call':12,29,137 'caller':155,232 'challeng':120 'classif':182 'collect':46 'connect':204 'content':210 'contract':117 'convers':190 'data':57 'decim':132 'descript':226 'detail':225 'doc':247 'document':84,194,218,239 'embed':183 'endpoint':6,23,36,93,139,176,240 'equal':133 'exact':80 'exampl':220 'exchang':186 'feed':185 'financ':62 'function':81 'gate':3,20 'generat':192 'geocod':188 'handl':106 'header':162 'howev':193 'http':141 'http-post' 'infrastructur':65 'json-response' 'key':149 'label':87 'land':172 'learn':61 'limit':152 'list':73,174 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':60 'mani':92 'maxamountrequir':123 'minim':238 'network':114 'offer':44 'one':90 'page':173,195 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payload':222 'payment':104,161,167 'per':11,28,53,102,136 'platform':42,96,170 'post':142 'premium':4,21,75 'premium API' 'price':98,184 'prompt':206 'proof':168 'proper':245 'protocol':50,110 'provid':243 'publish':244 'rate':151,187 'request':54,103,143 'request/response':221 'resourc':69 'resource/196':229 'result':213 'return':145,201,231 'schema':217 'sentiment':178 'sibl':175 'simpli':156 'span':56 'specif':68,230 'substant':209 'summar':181 'text':180 'treat':234 'uniform':99 'unit':128 'usd':135 'usdc':14,31,116 'usdc-base' 'use':115 'util':66 'valid':165,189 'via':107 'wallet':205 'web3':63 'x':160 'x-payment':159 'x402':2,19,49,109,166 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"1184b572-2981-4942-a676-a9e7d34522a7","listingId":"68f87b56-1d2a-4e6a-99c6-fd5eebbeea3b","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/generate/resource/196","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:40.291Z"}],"sources":[{"listingId":"68f87b56-1d2a-4e6a-99c6-fd5eebbeea3b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/196","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:40.291Z","lastSeenAt":"2026-04-24T12:02:53.781Z"}],"details":{"listingId":"68f87b56-1d2a-4e6a-99c6-fd5eebbeea3b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/196 \\\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 with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/196"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/196"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need instant, keyless API access settled in USDC on Base","Low-volume, pay-per-use API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-throughput production workloads requiring well-documented schemas and error handling","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.119Z"},"updatedAt":"2026-04-24T12:02:53.781Z"}}