{"id":"2a3f7689-802f-40b4-b0fe-b4846cd6f562","shortId":"4fW4JY","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/endpoint-78` is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live, accepting POST requests with a maximum cost of 20,000 base units of USDC (i.e., $0.02 per request). Payment is settled on-chain to a specified wallet address, with a 300-second timeout window.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories including 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. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, the specific functionality of `/api/endpoint-78` is not documented — it does not correspond to any of the named endpoints listed on the site. The docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint. The actual capabilities behind this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","on-chain-settlement"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The endpoint /api/endpoint-78 does not match any documented endpoint on the site — its actual functionality is unknown.","No OpenAPI schema, request format, or response format is available for any endpoint.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but provides zero technical detail on any of them."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-78","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/endpoint-78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but the specific endpoint /api/endpoint-78 has no documentation, no schema, no examples, and no description beyond the generic title 'Premium API Access'. All doc pages returned only 'Connect wallet' with no content. This is effectively a stub 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'/request':12,30 '0.02':11,29,97,165 '000':91 '20':90 '300':113 'Base network API' 'USDC micropayment endpoint' 'accept':69,82 'access':48,67,179 'actual':241 'address':110 'advertis':121 'ai':133 'analysi':137 'analyt':127 'api':6,16,24,34,46,66,123,172,206 'avail':233 'base':8,26,56,73,92 'behind':243 'broader':118 'call':4,22 'capabl':242 'categori':124 'chain':105 'challeng':76 'classif':140 'collect':40 'confirm':77 'connect':214 'content':220 'convers':157 'correspond':192 'cost':88 'crypto-paid API' 'data':126,130 'detail':231 'doc':204 'document':188,232 'embed':141 'emphas':170 'endpoint':47,60,79,160,198,239,245 'estim':151 'exampl':228 'exchang':146 'export':131 'feed':145 'financ':142 'function':183 'gas':150 'generat':158 'geocod':155 'host':38 'howev':180 'i.e':96 'includ':125 'infrastructur':153 'insight':132 'instant':178 'key':17,35,173 'learn':135 'limit':176 'list':63,199 'live':81 'lowpaymentfee' 'lowpaymentfee.com':37,119 'machin':134 'maximum':87 'metric':128 'multipl':122 'name':197 'network':57 'no-api-key' 'on-chain':103 'on-chain-settlement' 'openapi':224 'page':209 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,100 'per':3,21,44,98,166 'platform':120,169 'post':83 'post-endpoint' 'premium':5,23,65 'premium API access' 'price':144,163,205 'prompt':216 'protocol':53 'quot':149 'rate':147,175 'readm':208 'remain':246 'report':129 'request':45,84,99,167 'request/response':227 'requir':18,36 'return':211 'schema':225 'second':114 'sentiment':136 'settl':102 'site':202 'specif':59,182 'specifi':108 'substant':219 'summar':139 'text':138 'timeout':115 'token':148 'uniform':162 'unit':93 'unknown':247 'usdc':14,32,70,95 'usdc-base' 'util':154 'valid':156 'via':9,27,49 'wallet':109,215 'web3':143 'window':116 'x402':10,28,51,75 'x402 API' 'x402-payment'","prices":[{"id":"bd725de6-2f22-47a7-a981-ab53507e01d4","listingId":"2a3f7689-802f-40b4-b0fe-b4846cd6f562","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/endpoint-78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:57.107Z"}],"sources":[{"listingId":"2a3f7689-802f-40b4-b0fe-b4846cd6f562","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:57.107Z","lastSeenAt":"2026-04-22T23:00:59.767Z"}],"details":{"listingId":"2a3f7689-802f-40b4-b0fe-b4846cd6f562","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-78 \\\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":"The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-78"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-78"},{"claim":"Documentation pages returned only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, on-chain-settled API calls","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents that can settle USDC payments on Base automatically","Users who want keyless API access without subscriptions"],"notFor":["Anyone needing documented request/response schemas before integrating","High-volume use cases where $0.02/call adds up without bulk discounts","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.291Z"},"updatedAt":"2026-04-22T23:00:59.767Z"}}