{"id":"d19c5320-339e-4b52-8477-9bea01f6f66f","shortId":"ysMKhp","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated by the x402 payment protocol. The site offers a broad catalog of pay-per-call APIs spanning 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 priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/apikeys/46` is listed as \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 exact scheme, with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\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 crawled material. The actual functionality behind this particular endpoint path (`/apikeys/46`) is unclear; it may provision or retrieve an API key, but this is speculative. Prospective users should test the endpoint directly to understand its behavior.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","http-post","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found; request and response formats are unknown.","The specific purpose of /api/v1/apikeys/46 ('Premium API Access') is ambiguous — it is unclear what data or service it provides.","The broader site lists many endpoints but none have documented input/output schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/46","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/apikeys/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of this specific endpoint (/apikeys/46) is unclear. Effectively a stub 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'/api/v1/apikeys/46':116 '/apikeys/46':216 '/docs':173 '/pricing':174 '/readme':177 '0.02':9,22,92,144 '000':133 '0x8335':138 '20':132 '2913':139 '300':157 '6':142 'Base network API' 'USDC micropayment API' 'accept':162 'access':3,16,34,122 'actual':209 'ai':61 'analysi':65 'analyt':55 'api':2,15,33,52,104,121,225 'application/json':167 'avail':203 'base':8,21,100,134,141 'behavior':241 'behind':211 'broad':45 'call':51,146 'catalog':46 'challeng':128 'classif':68 'commit':111 'connect':183 'content':189 'convers':85 'crawl':206 'crypto-paid API' 'data':54,58 'decim':143 'direct':237 'document':168,198 'embed':69 'endpoint':28,88,115,161,214,236 'estim':79 'exact':153 'exampl':202 'exchang':74 'export':59 'extrem':170 'feed':73 'financ':70 'function':210 'gas':78 'gate':35 'generat':86 'geocod':83 'http':163 'http-post' 'infrastructur':81 'insight':60 'json-response' 'key':105,226 'learn':63 'limit':108 'list':118 'live':126 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':62 'made':149 'materi':207 'may':220 'metric':56 'micropay':6,19 'micropayment' 'network':101 'offer':43 'openapi':193 'page':178 'particular':213 'path':215 'pay':49 'pay-per-cal':48 'pay-per-call API' 'pay-per-request' 'payment':39,147 'per':10,23,50,93,145 'post':164 'premium':1,14,32,120 'premium API access' 'price':72,90 'prompt':185 'prospect':231 'protocol':40 'provid':31 'provis':221 'quot':77 'rate':75,107 'render':180 'report':57 'request':11,24,94,129 'request/response':196 'requir':112 'retriev':223 'return':124,166 'schema':197 'scheme':154 'second':158 'sentiment':64 'settl':95 'site':42 'span':53 'spars':171 'spec':194 'specif':114 'specul':230 'summar':67 'test':234 'text':66 'timeout':159 'token':76 'unclear':218 'understand':239 'unit':135 'usag':201 'usdc':13,26,97,137 'usdc-base' 'user':232 'util':82 'valid':84 'via':4,17,150 'wallet':184 'web3':71 'x402':5,18,38,127,152 'x402 API' 'x402-payment'","prices":[{"id":"fce362b8-9d69-4a07-aedd-ad4a999761a7","listingId":"d19c5320-339e-4b52-8477-9bea01f6f66f","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/apikeys/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:26.507Z"}],"sources":[{"listingId":"d19c5320-339e-4b52-8477-9bea01f6f66f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:26.507Z","lastSeenAt":"2026-04-22T09:01:53.911Z"}],"details":{"listingId":"d19c5320-339e-4b52-8477-9bea01f6f66f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/46 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/46"},{"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 site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/apikeys/46"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off API calls paid per-request in USDC on Base","Agent-driven programmatic access to gated services via x402 protocol"],"bestFor":["Developers who want instant API access without signup or subscriptions","AI agents that can settle x402 payments autonomously on Base","Users who prefer pay-per-use pricing with no rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.298Z"},"updatedAt":"2026-04-22T09:01:53.911Z"}}