{"id":"62a3af42-5e87-4db6-931f-2cf5e7dca00b","shortId":"xnjFDN","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 advertises 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 probed (/api/v1/apikeys/76) returned a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…0913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests 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 example payloads available. The exact functionality behind the \"Premium API Access\" label at this particular path (/api/v1/apikeys/76) is unclear; it may relate to API key generation or management, but this is speculative. Prospective users should be aware that without documented input/output schemas, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","json-api","no-api-key-required","no-rate-limits"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","premium API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The exact functionality of /api/v1/apikeys/76 ('Premium API Access') is unclear — may be an API key provisioning endpoint but this is unconfirmed","The site lists many API categories (AI, finance, analytics, utilities) but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/76","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/76","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 ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/apikeys/76 is undocumented. This is effectively a stub 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'/api/v1/apikeys/76':117,214 '/docs':170 '/pricing':171 '/readme':174 '0.02':9,22,92,138 '000':127 '0913':133 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':132 '20':126 '300':154 '6':136 'Base network API' 'USDC API access' 'accept':159 'access':3,16,34,208 'address':150 'advertis':43 'ai':61 'analysi':65 'analyt':55 'api':2,15,33,52,104,207,221 'application/json':164 'avail':200 'awar':234 'base':8,21,100,128,135 'behind':204 'broad':45 'call':51,140 'catalog':46 'challeng':122 'classif':68 'commit':111 'connect':180 'contact':244 'content':186 'convers':85 'data':54,58 'decim':137 'document':165,195,237 'embed':69 'endpoint':28,88,115,158 'estim':79 'exact':147,202 'exampl':198 'exchang':74 'experiment':242 'export':59 'extrem':167 'feed':73 'financ':70 'function':203 'gas':78 'gate':35 'generat':86,223 'geocod':83 'infrastructur':81 'input/output':238 'insight':60 'integr':240 'json-api' 'key':105,222 'label':209 'learn':63 'limit':108 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':62 'made':143 'manag':225 'may':218 'metric':56 'micropay':6,19 'micropayment' 'micropayment API' 'network':101 'no-api-key-required' 'no-rate-limits' 'openapi':190 'page':175 'particular':212 'path':213 'pay':49 'pay-per-cal':48 'pay-per-call API' 'pay-per-request' 'payload':199 'payment':39,141 'per':10,23,50,93,139 'post':160 'premium':1,14,32,206 'premium API' 'price':72,90 'probe':116 'prompt':182 'prospect':230 'protocol':40 'provid':31,246 'quot':77 'rate':75,107 'relat':219 'render':177 'report':57 'request':11,24,94,123,161 'request/response':193 'requir':112,241 'return':118,163 'schema':194,239 'scheme':148 'second':155 'sentiment':64 'settl':95 'site':42 'span':53 'spars':168 'spec':191 'specif':114 'specul':229 'summar':67 'text':66 'timeout':156 'token':76 'unclear':216 'unit':129 'usdc':13,26,97,131 'usdc-base' 'user':231 'util':82 'valid':84,120 'via':4,17,144 'wallet':181 'web3':71 'without':236 'x402':5,18,38,121,146 'x402 API' 'x402-payment'","prices":[{"id":"f67a2e1c-4a64-4f3b-a997-ef76826d96eb","listingId":"62a3af42-5e87-4db6-931f-2cf5e7dca00b","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/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:44.571Z"}],"sources":[{"listingId":"62a3af42-5e87-4db6-931f-2cf5e7dca00b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:44.571Z","lastSeenAt":"2026-04-22T10:02:37.894Z"}],"details":{"listingId":"62a3af42-5e87-4db6-931f-2cf5e7dca00b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/76 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/76"},{"claim":"Site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/76"}],"useCases":["Accessing pay-per-call API endpoints without subscription or API key management","Making micropayment-gated requests for data, AI, finance, or utility services","Integrating x402-compatible agents with on-chain USDC payments on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing at $0.02 may add up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.496Z"},"updatedAt":"2026-04-22T10:02:37.894Z"}}