{"id":"9c2caa17-6c85-4a5b-bac8-87fd0dd23dbf","shortId":"VQzjQb","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/ML inference, finance/Web3 data, and infrastructure utilities. The specific resource at `/api/v1/lab/results/61` is listed under the title \"Premium API Access\" but its exact functionality is not documented beyond that label — it does not appear in the site's publicly listed API catalog, which focuses on analytics, AI, finance, and utility endpoints.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per request is 20,000 base units of USDC, which at 6 decimals equals $0.02 USD. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is granted purely through per-call USDC micropayments.\n\nBecause this specific path (`/lab/results/61`) is not among the documented endpoints on the site's landing page, its response schema and intended use case are unclear. The platform as a whole advertises categories like metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more — all at the same $0.02 price point. Without further documentation or an OpenAPI spec, the exact data returned by this particular endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","json-response","no-api-key"],"categories":["data","api-gateway"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC micropayment API","pay-per-call API","Base network API","premium data endpoint"],"warnings":["The path /api/v1/lab/results/61 is not listed among the site's documented endpoints — its purpose and response format are unknown.","No OpenAPI spec or request/response schema is available.","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.","Without knowing what 'lab/results/61' returns, callers risk paying $0.02 for data they cannot use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/61","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/lab/results/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation for this specific path, no request/response schema, and the endpoint does not appear in the site's own catalog. Effectively a stub 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'/lab/results/61':175 '/request':17,34 '0.02':16,33,143,224 '000':133 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':124 '20':132 '6':140 'Base network API' 'USDC micropayment API' 'accept':147 'access':78,161 'advertis':160,202 'ai':105 'ai/ml':59 'among':178 'amount':127 'analysi':208 'analyt':58,104 'api':5,22,55,77,99,154 'appear':92 'application/json':152 'base':8,25,119,134 'base-network' 'beyond':86 'call':12,29,168 'cannot':242 'case':194 'catalog':100 'categori':203 'classif':211 'collect':46 'confirm':244 'contract':123 'data':57,62,236 'decim':141 'document':85,180,229 'embed':212 'endpoint':6,23,36,109,146,181,241 'equal':142 'exact':81,235 'exchang':215 'feed':214 'financ':106 'finance/web3':61 'focus':102 'function':82 'gate':3,20 'geocod':217 'grant':163 'handl':112 'infer':60 'infrastructur':64 'intend':192 'json-response' 'key':155 'label':88 'land':186 'like':204 'limit':158 'list':72,98 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':41 'maximum':126 'metric':205 'micropay':170 'network':120 'no-api-key' 'offer':44 'openapi':232 'page':187 'part':38 'particular':240 'path':174 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':110 'per':11,28,53,129,167 'per-cal':166 'platform':42,198 'point':226 'post':148 'premium':4,21,76 'premium data endpoint' 'price':213,225 'protocol':50,116 'public':97 'pure':164 'rate':157,216 'report':206 'request':54,130,149 'requir':128 'resourc':68 'respons':189 'return':151,237 'schema':190 'sentiment':207 'site':95,184 'span':56 'spec':233 'specif':67,173 'summar':210 'text':209 'titl':75 'unclear':196 'unit':135 'usd':144 'usdc':14,31,122,137,169 'usdc-micropayment' 'use':121,193 'util':65,108 'via':113 'whole':201 'without':227 'x402':2,19,49,115 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"53af4bc3-9be7-4ce0-a151-7306969b2bad","listingId":"9c2caa17-6c85-4a5b-bac8-87fd0dd23dbf","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/lab/results/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.384Z"}],"sources":[{"listingId":"9c2caa17-6c85-4a5b-bac8-87fd0dd23dbf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.384Z","lastSeenAt":"2026-04-22T01:02:20.105Z"}],"details":{"listingId":"9c2caa17-6c85-4a5b-bac8-87fd0dd23dbf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/61 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/lab/results/61"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/lab/results/61"},{"claim":"The platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or lab results via a single micropayment","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-per-use data retrieval on Base L2"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 USDC payments on Base","Prototyping workflows that need instant, keyless API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume batch processing where per-request fees add up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.254Z"},"updatedAt":"2026-04-22T01:02:20.105Z"}}