{"id":"03f56577-74a7-4797-8606-e8da7625d834","shortId":"HULBAB","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides pay-per-request API access using the x402 protocol, settling payments in USDC on the Base network. The specific resource `/api/v1/lab/results/47` is listed under \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which is 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers a suite of endpoints 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 uniformly at $0.02 per request.\n\nHowever, the specific endpoint `/api/v1/lab/results/47` does not clearly map to any of the documented API categories on the landing page. It appears under a \"lab/results\" path that is not described in the available documentation. The endpoint is live and returns a proper 402 challenge, but the actual data returned upon successful payment is unknown — there is no OpenAPI schema, no example responses, and no detailed documentation beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["data","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium data endpoint","crypto-paid API"],"warnings":["The path /api/v1/lab/results/47 does not appear in the provider's documented API catalog — its purpose and response format are unknown.","No OpenAPI schema, example request body, or example response is available.","No detailed documentation pages were accessible (pricing, README, and /api pages only showed 'Connect wallet').","The actual data returned upon successful payment is entirely unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/47","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but the specific resource '/api/v1/lab/results/47' is undocumented — no schema, no example responses, and no description beyond the generic 'Premium API Access' label. The landing page documents other endpoints but not this one, making it effectively a stub 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'/request':13,28 '0.02':12,27,68,83,155 '000':74 '20':73 '402':200 '6':81 'Base network API' 'USDC micropayment API' 'access':7,22,41,63,229 'actual':204 'ai':123 'analysi':127 'analyt':117 'api':6,21,40,62,85,172,228 'appear':179 'attach':94 'avail':190 'base':9,24,52,75 'beyond':224 'broader':107 'call':4,19,70 'caller':92 'categori':173 'challeng':201 'classif':130 'clear':165 'convers':147 'cost':65 'crypto-paid API' 'data':116,120,205 'decim':82 'describ':187 'detail':222 'document':171,191,223 'embed':131 'endpoint':32,114,150,161,193 'estim':141 'exampl':218 'exchang':136 'export':121 'feed':135 'financ':132 'gas':140 'generat':148 'generic':226 'geocod':145 'header':99 'howev':158 'http-post' 'infrastructur':143 'insight':122 'json-response' 'key':86 'lab/results':182 'label':230 'land':176 'learn':125 'limit':89 'list':59 'live':195 'lowpaymentfee' 'lowpaymentfee.com':34,108 'machin':124 'map':166 'maxamountrequir':71 'metric':118 'network':53 'no-api-key' 'offer':110 'openapi':215 'page':177 'path':183 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':47,98,104,209 'per':3,18,38,69,156 'platform':109 'premium':5,20,61,227 'premium data endpoint' 'price':134,152 'proof':105 'proper':199 'protocol':45 'provid':35 'quot':139 'rate':88,137 'report':119 'request':39,157 'requir':91 'resourc':56 'respons':219 'return':197,206 'schema':216 'sentiment':126 'settl':46 'simpli':93 'span':115 'specif':55,160 'success':208 'suit':112 'summar':129 'text':128 'token':138 'uniform':153 'unit':76 'unknown':211 'upon':207 'usdc':15,30,49,78 'usdc-base-network' 'use':42 'util':144 'valid':102,146 'via':10,25 'web3':133 'x':97 'x-payment':96 'x402':11,26,44,103 'x402 API' 'x402-payment'","prices":[{"id":"af4cead2-4ab2-4232-bd1f-24568f6aead1","listingId":"03f56577-74a7-4797-8606-e8da7625d834","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.362Z"}],"sources":[{"listingId":"03f56577-74a7-4797-8606-e8da7625d834","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.362Z","lastSeenAt":"2026-04-22T01:02:20.064Z"}],"details":{"listingId":"03f56577-74a7-4797-8606-e8da7625d834","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/47 \\\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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/47"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/47"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data results behind a per-call USDC paywall","Agent-driven API consumption without pre-registration or API keys","Programmatic micropayment-gated data retrieval on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed documentation or guaranteed SLAs before purchasing","Anyone without USDC on the Base network","Use cases requiring free or bulk-discounted access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.255Z"},"updatedAt":"2026-04-22T01:02:20.064Z"}}