{"id":"3f030f7f-2e83-41a1-a7db-775931c723c7","shortId":"sKZ6fJ","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 settled via the x402 protocol on the Base network using USDC. The specific resource `/api/v1/lab/results/18` is listed under \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each POST request.\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 at $0.02 per request and settle on the Base network.\n\nThe specific content returned by `/api/v1/lab/results/18` is not documented — the endpoint name suggests it returns some form of lab or experimental results identified by ID 18, but no schema or sample response is available. The response MIME type is `application/json`. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC at contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["data","api-marketplace"],"synonyms":["x402 API","pay per call API","USDC micropayment API","Base network API","lowpaymentfee","lab results API","premium data endpoint"],"warnings":["No documentation available for the specific endpoint /api/v1/lab/results/18 — its purpose and response format are unknown","No OpenAPI spec, response schema, or example responses provided","The /api, /pricing, and /README pages returned no useful content (just 'Connect wallet')","This endpoint path (lab/results/18) does not appear in the site's listed API catalog, suggesting it may be experimental or unlisted"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/18","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation on what `/api/v1/lab/results/18` actually returns — no response schema, no example payloads, and no OpenAPI spec. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The endpoint's purpose must be guessed from its URL 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'/request':13,28 '0.02':12,27,67,148 '000':71 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':202 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':207 '18':182 '20':70 '6':77 'Base network API' 'USDC micropayment API' 'access':7,22,41,62 'address':201 'ai':117 'analysi':121 'analyt':111 'api':6,21,40,61,80 'application/json':196 'attach':91 'avail':190 'base':9,24,49,72,155,209 'broader':101 'call':4,19,69 'caller':89 'classif':124 'commit':86 'content':159 'contract':206 'convers':141 'cost':64 'data':110,114 'decim':78 'document':165 'embed':125 'endpoint':32,108,144,167 'estim':135 'exchang':130 'experiment':177 'export':115 'feed':129 'financ':126 'form':173 'gas':134 'generat':142 'geocod':139 'header':95 'id':181 'identifi':179 'infrastructur':137 'insight':116 'json-response' 'key':81 'lab':175 'lab results API' 'learn':119 'limit':83 'list':58 'lowpaymentfee' 'lowpaymentfee.com':34,102 'machin':118 'metric':112 'mime':193 'name':168 'network':50,156 'no-api-key' 'no-rate-limit' 'offer':104 'pay':2,17,37 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':36 'payment':94,197 'per':3,18,38,68,149 'platform':103 'post':98 'premium':5,20,60 'premium data endpoint' 'price':128,146 'protocol':46 'provid':35 'quot':133 'rate':82,131 'report':113 'request':39,99,150 'requir':88 'resourc':55 'respons':188,192 'result':178 'return':160,171 'sampl':187 'schema':185 'sent':199 'sentiment':120 'settl':42,152 'simpli':90 'span':109 'specif':54,158 'suggest':169 'suit':106 'summar':123 'text':122 'token':132 'type':194 'unit':73 'upfront':85 'usdc':15,30,52,75,204 'usdc-base' 'use':51,203 'util':138 'valid':140 'via':10,25,43 'web3':127 'x402':11,26,45,93 'x402 API' 'x402-payment'","prices":[{"id":"8cf8d3a3-696a-48d3-94ab-6917d334a0fb","listingId":"3f030f7f-2e83-41a1-a7db-775931c723c7","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.907Z"}],"sources":[{"listingId":"3f030f7f-2e83-41a1-a7db-775931c723c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.907Z","lastSeenAt":"2026-04-22T05:32:12.887Z"}],"details":{"listingId":"3f030f7f-2e83-41a1-a7db-775931c723c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/18 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/lab/results/18","method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/18"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/18"},{"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":"Platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data results without needing an API key or subscription","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Programmatic retrieval of lab/experimental result data behind a paywall"],"bestFor":["Developers wanting zero-friction pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed documentation or response schemas 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":"2026-02-17T23:13:05.021Z"},"updatedAt":"2026-04-22T05:32:12.887Z"}}