{"id":"cf34305c-c8d8-4d50-a9e2-9f0f88e81d02","shortId":"Sa2NEB","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/55` is listed under \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of endpoints spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all priced at $0.02 per request. However, the specific endpoint `/api/v1/lab/results/55` falls under a \"lab/results\" path that is not explicitly listed in the site's public catalog, so its exact functionality is unclear. The x402 challenge confirms it is live, accepts POST requests, and returns application/json.\n\nWithout OpenAPI documentation, request/response schemas, or example payloads for this specific endpoint, the precise data returned and the expected POST body remain unknown. The endpoint is confirmed live via a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["data","api-marketplace"],"synonyms":["pay per call API","x402 API","USDC API","Base network API","micropayment API","lowpaymentfee","lab results API","premium data endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The path /api/v1/lab/results/55 is not listed in the site's public API catalog — its purpose is unclear","No example request or response bodies are available","Crawled /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet')"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/55","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation for the specific /api/v1/lab/results/55 path, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The endpoint's actual functionality is 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'/request':13,28 '0.02':12,27,68,82,148 '000':74 '20':73 '402':222 '6':80 'Base network API' 'USDC API' 'accept':185 'access':7,22,41,63 'advertis':111 'ai':120 'analysi':124 'analyt':119 'api':6,21,40,62,84 'application/json':190 'attach':95 'base':9,24,52,75 'base-network' 'bodi':211 'broader':108 'call':4,19,70 'caller':93 'catalog':114,171 'challeng':180,223 'classif':126 'commit':90 'confirm':181,217 'convers':143 'cost':65 'data':118,205 'decim':81 'document':193 'embed':127 'endpoint':32,116,154,202,215 'estim':137 'exact':174 'exampl':197 'exchang':132 'expect':209 'explicit':164 'fall':156 'feed':131 'financ':128 'function':175 'gas':136 'generat':144 'geocod':141 'header':100 'howev':151 'infrastructur':139 'json-response' 'key':85 'lab results API' 'lab/results':159 'learn':122 'limit':87 'list':59,165 'live':184,218 'lowpaymentfee' 'lowpaymentfee.com':34,109 'machin':121 'maxamountrequir':71 'micropayment API' 'network':53 'no-api-key' 'openapi':192 'path':160 'pay':2,17,37 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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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.528Z"}],"sources":[{"listingId":"cf34305c-c8d8-4d50-a9e2-9f0f88e81d02","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.528Z","lastSeenAt":"2026-04-22T01:02:20.309Z"}],"details":{"listingId":"cf34305c-c8d8-4d50-a9e2-9f0f88e81d02","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/55 \\\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/55"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/55"},{"claim":"All listed APIs 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"}],"useCases":["Accessing premium data results behind a per-call paywall without subscription","Agent-driven programmatic data retrieval with automatic crypto micropayments","Integrating pay-as-you-go API calls into workflows on the Base L2 network"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation and schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.007Z"},"updatedAt":"2026-04-22T01:02:20.309Z"}}