{"id":"c18a2d62-c6ad-4f39-a332-e50ed5a89ac7","shortId":"8zbtbx","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/22` is labeled \"Premium API Access\" and costs up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys, rate limits, or subscriptions are required — each request is individually paid for via an on-chain micropayment.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog 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 listed at the same $0.02/request price point.\n\nHowever, the specific endpoint being listed here (`/api/v1/lab/results/22`) does not clearly map to any of the documented categories on the landing page. Its purpose — whether it returns lab test results, experimental data, or something else — is not documented. The x402 challenge confirms the endpoint is live and accepting POST requests, but no request/response schema or documentation is available for this particular resource. Callers should be prepared for an unknown response format.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["data","api-marketplace"],"synonyms":["micropayment API","x402 endpoint","pay-per-call API","USDC API","Base network API","low fee API","premium data access"],"warnings":["The endpoint /api/v1/lab/results/22 is not documented anywhere on the provider's site — its purpose and response format are unknown.","No OpenAPI spec, request schema, or response schema is available.","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.","The 'lab/results/22' path suggests a specific resource ID; it is unclear whether other IDs exist or what 'lab results' refers to."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/22","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but the specific endpoint /api/v1/lab/results/22 has no documentation, no request/response schema, and its purpose is unclear. The landing page documents other endpoints but not this one. Effectively a stub 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'/request':13,28,154 '0.02':12,27,73,153 '000':67 '20':66 '6':79 'Base network API' 'USDC API' 'accept':204 'access':7,22,41,61 'advertis':106 'ai':120 'analysi':124 'analyt':114 'api':6,21,40,60,82 'avail':214 'base':9,24,49,68 'base-network' 'broader':103 'call':4,19,75 'caller':219 'catalog':109 'categori':174 'chain':100 'challeng':197 'classif':127 'clear':167 'confirm':198 'convers':144 'cost':63 'data':113,117,188 'decim':80 'document':173,194,212 'els':191 'embed':128 'endpoint':32,111,147,160,200 'estim':138 'exchang':133 'experiment':187 'export':118 'feed':132 'financ':129 'format':227 'gas':137 'generat':145 'geocod':142 'howev':157 'i.e':72 'individu':93 'infrastructur':140 'insight':119 'key':83 'lab':184 'label':58 'land':177 'learn':122 'limit':85 'list':149,162 'live':202 'low fee API' 'lowpaymentfee.com':34,104 'machin':121 'map':168 'metric':115 'micropay':101 'micropayment API' 'network':50 'no-api-key' 'on-chain':98 'page':178 'paid':94 'particular':217 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'per':3,18,38,74 'platform':105 'point':156 'post':205 'post-endpoint' 'premium':5,20,59 'premium data access' 'prepar':222 'price':131,155 'protocol':46 'provid':35 'purpos':180 'quot':136 'rate':84,134 'report':116 'request':39,91,206 'request/response':209 'requir':89 'resourc':55,218 'respons':226 'result':186 'return':183 'schema':210 'sentiment':123 'settl':42 'sinc':76 'someth':190 'span':112 'specif':54,159 'subscript':87 'summar':126 'test':185 'text':125 'token':135 'unit':69 'unknown':225 'usdc':15,30,52,71,77 'usdc-micropayment' 'use':51,78 'util':141 'valid':143 'via':10,25,43,96 'web3':130 'whether':181 'wide':108 'x402':11,26,45,196 'x402 endpoint' 'x402-payment'","prices":[{"id":"3321eb11-eae5-407d-820e-64e341426a2f","listingId":"c18a2d62-c6ad-4f39-a332-e50ed5a89ac7","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.988Z"}],"sources":[{"listingId":"c18a2d62-c6ad-4f39-a332-e50ed5a89ac7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.988Z","lastSeenAt":"2026-04-22T05:32:13.008Z"}],"details":{"listingId":"c18a2d62-c6ad-4f39-a332-e50ed5a89ac7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/22\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with a valid x402 payment proof to access the resource.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/lab/results/22"},{"claim":"All listed endpoints cost $0.02 per request 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/22"}],"useCases":["Accessing premium data behind a per-request USDC micropayment wall","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go data retrieval on Base L2"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing well-documented request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.895Z"},"updatedAt":"2026-04-22T05:32:13.008Z"}}