{"id":"79dcef0b-2af9-4f0e-b1d0-f4d3c86186fb","shortId":"LSPJBX","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/59` 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 with an on-chain USDC micro-payment.\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/59`) does not clearly map to any of the documented categories on the landing page. Its exact functionality — what \"lab results\" it returns — is not described in any available documentation. The endpoint is confirmed live (returns a valid x402 402 challenge), accepts POST requests, and returns application/json. Without further documentation or example responses, the precise data returned remains unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["data","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","lab results API","premium API"],"warnings":["The specific endpoint /api/v1/lab/results/59 is not documented anywhere on the provider's site — its purpose and response format are unknown.","No OpenAPI spec, example responses, or detailed documentation available.","The landing page categories (Data & Analytics, AI & ML, Finance, Infrastructure) do not include a 'lab/results' path — this may be a test or unlisted endpoint.","The /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/59","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation explaining what /api/v1/lab/results/59 actually returns, no OpenAPI schema, no example requests or responses, and the endpoint path doesn't match any category listed on the provider's landing page. This is effectively a stub 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'/request':13,28,157 '0.02':12,27,73,156 '000':67 '20':66 '402':206 '6':79 'Base network API' 'USDC API' 'accept':208 'access':7,22,41,61 'advertis':109 'ai':123 'analysi':127 'analyt':117 'api':6,21,40,60,82 'application/json':213 'avail':195 'base':9,24,49,68 'base-network' 'broader':106 'call':4,19,75 'catalog':112 'categori':177 'chain':100 'challeng':207 'classif':130 'clear':170 'confirm':200 'convers':147 'cost':63 'data':116,120,222 'decim':80 'describ':192 'document':176,196,216 'embed':131 'endpoint':32,114,150,163,198 'estim':141 'exact':183 'exampl':218 'exchang':136 'export':121 'feed':135 'financ':132 'function':184 'gas':140 'generat':148 'geocod':145 'howev':160 'i.e':72 'individu':93 'infrastructur':143 'insight':122 'json-response' 'key':83 'lab':186 'lab results API' 'label':58 'land':180 'learn':125 'limit':85 'list':152,165 'live':201 'lowpaymentfee' 'lowpaymentfee.com':34,107 'machin':124 'map':171 'metric':118 'micro':103 'micro-pay':102 'micropayment API' 'network':50 'no-api-key' 'on-chain':98 'page':181 'paid':94 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':104 'per':3,18,38,74 'platform':108 'point':159 'post':209 'post-method' 'precis':221 'premium':5,20,59 'premium API' 'price':134,158 'protocol':46 'provid':35 'quot':139 'rate':84,137 'remain':224 'report':119 'request':39,91,210 'requir':89 'resourc':55 'respons':219 'result':187 'return':189,202,212,223 'sentiment':126 'settl':42 'sinc':76 'span':115 'specif':54,162 'subscript':87 'summar':129 'text':128 'token':138 'unit':69 'unknown':225 'usdc':15,30,52,71,77,101 'usdc-micropayment' 'use':51,78 'util':144 'valid':146,204 'via':10,25,43 'web3':133 'wide':111 'without':214 'x402':11,26,45,205 'x402 API' 'x402-payment'","prices":[{"id":"e763cff6-cf39-4ef2-ad27-aa1fd6a96842","listingId":"79dcef0b-2af9-4f0e-b1d0-f4d3c86186fb","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/59","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":"79dcef0b-2af9-4f0e-b1d0-f4d3c86186fb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.528Z","lastSeenAt":"2026-04-22T01:02:20.310Z"}],"details":{"listingId":"79dcef0b-2af9-4f0e-b1d0-f4d3c86186fb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/59\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC payment to receive data.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/59"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/59"},{"claim":"All listed endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","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 endpoints without subscription or API key management","Making one-off paid API calls settled on-chain via USDC on Base","Integrating pay-per-request data retrieval into agent workflows"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer on-chain micropayments over traditional billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs 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":"2026-02-17T23:13:03.992Z"},"updatedAt":"2026-04-22T01:02:20.310Z"}}