{"id":"00d3bb75-72d8-4a03-abc8-e0923858c283","shortId":"TXy6TV","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 payment protocol, settling in USDC on the Base network. The specific path `/api/v1/lab/results/83` is labeled \"Premium API Access\" and returns application/json responses. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform offers a suite of endpoints across several categories: 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/lab/results/83` does not clearly map to any of the documented categories on the landing page — it appears under a \"lab/results\" path that is not described elsewhere. There is no OpenAPI schema, no detailed documentation for request parameters or response format, and no usage examples available. The endpoint is confirmed live (returns a valid 402 challenge), but the actual data it returns upon payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api","data"],"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/83 is not listed or documented on the provider's landing page — its purpose and response content are unknown.","No OpenAPI spec, request schema, or response schema is available.","No documentation pages rendered meaningful content (pricing, README, and /api pages only show 'Connect wallet').","The actual data returned upon successful payment is completely undocumented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/83","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and settlement details. However, the specific path '/api/v1/lab/results/83' is not documented anywhere on the site, there is no OpenAPI schema, no request/response examples, and no description of what data is actually returned. This is effectively a stub 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'/request':13,28 '0.02':12,27,84,137 '000':75 '20':74 '402':208 '6':80 'Base network API' 'USDC micropayment API' 'access':7,22,41,62 'across':96 'actual':212 'advertis':70 'ai':106 'analysi':110 'analyt':100 'api':6,21,40,61,142 'appear':171 'application/json':65 'avail':199 'base':9,24,52,76 'base-network' 'broader':88 'call':4,19 'categori':98,165 'challeng':69,209 'classif':113 'clear':158 'commit':150 'confirm':203 'convers':130 'crypto-paid API' 'data':99,103,213 'decim':81 'describ':179 'detail':187 'document':164,188 'elsewher':180 'embed':114 'endpoint':32,95,133,154,201 'equal':83 'estim':124 'exampl':198 'exchang':119 'export':104 'feed':118 'financ':115 'format':194 'gas':123 'generat':131 'geocod':128 'infrastructur':126 'insight':105 'json-response' 'key':143 'lab/results':174 'label':59 'land':168 'learn':108 'limit':146 'list':135 'live':204 'lowpaymentfee' 'lowpaymentfee.com':34,89 'machin':107 'map':159 'maxamountrequir':72 'metric':101 'minimum':149 'network':53 'no-api-key' 'offer':91 'openapi':184 'page':169 'paramet':191 'path':56,175 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':45,217 'per':3,18,38,85,138 'platform':90 'premium':5,20,60 'premium data endpoint' 'price':117 'protocol':46 'provid':35 'quot':122 'rate':120,145 'report':102 'request':39,86,139,190 'requir':151 'respons':66,193 'return':64,205,215 'schema':185 'sentiment':109 'settl':47 'sever':97 'specif':55,153 'suit':93 'summar':112 'text':111 'token':121 'unit':77 'unknown':219 'upon':216 'usag':197 'usdc':15,30,49,79 'usdc-settlement' 'use':42 'util':127 'valid':129,207 'via':10,25 'web3':116 'x402':11,26,44,68 'x402 API' 'x402-payment'","prices":[{"id":"879df5c3-dbdc-41b0-9c2e-ad7d7c8e53b2","listingId":"00d3bb75-72d8-4a03-abc8-e0923858c283","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.589Z"}],"sources":[{"listingId":"00d3bb75-72d8-4a03-abc8-e0923858c283","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.589Z","lastSeenAt":"2026-04-22T01:02:20.391Z"}],"details":{"listingId":"00d3bb75-72d8-4a03-abc8-e0923858c283","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/83 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/83"},{"claim":"All endpoints on the platform are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/83"}],"useCases":["Accessing premium data or lab results via a single micropayment without account registration","Integrating pay-per-call API access into agent workflows using x402 protocol","Programmatic retrieval of JSON data with USDC micropayments on Base"],"bestFor":["Developers wanting no-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate-limited guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.876Z"},"updatedAt":"2026-04-22T01:02:20.391Z"}}