{"id":"f016c3b1-e402-4959-9139-086d3202a274","shortId":"yPQS2G","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol. This specific endpoint (`/api/v1/lab/results/32`) is listed as \"Premium API Access\" and returns JSON results upon payment. The site offers endpoints across several categories: Data & Analytics (metrics, reports, 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).\n\nPayment is settled on the Base network using USDC (contract `0x8335…2913`). The x402 challenge for this endpoint specifies a `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. No API keys are required; access is granted immediately upon valid x402 payment. The site claims no rate limits.\n\nThe specific resource at `/api/v1/lab/results/32` appears to be a lab-results endpoint, but no further documentation about its request schema, expected input parameters, or response format was found in the crawl. The endpoint is live and returning a proper 402 challenge. The broader platform is a demonstration of low-fee micropayment APIs, but documentation beyond the landing page is sparse (pricing, README, and /api pages all just show a \"Connect wallet\" prompt).","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","micropayment-api"],"categories":["data","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","lab results API","premium data endpoint"],"warnings":["No documentation found for /api/v1/lab/results/32 — purpose and response format are unknown","No OpenAPI or schema definition available for any endpoint on the site","Pricing, README, and /api pages returned no useful content (just 'Connect wallet')","The endpoint path suggests a specific resource ID (32) which may be demo/sample data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/32","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no documentation for this specific endpoint's input/output schema, no OpenAPI spec, and the crawled pages beyond the landing page are empty (just 'Connect wallet'). The purpose of '/api/v1/lab/results/32' is unclear — it could be sample/demo data. Effectively a stub 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'/api/v1/lab/results/32':51,174 '/request':13,28,147 '0.02':12,27,134,146 '000':126 '0x8335':113 '20':125 '2913':114 '402':210 '6':131 'Base network API' 'USDC API access' 'access':7,22,57,156 'across':68,148 'advertis':142 'ai':77 'analysi':81 'analyt':72 'api':6,21,40,56,152,223 'appear':175 'base':9,24,108,127 'beyond':226 'broader':213 'call':4,19 'categori':70 'challeng':117,211 'claim':166 'classif':84 'collect':34 'connect':241 'consist':137 'contract':112 'convers':101 'crawl':201 'data':71 'decim':132 'demonstr':217 'document':186,225 'embed':85 'endpoint':41,50,67,120,150,182,203 'equal':133 'estim':95 'exchang':90 'expect':191 'export':75 'fee':221 'feed':89 'financ':86 'flat':143 'format':196 'found':198 'gas':94 'gate':42 'generat':102 'geocod':99 'grant':158 'host':32 'immedi':159 'infrastructur':97 'input':192 'insight':76 'json':60 'json-response' 'key':153 'lab':180 'lab results API' 'lab-result':179 'land':228 'learn':79 'limit':169 'list':53 'live':205 'low':220 'low-fe':219 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':78 'maxamountrequir':123 'metric':73 'micropay':222 'micropayment API' 'micropayment-api' 'network':109 'no-api-key' 'offer':66 'page':229,236 'paramet':193 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,63,103,163 'per':3,18,38,135 'platform':214 'premium':5,20,55 'premium data endpoint' 'price':88,144,232 'prompt':243 'proper':209 'protocol':47 'quot':93 'rate':91,168 'readm':233 'report':74 'request':39,136,189 'requir':155 'resourc':172 'respons':195 'result':61,181 'return':59,207 'schema':190 'sentiment':80 'settl':105 'sever':69 'show':239 'site':65,140,165 'spars':231 'specif':49,171 'specifi':121 'summar':83 'text':82 'token':92 'unit':128 'upon':62,160 'usdc':15,30,111 'usdc-base-network' 'use':110 'util':98 'valid':100,161 'via':10,25 'wallet':242 'web3':87 'x402':11,26,45,116,162 'x402 API' 'x402-payment'","prices":[{"id":"2aad7ac2-852e-4aef-b437-26974505b8c9","listingId":"f016c3b1-e402-4959-9139-086d3202a274","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.087Z"}],"sources":[{"listingId":"f016c3b1-e402-4959-9139-086d3202a274","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.087Z","lastSeenAt":"2026-04-22T01:02:19.575Z"}],"details":{"listingId":"f016c3b1-e402-4959-9139-086d3202a274","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/32 \\\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 site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/lab/results/32"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data results without subscription or API key management","Demonstrating x402 micropayment integration for per-call billing","Programmatic retrieval of lab results data via crypto-settled requests"],"bestFor":["Developers exploring x402 payment protocol integration","Agents that need keyless, pay-per-use API access on Base","Low-volume consumers who want no-commitment API access"],"notFor":["High-volume consumers who need bulk pricing or subscription discounts","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.77Z"},"updatedAt":"2026-04-22T01:02:19.575Z"}}