{"id":"5f59468d-fade-403c-9743-80904f11a281","shortId":"cfu6nn","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 is a pay-per-request API platform that gates access to a broad set of endpoints using the x402 payment protocol. The specific endpoint at `/api/v1/lab/results/63` is listed as \"Premium API Access\" and accepts payment in USDC on the Base network. The x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (i.e., $0.02) per request. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across four 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 uniformly priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/lab/results/63`) falls outside the categories listed on the homepage and its exact functionality is not documented. The name \"Premium API Access\" and the path segment \"lab/results/63\" suggest it may return results for a specific lab or experimental resource, but no schema or documentation is available to confirm what data it returns. The endpoint accepts POST requests and returns `application/json`.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","post-method"],"categories":["data","api-gateway"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay per call API","USDC API access","micropayment API","Base network API"],"warnings":["No documentation available for the /api/v1/lab/results/63 endpoint — its actual response payload is unknown.","This endpoint path does not appear in the provider's homepage API listing; it may be experimental or unlisted.","No OpenAPI spec, no request/response schema, and no examples are available.","The /pricing and /README pages returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/63","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/63","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 there is no documentation, no OpenAPI schema, and no description of what this specific endpoint actually returns. The path 'lab/results/63' is not listed among the homepage's advertised APIs, making it effectively a stub 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'/request':13,28 '0.02':12,27,93,165 '000':87 '20':86 'Base network API' 'USDC API access' 'accept':66,224 'access':7,22,42,64,191 'across':123 'advertis':103 'ai':133 'analysi':137 'analyt':127 'api':6,21,38,63,97,190 'application/json':229 'attach':106 'avail':215 'base':9,24,72,88 'broad':45 'broader':119 'call':4,19 'caller':104 'categori':125,175 'challeng':76 'classif':140 'confirm':77,217 'convers':157 'data':126,130,219 'document':186,213 'embed':141 'endpoint':48,56,79,122,160,170,223 'estim':151 'exact':182 'exchang':146 'experiment':207 'export':131 'fall':172 'feed':145 'financ':142 'four':124 'function':183 'gas':150 'gate':41 'generat':158 'geocod':155 'header':111 'homepag':179 'i.e':92 'infrastructur':153 'insight':132 'json-response' 'key':98 'lab':205 'lab/results/63':196 'learn':135 'limit':101 'list':60,176 'live':81 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':134 'maximum':84 'may':199 'metric':128 'micropayment API' 'name':188 'network':73 'no-api-key' 'offer':121 'outsid':173 'particular':169 'path':194 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':52,67,110,116 'per':3,18,36,94,166 'platform':39,120 'post':225 'post-method' 'premium':5,20,62,189 'price':144,163 'proof':117 'protocol':53 'quot':149 'rate':100,147 'report':129 'request':37,95,167,226 'requir':82 'resourc':208 'result':201 'return':200,221,228 'schema':211 'segment':195 'sentiment':136 'set':46 'simpli':105 'specif':55,204 'suggest':197 'summar':139 'text':138 'token':148 'uniform':162 'unit':89 'usdc':15,30,69,91 'usdc-base' 'use':49 'util':154 'valid':114,156 'via':10,25 'web3':143 'x':109 'x-payment':108 'x402':11,26,51,75,115 'x402 API' 'x402-payment'","prices":[{"id":"2d67c491-08bf-497d-bc97-b049dfe61a6c","listingId":"5f59468d-fade-403c-9743-80904f11a281","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.500Z"}],"sources":[{"listingId":"5f59468d-fade-403c-9743-80904f11a281","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.500Z","lastSeenAt":"2026-04-22T01:02:20.277Z"}],"details":{"listingId":"5f59468d-fade-403c-9743-80904f11a281","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/63 \\\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 x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/63"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, making 20000 base units equal to $0.02","source_url":"https://lowpaymentfee.com/api/v1/lab/results/63"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or lab results behind a per-call paywall","Programmatic pay-as-you-go API consumption without subscriptions","Agent-driven workflows that need instant API access without key provisioning"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Prototyping and low-volume usage where $0.02/call is cost-effective"],"notFor":["High-volume production workloads where per-call pricing adds up quickly","Users who need detailed documentation or SLA guarantees before integrating","Callers who cannot settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.993Z"},"updatedAt":"2026-04-22T01:02:20.277Z"}}