{"id":"816fa0cc-5492-48de-befb-9fbf084b48ca","shortId":"wB3HT5","kind":"x402","title":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/lab/results/58` is part of the lowpaymentfee.com platform, which offers a suite of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific resource at path `/lab/results/58` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label — it may return lab or experimental results data. Payment is settled on the Base network using USDC (contract `0x8335…2913`) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe platform advertises a uniform $0.02-per-request pricing model with no API keys, no rate limits, and no minimum commitments. All endpoints use the x402 payment protocol (version 1, \"exact\" scheme): callers attach an `X-PAYMENT` header containing a signed payment proof, and the server verifies it before returning the JSON response. The payment timeout is 300 seconds. The endpoint accepts HTTP POST and returns `application/json`.\n\nBecause the specific `/lab/results/58` path is not listed on the provider's landing page alongside the other documented APIs, its exact input parameters and response schema are unknown. The broader platform hosts endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same price point. Without further documentation or an OpenAPI spec, callers should treat this particular endpoint as experimental.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","no-api-key","http-post"],"categories":["data","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","premium data endpoint","402 payment required API"],"warnings":["The /api/v1/lab/results/58 path is not listed among the provider's documented APIs — its function is unclear.","No OpenAPI spec, request schema, or response schema is available.","No documentation pages rendered meaningful content (pricing, README, and /api pages only showed 'Connect wallet').","Endpoint purpose labeled only as 'Premium API Access' with no further detail."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/58","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but the specific /lab/results/58 path is not documented on the provider's site, there is no OpenAPI spec, no request/response schema, and no examples. The endpoint's actual purpose is 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'/lab/results/58':67,190 '0.02':10,24,108,123 '000':112 '0x8335':101 '1':148 '20':111 '2913':102 '300':177 '402 payment required API' '6':116 'Base network API' 'USDC micropayment API' 'accept':181 'access':72 'advertis':120 'ai/ml':55 'alongsid':201 'analysi':222 'analyt':54 'api':5,19,51,71,131,205 'application/json':186 'attach':152 'base':8,22,96,113 'base-network' 'beyond':80 'broader':216 'caller':151,249 'classif':225 'commit':139 'contain':158 'contract':100 'convers':233 'cost':106 'data':53,58,90 'decim':117 'document':79,204,244 'embed':226 'endpoint':6,20,30,141,180,219,254 'exact':75,149,207 'exchang':229 'experiment':88,256 'feed':228 'finance/web3':57 'function':76 'gate':3,17 'geocod':231 'header':157 'host':218 'http':182 'http-post' 'infer':56 'infrastructur':60 'input':208 'json':171 'json-api' 'key':132 'lab':86 'label':69,82 'land':199 'limit':135 'list':194 'lowpaymentfee' 'lowpaymentfee.com':37 'maximum':105 'may':84 'minimum':138 'model':128 'network':97 'no-api-key' 'offer':40 'openapi':247 'page':200 'paramet':209 'part':34 'particular':253 'path':66,191 'pay':9,23,48 'pay-per-call API' 'pay-per-request':47 'payment':91,145,156,161,174 'per':11,25,49,109,125 'per-request':124 'platform':38,119,217 'point':241 'post':183 'premium':4,18,70 'premium data endpoint' 'price':127,227,240 'proof':162 'protocol':46,146 'provid':197 'rate':134,230 'request':12,26,50,110,126 'resourc':64 'respons':172,211 'result':89 'return':85,169,185 'schema':212 'scheme':150 'second':178 'sentiment':221 'server':165 'settl':93 'sign':160 'span':52 'spec':248 'specif':63,189 'suit':42 'summar':224 'text':223 'timeout':175 'treat':251 'uniform':122 'unit':114 'unknown':214 'usdc':14,28,99 'usdc-settlement' 'use':98,142 'util':61 'valid':232 'verifi':166 'version':147 'without':242 'x':155 'x-payment':154 'x402':2,16,45,144 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"cb35f71d-e814-4105-8ecb-b770c4c3c62e","listingId":"816fa0cc-5492-48de-befb-9fbf084b48ca","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.727Z"}],"sources":[{"listingId":"816fa0cc-5492-48de-befb-9fbf084b48ca","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.727Z","lastSeenAt":"2026-04-22T02:32:04.639Z"}],"details":{"listingId":"816fa0cc-5492-48de-befb-9fbf084b48ca","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/58 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/lab/results/58"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/lab/results/58"}],"useCases":["Accessing gated data or lab results via a single micropayment per request","Integrating pay-per-use API calls into agent workflows without managing API keys","Programmatic data retrieval settled on-chain via USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-request API access","AI agents that can settle x402 payments autonomously","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users who need detailed API documentation and guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.663Z"},"updatedAt":"2026-04-22T02:32:04.639Z"}}