{"id":"f184c66a-c1e6-45f2-a382-fb8852626f11","shortId":"meGZRK","kind":"x402","title":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/81` appears to be an API-key provisioning or access endpoint. The x402 challenge confirms it is live, accepting POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) to the payee address 0x1A2B…85F3. The response MIME type is application/json. No OpenAPI schema, detailed documentation, or example responses were found in the crawl — the docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point with no API keys, no rate limits, and instant access. However, no documentation describing request/response schemas for any of these endpoints was available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-provisioning","json-response"],"categories":["infrastructure","api-access"],"synonyms":["premium API access","x402 API key","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint on this platform","Docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no substantive content","The exact purpose and response format of /api/v1/apikeys/81 is unclear — 'Premium API Access' is the only description","Cannot verify what the broader advertised endpoints (AI, finance, utils) actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/81","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/apikeys/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI schema, no documentation, no example requests or responses, and the docs/pricing/API pages are all empty beyond a wallet-connect prompt. The purpose of this specific endpoint (apikeys/81) is unclear — it could provision an API key or grant access, but this is inferred from the name 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'/request':204 '0.02':10,24,77,130,203 '000':119 '0x1a2b':135 '0x8335':124 '20':118 '2913':125 '6':128 '85f3':136 'Base network API' 'USDC micropayment API' 'accept':109 'access':36,100,216 'address':134 'advertis':177 'ai':66 'analysi':181 'analyt':65 'api':4,18,35,62,96,159,209 'api-key':95 'api-key-provisioning' 'appear':91 'application/json':142 'avail':229 'base':8,22,85,120,127 'broader':175 'call':61 'challeng':104 'classif':184 'confirm':105 'connect':167 'content':173 'convers':196 'crawl':155 'data':64 'decim':129 'describ':220 'detail':146 'doc':157 'document':147,219 'embed':185 'endpoint':6,20,30,47,89,101,178,227 'estim':193 'exact':115 'exampl':149 'exchang':188 'feed':187 'financ':69 'found':152 'gas':192 'gate':3,17 'generat':198 'geocod':194 'host':54 'howev':217 'infrastructur':72 'instant':215 'json-response' 'key':5,19,97,210 'learn':68 'limit':213 'live':108 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':67 'mani':46 'mime':139 'network':86 'offer':48 'one':44 'openapi':144 'page':162 'pay':9,23,59 'pay-per-cal':58 'pay-per-call API' 'pay-per-request' 'paye':133 'payment':40,116 'per':13,27,60,78 'platform':52,176 'point':206 'post':110 'premium':34 'premium API access' 'price':75,158,186,205 'prompt':169 'protocol':41 'provid':33 'provis':98 'quot':191 'rate':189,212 'readm':161 'request':14,28,79,111 'request/response':221 'requir':113 'respons':138,150 'return':164 'schema':145,222 'sentiment':180 'settl':80 'span':63 'specif':88 'substant':172 'summar':183 'text':182 'token':190 'type':140 'unit':121 'usdc':12,26,82,123 'usdc-base' 'util':73 'valid':195 'varieti':56 'via':37 'wallet':168 'web3':70 'x402':2,16,39,103 'x402 API key' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5952c044-e13b-468a-bffa-6598bd6d89b7","listingId":"f184c66a-c1e6-45f2-a382-fb8852626f11","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/apikeys/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:42.736Z"}],"sources":[{"listingId":"f184c66a-c1e6-45f2-a382-fb8852626f11","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:42.736Z","lastSeenAt":"2026-04-23T04:02:11.927Z"}],"details":{"listingId":"f184c66a-c1e6-45f2-a382-fb8852626f11","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/81 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge requiring 20,000 base units of USDC on Base ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/apikeys/81"},{"claim":"The platform advertises APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform claims no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/81"}],"useCases":["Programmatically obtaining API keys or access tokens via a single micropayment","Agents purchasing on-demand API access without pre-registration","Integrating pay-per-use API access into automated workflows"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","Micropayment-based API consumption on Base L2","Scenarios where no API key management or rate-limit negotiation is desired"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription plans","Anyone unable to settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.5Z"},"updatedAt":"2026-04-23T04:02:11.927Z"}}