{"id":"8d15a69c-d094-42b5-9e1e-428317d5b24b","shortId":"dRZtvk","kind":"x402","title":"x402-gated API key endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated API key endpoint on Base, pay $0.02 per request in USDC.","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 endpoints on the platform are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/48` appears to be an API key provisioning or access endpoint. The x402 challenge confirms it is live, accepting POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys required, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this endpoint are unknown. The platform lists other endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more — all at the same $0.02 price point.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-provisioning","post-method"],"categories":["infrastructure","api-access"],"synonyms":["premium API access","API key purchase","x402 API","pay-per-call API","USDC API payment","Base network API","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, and /README pages all show only 'Connect wallet' with no content.","Request and response schemas are completely unknown; no OpenAPI spec or examples provided.","The exact purpose of /api/v1/apikeys/48 is unclear — 'Premium API Access' is the only description.","The platform lists many endpoints but none have documented input/output formats."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/48","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/48","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, but there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, and no information about what the request body should contain or what the response looks like. The purpose of the specific /apikeys/48 path is unclear — it could provision an API key or grant access to something, but this is only inferred from the URL and 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'/docs':167 '/pricing':168 '/readme':169 '0.02':10,24,82,135,214 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':129 '20':123 '2913':130 '300':149 '6':139 'API key purchase' 'Base network API' 'USDC API payment' 'accept':113 'access':36,104,164 'actual':183 'address':145 'advertis':154 'ai':66 'analysi':198 'analyt':65 'api':4,18,35,62,100,156 'api-key-provisioning' 'appear':96 'base':8,22,90,125,132 'call':61 'challeng':108 'classif':201 'confirm':109 'connect':174 'content':180 'data':64 'decim':140 'document':165 'embed':202 'endpoint':6,20,30,47,75,94,105,188,195 'equal':134 'exchang':205 'feed':204 'financ':69 'gate':3,17 'geocod':207 'given':136 'host':54 'infrastructur':72 'instant':163 'key':5,19,101,157 'learn':68 'limit':161 'list':193 'live':112 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':67 'made':143 'mani':46 'network':91 'offer':48 'one':44 'page':166 'pay':9,23,59 'pay-per-cal':58 'pay-per-call API' 'pay-per-request' 'payment':40,119,141 'per':11,25,60,83 'platform':52,78,153,192 'point':216 'post':114 'post-method' 'premium':34 'premium API access' 'price':80,203,215 'prompt':176 'protocol':41 'provid':33 'provis':102 'rate':160,206 'request':12,26,84,115 'request/response':184 'requir':117,158 'return':171 'schema':185 'second':150 'sentiment':197 'settl':85 'span':63 'specif':93 'substant':179 'summar':200 'text':199 'timeout':151 'unit':126 'unknown':190 'usdc':14,28,87,128,137 'usdc-base' 'util':73 'varieti':56 'via':37 'wallet':175 'web3':70 'x402':2,16,39,107 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"59c33711-3175-4aa8-a282-8aa2de64aaa6","listingId":"8d15a69c-d094-42b5-9e1e-428317d5b24b","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:26.530Z"}],"sources":[{"listingId":"8d15a69c-d094-42b5-9e1e-428317d5b24b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:26.530Z","lastSeenAt":"2026-04-23T08:02:07.590Z"}],"details":{"listingId":"8d15a69c-d094-42b5-9e1e-428317d5b24b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/48 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/48"},{"claim":"All endpoints on the platform are priced 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 address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/48"}],"useCases":["Programmatically obtaining API keys via a single USDC micropayment","Agent-driven access to a gated API without traditional signup or subscription","Integrating pay-per-request infrastructure into automated workflows"],"bestFor":["Developers wanting no-signup, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.314Z"},"updatedAt":"2026-04-23T08:02:07.590Z"}}