{"id":"c59d223a-b127-4594-81a5-05fdfc3f62dd","shortId":"fGCRN7","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 resource `/api/v1/apikeys/52` 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 payment timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example request/response bodies 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 no API keys required, no rate limits, and instant access for its other endpoints, suggesting a frictionless pay-per-call model. However, the lack of documentation for this specific endpoint means the exact request body format and response structure are unknown. Use with caution until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","api-key-provisioning","post-endpoint"],"categories":["infrastructure","api-access"],"synonyms":["premium API access","x402 API key","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, API, and README pages all return only 'Connect wallet' with no content.","The exact request body format and response schema for /api/v1/apikeys/52 are unknown.","The purpose of 'apikeys/52' is ambiguous — it may provision an API key or grant access, but this is inferred from the title alone.","No OpenAPI or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/52","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/52","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, but there is no OpenAPI schema, no documentation, no example requests or responses, and the docs/pricing/README pages are all empty (just 'Connect wallet'). The purpose of this specific endpoint (apikeys/52) is unclear beyond its 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'0.02':10,24,77,130 '000':119 '0x1a2b':135 '0x8335':124 '20':118 '2913':125 '300':141 '6':128 '85f3':136 'Base network API' 'USDC micropayment API' 'accept':109 'access':36,100,188 'address':134 'advertis':178 'ai':66 'analyt':65 'api':4,18,35,62,96,160,180 'api-key':95 'api-key-provisioning' 'appear':91 'base':8,22,85,120,127 'bodi':151,214 'broader':176 'call':61,199 'caution':223 'challeng':104 'confirm':105 'connect':168 'content':174 'crawl':156 'data':64 'decim':129 'detail':146 'doc':158 'document':147,205,226 'endpoint':6,20,30,47,101,192,209 'exact':115,212 'exampl':149 'financ':69 'format':215 'found':153 'frictionless':195 'gate':3,17 'host':54 'howev':201 'infrastructur':72 'instant':187 'key':5,19,97,181 'lack':203 'learn':68 'limit':185 'live':108 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':67 'mani':46 'mean':210 'model':200 'network':86 'offer':48 'one':44 'openapi':144 'page':163 'pay':9,23,59,197 'pay-per-cal':58,196 'pay-per-call' 'pay-per-call API' 'paye':133 'payment':40,116,138 'per':13,27,60,78,198 'platform':52,177 'post':110 'post-endpoint' 'premium':34 'premium API access' 'price':75,159 'prompt':170 'protocol':41 'provid':33 'provis':98 'rate':184 'readm':162 'request':14,28,79,111,213 'request/response':150 'requir':113,182 'resourc':89 'respons':217 'return':165 'schema':145 'second':142 'settl':80 'span':63 'specif':88,208 'structur':218 'substant':173 'suggest':193 'surfac':227 'timeout':139 'unit':121 'unknown':220 'usdc':12,26,82,123 'usdc-base' 'use':221 'util':73 'varieti':56 'via':37 'wallet':169 'web3':70 'x402':2,16,39,103 'x402 API key' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"628ae1b5-bfb0-4f6e-b6e2-f4fa71090e14","listingId":"c59d223a-b127-4594-81a5-05fdfc3f62dd","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:28.376Z"}],"sources":[{"listingId":"c59d223a-b127-4594-81a5-05fdfc3f62dd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:28.376Z","lastSeenAt":"2026-04-23T08:02:07.658Z"}],"details":{"listingId":"c59d223a-b127-4594-81a5-05fdfc3f62dd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/52 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/52"},{"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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/52"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatically obtaining or activating an API key via a single micropayment","Agent-driven access provisioning without traditional signup flows","Paying for API access on-chain using USDC on Base"],"bestFor":["Agents or services that need to acquire API keys without manual registration","Developers experimenting with x402 pay-per-call patterns","On-chain payment workflows requiring low-cost USDC transactions on Base"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume batch operations where per-call pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.217Z"},"updatedAt":"2026-04-23T08:02:07.658Z"}}