{"id":"d0a05764-e44e-47b3-8de6-e496ff91af2a","shortId":"wWeQEL","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":"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 advertises a broad catalog of pay-per-request 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/65` is listed as \"Premium API Access\" and returns a valid x402 challenge (HTTP 402) with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme to the specified payTo address. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is gated purely by per-call USDC micropayment.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoint actually returns. The name \"Premium API Access\" and the path segment `apikeys/65` suggest this endpoint may provision or return an API key, but this is speculative. Without documentation or sample responses, the actual functionality cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-call-pricing","json-response","post-method"],"categories":["api-access","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API key","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","Actual functionality of /api/v1/apikeys/65 is unknown — 'Premium API Access' is the only description","No examples or sample responses available anywhere in the crawl","The broader platform lists many endpoints but none have documented behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/65","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality of this specific endpoint is unclear — the name 'Premium API Access' and path 'apikeys/65' are the only hints. The broader site lists many endpoints but provides no docs beyond a wallet-connect 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'/api/v1/apikeys/65':93 '/docs':171 '/pricing':173 '/readme':175 '/request':13,28 '0.02':12,27,80,126 '000':113 '0x8335':118 '20':112 '2913':119 '402':107 '6':122 'Base network API' 'USDC micropayment API' 'accept':142 'access':7,22,38,99,156,210 'actual':204,236 'address':139 'advertis':56,155 'ai':69 'analyt':68 'api':6,21,37,65,98,149,209,224 'apikeys/65':215 'application/json':147 'base':9,24,88,114,121 'base-network' 'broad':58 'call':4,19,163 'cannot':238 'catalog':59 'challeng':105 'confirm':240 'connect':181 'content':187 'crypto-paid API' 'data':67 'decim':123 'document':166,196,231 'endpoint':32,49,92,141,203,218 'equal':125 'exact':133 'exampl':199 'extrem':168 'financ':72 'function':237 'gate':158 'http':106 'infrastructur':75 'json-response' 'key':150,225 'learn':71 'limit':153 'list':95 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':70 'made':129 'mani':48 'maxamountrequir':110 'may':219 'micropay':165 'name':207 'network':89 'offer':50 'one':46 'openapi':191 'page':176 'path':213 'pay':2,17,62 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':61 'payment':42,127 'payto':138 'per':3,18,63,81,162 'per-cal':161 'per-call-pricing' 'platform':54 'post':143 'post-method' 'premium':5,20,36,97,208 'premium API key' 'price':78 'prompt':183 'protocol':43 'provid':35 'provis':220 'pure':159 'rate':152 'render':178 'request':64,82,144 'request/response':194 'respons':234 'return':101,146,205,222 'sampl':233 'schema':195 'scheme':134 'segment':214 'settl':83 'span':66 'spars':169 'spec':192 'specif':91 'specifi':137 'specul':229 'suggest':216 'unit':115 'usdc':15,30,85,117,164 'usdc-micropayment' 'util':76 'valid':103 'via':10,25,39,130 'wallet':182 'web3':73 'without':230 'x402':11,26,41,104,132 'x402 API' 'x402-payment'","prices":[{"id":"3eb9cef4-a9c7-4156-a80e-ad4129e08ed1","listingId":"d0a05764-e44e-47b3-8de6-e496ff91af2a","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:34.975Z"}],"sources":[{"listingId":"d0a05764-e44e-47b3-8de6-e496ff91af2a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:34.975Z","lastSeenAt":"2026-04-23T06:31:46.056Z"}],"details":{"listingId":"d0a05764-e44e-47b3-8de6-e496ff91af2a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/65 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/65"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/65"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Acquiring API access or keys via a single USDC micropayment","Agent-driven programmatic access to paid endpoints without traditional API key signup","Demonstrating x402 payment protocol integration for per-call billing"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need instant, keyless API access paid in USDC on Base","Low-volume or one-off API calls where subscription pricing is undesirable"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","High-volume use cases where per-call pricing at $0.02 may add up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.943Z"},"updatedAt":"2026-04-23T06:31:46.056Z"}}