{"id":"8383b538-5be4-4389-abb0-fd6fb3d931a0","shortId":"E62cMS","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated by the x402 payment protocol. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/86` is described as \"Premium API Access\" and returns a live x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — callers attach an X-PAYMENT header with a signed payment to the payTo address. There are no API keys, no rate limits, and no minimum commitments advertised.\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 this particular endpoint returns. The endpoint name suggests it may provision or return API keys, but this is speculative. Prospective callers should be aware that the actual functionality behind this endpoint is undocumented beyond its title.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","api-key-provisioning"],"categories":["infrastructure","api-access"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API key","crypto API access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found for this endpoint.","The actual response payload and functionality of /api/v1/apikeys/86 are unknown; the name suggests API key provisioning but this is unverified.","No request body schema documented — callers have no guidance on what to POST."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/86","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/86","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 ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a title, and no examples. The actual functionality of this specific endpoint is unclear — it may provision API keys but this is 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'/api/v1/apikeys/86':105 '/docs':176 '/pricing':178 '/readme':180 '0.02':9,22,92,134 '000':123 '0x8335':128 '20':122 '2913':129 'Base network API' 'USDC micropayment API' 'access':3,16,34,111 'actual':233 'address':157 'advertis':170 'ai':61 'analysi':65 'analyt':55 'api':2,15,33,52,110,161,220 'api-key-provisioning' 'attach':144 'awar':230 'base':8,21,100,124,131 'behind':235 'beyond':240 'broad':45 'call':51 'caller':143,227 'catalog':46 'challeng':117 'classif':68 'commit':169 'connect':186 'content':192 'convers':85 'crypto API access' 'data':54,58 'describ':107 'document':171,201 'embed':69 'endpoint':28,88,104,209,212,237 'equal':133 'estim':79 'exact':141 'exampl':204 'exchang':74 'export':59 'extrem':173 'feed':73 'financ':70 'function':234 'gas':78 'gate':35 'generat':86 'geocod':83 'header':149 'host':43 'infrastructur':81 'insight':60 'key':162,221 'learn':63 'limit':165 'live':115 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':62 'made':137 'maxamountrequir':120 'may':216 'metric':56 'micropay':6,19 'micropayment' 'minimum':168 'name':213 'network':101 'openapi':196 'page':181 'particular':208 'pay':49 'pay-per-cal':48 'pay-per-call API' 'pay-per-request' 'payment':39,135,148,153 'payto':156 'per':10,23,50,93 'premium':1,14,32,109 'premium API key' 'price':72,90 'prompt':188 'prospect':226 'protocol':40 'provid':31 'provis':217 'quot':77 'rate':75,164 'render':183 'report':57 'request':11,24,94 'request/response':199 'return':113,210,219 'schema':200 'scheme':142 'sentiment':64 'settl':95 'sign':152 'site':42 'span':53 'spars':174 'spec':197 'specif':103 'specul':225 'suggest':214 'summar':67 'text':66 'titl':242 'token':76 'undocu':239 'unit':125 'usdc':13,26,97,127 'usdc-base' 'util':82 'valid':84 'via':4,17,138 'wallet':187 'web3':71 'x':147 'x-payment':146 'x402':5,18,38,116,140 'x402 API' 'x402-payment'","prices":[{"id":"d89649c0-101f-42ab-8089-65630e18b5fd","listingId":"8383b538-5be4-4389-abb0-fd6fb3d931a0","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/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:34.390Z"}],"sources":[{"listingId":"8383b538-5be4-4389-abb0-fd6fb3d931a0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:34.390Z","lastSeenAt":"2026-04-23T06:31:46.046Z"}],"details":{"listingId":"8383b538-5be4-4389-abb0-fd6fb3d931a0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/86 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/86"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, making 20000 base units = $0.02","source_url":"https://lowpaymentfee.com/api/v1/apikeys/86"}],"useCases":["Programmatic acquisition of API keys via micropayment","Agent-driven access to premium API services without traditional subscriptions","Pay-per-use API access settled on Base L2 in USDC"],"bestFor":["Agents or bots that need instant, keyless API access via crypto micropayments","Developers who want to avoid subscription commitments for occasional API calls","Web3-native applications that settle payments on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.922Z"},"updatedAt":"2026-04-23T06:31:46.046Z"}}