{"id":"9bab7dbc-1c85-4e1d-884f-42fccb05563b","shortId":"VyXRqu","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 offers 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 with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/apikeys/14` is described as \"Premium API Access\" in the x402 challenge. Its maxAmountRequired is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme: callers include an X-PAYMENT header with a signed payment authorization, and the endpoint returns an application/json response. The challenge specifies a 300-second timeout window.\n\nDocumentation on the site is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns 402 with a valid x402 challenge on POST), but without documentation it is unclear what request body this particular endpoint expects or what the response payload contains. The name \"apikeys/14\" suggests it may provision or return an API key resource, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","api-key-provisioning"],"categories":["infrastructure","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API access","Base network API","lowpaymentfee","premium API key"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found for any endpoint.","The purpose of /api/v1/apikeys/14 is unclear — the name suggests API key provisioning but this is unconfirmed.","No example request or response payloads are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/14","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages are empty stubs. The purpose of this specific endpoint (/api/v1/apikeys/14) is ambiguous. Effectively a stub 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'/api/v1/apikeys/14':116 '/docs':191 '/pricing':193 '/readme':195 '0.02':9,22,92,142 '000':131 '0x8335':136 '20':130 '2913':137 '300':179 '402':229 '6':146 'Base network API' 'USDC API access' 'access':3,16,34,122 'ai':61 'analysi':65 'analyt':55 'api':2,15,33,52,104,121,266 'api-key-provisioning' 'apikeys/14':258 'application/json':173 'author':167 'avail':222 'base':8,21,100,132,139 'bodi':245 'broad':45 'call':51 'caller':156 'catalog':46 'challeng':126,176,234 'classif':68 'commit':112 'confirm':226 'connect':201 'contain':255 'convers':85 'data':54,58 'decim':147 'describ':118 'detail':208 'document':183,217,239 'embed':69 'endpoint':28,88,115,170,224,248 'equal':141 'estim':79 'exact':154 'exampl':220 'exchang':74 'expect':249 'export':59 'extrem':188 'feed':73 'financ':70 'gas':78 'gate':35 'generat':86 'geocod':83 'given':143 'header':162 'includ':157 'infrastructur':81 'insight':60 'key':105,267 'learn':63 'limit':108 'live':227 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':62 'made':150 'maxamountrequir':128 'may':261 'metric':56 'micropay':6,19 'micropayment' 'micropayment API' 'minimum':111 'name':257 'network':101 'offer':43 'openapi':212 'page':196 'particular':247 'pay':49 'pay-per-cal':48 'pay-per-call' 'pay-per-request' 'payload':221,254 'payment':39,148,161,166 'per':10,23,50,93 'post':236 'premium':1,14,32,120 'premium API key' 'price':72,90 'prompt':203 'protocol':40 'provid':31 'provis':262 'quot':77 'rate':75,107 'render':198 'report':57 'request':11,24,94,244 'request/response':215 'resourc':268 'respons':174,253 'return':171,228,264 'schema':216 'scheme':155 'second':180 'sentiment':64 'settl':95 'sign':165 'site':42,186 'span':53 'spars':189 'spec':213 'specif':114 'specifi':177 'specul':272 'suggest':259 'summar':67 'technic':207 'text':66 'timeout':181 'token':76 'unclear':242 'unit':133 'usdc':13,26,97,135,144 'usdc-base' 'util':82 'valid':84,232 'via':4,17,151 'wallet':202 'web3':71 'window':182 'without':238 'x':160 'x-payment':159 'x402':5,18,38,125,153,233 'x402 API' 'x402-payment'","prices":[{"id":"dbdc5d03-94e3-4546-9074-dbd9a18e8a08","listingId":"9bab7dbc-1c85-4e1d-884f-42fccb05563b","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:29.608Z"}],"sources":[{"listingId":"9bab7dbc-1c85-4e1d-884f-42fccb05563b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:29.608Z","lastSeenAt":"2026-04-22T12:04:51.749Z"}],"details":{"listingId":"9bab7dbc-1c85-4e1d-884f-42fccb05563b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/14 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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 x402 challenge specifies maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/apikeys/14"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic purchase of API access keys via cryptocurrency micropayment","Agent-driven API consumption without pre-registration or API key management","On-demand access to data, AI, finance, or utility endpoints at $0.02/call"],"bestFor":["AI agents needing keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments for occasional API calls","Crypto-native applications settling microtransactions on Base L2"],"notFor":["High-volume use cases where per-request pricing becomes expensive compared to subscriptions","Users who need detailed API documentation or SLAs before integrating","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.183Z"},"updatedAt":"2026-04-22T12:04:51.749Z"}}