{"id":"30bf1dde-62fd-460a-af4d-eb8cc663f50f","shortId":"7KdXES","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 provider's site advertises a broad catalog of API endpoints 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 probed (/api/v1/apikeys/85) is labeled \"Premium API Access\" and returns a valid x402 challenge 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 purely pay-per-call.\n\nDocumentation is extremely thin: 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 purpose of the /api/v1/apikeys/85 path specifically (as opposed to the other listed endpoints) is unclear — it may provision or retrieve an API key. Without documentation, the actual functionality behind this endpoint cannot be confirmed beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","json-api","post-method"],"categories":["api-access","infrastructure"],"synonyms":["x402 API","micropayment API","USDC API access","Base network API","pay-per-call API","lowpaymentfee","premium API key"],"warnings":["No documentation available — /docs, /pricing, /README all render only 'Connect wallet' with no content","No OpenAPI or schema specification found","The purpose of /api/v1/apikeys/85 is unclear — it may provision API keys or serve some other function","No request or response examples available anywhere in crawled content","The broader site lists many endpoints but none have documented schemas or usage instructions"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/85","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/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and pricing is clear ($0.02 USDC on Base). However, there is zero documentation on request parameters, response format, or what the endpoint actually does. The /docs, /pricing, and /README pages are empty beyond a wallet connect prompt. No OpenAPI spec or examples are available. The specific purpose of /api/v1/apikeys/85 is 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'/api/v1/apikeys/85':105,216 '/docs':177 '/pricing':179 '/readme':181 '0.02':9,22,91,135 '000':122 '0x8335':127 '20':121 '2913':128 '6':131 'Base network API' 'USDC API access' 'accept':151 'access':3,16,34,110,165 'actual':210,239 'address':148 'advertis':45,164 'ai':60 'analysi':64 'analyt':54 'api':2,15,33,50,109,158,234 'application/json':156 'base':8,21,99,123,130 'behind':241 'beyond':247 'broad':47 'call':171 'cannot':244 'catalog':48 'challeng':116,250 'classif':67 'confirm':246 'connect':187 'content':193 'convers':84 'data':53,57 'decim':132 'document':172,202,237 'embed':68 'endpoint':28,51,87,103,150,209,225,243 'equal':134 'estim':78 'exact':142 'exampl':205 'exchang':73 'export':58 'extrem':174 'feed':72 'financ':69 'function':240 'gas':77 'gate':35 'generat':85 'geocod':82 'infrastructur':80 'insight':59 'json-api' 'key':159,235 'label':107 'learn':62 'limit':162 'list':224 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':61 'made':138 'maxamountrequir':119 'may':229 'metadata':251 'metric':55 'micropay':6,19 'micropayment' 'micropayment API' 'network':100 'openapi':197 'oppos':220 'page':182 'path':217 'pay':169 'pay-per-cal':168 'pay-per-call API' 'pay-per-request' 'payment':39,136 'payto':147 'per':10,23,92,170 'post':152 'post-method' 'premium':1,14,32,108 'premium API key' 'price':71,89 'probe':104 'prompt':189 'protocol':40 'provid':31,42 'provis':230 'pure':167 'purpos':213 'quot':76 'rate':74,161 'render':184 'report':56 'request':11,24,93,153 'request/response':200 'retriev':232 'return':112,155,211 'schema':201 'scheme':143 'sentiment':63 'settl':94 'site':44 'span':52 'spec':198 'specif':102,218 'specifi':146 'summar':66 'text':65 'thin':175 'token':75 'unclear':227 'unit':124 'usdc':13,26,96,126 'usdc-base' 'util':81 'valid':83,114 'via':4,17,139 'wallet':188 'web3':70 'without':236 'x402':5,18,38,115,141,249 'x402 API' 'x402-payment'","prices":[{"id":"378e0c65-39e4-48d8-94f1-00f8690fb3f9","listingId":"30bf1dde-62fd-460a-af4d-eb8cc663f50f","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/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:40.949Z"}],"sources":[{"listingId":"30bf1dde-62fd-460a-af4d-eb8cc663f50f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/85","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:40.949Z","lastSeenAt":"2026-04-23T05:01:54.982Z"}],"details":{"listingId":"30bf1dde-62fd-460a-af4d-eb8cc663f50f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/85 \\\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/85"},{"claim":"All listed endpoints 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 lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/apikeys/85"}],"useCases":["Programmatic pay-per-call API access without traditional API key management","Agent-driven API consumption settled in USDC on Base","Accessing premium endpoints with no subscription or rate limits"],"bestFor":["Developers or agents wanting zero-commitment, pay-per-request API access","x402-compatible clients on the Base network","Use cases requiring low-cost micropayments ($0.02/call) in USDC"],"notFor":["Users needing detailed API documentation or response schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.613Z"},"updatedAt":"2026-04-23T05:01:54.982Z"}}