{"id":"876ba41b-a969-4c11-a9e6-0ccc5a775397","shortId":"prGKpP","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 operates a broad catalog of pay-per-call API endpoints spanning data & analytics, AI/ML inference (sentiment analysis, 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/92` is listed as \"Premium API Access\" and accepts POST requests. Payment is handled inline via the x402 protocol: the server returns a 402 challenge with an `accepts` block specifying USDC (contract 0x8335…2913 on Base) with a maxAmountRequired of 20000 base units (i.e., $0.02 given USDC's 6 decimals). No traditional API keys or rate limits are advertised — access is granted per-request upon valid payment.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples. The exact functionality behind the `/api/v1/apikeys/92` path is unclear — it may generate or retrieve API keys, but this is not documented. Prospective users should test the endpoint directly to understand its behavior.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","api-key-management"],"categories":["infrastructure","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API key","crypto-gated API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The exact functionality of /api/v1/apikeys/92 is undocumented — 'Premium API Access' is vague","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/92","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/92","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 402 challenge, confirming it is operational. However, documentation is essentially nonexistent — every doc/pricing/API page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific /api/v1/apikeys/92 path is unclear beyond its 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'0.02':9,22,86,143 '0x8335':131 '20000':139 '2913':132 '402':122 '6':147 'Base network API' 'USDC micropayment endpoint' 'accept':107,126 'access':3,16,34,105,158 'addit':187 'advertis':157 'ai/ml':57 'analysi':60 'analyt':56 'api':2,15,33,52,104,151,173,216 'api-key-management' 'base':8,21,94,134,140 'behavior':233 'behind':205 'block':127 'broad':45 'call':51 'catalog':46 'challeng':123 'classif':62 'connect':182 'contract':130 'convers':79 'crypto-gated API' 'data':55 'decim':148 'detail':189 'direct':229 'doc':172 'document':167,222 'embed':63 'endpoint':28,53,82,98,228 'estim':73 'exact':203 'exampl':201 'exchang':68 'extrem':169 'feed':67 'financ':64 'function':204 'gas':72 'gate':35 'generat':80,213 'geocod':77 'given':144 'grant':160 'handl':112 'i.e':142 'infer':58 'infrastructur':75 'inlin':113 'key':152,217 'limit':155 'list':101 'lowpaymentfee' 'lowpaymentfee.com':30 'maxamountrequir':137 'may':212 'micropay':6,19 'micropayment' 'network':95 'openapi':193 'oper':43 'page':177 'path':208 'pay':49 'pay-per-cal':48 'pay-per-call API' 'pay-per-request' 'payment':39,110,166 'per':10,23,50,87,162 'per-request':161 'post':108 'premium':1,14,32,103 'premium API key' 'price':66,84,174 'prompt':184 'prospect':223 'protocol':40,117 'provid':31,42 'quot':71 'rate':69,154 'readm':176 'render':179 'request':11,24,88,109,163 'request/response':196 'retriev':215 'return':120 'schema':197 'sentiment':59 'server':119 'settl':89 'span':54 'spars':170 'spec':194 'specif':97 'specifi':128 'summar':61 'technic':188 'test':226 'token':70 'tradit':150 'unclear':210 'understand':231 'unit':141 'upon':164 'usag':200 'usdc':13,26,91,129,145 'usdc-base' 'user':224 'util':76 'valid':78,165 'via':4,17,114 'wallet':183 'web3':65 'x402':5,18,38,116 'x402 API' 'x402-payment'","prices":[{"id":"cc8c9e17-2a67-468f-bff9-b75565262e46","listingId":"876ba41b-a969-4c11-a9e6-0ccc5a775397","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/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:38.567Z"}],"sources":[{"listingId":"876ba41b-a969-4c11-a9e6-0ccc5a775397","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:38.567Z","lastSeenAt":"2026-04-23T05:01:54.870Z"}],"details":{"listingId":"876ba41b-a969-4c11-a9e6-0ccc5a775397","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/92 \\\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":"Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/92"},{"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":"Provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/92"}],"useCases":["Acquiring API keys or premium access tokens via a single micropayment","Programmatic pay-per-use access without traditional subscription or signup","Agent-driven API consumption where payment is settled on-chain per call"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer on-chain USDC micropayments over credit card billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.741Z"},"updatedAt":"2026-04-23T05:01:54.870Z"}}