{"id":"dd671ea2-6e3d-46fb-9d0e-cf404feb7f19","shortId":"4eMk9v","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, 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/68` is listed 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 signup required; access is purely payment-gated.\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 schema, no request/response examples, and no detailed description of what this particular endpoint returns. The endpoint path suggests it may generate or manage API keys, but this is speculative. Callers should test with a small payment to discover the actual response format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","micropayment"],"categories":["api-access","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API key","crypto-paid API"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of /api/v1/apikeys/68 is unclear; 'Premium API Access' is a generic label","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/68","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/68","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, confirming it accepts USDC payments on Base at $0.02. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. The purpose of this specific endpoint (/api/v1/apikeys/68) is unclear — it may generate API keys or provide some other premium access, but this is unverifiable from available 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'0.02':9,22,87,129 '000':118 '0x8335':123 '20':117 '2913':124 'Base network API' 'USDC micropayment API' 'access':3,16,34,106,165 'actual':236 'address':152 'ai/ml':57 'analysi':60 'analyt':56 'api':2,15,33,52,105,156,177,220 'attach':139 'base':8,21,95,119,126 'broad':45 'call':51 'caller':138,226 'catalog':46 'challeng':112 'classif':63 'connect':186 'content':192 'convers':80 'crypto-paid API' 'data':55 'descript':204 'detail':203 'discov':234 'doc':176 'document':171 'embed':64 'endpoint':28,53,83,99,209,212 'equal':128 'estim':74 'exact':136 'exampl':200 'exchang':69 'extrem':173 'feed':68 'financ':65 'format':238 'gas':73 'gate':35,170 'generat':81,217 'geocod':78 'header':144 'infer':58 'infrastructur':76 'key':157,221 'limit':160 'list':102 'live':110 'lowpaymentfee' 'lowpaymentfee.com':30 'made':132 'manag':219 'maxamountrequir':115 'may':216 'micropay':6,19 'micropayment' 'network':96 'no-api-key' 'no-rate-limit' 'openapi':196 'oper':43 'page':181 'particular':208 'path':213 'pay':49 'pay-per-cal':48 'pay-per-call API' 'pay-per-request' 'payment':39,130,143,148,169,232 'payment-g':168 'payto':151 'per':10,23,50,88 'premium':1,14,32,104 'premium API key' 'price':67,85,178 'prompt':188 'protocol':40 'provid':31,42 'pure':167 'quot':72 'rate':70,159 'readm':180 'render':183 'request':11,24,89 'request/response':199 'requir':164 'respons':237 'return':108,210 'schema':197 'scheme':137 'sentiment':59 'settl':90 'sign':147 'signup':163 'small':231 'span':54 'spars':174 'specif':98 'specul':225 'suggest':214 'summar':62 'test':228 'text':61 'token':71 'unit':120 'usdc':13,26,92,122 'usdc-base' 'util':77 'valid':79 'via':4,17,133 'wallet':187 'web3':66 'x':142 'x-payment':141 'x402':5,18,38,111,135 'x402 API' 'x402-payment'","prices":[{"id":"02a570d4-f697-4795-b4f6-5b500c92e6cc","listingId":"dd671ea2-6e3d-46fb-9d0e-cf404feb7f19","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:32.572Z"}],"sources":[{"listingId":"dd671ea2-6e3d-46fb-9d0e-cf404feb7f19","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:32.572Z","lastSeenAt":"2026-04-23T06:31:45.984Z"}],"details":{"listingId":"dd671ea2-6e3d-46fb-9d0e-cf404feb7f19","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/68 \\\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":"Endpoint returns a live x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/68"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/68"},{"claim":"Provider offers endpoints across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API key management","Programmatic access to premium endpoints with per-call USDC micropayments on Base","Wallet-authenticated services where traditional billing is impractical"],"bestFor":["AI agents with Base USDC wallets needing frictionless API access","Developers who want pay-as-you-go pricing with no commitments","x402-compatible clients looking for low-cost per-request endpoints"],"notFor":["Users without a Base-compatible USDC wallet","High-volume callers who need bulk pricing or subscription discounts","Anyone needing detailed documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.981Z"},"updatedAt":"2026-04-23T06:31:45.984Z"}}