{"id":"b019d686-6e57-4dde-b80d-2f7de0c310d6","shortId":"dHw532","kind":"x402","title":"Premium API access via x402 micropayment on Base network, $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base network, $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated by the x402 payment protocol. It is part of a broader platform offering multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request paid in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/18` accepts POST requests and returns JSON. Payment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). The x402 challenge advertises a maxAmountRequired of 20000 base units, which equals $0.02 given USDC's 6 decimals. There are no API keys required, no rate limits advertised, and access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. The exact functionality behind this particular endpoint (apikeys/18) is unclear beyond the generic \"Premium API Access\" label. The platform appears to be a demonstration or early-stage x402-enabled API marketplace.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-micropayment","json-response","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The exact functionality of /api/v1/apikeys/18 is unclear; 'Premium API Access' is a generic label","No request or response schema provided","Platform may be early-stage or a demo"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/18","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the actual functionality of this specific endpoint is undefined beyond a generic label. The site's docs pages are 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'0.02':10,24,68,112 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':97 '20000':107 '6':116 'Base network API' 'USDC API access' 'accept':82 'access':3,17,36,129,183 'addit':165 'advertis':103,127 'ai':57 'analyt':56 'api':2,16,35,52,121,151,182,199 'apikeys/18':175 'appear':187 'base':8,22,76,99,108 'behind':171 'beyond':178 'broader':48 'categori':53 'chain':93 'challeng':102 'connect':160 'contract':96 'data':55 'decim':117 'demonstr':191 'detail':167 'doc':150 'document':142 'earli':194 'early-stag':193 'enabl':198 'endpoint':30,80,174 'equal':111 'exact':169 'extrem':147 'financ':60 'function':170 'gate':37 'generic':180 'given':113 'header':141 'includ':54,135 'infrastructur':63 'instant':131 'json':87 'json-response' 'key':122 'label':184 'learn':59 'limit':126 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':58 'marketplac':200 'maxamountrequir':105 'micropay':6,20 'micropayment API' 'multipl':51 'network':9,23,77 'offer':50 'on-chain':91 'page':155 'paid':71 'part':45 'particular':173 'pay-per-call API' 'payment':41,88,133,140 'per':11,25,69 'per-request-micropayment' 'platform':49,186 'post':83 'post-method' 'premium':1,15,34,181 'price':66,152 'prompt':162 'protocol':42 'provid':33 'rate':125 'readm':154 'render':157 'request':12,26,70,84 'requir':123 'return':86 'settl':90 'site':145 'spars':148 'specif':79 'stage':195 'technic':166 'unclear':177 'unit':109 'usdc':14,28,73,95,114 'usdc-base-network' 'util':64 'via':4,18,94 'wallet':161 'web3':61 'x':139 'x-payment':138 'x402':5,19,40,101,197 'x402 API' 'x402-enabled':196 'x402-payment'","prices":[{"id":"20ce1e47-0068-48d8-b78b-0064f2f4baca","listingId":"b019d686-6e57-4dde-b80d-2f7de0c310d6","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:19.834Z"}],"sources":[{"listingId":"b019d686-6e57-4dde-b80d-2f7de0c310d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:19.834Z","lastSeenAt":"2026-04-22T12:04:51.039Z"}],"details":{"listingId":"b019d686-6e57-4dde-b80d-2f7de0c310d6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/18 \\\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 402 with x402 challenge advertising maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/18"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/18"}],"useCases":["Programmatic access to premium API endpoints without subscription or API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can autonomously pay for API calls via crypto micropayments","Users who want no-signup, no-rate-limit API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring fiat-only payment methods","High-volume use cases where per-request pricing at $0.02 is cost-prohibitive"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.554Z"},"updatedAt":"2026-04-22T12:04:51.039Z"}}