{"id":"8d59136b-0625-4554-94f2-1683b42919a7","shortId":"9fVVeb","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/26` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it accepts POST requests, returns application/json, and charges a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.\n\nThe platform's documentation pages (docs, pricing, README) all render only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schema for this endpoint is unknown. Without documentation on what data this endpoint returns or what parameters it accepts, usage requires experimentation or wallet-connected exploration of the site.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC pay-per-call","Base network API","micropayment API"],"warnings":["The exact functionality of /api/v1/payments/26 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, README) require wallet connection and provide no public content.","No OpenAPI spec, no request schema, and no response schema are available.","This endpoint path (/api/v1/payments/26) does not match any of the listed API categories on the homepage, so its purpose is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/26","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/payments/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what this endpoint actually does, no request/response schema, and the docs/pricing/README pages are all behind a wallet-connect gate. The label 'Premium API Access' is generic and 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'/request':13,28 '0.02':12,27,76,139 '000':134 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '20':133 '6':144 'Base network API' 'USDC pay-per-call' 'accept':123,196 'access':7,22,38,103 'actual':176 'address':150 'ai':60 'analyt':59 'api':6,21,37,88,102 'application/json':127 'base':9,24,84,135,153 'beyond':115 'call':4,19,147 'categori':56 'challeng':107,120 'charg':129 'commit':93 'confirm':121 'connect':166,203 'data':58,188 'decim':145 'detail':173 'doc':159 'document':114,157,185 'endpoint':32,49,69,97,181,190 'exact':110 'experiment':199 'explor':204 'financ':63 'function':111 'includ':57 'infrastructur':66 'json-response' 'key':89 'label':100,117 'learn':62 'limit':91 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'maximum':131 'micropayment API' 'network':85 'no-api-key' 'offer':50 'one':46 'page':158 'paramet':194 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payabl':79 'payment':42 'per':3,18,77,146 'platform':53,72,155 'post':124 'post-method' 'premium':5,20,36,101 'price':74,160 'prompt':168 'protocol':43 'provid':35 'rate':90 'readm':161 'render':163 'request':78,125 'request/response':177 'requir':94,198 'return':126,191 'schema':178 'settl':148 'sinc':141 'site':207 'span':55 'specif':96 'technic':172 'unit':136 'unknown':183 'usag':197 'usd':140 'usdc':15,30,81,138,142 'usdc-base' 'use':143 'util':67 'via':10,25,39 'wallet':167,202 'wallet-connect':201 'web3':64 'without':184 'x402':11,26,41,106,119 'x402 premium API' 'x402-payment'","prices":[{"id":"e5a1fad8-da8d-4524-8a1e-a1c1a8223b5f","listingId":"8d59136b-0625-4554-94f2-1683b42919a7","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/payments/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:02.059Z"}],"sources":[{"listingId":"8d59136b-0625-4554-94f2-1683b42919a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:02.059Z","lastSeenAt":"2026-04-23T14:01:24.079Z"}],"details":{"listingId":"8d59136b-0625-4554-94f2-1683b42919a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/26 \\\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 platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access, on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, payable to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","source_url":"https://lowpaymentfee.com/api/v1/payments/26"}],"useCases":["Accessing premium data or services with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Exploring x402 payment protocol integrations"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents that can settle USDC payments on Base automatically","Users who want keyless, commitment-free API access"],"notFor":["Users who need detailed API documentation before integrating","High-volume use cases where per-call pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.232Z"},"updatedAt":"2026-04-23T14:01:24.079Z"}}