{"id":"0b24eb30-4425-475c-8b10-b67b26a980d8","shortId":"P3kCSc","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 provider, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/53` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD) on Base (asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The payment is made via the `exact` scheme with a 300-second timeout.\n\nThe provider's landing page lists 16 endpoints across four categories but documentation pages (docs, pricing, README) all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual behavior behind this particular endpoint path (`/payments/53`) is unclear — it may be a demo or placeholder. Agents should be aware that without documented input/output schemas, integration requires experimentation or direct contact with the provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","Base network api","crypto-paid api"],"warnings":["No documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for this endpoint","The purpose of /api/v1/payments/53 ('Premium API Access') is not explained anywhere","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/53","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what 'Premium API Access' at /payments/53 actually does. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/payments/53':216 '/request':13,28 '0.02':12,27,79,144 '000':139 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':150 '16':170 '20':138 '300':161 'Base network api' 'USDC micropayment api' 'accept':128 'access':7,22,38,109 'across':172 'actual':209 'agent':226 'ai':60 'analyt':59 'api':6,21,37,91,108 'asset':148 'avail':207 'awar':229 'base':9,24,87,140,147 'behavior':210 'behind':211 'beyond':117 'call':4,19 'categori':56,174 'challeng':122 'commit':98 'confirm':123 'connect':186 'contact':240 'contract':149 'crypto-paid api' 'data':58 'demo':223 'detail':193 'direct':239 'doc':178 'document':116,176,202,232 'endpoint':32,49,69,102,125,171,214 'exact':112,157 'exampl':206 'experiment':237 'financ':63 'four':173 'function':113 'includ':57 'infrastructur':66 'input/output':233 'integr':235 'json-response' 'key':92 'label':119 'land':167 'learn':62 'limit':95 'list':105,169 'live':127 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'made':154 'mani':48 'may':220 'minim':185 'model':77 'network':88 'no-api-key' 'offer':50 'one':46 'openapi':197 'page':168,177 'particular':213 'path':215 'pay':2,17 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request' 'payment':42,134,152 'per':3,18,80 'placehold':225 'platform':72 'post':129 'post-endpoint' 'premium':5,20,36,107 'price':76,179 'prompt':188 'protocol':43 'provid':35,53,165,243 'rate':94 'readm':180 'request':81,130 'request/response':200 'requir':99,132,236 'resolv':182 'schema':201,234 'scheme':158 'second':162 'settl':82 'share':73 'span':55 'spec':198 'specif':101 'technic':192 'timeout':163 'unclear':218 'uniform':75 'unit':141 'usag':205 'usd':145 'usdc':15,30,84,143 'usdc-base' 'util':67 'via':10,25,39,155 'wallet':187 'web3':64 'without':231 'x402':11,26,41,121 'x402 api' 'x402-payment'","prices":[{"id":"93834cd8-5c03-42cc-8c61-790a46936f31","listingId":"0b24eb30-4425-475c-8b10-b67b26a980d8","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:50.149Z"}],"sources":[{"listingId":"0b24eb30-4425-475c-8b10-b67b26a980d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:50.149Z","lastSeenAt":"2026-04-23T09:31:18.014Z"}],"details":{"listingId":"0b24eb30-4425-475c-8b10-b67b26a980d8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/53 \\\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 requiring up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/53"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/53"},{"claim":"Provider offers 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents needing keyless, pay-per-call API access on Base","Low-volume consumers who prefer no subscription commitments"],"notFor":["Users needing well-documented API schemas and response formats","High-volume production workloads requiring SLAs or guaranteed uptime","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.928Z"},"updatedAt":"2026-04-23T09:31:18.014Z"}}