{"id":"7a4e0ae5-ad6b-49fa-97c9-800fde875d77","shortId":"Z37br4","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 data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request.\n\nThe specific endpoint `/api/v1/payments/227` is labeled \"Premium API Access\" in the x402 challenge. The challenge confirms it accepts payment on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is gated purely by per-request micropayment.\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 description of what \"Premium API Access\" actually returns or what input parameters it expects. The platform's landing page lists many other endpoints (analytics, AI, finance, utilities) but does not clarify what this particular payments endpoint does. Prospective users should be aware that without documentation, the actual functionality behind this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["payments","api-gateway"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","USDC pay-per-call","Base network API","premium API endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The purpose and functionality of /api/v1/payments/227 ('Premium API Access') is not described anywhere","No OpenAPI or input/output schema provided; request parameters and response format are unknown","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/227","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/227","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and network. However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint is completely undescribed. This is effectively a stub 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'/request':13,28 '0.02':12,27,70,110 '000':106 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':99 '20':105 '6':114 'Base network API' 'USDC pay-per-call' 'accept':90,118 'access':7,22,38,81,132,178 'actual':179,219 'advertis':131 'ai':58,197 'amount':103 'analyt':57,196 'api':6,21,37,80,125,147,177 'application/json':123 'awar':214 'base':9,24,94,107 'behind':221 'call':4,19 'categori':66 'challeng':85,87 'clarifi':203 'confirm':88 'connect':156 'content':162 'contract':98 'data':56 'decim':115 'descript':173 'doc':146 'document':141,217 'endpoint':32,49,75,117,195,208,223 'exampl':170 'expect':186 'extrem':143 'financ':61,198 'function':220 'gate':134 'given':111 'i.e':109 'infrastructur':64 'input':183 'json-response' 'key':126 'label':78 'land':190 'learn':60 'limit':129 'list':192 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'mani':48,193 'max':102 'micropay':140 'network':95 'no-api-key' 'offer':50 'one':46 'openapi':166 'page':151,191 'paramet':184 'particular':206 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payment':42,91,207 'per':3,18,71,138 'per-request':137 'platform':53,188 'post':119 'post-method' 'premium':5,20,36,79,176 'premium API endpoint' 'price':68,148 'prompt':158 'prospect':210 'protocol':43 'provid':35 'pure':135 'rate':128 'readm':150 'render':153 'request':72,120,139 'request/response':169 'return':122,180 'schema':167 'span':55 'spars':144 'specif':74 'unit':108 'unknown':225 'usdc':15,30,97,112 'usdc-base-network' 'use':96 'user':211 'util':65,199 'via':10,25,39 'wallet':157 'web3':62 'without':216 'x402':11,26,41,84 'x402 micropayment API' 'x402-payment'","prices":[{"id":"6968ba63-889f-4bb7-be14-ee34d66b3a4f","listingId":"7a4e0ae5-ad6b-49fa-97c9-800fde875d77","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/227","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:53.534Z"}],"sources":[{"listingId":"7a4e0ae5-ad6b-49fa-97c9-800fde875d77","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/227","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:53.534Z","lastSeenAt":"2026-04-23T16:07:16.619Z"}],"details":{"listingId":"7a4e0ae5-ad6b-49fa-97c9-800fde875d77","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/227 \\\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 accepting USDC on Base network, maxAmountRequired 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/payments/227"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/227"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven micropayment workflows on the Base L2 network","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 micropayment protocol","Agents that need keyless, pay-per-use API access on Base","Low-cost experimentation with crypto-settled API calls"],"notFor":["Users who need documented request/response schemas before integrating","Production workloads requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.638Z"},"updatedAt":"2026-04-23T16:07:16.619Z"}}