{"id":"6182a15a-8264-4c5b-846b-a0c95f26a666","shortId":"xYrTPY","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 are priced at $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/345` is listed under the title \"Premium API Access\" but the crawl material does not clarify what data or functionality this particular path returns — it is not among the named endpoints on the landing page (analytics, AI, finance, or utils). The x402 challenge confirms the endpoint is live, accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) on Base, and returns `application/json`. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.\n\nDocumentation is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. Prospective callers should be aware that the exact input parameters and response format for this endpoint are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API","crypto-paid API"],"warnings":["The exact functionality of /api/v1/payments/345 is not documented — it does not appear in the provider's listed API catalog.","All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, request schema, or response schema is available.","Input parameters for this endpoint are completely unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/345","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/345","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, but there is no documentation, no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/payments/345 is not described anywhere in the crawl. Effectively a stub 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'/api/v1/payments/345':100 '/docs':184 '/pricing':186 '/readme':188 '/request':13,28 '0.02':12,27,76,162 '000':156 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':178 '20':155 '6':166 'Base network API' 'USDC micropayment endpoint' 'accept':148 'access':7,22,38,108 'address':177 'ai':60,136 'among':127 'analyt':59,135 'api':6,21,37,88,107 'application/json':172 'avail':213 'awar':221 'base':9,24,84,157,169 'call':4,19 'caller':218 'categori':56 'challeng':142 'charg':151 'clarifi':115 'commit':95 'confirm':143 'connect':194 'content':200 'crawl':111,216 'crypto-paid API' 'data':58,117 'decim':167 'document':179 'endpoint':32,49,69,99,130,145,232 'exact':224 'exampl':212 'extrem':181 'financ':63,137 'format':229 'function':119 'given':163 'i.e':161 'includ':57 'infrastructur':66 'input':225 'json-response' 'key':89 'land':133 'learn':62 'limit':92 'list':102 'live':147 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'made':175 'mani':48 'materi':112 'maximum':153 'name':129 'network':85 'no-api-key' 'offer':50 'one':46 'openapi':204 'page':134,189 'paramet':226 'particular':121 'path':122 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,173 'per':3,18,77 'platform':72 'post':149 'post-method' 'premium':5,20,36,106 'premium API' 'price':74 'prompt':196 'prospect':217 'protocol':43 'provid':35,53 'rate':91 'render':191 'request':78,150 'request/response':207 'requir':96 'respons':228 'return':123,171 'schema':208 'settl':79 'span':55 'spec':205 'specif':98 'thin':182 'titl':105 'undocu':234 'unit':158 'usag':211 'usdc':15,30,81,160,164 'usdc-base' 'util':67,139 'via':10,25,39 'wallet':195 'web3':64 'x402':11,26,41,141 'x402 API' 'x402-payment'","prices":[{"id":"8becfd5a-6828-49d6-80a4-c8929805b672","listingId":"6182a15a-8264-4c5b-846b-a0c95f26a666","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/345","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:26.522Z"}],"sources":[{"listingId":"6182a15a-8264-4c5b-846b-a0c95f26a666","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/345","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:26.522Z","lastSeenAt":"2026-04-23T11:03:34.896Z"}],"details":{"listingId":"6182a15a-8264-4c5b-846b-a0c95f26a666","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/345 \\\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 HTTP 402 with x402 challenge, confirming it is live on Base with USDC","source_url":"https://lowpaymentfee.com/api/v1/payments/345"},{"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 address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base; maxAmountRequired 20000 base units = $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/345"},{"claim":"Provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents that can settle USDC payments on Base autonomously","Use cases requiring no-signup, no-rate-limit API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.148Z"},"updatedAt":"2026-04-23T11:03:34.896Z"}}