{"id":"3a167646-b278-4558-94f8-afe79a1b7529","shortId":"32DCGe","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 lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints 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/352` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base (asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). Payment is made via the `exact` scheme with a 300-second timeout. The response MIME type is `application/json`.\n\nHowever, the exact functionality behind this particular endpoint path (`/payments/352`) is unclear. The landing page lists many specific APIs (sentiment analysis, geocoding, price feeds, etc.) but does not describe a `/payments/352` route. There is no OpenAPI spec, no detailed documentation, and the docs/pricing/API pages all render only a \"Connect wallet\" prompt with no further content. Without more information, it is impossible to determine what data or service this specific endpoint returns beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay per call API","USDC API access","Base network API","micropayment API"],"warnings":["No OpenAPI or schema documentation available — docs pages render only 'Connect wallet'","The exact functionality of /api/v1/payments/352 is undocumented; 'Premium API Access' is vague","The landing page lists many endpoints but /payments/352 is not among them, raising questions about what it returns","No example request or response bodies are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/352","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/352","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 OpenAPI spec, no documentation beyond a wallet-connect prompt, and no clarity on what this specific endpoint actually does. The generic label \"Premium API Access\" and the opaque /payments/352 path provide insufficient information for confident 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'/payments/352':172,193 '/request':13,28 '0.02':12,27,81,133 '000':128 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':144 '20':127 '300':154 '6':138 'Base network API' 'USDC API access' 'accept':113 'access':7,22,38,111,239 'ai':68 'analysi':183 'analyt':67 'api':6,21,37,64,93,110,181,238 'application/json':162 'asset':142 'base':9,24,89,129,141 'behind':167 'beyond':234 'call':4,19 'catalog':58 'challeng':118 'commit':100 'confirm':119 'connect':211 'content':217 'contract':143 'data':66,227 'decim':139 'describ':191 'detail':201 'determin':225 'docs/pricing/api':205 'document':202 'endpoint':32,49,77,104,170,232 'etc':187 'exact':150,165 'feed':186 'financ':71 'function':166 'generic':236 'geocod':184 'host':56 'howev':163 'imposs':223 'inform':220 'infrastructur':74 'json-response' 'key':94 'label':240 'land':176 'learn':70 'limit':97 'list':107,178 'live':122 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':147 'mani':48,179 'maximum':125 'micropayment API' 'mime':159 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':198 'page':177,206 'particular':169 'path':171 'pay':2,17,61 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':60 'payment':42,145 'per':3,18,62,82 'platform':54 'post':114 'post-method' 'premium':5,20,36,109,237 'price':79,185 'prompt':213 'protocol':43 'provid':35 'rate':96 'render':208 'request':63,83,115,123 'requir':101 'respons':158 'return':233 'rout':194 'scheme':151 'second':155 'sentiment':182 'servic':229 'settl':84 'sinc':135 'span':65 'spec':199 'specif':103,180,231 'timeout':156 'type':160 'unclear':174 'unit':130 'usd':134 'usdc':15,30,86,132,136 'usdc-base' 'use':137 'util':75 'via':10,25,39,148 'wallet':212 'web3':72 'without':218 'x402':11,26,41,117 'x402 API' 'x402-payment'","prices":[{"id":"f0a39fd7-1fad-4682-b4e3-5d8afc17b0d1","listingId":"3a167646-b278-4558-94f8-afe79a1b7529","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/352","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:28.370Z"}],"sources":[{"listingId":"3a167646-b278-4558-94f8-afe79a1b7529","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/352","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:28.370Z","lastSeenAt":"2026-04-22T07:01:10.710Z"}],"details":{"listingId":"3a167646-b278-4558-94f8-afe79a1b7529","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/352 \\\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 endpoint returns a 402 x402 challenge requesting 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/payments/352"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol with minimal cost","AI agents that need keyless, pay-per-use API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.016Z"},"updatedAt":"2026-04-22T07:01:10.710Z"}}