{"id":"56429060-8d4d-4812-b821-6f82a31fe1af","shortId":"M8sxw9","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 collection 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/80` is labeled \"Premium API Access\" in the x402 challenge. The probe confirms it is live, returning a 402 challenge with a maxAmountRequired of 20,000 base units of USDC (USD Coin, 6 decimals), which equals $0.02. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact payment scheme. The endpoint accepts POST requests and returns `application/json`.\n\nHowever, the actual functionality behind this specific endpoint path (`/payments/80`) is unclear. The site's landing page lists numerous categorized APIs (analytics, AI, finance, utilities) but does not specifically document a `/payments/80` route. No OpenAPI spec, detailed docs, or example request/response payloads were found in the crawl — the docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. As a result, the precise input parameters and response format for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay per call api","micropayment api","USDC api access","base network api","premium api"],"warnings":["The specific functionality of /api/v1/payments/80 is not documented anywhere on the site","No OpenAPI spec or schema available for request/response formats","All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no content","The endpoint path '/payments/80' does not appear in the site's listed API catalog, making its purpose unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/80","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/80","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 example requests or responses, and the specific functionality of /api/v1/payments/80 is undocumented. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/payments/80':170,192 '/request':13,28 '0.02':12,27,81,141 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '20':129 '402':123 '6':137 'USDC api access' 'accept':155 'access':7,22,38,110 'actual':163 'address':146 'ai':68,183 'analyt':67,182 'api':6,21,37,64,93,109,181,210 'application/json':160 'base':9,24,89,131 'base network api' 'base-network' 'behind':165 'call':4,19 'categor':180 'challeng':114,124 'coin':136 'collect':58 'commit':100 'confirm':117 'connect':219 'content':225 'crawl':207 'data':66 'decim':138 'detail':197 'doc':198,209 'document':190 'endpoint':32,49,77,104,154,168,238 'equal':140 'exact':150 'exampl':200 'financ':71,184 'format':235 'found':204 'function':164 'host':56 'howev':161 'infrastructur':74 'input':231 'json-response' 'key':94 'label':107 'land':176 'learn':70 'limit':97 'list':178 'live':120 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':144 'mani':48 'maxamountrequir':127 'micropayment api' 'network':90 'no-api-key' 'numer':179 'offer':50 'one':46 'openapi':195 'page':177,214 'paramet':232 'path':169 'pay':2,17,61 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':60 'payload':202 'payment':42,142,151 'per':3,18,62,82 'platform':54 'post':156 'precis':230 'premium':5,20,36,108 'premium api' 'price':79,211 'probe':116 'prompt':221 'protocol':43 'provid':35 'rate':96 'readm':213 'remain':239 'render':216 'request':63,83,157 'request/response':201 'requir':101 'respons':234 'result':228 'return':121,159 'rout':193 'scheme':152 'settl':84 'site':174 'span':65 'spec':196 'specif':103,167,189 'substant':224 'unclear':172 'unit':132 'unknown':240 'usd':135 'usdc':15,30,86,134 'usdc-settlement' 'use':148 'util':75,185 'via':10,25,39 'wallet':220 'web3':72 'x402':11,26,41,113 'x402 api' 'x402-payment'","prices":[{"id":"da9f936e-5783-40eb-86e9-36f6e0df9468","listingId":"56429060-8d4d-4812-b821-6f82a31fe1af","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:53.216Z"}],"sources":[{"listingId":"56429060-8d4d-4812-b821-6f82a31fe1af","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:53.216Z","lastSeenAt":"2026-04-23T09:31:18.181Z"}],"details":{"listingId":"56429060-8d4d-4812-b821-6f82a31fe1af","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/80 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/80"},{"claim":"All endpoints are priced at $0.02 per 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":["Agent-initiated pay-per-call API access without pre-registration or API keys","Programmatic access to premium data or services settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402 protocol experimentation with minimal cost ($0.02/call)","Crypto-native workflows that settle payments on Base L2"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Use cases requiring known, well-documented input/output schemas","Anyone without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.792Z"},"updatedAt":"2026-04-23T09:31:18.181Z"}}