{"id":"0ea2653a-239b-435d-b924-bb56be56dd00","shortId":"UCBuqX","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. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities, all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/payments/268` is labeled \"Premium API Access\" in the x402 challenge. The challenge confirms it accepts USDC (contract 0x8335…2913 on Base) with a maxAmountRequired of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nHowever, the exact functionality behind this particular `/payments/268` path is unclear. The site's landing page lists many distinct API paths (analytics, AI, finance, utilities) but does not specifically document a `/payments/268` route. There is no OpenAPI spec, no detailed request/response schema, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Without documentation of what this endpoint actually returns or what input it expects, callers should treat this as a minimally documented paid endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No OpenAPI or schema documentation available","The /payments/268 path is not listed among the site's advertised API endpoints — its specific functionality is unknown","Docs, pricing, API, and README pages all render only 'Connect wallet' with no usable content","No request body schema or response schema provided — callers cannot know what to send or expect back"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/268","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/268","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 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation of what this specific endpoint does or returns, and the docs pages are empty. The endpoint path '/payments/268' is not listed among the site's advertised APIs, making its purpose 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'/payments/268':166,190 '/request':13,28 '0.02':12,27,69,134 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x8335':120 '20':128 '2913':121 '300':148 '6':137 'Base network API' 'USDC micropayment API' 'accept':117,153 'access':7,22,38,108 'actual':225 'address':144 'ai':58,181 'analyt':57,180 'api':6,21,37,54,81,107,178,206 'application/json':158 'attach':92 'base':9,24,78,123,130 'base-network' 'behind':163 'call':4,19 'caller':90,232 'challeng':112,114 'collect':48 'commit':87 'confirm':115 'connect':212 'content':218 'contract':119 'crypto-paid endpoint' 'data':56 'decim':138 'detail':198 'distinct':177 'doc':203 'document':188,220,239 'endpoint':32,102,152,224,241 'equal':133 'exact':161 'expect':231 'financ':61,182 'function':162 'header':96 'host':46 'howev':159 'infrastructur':64 'input':229 'json-response' 'key':82 'label':105 'land':173 'learn':60 'limit':84 'list':175 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'mani':176 'maxamountrequir':126 'minim':238 'network':79 'no-api-key' 'openapi':195 'page':174,207 'paid':240 'particular':165 'path':167,179 'pay':2,17,51 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':50 'payment':42,95,140 'per':3,18,52,70 'post':154 'premium':5,20,36,106 'premium API access' 'price':67,204 'prompt':214 'protocol':43 'provid':35 'rate':83 'render':209 'request':53,71,99,155 'request/response':199 'requir':89 'return':157,226 'rout':191 'schema':200 'second':149 'sent':142 'settl':73 'simpli':91 'site':45,171 'span':55 'spec':196 'specif':101,187 'timeout':150 'treat':234 'unclear':169 'unit':131 'upfront':86 'usdc':15,30,75,118,135 'usdc-settlement' 'use':136 'util':65,183 'via':10,25,39 'wallet':213 'web3':62 'without':219 'x402':11,26,41,94,111 'x402 API' 'x402-payment'","prices":[{"id":"d1b3713b-863f-4caf-a70b-3945503b5faa","listingId":"0ea2653a-239b-435d-b924-bb56be56dd00","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/268","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:06.944Z"}],"sources":[{"listingId":"0ea2653a-239b-435d-b924-bb56be56dd00","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/268","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:06.944Z","lastSeenAt":"2026-04-22T09:01:17.218Z"}],"details":{"listingId":"0ea2653a-239b-435d-b924-bb56be56dd00","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/268 \\\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 with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/268"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/268"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API services without API key registration","Making one-off paid requests settled in USDC on Base","Integrating pay-per-call endpoints into agent workflows"],"bestFor":["Developers who want keyless, pay-per-request API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","Anyone without USDC on the Base network","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.998Z"},"updatedAt":"2026-04-22T09:01:17.218Z"}}