{"id":"e5f3ec67-ab9a-4d59-8fe8-64543acd9bdc","shortId":"eK54bp","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 variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/296` is labeled \"Premium API Access\" but the crawled material does not clarify what distinguishes it from the other listed endpoints or what data/functionality it returns. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The response MIME type is `application/json`.\n\nNo OpenAPI schema, detailed documentation, or example responses were found in the crawl. The docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without further documentation it is unclear what request body this endpoint expects or what JSON it returns upon successful payment.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC API access","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all render only 'Connect wallet' with no content.","The specific functionality of /api/v1/payments/296 ('Premium API Access') is not described anywhere in the crawled material.","No OpenAPI schema or example request/response bodies are available.","This endpoint path (/api/v1/payments/296) does not appear in the site's own listed API catalog, making its purpose ambiguous."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/296","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/296","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, but there is no documentation, no OpenAPI schema, no example requests or responses, and the purpose of this specific endpoint (/api/v1/payments/296) is entirely unclear. The docs pages are empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,81,152 '000':147 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':163 '20':146 '6':157 'Base network API' 'USDC API access' 'accept':137 'access':7,22,38,108 'address':162 'ai':65 'analyt':64 'api':6,21,37,60,93,107,185 'application/json':169 'base':9,24,89,148,160 'bodi':209 'call':4,19 'categori':61 'challeng':131 'clarifi':115 'commit':98 'confirm':132 'connect':194 'content':200 'crawl':111,182 'data':63 'data/functionality':126 'decim':158 'detail':173 'distinguish':117 'doc':184 'document':174,203 'endpoint':32,49,74,102,123,134,211 'exampl':176 'expect':212 'financ':68 'found':179 'host':56 'includ':62 'infrastructur':71 'json':215 'json-response' 'key':94 'label':105 'learn':67 'limit':96 'list':122 'live':136 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':66 'mani':48 'materi':112 'mime':166 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':171 'page':189 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':84 'payment':42,142,220 'per':3,18,82 'platform':54,77 'post':138 'premium':5,20,36,106 'price':79,186 'prompt':196 'protocol':43 'provid':35 'rate':95 'readm':188 'render':191 'request':83,139,208 'requir':99,141 'respons':165,177 'return':128,217 'schema':172 'sinc':154 'specif':101 'substant':199 'success':219 'type':167 'unclear':206 'unit':149 'upon':218 'usd':153 'usdc':15,30,86,151,155 'usdc-base' 'use':156 'util':72 'varieti':58 'via':10,25,39 'wallet':195 'web3':69 'without':201 'x402':11,26,41,130 'x402 premium API' 'x402-payment'","prices":[{"id":"2c415fec-8fa4-402d-82e6-1f9c9a0d741c","listingId":"e5f3ec67-ab9a-4d59-8fe8-64543acd9bdc","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/296","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:19.266Z"}],"sources":[{"listingId":"e5f3ec67-ab9a-4d59-8fe8-64543acd9bdc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/296","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:19.266Z","lastSeenAt":"2026-04-23T12:31:28.317Z"}],"details":{"listingId":"e5f3ec67-ab9a-4d59-8fe8-64543acd9bdc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/296 \\\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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/296"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, rate limits, or commitments","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"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/296"}],"useCases":["Accessing a pay-per-call API without needing API key registration","Making micropayments for API services using USDC on Base","Agent-driven programmatic API consumption with x402 payment flow"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payment challenges automatically","Users who prefer pay-as-you-go pricing with no rate limits"],"notFor":["Users who need detailed API documentation before integrating","Anyone requiring fiat-only payment methods","High-volume consumers who need bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.405Z"},"updatedAt":"2026-04-23T12:31:28.317Z"}}