{"id":"29f3a484-13c4-498d-8716-ed6295b2c325","shortId":"qk7eKY","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per 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 broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform share a uniform $0.02-per-request pricing model settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/benefits/15` is labeled \"Premium API Access\" in the x402 challenge but lacks further documentation about what data or functionality it returns. The probe confirms the endpoint is live, returning a valid x402 402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USD given 6 decimals). Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nDocumentation on the site is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no description of what \"Premium API Access\" actually provides. Prospective callers should be aware that the exact input parameters and output format are unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","premium api","x402 api","pay-per-call api","base usdc api","micropayment api"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet' with no content.","The exact functionality of /api/v1/benefits/15 ('Premium API Access') is completely undocumented; input parameters and response schema are unknown.","No OpenAPI or schema definition found for any endpoint on the platform."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/15","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/benefits/15","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, confirming pricing and payment details. However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what 'Premium API Access' actually returns. The listing is effectively a 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'0.02':10,24,83,143 '000':138 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '20':137 '300':158 '402':131 '6':146 'accept':163 'access':6,20,36,104,209 'actual':210 'address':152 'ai':67 'analyt':66 'api':5,19,35,63,103,179,208 'application/json':168 'avail':228 'awar':216 'base':8,22,94,139,155 'base usdc api' 'broad':56 'call':62 'caller':213 'catalog':57 'challeng':108,132 'confirm':122 'connect':187 'content':193 'data':65,115 'decim':147 'descript':204 'doc':177 'document':112,169 'endpoint':30,47,76,98,124,162 'exact':219 'extrem':174 'financ':70 'format':224 'function':117 'gate':3,17 'given':145 'host':54 'infrastructur':73 'input':220 'json-response' 'label':101 'lack':110 'learn':69 'live':126 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':68 'made':150 'mani':46 'materi':229 'maxamountrequir':135 'micropayment api' 'model':88 'network':95 'offer':48 'one':44 'openapi':197 'output':223 'page':182 'paramet':221 'pay':9,23,60 'pay-per-cal':59 'pay-per-call api' 'pay-per-request' 'payment':40,148 'per':11,25,61,85 'per-request':84 'platform':52,79 'post':164 'post-method' 'premium':4,18,34,102,207 'premium api' 'price':87,178 'probe':121 'prompt':189 'prospect':212 'protocol':41 'provid':33,211 'readm':181 'render':184 'request':12,26,86,165 'request/response':200 'return':119,127,167 'schema':201 'second':159 'settl':89 'share':80 'site':172 'span':64 'spars':175 'spec':198 'specif':97 'substant':192 'timeout':160 'uniform':82 'unit':140 'unknown':226 'usd':144 'usdc':14,28,91,142 'usdc-base' 'util':74 'valid':129 'via':37 'wallet':188 'web3':71 'x402':2,16,39,107,130 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"de726291-8666-4f88-808c-76475ebc6961","listingId":"29f3a484-13c4-498d-8716-ed6295b2c325","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/benefits/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:35.902Z"}],"sources":[{"listingId":"29f3a484-13c4-498d-8716-ed6295b2c325","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:35.902Z","lastSeenAt":"2026-04-22T02:31:44.582Z"}],"details":{"listingId":"29f3a484-13c4-498d-8716-ed6295b2c325","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/15 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header after settling USDC on Base.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/benefits/15","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/15"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/15"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API endpoint with per-request USDC micropayments on Base","Integrating x402-compatible payment flows into agent or application workflows","Exploring low-cost pay-per-use API services without API keys or subscriptions"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that can settle USDC payments on Base for per-call API access","Users who want keyless, commitment-free API access"],"notFor":["Anyone needing detailed documentation or guaranteed SLAs before integrating","Use cases requiring known, well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.389Z"},"updatedAt":"2026-04-22T02:31:44.582Z"}}