{"id":"79e84b00-5c73-469c-be1e-447abaedfd6b","shortId":"eXWgya","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, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/165` 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, accepting POST requests, and requires payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network. The response MIME type is `application/json`.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint returns. Agents should be aware that the actual functionality behind this endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC pay-per-call","Base network API","micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/payments/165 ('Premium API Access') is not described anywhere in the crawled material.","No OpenAPI schema or request/response examples are provided.","This endpoint path (/api/v1/payments/165) does not appear in the site's own listed API catalog, raising questions about its purpose."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/165","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/165","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 request/response examples, and the actual functionality of this specific endpoint is entirely unclear. The site's docs pages are empty beyond a wallet connect 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'/request':13,28 '0.02':12,27,81,154 '000':149 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':164 '20':148 '6':159 'Base network API' 'USDC pay-per-call' 'accept':139 'access':7,22,38,110 'actual':223 'addit':198 'address':163 'agent':217 'ai':65 'analyt':64 'api':6,21,37,60,93,109,184 'application/json':174 'avail':231 'awar':220 'base':9,24,89,150,167 'behind':225 'call':4,19 'categori':61 'challeng':133 'clarifi':117 'commit':100 'confirm':134 'connect':193 'content':199 'crawl':113 'data':63 'data/functionality':128 'decim':160 'descript':210 'distinguish':119 'doc':183 'document':175 'endpoint':32,49,74,104,125,136,215,227 'exampl':207 'extrem':180 'financ':68 'function':224 'host':56 'includ':62 'infrastructur':71 'json-response' 'key':94 'label':107 'learn':67 'limit':97 'list':124 'live':138 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':66 'mani':48 'materi':114,232 'micropayment API' 'mime':171 'network':90,168 'no-api-key' 'offer':50 'one':46 'openapi':203 'page':188 'particular':214 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payabl':84 'payment':42,144 'per':3,18,82 'platform':54,77 'post':140 'premium':5,20,36,108 'price':79,185 'prompt':195 'protocol':43 'provid':35 'rate':96 'readm':187 'render':190 'request':83,141 'request/response':206 'requir':101,143 'respons':170 'return':130,216 'schema':204 'sinc':156 'site':178 'spars':181 'specif':103 'type':172 'unclear':229 'unit':151 'usd':155 'usdc':15,30,86,153,157 'usdc-base-network' 'use':158 'util':72 'varieti':58 'via':10,25,39 'wallet':194 'web3':69 'x402':11,26,41,132 'x402 premium API' 'x402-payment'","prices":[{"id":"17b72a22-cc9f-4ea6-be59-553ac3b3a434","listingId":"79e84b00-5c73-469c-be1e-447abaedfd6b","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/165","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:35.366Z"}],"sources":[{"listingId":"79e84b00-5c73-469c-be1e-447abaedfd6b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/165","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:35.366Z","lastSeenAt":"2026-04-23T17:31:47.769Z"}],"details":{"listingId":"79e84b00-5c73-469c-be1e-447abaedfd6b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/165\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with a valid USDC payment proof on Base to access.","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/165"},{"claim":"All endpoints on the platform 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"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/165"}],"useCases":["Accessing a premium API endpoint with per-call USDC micropayments on Base","Demonstrating x402 payment protocol integration for agent-to-API commerce","Testing pay-per-request API patterns without API key registration"],"bestFor":["Developers exploring x402 protocol payment flows","Agents needing keyless, pay-per-call API access on Base","Prototyping micropayment-gated API services"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Production workloads requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.415Z"},"updatedAt":"2026-04-23T17:31:47.769Z"}}