{"id":"e20a9bc7-aaee-4db6-b289-81154524c6b6","shortId":"9pDzrN","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 on the Base network. It is one of many endpoints offered by the platform, which spans 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 (USD Coin) on Base with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/charges/268` is labeled \"Premium API Access\" but the crawl material does not clarify what data or functionality this particular charge ID returns — it is not listed among the named endpoints on the homepage. The platform's homepage lists endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. This charge ID (268) may correspond to one of those or to an unlisted resource.\n\nThe 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) to wallet `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The response MIME type is `application/json`. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","misc"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","base network api","crypto-paid api"],"warnings":["The specific functionality of /api/v1/charges/268 ('Premium API Access') is not documented anywhere in the crawl material — it is unclear what this endpoint actually returns.","No OpenAPI spec, request schema, or response schema is available.","Documentation, pricing, API, and README pages all returned only 'Connect wallet' with no substantive content.","The platform lists many endpoints on its homepage but this charge ID does not correspond to any of them by name."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/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/charges/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 challenge, but there is no documentation, no OpenAPI schema, no example request/response, and the specific functionality behind charge ID 268 is unspecified. The crawl pages beyond the homepage returned only 'Connect wallet' with no useful 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'0.02':10,24,78,205 '000':200 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':214 '20':199 '268':170 '6':210 'USDC micropayment api' 'accept':190 'access':6,20,36,108 'ai':62 'among':129 'analysi':149 'analyt':61 'api':5,19,35,90,107 'application/json':222 'base':8,22,44,87,201,216 'base network api' 'categori':58 'challeng':184 'charg':122,168 'clarifi':115 'classif':152 'coin':85 'commit':98 'confirm':185 'convers':164 'correspond':172 'crawl':111,235 'crypto-paid api' 'data':60,117,145 'decim':211 'detail':226 'document':227 'embed':153 'endpoint':30,51,71,102,132,141,187 'estim':161 'exampl':229 'exchang':156 'export':146 'feed':155 'financ':65 'found':232 'function':119 'gas':160 'gate':3,17 'generat':166 'geocod':162 'homepag':135,139 'id':123,169 'includ':59 'infrastructur':68 'insight':147 'json-response' 'key':91 'label':105 'learn':64 'limit':94 'list':128,140 'live':189 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':63 'mani':50 'materi':112 'may':171 'metric':143 'mime':219 'minimum':97 'name':131 'network':45 'no-api-key' 'no-rate-limit' 'offer':52 'one':48,174 'openapi':224 'particular':121 'pay':9,23 'pay-per-call api' 'pay-per-request' 'payabl':81 'payment':40,195 'per':11,25,79 'platform':55,74,137 'post':191 'premium':4,18,34,106 'price':76,154 'protocol':41 'provid':33 'quot':159 'rate':93,157 'report':144 'request':12,26,80,192 'requir':99,194 'resourc':181 'respons':218,230 'return':124 'schema':225 'sentiment':148 'sinc':207 'span':57 'specif':101 'summar':151 'text':150 'token':158 'type':220 'unit':202 'unlist':180 'usd':84,206 'usdc':14,28,83,204,208 'usdc-base' 'use':209 'util':69 'valid':163 'via':37 'wallet':213 'web3':66 'x402':2,16,39,183 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"7e576b53-44d2-448d-b39a-64dc9fb46e75","listingId":"e20a9bc7-aaee-4db6-b289-81154524c6b6","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/charges/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":"2026-04-18T18:44:47.280Z"}],"sources":[{"listingId":"e20a9bc7-aaee-4db6-b289-81154524c6b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/268","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:47.280Z","lastSeenAt":"2026-04-22T09:01:00.898Z"}],"details":{"listingId":"e20a9bc7-aaee-4db6-b289-81154524c6b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/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 requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/268"},{"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 address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/268"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-use API access on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.41Z"},"updatedAt":"2026-04-22T09:01:00.898Z"}}