{"id":"e640a25a-1486-4c4c-b30c-c0bcc3aaae3b","shortId":"df8L34","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on Base.\n\nThe specific endpoint `/api/v1/charges/368` is labeled \"Premium API Access\" in the x402 challenge. Its exact functionality beyond the generic label is unclear — the site does not document what this particular charge ID returns, and the crawled docs, pricing, and README pages all rendered only a wallet-connect prompt with no additional content. The x402 challenge confirms the endpoint is live, accepts POST requests, requires a maximum payment of 20,000 base units of USDC (i.e., $0.02 given 6 decimals), and responds with `application/json`.\n\nBecause the site lacks OpenAPI specs, detailed endpoint documentation, request/response schemas, or examples, the actual input parameters and output format for this endpoint remain unknown. Agents should treat this as a low-cost, keyless API call but should be prepared to discover the request format experimentally.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API","keyless API"],"warnings":["Endpoint functionality is unknown — 'Premium API Access' is a generic label with no documentation of inputs or outputs.","No OpenAPI or schema documentation available; request format must be discovered experimentally.","Docs, pricing, and README pages on the site render only a wallet-connect prompt with no useful content.","The charge ID 368 is not referenced anywhere in the site's listed API catalog, so it may be a custom or unlisted endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/368","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/368","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and network, but the endpoint's actual functionality is undocumented. No OpenAPI spec, no request/response schema, no examples, and the docs/pricing/README pages are empty beyond a wallet-connect prompt. The 'Premium API Access' label is generic and 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'0.02':10,28,100,184 '000':178 '20':177 '6':186 'Base network API' 'USDC API' 'accept':169 'access':6,24,44,116 'actual':206 'addit':159 'agent':217 'ai':69 'analysi':73 'analyt':68 'api':5,16,23,34,43,65,115,227 'application/json':191 'base':8,26,52,107,179 'base-network' 'beyond':124 'broad':58 'call':64,228 'catalog':59 'challeng':120,163 'charg':138 'classif':76 'confirm':164 'connect':155 'content':160 'convers':93 'cost':225 'crawl':143 'data':67 'decim':187 'detail':198 'discov':234 'doc':144 'document':134,200 'embed':77 'endpoint':38,96,110,166,199,214 'estim':87 'exact':122 'exampl':204 'exchang':82 'experiment':238 'feed':81 'financ':78 'format':211,237 'function':123 'gas':86 'gate':3,21 'generat':94 'generic':126 'geocod':91 'given':185 'host':56 'i.e':183 'id':139 'infrastructur':89 'input':207 'json-response' 'key':17,35 'keyless':226 'keyless API' 'label':113,127 'lack':195 'learn':71 'live':168 'low':224 'low-cost':223 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':70 'maximum':174 'micropayment API' 'network':53 'no-api-key' 'openapi':196 'output':210 'page':148 'paramet':208 'particular':137 'pay':9,27,62 'pay-per-cal':61 'pay-per-call API' 'pay-per-request' 'payment':48,175 'per':11,29,63,101 'post':170 'post-method' 'premium':4,22,42,114 'premium API' 'prepar':232 'price':80,98,145 'prompt':156 'protocol':49 'provid':41 'quot':85 'rate':83 'readm':147 'remain':215 'render':150 'request':12,30,102,171,236 'request/response':201 'requir':18,36,172 'respond':189 'return':140 'schema':202 'sentiment':72 'settl':103 'site':55,131,194 'span':66 'spec':197 'specif':109 'summar':75 'text':74 'token':84 'treat':219 'unclear':129 'unit':180 'unknown':216 'usdc':14,32,105,182 'usdc-settlement' 'util':90 'valid':92 'via':45 'wallet':154 'wallet-connect':153 'web3':79 'x402':2,20,47,119,162 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"a6c1c845-fe96-4bf3-b1ef-46643147d91f","listingId":"e640a25a-1486-4c4c-b30c-c0bcc3aaae3b","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/368","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:10.268Z"}],"sources":[{"listingId":"e640a25a-1486-4c4c-b30c-c0bcc3aaae3b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/368","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:10.268Z","lastSeenAt":"2026-04-24T00:03:23.241Z"}],"details":{"listingId":"e640a25a-1486-4c4c-b30c-c0bcc3aaae3b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/368 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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/charges/368"},{"claim":"All listed APIs 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 site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/368"}],"useCases":["Programmatic access to a pay-per-call API without managing API keys or subscriptions","Agent-driven workflows that need low-cost, on-demand API calls settled in USDC on Base","Exploring x402-protocol-based API marketplaces for data, AI, finance, or utility services"],"bestFor":["Developers or agents wanting keyless, pay-per-request API access","Low-volume or sporadic API consumers who prefer no commitments or minimums","x402-compatible agents that can settle USDC payments on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before calling","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":"2026-02-17T23:14:22.364Z"},"updatedAt":"2026-04-24T00:03:23.241Z"}}