{"id":"b2511a77-aadd-4780-8595-7545df08e31f","shortId":"BfaXGq","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 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/charges/93` is labeled \"Premium API Access\" in its x402 challenge. The challenge confirms it accepts exact-scheme payments on Base, with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913), which equals $0.02 given USDC's 6 decimals. Payments are sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nHowever, the exact functionality behind this specific `/charges/93` endpoint is unclear. The platform's landing page lists numerous distinct API endpoints (metrics, reports, sentiment analysis, summarization, geocoding, etc.), but this particular charge ID is not explicitly documented among them. No OpenAPI schema, detailed documentation, or example request/response payloads are available — the docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. Without further documentation, the actual data or service returned by this endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["api","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC API access","Base network API","pay-per-call API","micropayment API"],"warnings":["The exact functionality behind /api/v1/charges/93 ('Premium API Access') is not documented anywhere on the site.","No OpenAPI spec, example payloads, or detailed documentation are available — docs pages only show 'Connect wallet'.","The platform lists many endpoints on its landing page, but this specific charge ID does not map to any of them.","Cannot verify what data or service is actually returned after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/93","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/93","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 with clear pricing, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality of /api/v1/charges/93 is undocumented. The docs/pricing/README pages are empty beyond a wallet connect 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'/charges/93':168 '0.02':10,24,79,136 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':132 '20':126 '2913':133 '300':150 '6':140 'Base network API' 'USDC API access' 'accept':115,155 'access':6,20,36,106 'actual':232 'address':146 'ai':63 'among':198 'analysi':185 'analyt':62 'api':5,19,35,58,91,105,180 'application/json':160 'avail':210 'base':8,22,87,121,128 'behind':165 'cannot':240 'categori':59 'challeng':110,112 'charg':192 'commit':96 'confirm':113,242 'connect':221 'content':227 'data':61,233 'decim':141 'detail':203 'distinct':179 'doc':212 'document':197,204,230 'endpoint':30,47,72,100,154,169,181,239 'equal':135 'etc':188 'exact':117,163 'exact-schem':116 'exampl':206 'explicit':196 'financ':66 'function':164 'gate':3,17 'geocod':187 'given':137 'host':54 'howev':161 'http-post' 'id':193 'includ':60 'infrastructur':69 'json-response' 'key':92 'label':103 'land':175 'learn':65 'limit':94 'list':177 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':64 'mani':46 'maxamountrequir':124 'metric':182 'micropayment API' 'network':88 'numer':178 'offer':48 'one':44 'openapi':201 'page':176,216 'particular':191 'pay':9,23 'pay-per-call API' 'pay-per-request' 'payabl':82 'payload':208 'payment':40,119,142 'per':11,25,80 'platform':52,75,173 'post':156 'premium':4,18,34,104 'price':77,213 'prompt':223 'protocol':41 'provid':33 'rate':93 'readm':215 'render':218 'report':183 'request':12,26,81,157 'request/response':207 'requir':97 'return':159,236 'schema':202 'scheme':118 'second':151 'sent':144 'sentiment':184 'servic':235 'specif':99,167 'substant':226 'summar':186 'timeout':152 'unclear':171 'unit':129 'usdc':14,28,84,131,138 'usdc-base' 'util':70 'varieti':56 'via':37 'wallet':222 'web3':67 'without':228 'x402':2,16,39,109 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"d037f1b7-86fd-46ec-b415-b5a9e8bb41c7","listingId":"b2511a77-aadd-4780-8595-7545df08e31f","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:39.865Z"}],"sources":[{"listingId":"b2511a77-aadd-4780-8595-7545df08e31f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:39.865Z","lastSeenAt":"2026-04-22T10:01:45.685Z"}],"details":{"listingId":"b2511a77-aadd-4780-8595-7545df08e31f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/93 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/93"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/93"},{"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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API calls settled on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base for per-call access","Users who want no-signup, no-API-key access to utility endpoints"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible wallet or USDC balance","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.861Z"},"updatedAt":"2026-04-22T10:01:45.685Z"}}