{"id":"e789b9ef-a42a-42bf-919f-566daeff3bab","shortId":"BTv3Ez","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\" behind an x402 paywall on the Base network. The specific resource at `/api/v1/charges/106` is one of many endpoints offered by the provider, which spans categories including 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 (USD Coin) on Base, with no API keys, no rate limits, and no minimum commitments required.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the x402 \"exact\" scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a maxAmountRequired of 20000 base units of USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`, 6 decimals), which equals $0.02. The timeout is 300 seconds.\n\nHowever, the specific functionality behind `/api/v1/charges/106` is unclear. The provider's landing page lists many endpoints (metrics, reports, sentiment analysis, summarization, etc.) but does not document what `/api/v1/charges/106` specifically returns. No OpenAPI spec, detailed docs, or example responses were found — the docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without knowing the actual input/output schema or what data this particular endpoint provides, agents should treat this as a partially documented resource.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific functionality of /api/v1/charges/106 is undocumented — it is unclear what data or service it provides.","No OpenAPI spec or schema is available for request or response bodies.","All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no substantive content.","The provider lists many endpoint categories (AI, analytics, finance, etc.) but none map directly to /api/v1/charges/106."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/106","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/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation of what this specific endpoint does, no OpenAPI spec, no example requests or responses, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The actual functionality of /api/v1/charges/106 is 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'0.02':10,24,81,144 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':128 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':139 '20000':133 '300':148 '6':140 'Base network API' 'USDC micropayment API' 'accept':115 'access':6,20,36 'actual':211 'address':127 'agent':221 'ai':65 'analysi':169 'analyt':64 'api':5,19,35,96,192 'base':8,22,43,93,134 'base-network' 'behind':37,154 'categori':61 'challeng':108 'coin':91 'commit':104 'confirm':109 'connect':201 'content':207 'contract':138 'crypto-paid API' 'data':63,216 'decim':141 'detail':183 'doc':184,191 'document':175,228 'endpoint':30,54,74,111,165,219 'equal':143 'etc':171 'exact':124 'exampl':186 'financ':68 'found':189 'function':153 'gate':3,17 'howev':150 'includ':62 'infrastructur':71 'input/output':212 'key':97 'know':209 'land':161 'learn':67 'limit':100 'list':163 'live':113 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':66 'made':120 'mani':53,164 'maxamountrequir':131 'metric':166 'minimum':103 'model':86 'network':44 'no-api-key' 'offer':55 'one':51 'openapi':181 'page':162,196 'partial':227 'particular':218 'pay':9,23 'pay-per-call API' 'pay-per-request' 'payment':118 'paywal':40 'per':11,25,83 'per-request':82 'platform':77 'post':116 'post-endpoint' 'premium':4,18,34 'premium API access' 'price':85,193 'prompt':203 'provid':33,58,159,220 'rate':99 'readm':195 'render':198 'report':167 'request':12,26,84,117 'requir':105 'resourc':47,229 'respons':187 'return':179 'schema':213 'scheme':125 'second':149 'sentiment':168 'settl':87 'share':78 'span':60 'spec':182 'specif':46,152,178 'substant':206 'summar':170 'timeout':146 'treat':223 'unclear':157 'uniform':80 'unit':135 'usd':90 'usdc':14,28,89,137 'usdc-settlement' 'util':72 'via':121 'wallet':202 'web3':69 'without':208 'x402':2,16,39,107,123 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6ba2c070-0d72-41d6-9324-cd0f08556456","listingId":"e789b9ef-a42a-42bf-919f-566daeff3bab","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/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:13.974Z"}],"sources":[{"listingId":"e789b9ef-a42a-42bf-919f-566daeff3bab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/106","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:13.974Z","lastSeenAt":"2026-04-24T05:32:02.689Z"}],"details":{"listingId":"e789b9ef-a42a-42bf-919f-566daeff3bab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/106 \\\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":"Endpoint returns HTTP 402 with x402 challenge, maxAmountRequired 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/106"},{"claim":"All endpoints 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":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/106"},{"claim":"Provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Programmatic agent access to paid endpoints using x402 USDC micropayments on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers exploring x402 protocol integrations","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","Applications requiring known, well-documented input/output schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.037Z"},"updatedAt":"2026-04-24T05:32:02.689Z"}}