{"id":"3e0c306f-65df-401f-bc39-cd0541e1752a","shortId":"eNYWCP","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. The specific resource at `/api/v1/charges/175` 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 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 x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02 per call. The payment timeout is 300 seconds. The response MIME type is `application/json`.\n\nHowever, the specific functionality behind `/api/v1/charges/175` is not documented — the description is simply \"Premium API Access\" with no further detail on what data or service it returns. The provider's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical documentation or schema information. This makes it difficult to determine the exact input parameters or output format for this particular endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["The exact functionality of /api/v1/charges/175 is undocumented; 'Premium API Access' is the only description available.","All documentation pages (docs, api, pricing, README) render only 'Connect wallet' with no technical content.","No OpenAPI spec, input schema, or output schema is available for this endpoint.","The provider lists many other endpoints but this specific charge ID (175) does not map to any named endpoint on the landing page."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/175","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/175","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, confirming pricing and network. However, the specific functionality of /api/v1/charges/175 is entirely undocumented — no input schema, no output schema, no examples, and all doc pages render only 'Connect wallet'. The listing is effectively a stub with confirmed liveness but unknown 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'/request':13,28 '0.02':12,27,77,132 '000':122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20':121 '300':139 '6':127 'Base network API' 'USDC API' 'accept':104 'access':7,22,38,162 'addit':191 'ai':64 'amount':118 'analyt':63 'api':6,21,37,89,161,180 'application/json':146 'base':9,24,85,115,123 'base-network' 'behind':151 'call':4,19,134 'categori':60 'challeng':98 'commit':94 'confirm':99 'connect':186 'contract':112 'data':62,169 'decim':128 'descript':157 'detail':166 'determin':202 'difficult':200 'doc':177 'document':155,193 'endpoint':32,53,73,101,213 'equal':131 'exact':204 'financ':67 'format':209 'function':150 'howev':147 'includ':61 'inform':196 'infrastructur':70 'input':205 'json-response' 'key':90 'learn':66 'limit':92 'live':103 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':65 'make':198 'mani':52 'max':117 'micropayment API' 'mime':143 'network':86 'no-api-key' 'offer':54 'one':50 'output':208 'page':181 'paramet':206 'particular':212 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':80 'payment':42,109,136 'per':3,18,78,133 'post':105 'post-method' 'premium':5,20,36,160 'premium API' 'price':75,178 'prompt':188 'protocol':43 'provid':35,57,175 'rate':91 'render':183 'request':79,106 'requir':95,119 'resourc':46 'respons':142 'return':173 'schema':195 'second':140 'servic':171 'settl':108 'simpli':159 'span':59 'specif':45,149 'technic':192 'timeout':137 'type':144 'unit':124 'usdc':15,30,82,111,130 'usdc-settlement' 'util':71 'via':10,25,39 'wallet':187 'web3':68 'x402':11,26,41,97 'x402 endpoint' 'x402-payment'","prices":[{"id":"41112e1e-a741-4005-82f2-1aa609f8208e","listingId":"3e0c306f-65df-401f-bc39-cd0541e1752a","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/175","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:25.450Z"}],"sources":[{"listingId":"3e0c306f-65df-401f-bc39-cd0541e1752a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/175","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:25.450Z","lastSeenAt":"2026-04-22T13:30:57.791Z"}],"details":{"listingId":"3e0c306f-65df-401f-bc39-cd0541e1752a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/175 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/175"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/175"},{"claim":"Payment timeout is 300 seconds","source_url":"https://lowpaymentfee.com/api/v1/charges/175"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access on Base","Testing x402 payment protocol integrations with a low-cost 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-commitment, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","Use cases requiring known, well-documented input/output schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.45Z"},"updatedAt":"2026-04-22T13:30:57.791Z"}}