{"id":"2d417c8f-6198-49ff-b753-b53ccfa7b918","shortId":"nRGCny","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 endpoint `/api/v1/charges/290` is one of many API 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, paid 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 `maxAmountRequired` of 20000 base units corresponds to $0.02 (USDC uses 6 decimals). The payment scheme is \"exact,\" meaning the caller pays the precise amount per request. The timeout is 300 seconds.\n\nHowever, the specific functionality of the `/api/v1/charges/290` endpoint is unclear. It does not correspond to any of the named endpoints listed on the provider's homepage (analytics, AI, finance, or utility APIs). The description simply says \"Premium API Access\" without further detail. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation or schema details, the exact input/output behavior of this particular endpoint cannot be determined.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API"],"warnings":["The specific functionality of /api/v1/charges/290 is unknown — it does not match any named endpoint on the provider's homepage.","All documentation pages (/docs, /pricing, /api, /README) returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI schema or input/output documentation is available.","The provider lists many endpoints but this specific charge ID (290) is not explained anywhere in the crawled content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/290","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/290","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/charges/290 is undocumented. All doc pages return only 'Connect wallet' with no content. No OpenAPI schema, no input/output examples, and no explanation of what this particular endpoint returns after 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'/api/v1/charges/290':47,154 '/docs':192 '/pricing':193 '/readme':195 '/request':13,28 '0.02':12,27,77,124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20000':119 '300':146 '6':127 'Base network API' 'USDC API' 'accept':104 'access':7,22,38,186 'ai':64,175 'amount':140 'analyt':63,174 'api':6,21,37,52,89,179,185 'base':9,24,85,115,120 'base-network' 'behavior':215 'call':4,19 'caller':136 'cannot':220 'categori':60 'challeng':98 'commit':94 'confirm':99 'connect':200 'content':206 'contract':112 'correspond':122,161 'data':62 'decim':128 'descript':181 'detail':189,211 'determin':222 'document':190,208 'endpoint':32,46,53,73,101,155,167,219 'exact':133,213 'financ':67,176 'function':151 'homepag':173 'howev':148 'includ':61 'infrastructur':70 'input/output':214 'key':90 'learn':66 'limit':92 'list':168 'live':103 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':65 'mani':51 'maxamountrequir':117 'mean':134 'micropayment API' 'name':166 'network':86 'no-api-key' 'offer':54 'one':49 'page':191 'paid':80 'particular':218 'pay':2,17,137 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,109,130 'per':3,18,78,141 'post':105 'post-method' 'precis':139 'premium':5,20,36,184 'premium API' 'price':75 'prompt':202 'protocol':43 'provid':35,57,171 'rate':91 'request':79,106,142 'requir':95 'return':197 'say':183 'schema':210 'scheme':131 'second':147 'settl':108 'simpli':182 'span':59 'specif':45,150 'substant':205 'timeout':144 'unclear':157 'unit':121 'usdc':15,30,82,111,125 'usdc-settlement' 'use':126 'util':71,178 'via':10,25,39 'wallet':201 'web3':68 'without':187,207 'x402':11,26,41,97 'x402 API' 'x402-payment'","prices":[{"id":"c59d5561-ba02-4432-9806-5a3edb9d2616","listingId":"2d417c8f-6198-49ff-b753-b53ccfa7b918","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/290","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:56.261Z"}],"sources":[{"listingId":"2d417c8f-6198-49ff-b753-b53ccfa7b918","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/290","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:56.261Z","lastSeenAt":"2026-04-22T11:31:33.625Z"}],"details":{"listingId":"2d417c8f-6198-49ff-b753-b53ccfa7b918","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/290 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header with signed USDC payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/charges/290","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","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/290"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/290"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need instant, keyless API access settled in USDC","Integrating pay-per-use API calls into Web3 applications on Base"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone looking for free or fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.963Z"},"updatedAt":"2026-04-22T11:31:33.625Z"}}