{"id":"c2c76c9e-a50a-4521-924c-0f8ef9a3c80c","shortId":"t3fkaP","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. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a collection of pay-per-request APIs spanning 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, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/357` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nHowever, the exact functionality behind this particular `/charges/357` endpoint is unclear. The site's landing page lists specific APIs (metrics, reports, sentiment analysis, summarization, etc.) but does not describe a generic \"charges\" endpoint. No OpenAPI schema, detailed documentation, or example request/response payloads were found — the docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt. Without more information, it is difficult to determine what data or service this endpoint returns beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The exact functionality of /api/v1/charges/357 ('Premium API Access') is not documented anywhere in the crawled material.","No OpenAPI schema, example payloads, or detailed docs are available — all doc pages render only 'Connect wallet'.","The endpoint path '/charges/357' does not match any of the named APIs listed on the homepage (analytics, AI, finance, utils).","Cannot verify what data or service is actually returned after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/357","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/357","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality of /api/v1/charges/357 is undefined. The docs/pricing/API pages all render only a wallet-connect prompt with no useful 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'/charges/357':168 '/request':13,28 '0.02':12,27,81,139 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':155 '0x8335':133 '20':127 '2913':134 '300':158 '6':143 'Base network API' 'USDC micropayment API' 'accept':113 'access':7,22,38,111,239 'ai':68 'analysi':183 'analyt':67 'api':6,21,37,64,93,110,179,208,238 'base':9,24,89,129,136 'behind':165 'beyond':234 'call':4,19 'challeng':118 'charg':192 'collect':58 'commit':100 'confirm':119 'connect':216 'crypto-paid endpoint' 'data':66,228 'decim':144 'describ':189 'detail':197 'determin':226 'difficult':224 'doc':206 'document':198 'endpoint':32,49,77,104,169,193,232 'equal':138 'etc':185 'exact':151,163 'exampl':200 'financ':71 'found':204 'function':164 'generic':191,236 'given':140 'host':56 'howev':161 'http-post' 'inform':221 'infrastructur':74 'key':94 'label':240 'land':175 'learn':70 'limit':97 'list':107,177 'live':122 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':147 'mani':48 'maximum':125 'metric':180 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':195 'page':176,211 'paid':84 'particular':167 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payload':202 'payment':42,145 'per':3,18,62,82 'platform':54 'post':114 'premium':5,20,36,109,237 'premium API access' 'price':79,207 'prompt':218 'protocol':43 'provid':35 'rate':96 'readm':210 'render':213 'report':181 'request':63,83,115,123 'request/response':201 'requir':101 'return':233 'schema':196 'scheme':152 'second':159 'sentiment':182 'servic':230 'site':173 'span':65 'specif':103,178 'summar':184 'timeout':160 'unclear':171 'unit':130 'usdc':15,30,86,132,141 'usdc-base' 'util':75 'via':10,25,39,148 'wallet':154,217 'web3':72 'without':219 'x402':11,26,41,117,150 'x402 API' 'x402-payment'","prices":[{"id":"5493ddf8-19ec-4fe6-9759-1309c6cd04a6","listingId":"c2c76c9e-a50a-4521-924c-0f8ef9a3c80c","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/357","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:13.325Z"}],"sources":[{"listingId":"c2c76c9e-a50a-4521-924c-0f8ef9a3c80c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/357","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:13.325Z","lastSeenAt":"2026-04-24T00:31:57.368Z"}],"details":{"listingId":"c2c76c9e-a50a-4521-924c-0f8ef9a3c80c","quickStartSnippet":"# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/357\n# 2. Parse the 402 response, construct an X-PAYMENT header\n#    with a signed USDC payment of 0.02 USD on Base, then:\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/357 \\\n  -H \"X-PAYMENT: <signed-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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 requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/357"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/357"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API services without traditional API key registration","Making micropayment-gated API calls using USDC on Base","Integrating pay-per-use endpoints into agent workflows via x402"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed documentation or OpenAPI specs before integration","Applications requiring free or subscription-based API access","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.155Z"},"updatedAt":"2026-04-24T00:31:57.368Z"}}