{"id":"2c8e2c66-7110-4644-8fed-37c40c5eb9c1","shortId":"pgaLa4","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The endpoint is live and returns a standard x402 challenge requiring payment in USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request.\n\nThe provider's landing page advertises a broad suite of APIs spanning Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request with no API keys, no rate limits, and instant access. However, this specific endpoint (/api/v1/charges/283) is labeled generically as \"Premium API Access\" and its exact functionality is not documented beyond that label.\n\nThe endpoint accepts HTTP POST requests and returns application/json. Payment is settled via the x402 \"exact\" scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","json-response","http-post"],"categories":["api","infrastructure"],"synonyms":["premium API","paid API access","x402 endpoint","USDC API","Base network API","lowpaymentfee","pay-per-call API"],"warnings":["No documentation found — docs, pricing, and API pages all render only 'Connect wallet' with no content","The exact functionality of /api/v1/charges/283 ('Premium API Access') is undocumented and unclear","No OpenAPI spec, request schema, or response schema available","The provider lists many other endpoints on the landing page but this specific charge endpoint doesn't map to any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/283","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/283","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 ($0.02 USDC on Base) and payment details. However, there is no documentation of what the endpoint actually does, no request/response schema, no examples, and the crawled docs/pricing/API pages were empty beyond a wallet-connect prompt. The specific functionality behind 'Premium API Access' is entirely 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'0.02':82,133 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':187 '0x8335':60 '20':71 '2913':61 '300':190 '6':79 'Base network API' 'USDC API' 'accept':170 'access':6,20,36,145,157 'addit':222 'advertis':90 'ai':104 'amount':66 'analysi':108 'analyt':98 'api':5,19,35,95,138,156,211 'application/json':176 'base':8,22,43,63,73 'behind':37 'beyond':165 'broad':92 'call':69 'challeng':54 'classif':111 'connect':217 'content':223 'contract':59 'convers':128 'crawl':206 'data':97,101 'decim':80 'detail':196 'doc':208 'document':164,198 'embed':112 'endpoint':30,46,149,169 'equal':81 'estim':122 'exact':160,183 'exampl':201 'exchang':117 'export':102 'feed':116 'financ':113 'found':203 'function':161 'gas':121 'gate':3,17 'generat':129 'generic':153 'geocod':126 'howev':146 'http':171 'http-post' 'infrastructur':124 'insight':103 'instant':144 'json-response' 'key':139 'label':152,167 'land':88 'learn':106 'limit':142 'live':48 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':105 'maximum':65 'metric':99 'network':44 'openapi':194 'page':89,212 'paid':9,23 'paid API access' 'pay-per-call API' 'payment':56,177 'paywal':40 'per':11,25,68,83,134 'per-request':10,24 'per-request-billing' 'post':172 'premium':4,18,34,155 'premium API' 'price':115,131,209 'prompt':219 'provid':33,86 'quot':120 'rate':118,141 'render':214 'report':100 'request':12,26,84,135,173 'request/response':197 'requir':55,67 'return':50,175 'schema':195 'scheme':184 'second':191 'sentiment':107 'settl':179 'span':96 'specif':148 'standard':52 'suit':93 'summar':110 'text':109 'timeout':192 'token':119 'unit':74 'usag':200 'usdc':14,28,58,76 'usdc-base' 'util':125 'valid':127 'via':180 'wallet':186,218 'web3':114 'x402':2,16,39,53,182 'x402 endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b1d4e2ad-f81c-40e9-aecf-d47941a5173f","listingId":"2c8e2c66-7110-4644-8fed-37c40c5eb9c1","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/283","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:53.246Z"}],"sources":[{"listingId":"2c8e2c66-7110-4644-8fed-37c40c5eb9c1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/283","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:53.246Z","lastSeenAt":"2026-04-22T12:03:40.097Z"}],"details":{"listingId":"2c8e2c66-7110-4644-8fed-37c40c5eb9c1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/283 \\\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 x402 challenge with maxAmountRequired of 20000 base units USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/283"},{"claim":"Provider advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/283"},{"claim":"Provider lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-call API without needing API keys or subscriptions","Making programmatic requests settled in USDC on Base L2","Agent-driven API consumption with automatic micropayment settlement"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.146Z"},"updatedAt":"2026-04-22T12:03:40.097Z"}}