{"id":"5dc2e785-7ac2-4260-ae27-ce4e5bd2e07f","shortId":"m8CrVF","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 site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on Base with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/219` is labeled \"Premium API Access\" in the x402 challenge and accepts HTTP POST requests. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per call. Payment is made via the x402 exact scheme, with a 300-second timeout window. The response MIME type is application/json.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint returns. The site's landing page lists many endpoints but does not describe what `/api/v1/charges/219` specifically does beyond the generic \"Premium API Access\" label. Without additional documentation, it is unclear what data or functionality this endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","http-post"],"categories":["api-gateway","pay-per-call"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","micropayment API","USDC API access","Base network API","pay-per-call API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content.","The specific endpoint /api/v1/charges/219 is not listed on the site's landing page catalog; its exact functionality is unknown.","No OpenAPI spec or request/response schema is provided.","No examples of successful responses are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/219","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/219","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 captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response schema, and the specific purpose of /api/v1/charges/219 is undefined beyond a generic label. This is effectively a stub 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'/api/v1/charges/219':111,222 '/docs':174 '/pricing':176 '/readme':178 '0.02':10,24,89,146 '000':133 '0x8335':138 '20':132 '2913':139 '300':159 '6':142 'Base network API' 'USDC API access' 'accept':122 'access':6,20,36,116,230 'addit':233 'advertis':128 'ai/ml':60 'analysi':63 'analyt':59 'api':5,19,35,56,99,115,229 'application/json':168 'base':8,22,43,96,134,141 'base-network' 'behind':37 'beyond':225 'broad':49 'call':55,148 'catalog':50 'challeng':120,127 'classif':65 'commit':106 'connect':184 'content':190 'convers':82 'data':58,239 'decim':143 'describ':220 'document':169,199,234 'embed':66 'endpoint':30,85,110,207,216,243 'equal':145 'estim':76 'exact':155 'exampl':202 'exchang':71 'extrem':171 'feed':70 'financ':67 'function':241 'gas':75 'gate':3,17 'generat':83 'generic':227 'geocod':80 'host':47 'http':123 'http-post' 'infer':61 'infrastructur':78 'json-response' 'key':100 'label':113,231 'land':212 'limit':103 'list':214 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':32 'made':151 'mani':215 'maxamountrequir':130 'micropayment API' 'mime':165 'network':44 'openapi':194 'page':179,213 'particular':206 'pay':9,23,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request' 'payment':149 'paywal':40 'per':11,25,54,90,147 'post':124 'premium':4,18,34,114,228 'price':69,87 'prompt':186 'provid':33,244 'quot':74 'rate':72,102 'render':181 'request':12,26,91,125 'request/response':197 'requir':107 'respons':164 'return':208 'schema':198 'scheme':156 'second':160 'sentiment':62 'settl':92 'site':46,210 'span':57 'spars':172 'spec':195 'specif':109,223 'summar':64 'timeout':161 'token':73 'type':166 'unclear':237 'unit':135 'usdc':14,28,94,137 'usdc-settlement' 'util':79 'valid':81 'via':152 'wallet':185 'web3':68 'window':162 'without':232 'x402':2,16,39,119,154 'x402 premium API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8340c725-2fd6-47dc-8298-dc0f6b754b51","listingId":"5dc2e785-7ac2-4260-ae27-ce4e5bd2e07f","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/219","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:40.546Z"}],"sources":[{"listingId":"5dc2e785-7ac2-4260-ae27-ce4e5bd2e07f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/219","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:40.546Z","lastSeenAt":"2026-04-24T02:32:12.484Z"}],"details":{"listingId":"5dc2e785-7ac2-4260-ae27-ce4e5bd2e07f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/219 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/219"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/219"},{"claim":"All listed endpoints are 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":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without API keys or subscriptions","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.733Z"},"updatedAt":"2026-04-24T02:32:12.484Z"}}