{"id":"751d6813-546a-43bd-a4eb-5dc6d48eb172","shortId":"SmKRVz","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 site hosts a collection of pay-per-request 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, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/charges/83` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired 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 by including an X-PAYMENT header. The endpoint accepts POST requests and returns application/json responses. The payment timeout is 300 seconds.\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 schema, no request/response examples, and no detailed documentation describing what this particular endpoint actually returns or what parameters it accepts. The site's landing page confirms the general API catalog and pricing model, but the specific behavior of `/api/v1/charges/83` is unclear beyond its title.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","misc"],"synonyms":["premium API","lowpaymentfee","x402 API","USDC API access","Base network API","micropayment API","pay-per-call API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific function of /api/v1/charges/83 is unclear; the title 'Premium API Access' is generic","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/83","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/83","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 payment details. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The specific purpose of /api/v1/charges/83 beyond its title 'Premium API Access' is 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'/request':13,28 '0.02':12,27,87,140 '000':129 '0x8335':134 '20':128 '2913':135 '300':174 '6':144 'Base network API' 'USDC API access' 'accept':163,221 'access':7,22,38,117 'actual':215 'ai/ml':58 'analysi':61 'analyt':57 'api':6,21,37,54,99,116,182,230 'application/json':168 'base':9,24,95,130,137 'behavior':238 'beyond':243 'call':4,19 'catalog':231 'challeng':123 'classif':63 'collect':48 'commit':107 'confirm':227 'connect':191 'content':197 'convers':80 'data':56 'decim':145 'describ':210 'detail':208 'doc':181 'document':176,209 'embed':64 'endpoint':32,83,110,162,214 'equal':139 'estim':74 'exact':152 'exampl':205 'exchang':69 'extrem':178 'feed':68 'financ':65 'gas':73 'general':229 'generat':81 'geocod':78 'given':141 'header':160 'host':46 'includ':155 'infer':59 'infrastructur':76 'json-response' 'key':100 'land':225 'limit':103 'list':113 'lowpaymentfee' 'lowpaymentfee.com':34 'made':148 'maxamountrequir':126 'micropayment API' 'minimum':106 'model':234 'network':96 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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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:36.227Z"}],"sources":[{"listingId":"751d6813-546a-43bd-a4eb-5dc6d48eb172","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:36.227Z","lastSeenAt":"2026-04-22T07:31:04.700Z"}],"details":{"listingId":"751d6813-546a-43bd-a4eb-5dc6d48eb172","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/83 \\\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, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/83"},{"claim":"Site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that need keyless, pay-per-call API access","Users who want to avoid subscription commitments for occasional API usage"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.091Z"},"updatedAt":"2026-04-22T07:31:04.700Z"}}