{"id":"c4e96de8-2983-4bc5-9094-a7cf84f0931b","shortId":"DJtAbZ","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 provider operates a suite of pay-per-request APIs spanning data & analytics, 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 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/339` is labeled \"Premium API Access\" in the x402 challenge and accepts POST requests. The challenge advertises 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 with a 300-second timeout. The response MIME type is application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 available. It is unclear what specific data or functionality this particular charges/339 endpoint returns, as the provider's landing page lists many different API categories but does not map charge IDs to specific services.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found","It is unclear what data or service the /api/v1/charges/339 endpoint specifically provides","No request body schema or response schema documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/339","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/339","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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and no clarity on what this specific charges/339 endpoint actually returns. The listing is effectively a 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'/api/v1/charges/339':112 '/docs':174 '/pricing':175 '/readme':178 '0.02':10,24,90,144 '000':133 '0x8335':138 '20':132 '2913':139 '300':160 '6':148 'Base network API' 'USDC micropayment API' 'accept':123 'access':6,20,36,117 'advertis':128 'ai':59 'analysi':63 'analyt':58 'api':5,19,35,55,100,116,226 'application/json':168 'avail':203 'base':8,22,43,97,134,141 'base-network' 'behind':37 'categori':227 'challeng':121,127 'charg':232 'charges/339':214 'classif':66 'commit':107 'connect':184 'content':190 'convers':83 'crypto-paid API' 'data':57,209 'decim':149 'differ':225 'document':169,199 'embed':67 'endpoint':30,86,111,215 'equal':143 'estim':77 'exact':156 'exampl':202 'exchang':72 'extrem':171 'feed':71 'financ':68 'function':211 'gas':76 'gate':3,17 'generat':84 'geocod':81 'given':145 'id':233 'infrastructur':79 'json-response' 'key':101 'label':114 'land':221 'learn':61 'limit':104 'list':223 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':60 'made':152 'mani':224 'map':231 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'x402-payment'","prices":[{"id":"b279569b-b3f4-4537-af93-667a8d191b0e","listingId":"c4e96de8-2983-4bc5-9094-a7cf84f0931b","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/339","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:11.494Z"}],"sources":[{"listingId":"c4e96de8-2983-4bc5-9094-a7cf84f0931b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/339","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:11.494Z","lastSeenAt":"2026-04-24T00:31:57.217Z"}],"details":{"listingId":"c4e96de8-2983-4bc5-9094-a7cf84f0931b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/339 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/339"},{"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 provider offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-request API services without traditional API key registration","Making micropayments in USDC on Base for on-demand data or utility endpoints","Integrating x402-compatible agents with low-cost API calls"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents with x402 payment capability on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume use cases where per-request pricing may add up without bulk discounts","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.277Z"},"updatedAt":"2026-04-24T00:31:57.217Z"}}