{"id":"66d99704-dbe4-4116-bab8-b919d67990fb","shortId":"XCAM75","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","description":"lowpaymentfee.com is a platform offering a suite of pay-per-request APIs gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/389` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount required of 20,000 base units — equivalent to $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required; callers simply attach an X-PAYMENT header to each request.\n\nThe broader platform advertises endpoints across four categories: 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint `/api/v1/charges/389` does not clearly map to any of these named services — its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no examples available. The endpoint is confirmed live (returns a valid 402 challenge), but without knowing what it actually does beyond accepting a POST and returning `application/json`, callers should proceed with caution.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto-gated endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt with no content.","The specific endpoint /api/v1/charges/389 has no description beyond 'Premium API Access'; its actual functionality is unknown.","No OpenAPI spec or request/response schema is provided; callers cannot know what to send or what to expect back.","No examples or error handling documentation available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/389","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/389","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no indication of what this specific endpoint actually returns. The docs pages are all empty wallet-connect stubs. This is effectively a stub 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'/api/v1/charges/389':63,176 '/docs':210 '/pricing':212 '/readme':214 '/request':170 '0.02':10,28,94,169 '000':89 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':79 '20':88 '402':247 '402 payment API' '6':99 'Base network API' 'USDC micropayment API' 'accept':70,257 'access':6,24,68,193 'across':127 'actual':254 'advertis':125 'ai':137 'amount':85 'analysi':141 'analyt':131 'api':5,17,23,35,49,67,102,192 'application/json':262 'attach':113 'avail':238 'base':8,26,57,81,90 'base-network' 'beyond':256 'broader':123 'call':96 'caller':111,263 'categori':129 'caution':267 'challeng':248 'classif':144 'clear':179 'commit':108 'confirm':242 'connect':220 'content':226 'contract':78 'convers':161 'crypto-gated endpoint' 'data':130,134,200 'decim':100 'descript':188 'document':197,205 'embed':145 'endpoint':61,126,165,175,240 'equival':92 'estim':155 'exampl':237 'exchang':150 'export':135 'extrem':207 'feed':149 'financ':146 'four':128 'function':202 'gas':154 'gate':3,21,50 'generat':162 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'without':250 'x':116 'x-payment':115 'x402':2,20,53 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"c4972f23-cfac-4220-91ea-caef6be4857e","listingId":"66d99704-dbe4-4116-bab8-b919d67990fb","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/389","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:21.119Z"}],"sources":[{"listingId":"66d99704-dbe4-4116-bab8-b919d67990fb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/389","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:21.119Z","lastSeenAt":"2026-04-23T23:02:31.345Z"}],"details":{"listingId":"66d99704-dbe4-4116-bab8-b919d67990fb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/389 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/389"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/389"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls settled instantly in USDC on Base","Integrating pay-per-request endpoints into autonomous agent workflows"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users comfortable with crypto-native payment flows"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible wallet or USDC balance","Applications requiring high-throughput batch processing with predictable billing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.787Z"},"updatedAt":"2026-04-23T23:02:31.345Z"}}