{"id":"340a112c-7570-4b29-a83e-b16f3f8a334e","shortId":"TgJJQP","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 pay-per-request API platform that uses the x402 protocol to gate access to a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific endpoint at `/api/v1/charges/143` is listed as \"Premium API Access\" and accepts payment via USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests with an exact payment scheme. The maximum amount required is 20,000 base units of USDC (which uses 6 decimals), equating to $0.02 per request. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a timeout of 300 seconds. The platform advertises no API keys, no rate limits, and instant access — you simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers additional endpoints at similar pricing ($0.02/request) covering metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, the specific functionality behind `/api/v1/charges/143` (\"Premium API Access\") is not documented beyond its title, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further detail. Without documentation or example responses, the exact data or service returned by this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"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":["The specific functionality of /api/v1/charges/143 ('Premium API Access') is not documented — it is unclear what data or service it returns.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No OpenAPI spec, no request/response schema, and no examples are available.","The endpoint name 'Premium API Access' is generic and does not describe a concrete service."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/143","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/143","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI schema, no example requests or responses, and the actual functionality behind this specific endpoint is entirely undocumented. The docs/pricing/API pages all render only 'Connect wallet' with no 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'metric':177 'network':88 'no-api-key' 'offer':168 'page':222 'particular':247 'pay':9,27,41 'pay-per-call API' 'pay-per-request':40 'payment':82,103,125,157,163 'per':11,29,42,123 'platform':45,140,167 'post':98 'post-endpoint' 'premium':4,22,77,207 'premium API access' 'price':173,188,219 'prompt':229 'proof':164 'protocol':50 'quot':193 'rate':146,191 'remain':249 'render':224 'report':178 'request':12,30,43,99,124 'requir':108 'respons':238 'return':244 'scheme':104 'second':138 'sent':127 'sentiment':182 'servic':243 'similar':172 'simpli':152 'span':59 'specif':70,203 'summar':185 'text':184 'timeout':135 'titl':215 'token':192 'unclear':250 'unit':113 'usdc':14,32,84,115 'usdc-base' 'use':47,117 'util':68 'valid':161,197 'varieti':56 'via':83 'wallet':228 'without':234 'x':156 'x-payment':155 'x402':2,20,49,90,162 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"f71128c6-1574-4fc4-a9fd-70262299a81d","listingId":"340a112c-7570-4b29-a83e-b16f3f8a334e","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/143","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:09.768Z"}],"sources":[{"listingId":"340a112c-7570-4b29-a83e-b16f3f8a334e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/143","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:09.768Z","lastSeenAt":"2026-04-24T06:32:01.165Z"}],"details":{"listingId":"340a112c-7570-4b29-a83e-b16f3f8a334e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/143 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/143"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/143"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no further documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API services without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want instant API access without signup or API keys","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.195Z"},"updatedAt":"2026-04-24T06:32:01.165Z"}}