{"id":"987e37a0-9269-45fe-a1a3-9cf9e373ae8b","shortId":"nQzNvY","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-call APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on Base.\n\nThe specific endpoint `/api/v1/charges/279` is labeled \"Premium API Access\" in the x402 challenge. The challenge advertises a maximum amount of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per call. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts POST requests and returns 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, and no examples available. The provider's landing page lists many other endpoints across categories (analytics, AI, finance, utilities), all at the same $0.02 price point, but provides no detail on what inputs this particular endpoint expects or what it returns. Without additional documentation, the actual functionality behind \"Premium API Access\" at `/api/v1/charges/279` remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC API access","Base network 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 functionality of /api/v1/charges/279 ('Premium API Access') is not described anywhere","No examples of request or response payloads available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/279","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/279","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and pricing is $0.02 USDC on Base. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of this specific endpoint is undefined. This is effectively a stub 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'0.02':10,24,70,112,189 '000':99 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':105 '20':98 '300':125 '6':108 'Base network API' 'USDC API access' 'accept':130 'access':6,20,36,86,216 'across':179 'actual':211 'addit':208 'advertis':93 'ai':182 'ai/ml':59 'amount':96 'analyt':58,181 'api':5,19,35,55,85,142,215 'application/json':135 'asset':104 'avail':169 'base':8,22,43,77,100 'base-network' 'behind':37,213 'call':54,114 'categori':180 'challeng':90,92 'connect':151 'content':157 'data':57,63 'decim':109 'detail':195 'doc':141 'document':136,209 'endpoint':30,80,129,178,201 'equat':110 'exact':121 'exampl':168 'expect':202 'extrem':138 'financ':61,183 'function':212 'gate':3,17 'infer':60 'infrastructur':65 'input':198 'json-response' 'label':83 'land':173 'list':175 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':32 'made':117 'mani':176 'maximum':95 'network':44 'no-api-key' 'openapi':161 'oper':47 'page':146,174 'particular':200 'pay':9,23,52 'pay-per-cal':51 'pay-per-call API' 'pay-per-request' 'payment':115 'paywal':40 'per':11,25,53,71,113 'point':191 'post':131 'premium':4,18,34,84,214 'price':68,143,190 'prompt':153 'provid':33,46,171,193 'readm':145 'remain':219 'render':148 'request':12,26,72,132 'request/response':164 'return':134,206 'schema':165 'scheme':122 'second':126 'settl':73 'span':56 'spars':139 'spec':162 'specif':79 'suit':49 'timeout':127 'unclear':220 'unit':101 'usdc':14,28,75,103 'usdc-settlement' 'use':107 'util':66,184 'via':118 'wallet':152 'web3':62 'without':207 'x402':2,16,39,89,120 'x402 premium API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"3b7b7cc7-c753-4596-b610-fc50d33d4b9f","listingId":"987e37a0-9269-45fe-a1a3-9cf9e373ae8b","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/279","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:50.836Z"}],"sources":[{"listingId":"987e37a0-9269-45fe-a1a3-9cf9e373ae8b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/279","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:50.836Z","lastSeenAt":"2026-04-24T01:32:05.499Z"}],"details":{"listingId":"987e37a0-9269-45fe-a1a3-9cf9e373ae8b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/279 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equating to $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/279"},{"claim":"The provider lists all APIs at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for API access without needing API keys or subscriptions","Programmatic agent-driven API consumption with on-chain USDC micropayments","Accessing premium data or services via x402 protocol on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer on-chain micropayments over traditional 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":"2026-02-17T23:14:23.258Z"},"updatedAt":"2026-04-24T01:32:05.499Z"}}