{"id":"68b6082a-307a-4b78-9a95-f62f2e500c20","shortId":"kZWpXu","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. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request.\n\nThe specific endpoint `/api/v1/payments/211` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The platform advertises a keyless, no-rate-limit model: callers pay per request using USDC on the Base network (asset contract 0x8335…2913). The x402 challenge confirms a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02. 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 technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint is confirmed live (402 challenge returned), but without knowing what data or service this particular path provides, callers should treat it as exploratory.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","base network api","keyless api access"],"warnings":["No documentation available — all doc/API/pricing/README pages render only 'Connect wallet' with no technical content","No OpenAPI or request/response schema provided","The specific purpose of /api/v1/payments/211 ('Premium API Access') is undefined — unclear what data or service it returns","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/211","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/payments/211","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no request/response schema, no examples, and the specific functionality of this endpoint path is unknown. Docs pages return only wallet-connect 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'/request':13,28 '0.02':12,27,70,138 '000':128 '0x8335':118 '20':127 '2913':119 '402':192 '6':133 'USDC micropayment api' 'accept':141 'access':7,22,38,81 'advertis':98 'ai':58 'analyt':57 'api':6,21,37,80,153 'application/json':146 'asset':116 'avail':182 'base':9,24,114,129 'base network api' 'beyond':93 'call':4,19 'caller':106,206 'categori':66 'challeng':85,122,193 'confirm':123,190 'connect':162 'contract':117 'crawl':185 'data':56,199 'decim':134 'detail':169 'doc':152 'document':92,147 'endpoint':32,49,75,140,188 'equal':137 'exact':88 'exampl':181 'exploratori':211 'extrem':149 'financ':61 'function':89 'infrastructur':64 'json-response' 'keyless':100 'keyless api access' 'know':197 'label':78,95 'learn':60 'limit':104 'live':191 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'mani':48 'materi':186 'maxamountrequir':125 'model':105 'network':115 'no-api-key' 'no-rate-limit':101 'offer':50 'one':46 'openapi':173 'page':157 'particular':203 'path':204 'pay':2,17,107 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request' 'payment':42 'per':3,18,71,108 'platform':53,97 'post':142 'post-method' 'premium':5,20,36,79 'price':68,154 'prompt':164 'protocol':43 'provid':35,205 'rate':103 'readm':156 'render':159 'request':72,109,143 'request/response':176 'return':145,194 'schema':177 'servic':201 'span':55 'spars':150 'spec':174 'specif':74 'technic':168 'treat':208 'unit':130 'usag':180 'usdc':15,30,111,136 'usdc-base-network' 'use':110 'util':65 'via':10,25,39 'wallet':163 'web3':62 'without':196 'x402':11,26,41,84,121 'x402 api' 'x402-payment'","prices":[{"id":"ad346fde-3b1c-45aa-b8ee-ec4d7503e002","listingId":"68b6082a-307a-4b78-9a95-f62f2e500c20","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/payments/211","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:48.561Z"}],"sources":[{"listingId":"68b6082a-307a-4b78-9a95-f62f2e500c20","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/211","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:48.561Z","lastSeenAt":"2026-04-23T16:07:16.342Z"}],"details":{"listingId":"68b6082a-307a-4b78-9a95-f62f2e500c20","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/211 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/211"},{"claim":"All 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/211"}],"useCases":["Accessing premium API functionality without API key registration","Making one-off paid API calls settled in USDC on Base","Exploring x402 protocol-based pay-per-request services"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC micropayments on Base","Users who want keyless, commitment-free API access"],"notFor":["Users needing detailed API documentation before calling","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-call pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.872Z"},"updatedAt":"2026-04-23T16:07:16.342Z"}}