{"id":"51d20916-0b05-48d2-8973-be5900f2912c","shortId":"aqUS5m","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. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/27` is listed under the site's premium access tier. It accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. The maximum amount required is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, 6 decimals), which equals $0.02 USD per call. There are no API keys, no rate limits, and no subscription commitments — access is purely pay-per-use.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. The exact response format and functionality of this particular `/transactions/27` endpoint is not documented beyond the generic \"Premium API Access\" label. Without further documentation it is unclear what data or service this specific endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — docs/pricing/README pages only show 'Connect wallet'","The exact functionality of /api/v1/transactions/27 is unknown; 'Premium API Access' is the only descriptor","No OpenAPI schema, no example responses, no input schema beyond POST method","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/27","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/transactions/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is virtually no documentation about what this endpoint actually does, what inputs it accepts, or what it returns. The docs pages are empty beyond a wallet-connect 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'/request':13,28 '/transactions/27':182 '0.02':12,27,69,127 '000':115 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':114 '6':123 'Base network API' 'USDC micropayment API' 'accept':93 'access':7,22,38,90,143,192 'addit':170 'ai/ml':58 'amount':111 'analyt':57 'api':6,21,37,54,134,156,191 'base':9,24,77,116,122 'base-network' 'beyond':187 'call':4,19,130 'collect':48 'commit':142 'connect':165 'contain':103 'crypto-paid endpoint' 'data':56,62,201 'decim':124 'detail':172 'doc':155 'document':150,186,196 'endpoint':32,81,183,206 'equal':126 'exact':174 'extrem':152 'financ':60 'format':176 'function':178 'generic':189 'header':102 'host':46 'infer':59 'infrastructur':64 'key':135 'label':193 'limit':138 'list':84 'lowpaymentfee' 'lowpaymentfee.com':34 'maximum':110 'network':78 'no-api-key' 'page':160 'particular':181 'pay':2,17,51,147 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':50 'pay-per-us':146 'payment':42,101,107 'per':3,18,52,70,129,148 'post':94 'post-method' 'premium':5,20,36,89,190 'premium API access' 'price':67,157 'prompt':167 'proof':108 'protocol':43 'provid':35 'pure':145 'rate':137 'readm':159 'render':162 'request':53,71,95 'requir':97,112 'respons':175 'return':207 'servic':203 'settl':72 'site':45,87 'span':55 'spars':153 'specif':80,205 'subscript':141 'technic':171 'tier':91 'unclear':199 'unit':117 'usd':128 'usdc':15,30,74,119 'usdc-settlement' 'use':149 'util':65 'valid':105 'via':10,25,39 'wallet':166 'web3':61 'without':194 'x':100 'x-payment':99 'x402':11,26,41,106 'x402 API' 'x402-payment'","prices":[{"id":"2d19cee4-6ce3-4dda-8884-8d71c191859e","listingId":"51d20916-0b05-48d2-8973-be5900f2912c","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/transactions/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:38.420Z"}],"sources":[{"listingId":"51d20916-0b05-48d2-8973-be5900f2912c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:38.420Z","lastSeenAt":"2026-04-22T13:31:48.447Z"}],"details":{"listingId":"51d20916-0b05-48d2-8973-be5900f2912c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/27 \\\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":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/27"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/27"}],"useCases":["Accessing premium data or services without subscription or API key management","Agent-driven pay-per-call workflows settled on-chain in USDC","Programmatic access to gated resources using x402 payment headers"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer on-chain micropayments over traditional billing"],"notFor":["Users needing detailed API documentation before integrating","High-volume use cases where per-request pricing at $0.02 adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.633Z"},"updatedAt":"2026-04-22T13:31:48.447Z"}}