{"id":"55e23772-f497-44ca-bbdd-f92b6e6fd70a","shortId":"hMSGgf","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 on the Base network. The specific endpoint `/api/v1/transactions/147` accepts POST requests and charges 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02 per request given USDC's 6 decimals.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories including 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 endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific functionality of the `/api/v1/transactions/147` endpoint is unclear — it is listed as \"Premium API Access\" without further documentation about what data or service it returns. The docs, pricing, and API pages on the site only show a \"Connect wallet\" prompt with no additional technical documentation. The endpoint is confirmed live via a valid 402 challenge response, settling payments in USDC on Base with a 300-second timeout.","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 endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet'","The specific functionality of /api/v1/transactions/147 is undocumented","No request or response schema provided","No OpenAPI spec or AI plugin manifest available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/147","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/147","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge, but there is no documentation about what the endpoint actually returns, no request/response schema, and the docs pages are empty beyond a wallet connect prompt. The specific purpose of /api/v1/transactions/147 is 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'/request':13,28 '0.02':12,27,66,121 '000':58 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':63 '20':57 '300':201 '402':190 '6':72 'Base network API' 'USDC micropayment endpoint' 'accept':52 'access':7,22,38,151 'addit':179 'advertis':78 'ai':90 'analysi':94 'analyt':84 'api':6,21,37,80,126,150,166 'base':9,24,46,59,198 'base-network' 'broader':75 'call':4,19 'categori':81 'challeng':191 'charg':56 'classif':97 'commit':134 'confirm':185 'connect':174 'convers':114 'crypto-paid API' 'data':83,87,157 'decim':73 'doc':163 'document':154,181 'embed':98 'endpoint':32,50,117,142,183 'equal':65 'estim':108 'exchang':103 'export':88 'feed':102 'financ':99 'function':138 'gas':107 'generat':115 'geocod':112 'given':69 'includ':82 'infrastructur':110 'insight':89 'key':127 'learn':92 'limit':130 'list':147 'live':186 'lowpaymentfee' 'lowpaymentfee.com':34,76 'machin':91 'metric':85 'minimum':133 'multipl':79 'network':47 'no-api-key' 'page':167 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,194 'per':3,18,67,122 'platform':77 'post':53 'post-method' 'premium':5,20,36,149 'premium API access' 'price':101,119,164 'prompt':176 'protocol':43 'provid':35 'quot':106 'rate':104,129 'report':86 'request':54,68,123 'requir':135 'respons':192 'return':161 'second':202 'sentiment':93 'servic':159 'settl':193 'show':172 'site':170 'specif':49,137 'summar':96 'technic':180 'text':95 'timeout':203 'token':105 'unclear':144 'unit':60 'usdc':15,30,62,70,196 'usdc-settlement' 'util':111 'valid':113,189 'via':10,25,39,187 'wallet':175 'web3':100 'without':152 'x402':11,26,41 'x402 API' 'x402-payment'","prices":[{"id":"4c54ef22-4193-48d6-b23a-12c74f38a9f6","listingId":"55e23772-f497-44ca-bbdd-f92b6e6fd70a","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/147","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:43.071Z"}],"sources":[{"listingId":"55e23772-f497-44ca-bbdd-f92b6e6fd70a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/147","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:43.071Z","lastSeenAt":"2026-04-22T13:31:45.623Z"}],"details":{"listingId":"55e23772-f497-44ca-bbdd-f92b6e6fd70a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/147 \\\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":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/147"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/147"}],"useCases":["Accessing premium API services without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-use endpoints into agent workflows without subscriptions"],"bestFor":["Developers who want instant API access without signup","Agents that can settle x402 payments autonomously on Base","Users preferring crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation before purchasing","High-volume use cases where per-request pricing may add up","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.289Z"},"updatedAt":"2026-04-22T13:31:45.623Z"}}