{"id":"4d6ba6bc-1fe4-4dfd-9f9b-08a4168ade4b","shortId":"jEGqb6","kind":"x402","title":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 protocol at $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 on the platform, which offers a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities—all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/318` accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The platform advertises no API keys, no rate limits, and instant access.\n\nNote that while the platform lists many endpoints (sentiment analysis, summarization, price feeds, geocoding, etc.), the specific functionality of `/api/v1/transactions/318` is not documented beyond the generic label \"Premium API Access.\" There is no OpenAPI schema, no detailed documentation, and no example responses available from the crawled pages. The docs, pricing, and API pages all appear to require wallet connection and provide no additional content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid endpoint","402 payment required"],"warnings":["No documentation available for this specific endpoint's functionality or response format","Docs, pricing, and API pages require wallet connection and show no content","The purpose of /api/v1/transactions/318 is not explained—it may be a generic or placeholder endpoint","No OpenAPI schema or output schema details provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/318","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/318","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 via 402 challenge with clear pricing ($0.02 USDC on Base), but there is no documentation of what the endpoint actually returns, no OpenAPI schema, no example requests/responses, and the specific purpose of '/api/v1/transactions/318' is unclear beyond the generic 'Premium API Access' 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'/request':15,32 '0.02':14,31,77,125 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '20':119 '402 payment required' '6':130 'Base network API' 'USDC micropayment API' 'accept':91 'access':7,24,42,149,179 'addit':212 'address':134 'advertis':140 'ai':66 'analysi':159 'analyt':65 'api':6,23,41,62,142,178,201 'appear':204 'avail':192 'base':9,26,85,121,137 'base-network' 'beyond':173 'call':4,21 'challeng':109 'confirm':110 'connect':208 'contain':101 'content':213 'crawl':195 'crypto-paid endpoint' 'data':64 'decim':131 'detail':186 'doc':198 'document':172,187 'endpoint':36,53,89,112,157 'etc':164 'exampl':190 'feed':162 'financ':69 'function':167 'generic':175 'geocod':163 'header':100 'http-post' 'infrastructur':72 'instant':148 'key':143 'label':176 'learn':68 'limit':146 'list':155 'live':114 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':67 'mani':52,156 'maximum':117 'network':86 'no-api-key' 'note':150 'offer':58 'one':50 'openapi':183 'page':196,202 'paid':132 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':46,99,105 'per':3,20,78 'platform':56,139,154 'post':92 'premium':5,22,40,177 'price':75,161,199 'proof':106 'protocol':12,29,47 'provid':39,210 'rate':145 'request':79,93,115 'requir':95,206 'respons':191 'schema':184 'sentiment':158 'settl':80 'sinc':127 'span':63 'specif':88,166 'suit':60 'summar':160 'unit':122 'usd':126 'usdc':17,34,82,124,128 'usdc-settlement' 'use':129 'util':73 'valid':103 'via':10,27,43 'wallet':207 'web3':70 'x':98 'x-payment':97 'x402':11,28,45,104,108 'x402 API' 'x402-payment'","prices":[{"id":"3bd448b1-d127-4c8b-9446-1d92a1640152","listingId":"4d6ba6bc-1fe4-4dfd-9f9b-08a4168ade4b","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/318","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:56.182Z"}],"sources":[{"listingId":"4d6ba6bc-1fe4-4dfd-9f9b-08a4168ade4b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/318","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:56.182Z","lastSeenAt":"2026-04-22T13:31:49.841Z"}],"details":{"listingId":"4d6ba6bc-1fe4-4dfd-9f9b-08a4168ade4b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/318 \\\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 requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/318"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/318"}],"useCases":["Accessing premium API services without traditional API key registration","Making one-off paid API calls settled instantly in USDC on Base","Agent-driven workflows requiring permissionless pay-per-use endpoints"],"bestFor":["Developers wanting keyless, pay-per-request API access","AI agents that can autonomously pay for API calls via x402","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed documentation or guaranteed SLAs","Applications requiring free or subscription-based pricing models","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.314Z"},"updatedAt":"2026-04-22T13:31:49.841Z"}}