{"id":"8e24c077-4569-455f-8f9d-70c737312458","shortId":"eqvjvV","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 site hosts a collection of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities, all priced at $0.02 per request paid in USDC (USD Coin) with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/transactions/357` is listed under the provider's umbrella of pay-per-call services. The x402 challenge confirms it accepts POST requests, settles on Base using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), and charges a maximum of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no description of what the `/api/v1/transactions/357` endpoint actually returns. The endpoint is live (402 challenge confirmed), but the lack of documentation makes it difficult to determine the exact functionality beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","transactions endpoint"],"warnings":["No documentation available — docs/pricing/API pages only show 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific endpoint /api/v1/transactions/357 is not listed among the site's advertised APIs","Functionality behind 'Premium API Access' is completely unspecified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/357","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/357","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live with a valid 402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no request/response schema, no explanation of what the endpoint returns. The specific resource path (/transactions/357) is not listed on the homepage, making its purpose 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'/request':13,28 '0.02':12,27,69,128 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20':123 '300':143 '402':190 '6':132 'Base network API' 'USDC micropayment API' 'accept':108 'access':7,22,38,211 'actual':184 'address':139 'ai':58 'analyt':57 'api':6,21,37,54,79,154,210 'base':9,24,46,113,125 'base-network' 'beyond':206 'call':4,19,101 'challeng':105,191 'charg':119 'coin':76 'collect':52 'commit':84 'confirm':106,192 'connect':160 'contract':116 'crypto-paid API' 'data':56 'decim':133 'descript':178 'detail':167 'determin':202 'difficult':200 'direct':137 'doc':151 'document':146,197 'endpoint':32,88,183,187 'exact':204 'extrem':148 'financ':61 'function':205 'generic':208 'given':129 'host':50 'i.e':127 'infrastructur':64 'key':80 'label':212 'lack':195 'learn':60 'limit':82 'list':91 'live':189 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'make':198 'maximum':121 'network':47 'no-api-key' 'openapi':171 'page':155 'paid':72 'pay':2,17,99 'pay-per-cal':1,16,98 'pay-per-call API' 'pay-per-request' 'payment':42,135 'per':3,18,70,100 'post':109 'post-method' 'premium':5,20,36,209 'price':67,152 'prompt':162 'protocol':43 'provid':35,94 'rate':81 'render':157 'request':71,110 'request/response':174 'requir':85 'return':185 'schema':175 'second':144 'servic':102 'settl':111 'site':49 'span':55 'spars':149 'spec':172 'specif':87 'technic':166 'timeout':145 'transactions endpoint' 'umbrella':96 'unit':126 'usd':75 'usdc':15,30,74,115,130 'usdc-settlement' 'use':114 'util':65 'via':10,25,39 'wallet':161 'web3':62 'x402':11,26,41,104 'x402 API' 'x402-payment'","prices":[{"id":"8d8c8515-f15d-437e-b897-27e5f9873363","listingId":"8e24c077-4569-455f-8f9d-70c737312458","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/357","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:18.015Z"}],"sources":[{"listingId":"8e24c077-4569-455f-8f9d-70c737312458","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/357","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:18.015Z","lastSeenAt":"2026-04-24T08:03:43.702Z"}],"details":{"listingId":"8e24c077-4569-455f-8f9d-70c737312458","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/357 \\\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 site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units in USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/357"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/357"}],"useCases":["Accessing premium data or transaction information via a single paid API call","Integrating pay-per-use API access into agent workflows without managing API keys","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Low-volume consumers who prefer per-request billing over subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.381Z"},"updatedAt":"2026-04-24T08:03:43.702Z"}}