{"id":"76d642da-f35c-4b13-9164-71d00946fdaf","shortId":"AW2mQA","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/204` is listed as \"Premium API Access\" and advertises a max cost of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The x402 challenge confirms it accepts POST requests and returns application/json. However, the exact functionality of this particular transactions endpoint is not documented in the crawled material — the site's landing page lists analytics, AI, finance, and utility endpoints but does not describe a `/transactions/204` route.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas for any endpoint are unavailable.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","no-api-key","no-rate-limits"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["The /api/v1/transactions/204 endpoint is not listed on the site's landing page catalog — its specific functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available for any endpoint.","The broader platform lists many endpoint categories but none of them could be verified for actual functionality from the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/204","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/204","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but the specific /transactions/204 endpoint has no documentation. All docs pages beyond the landing page returned only 'Connect wallet' with no content. No request/response schemas, no examples, and the purpose of this particular endpoint is 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'/request':13,28 '/transactions/204':165 '0.02':12,27,64,115,118,196 '000':110 '20':109 'Base network API' 'USDC API' 'accept':126 'access':102 'account':76 'advertis':104,170 'ai':155 'ai/ml':49 'analysi':174 'analyt':48,154 'api':5,20,37,74,101 'application/json':131 'attach':84 'base':8,23,71,111 'base-network' 'beyond':201 'broad':42 'broader':168 'call':4,19,120 'caller':82 'catalog':43 'challeng':123 'classif':177 'confirm':124 'connect':208 'content':214 'convers':189 'cost':107 'crawl':146 'data':47,52 'describ':163 'detail':216 'document':143,199 'embed':178 'enabl':36 'endpoint':45,57,94,140,159,171,221 'estim':186 'exact':134 'exchang':181 'feed':180 'financ':156 'finance/web3':51 'function':135 'gas':185 'generat':191 'geocod':187 'header':88 'howev':132 'i.e':117 'infer':50 'json-api' 'key':75 'land':151,203 'limit':79 'list':98,153 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':147 'max':106 'micropayment API' 'network':9,24,72 'no-api-key' 'no-rate-limits' 'offer':40 'page':152,200,204 'particular':138 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87 'per':3,18,61,119 'platform':6,21,38,169 'point':198 'post':127 'premium':100 'price':179,197 'prompt':210 'quot':184 'rate':78,182 'request':62,91,128 'request/response':217 'requir':81 'return':130,205 'rout':166 'schema':218 'sentiment':173 'servic':55 'settl':66 'simpli':83 'site':149 'span':46 'specif':93 'substant':213 'summar':176 'text':175 'token':183 'transact':139 'unavail':223 'unit':112 'usdc':15,30,68,114,116 'usdc-settlement' 'util':54,158 'valid':188 'via':10,25 'wallet':209 'x402':11,26,35,86,122 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"384546d4-dc20-42f4-a51d-86b5ea73bb62","listingId":"76d642da-f35c-4b13-9164-71d00946fdaf","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/204","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:04.210Z"}],"sources":[{"listingId":"76d642da-f35c-4b13-9164-71d00946fdaf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/204","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:04.210Z","lastSeenAt":"2026-04-23T19:01:45.684Z"}],"details":{"listingId":"76d642da-f35c-4b13-9164-71d00946fdaf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/204 \\\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":"All endpoints priced at $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/204"},{"claim":"Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/transactions/204"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Programmatic access to utility or data endpoints with per-call crypto payment","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.262Z"},"updatedAt":"2026-04-23T19:01:45.684Z"}}