{"id":"ebb6de2d-12f1-4afa-8966-414a97b27fb2","shortId":"jEvg9e","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 set 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/175` 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 crawled site does not list a `/api/v1/transactions/175` route among its documented endpoints, and the site's documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content. As a result, the actual functionality behind this specific endpoint is unclear — it may be a generic transaction endpoint or a placeholder.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. All are priced uniformly at $0.02 per request. The x402 challenge is live and well-formed, confirming the endpoint is operational at the protocol level.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-platform","finance","ai"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The endpoint /api/v1/transactions/175 is not listed among the site's documented APIs — its actual functionality is unclear.","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content.","No OpenAPI schema, request/response examples, or detailed documentation available.","The broader platform lists many endpoint categories but none match this specific path."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/175","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/175","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 well-formed, confirming the endpoint works at the protocol level. However, the specific endpoint /api/v1/transactions/175 is not documented anywhere on the site, no OpenAPI schema exists, documentation pages are empty (just 'Connect wallet'), and there are no request/response examples. The actual functionality of this endpoint is 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'/api/v1/transactions/175':96,140 '/docs':152 '/pricing':153 '/readme':155 '/request':13,28 '0.02':12,27,64,115,118,224 '000':110 '20':109 'Base network API' 'USDC micropayment API' 'accept':126 'access':102 'account':76 'actual':171 'advertis':104,192 'ai/ml':49 'among':142 'analysi':201 'analyt':48 'api':5,20,37,74,101 'application/json':131 'attach':84 'base':8,23,71,111 'base-network' 'behind':173 'broad':42 'broader':190 'call':4,19,120 'caller':82 'categori':193 'challeng':123,229 'classif':204 'confirm':124,236 'connect':160 'content':166 'convers':216 'cost':107 'crawl':134 'crypto-paid API' 'data':47,52,197 'document':144,150 'embed':205 'enabl':36 'endpoint':45,57,94,145,176,185,238 'estim':213 'exchang':208 'export':198 'feed':207 'finance/web3':51 'form':235 'function':172 'gas':212 'generat':218 'generic':183 'geocod':214 'header':88 'howev':132 'i.e':117 'includ':194 'infer':50 'insight':199 'json-response' 'key':75 'level':244 'limit':79 'list':98,138 'live':231 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'max':106 'may':180 'metric':195 'network':9,24,72 'no-api-key' 'offer':40 'oper':240 'page':151 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87 'per':3,18,61,119,225 'placehold':188 'platform':6,21,38,191 'post':127 'post-method' 'premium':100 'price':206,221 'prompt':162 'protocol':243 'quot':211 'rate':78,209 'report':196 'request':62,91,128,226 'requir':81 'result':169 'return':130,157 'rout':141 'sentiment':200 'servic':55 'set':43 'settl':66 'simpli':83 'site':135,148 'span':46 'specif':93,175 'substant':165 'summar':203 'text':202 'token':210 'transact':184 'unclear':178 'uniform':222 'unit':112 'usdc':15,30,68,114,116 'usdc-settlement' 'util':54 'valid':215 'via':10,25 'wallet':161 'well':234 'well-form':233 'x402':11,26,35,86,122,228 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"3945b43d-6b28-4d70-8fc9-42c48f347edd","listingId":"ebb6de2d-12f1-4afa-8966-414a97b27fb2","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/175","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:58.228Z"}],"sources":[{"listingId":"ebb6de2d-12f1-4afa-8966-414a97b27fb2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/175","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:58.228Z","lastSeenAt":"2026-04-22T13:31:46.593Z"}],"details":{"listingId":"ebb6de2d-12f1-4afa-8966-414a97b27fb2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/175 \\\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 are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transactions/175 advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/175"},{"claim":"Payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/175"}],"useCases":["Accessing API services without creating an account or managing API keys","Making one-off paid API calls from autonomous agents using x402 protocol","Paying for API access with USDC on Base L2 for low transaction fees"],"bestFor":["Developers wanting frictionless, keyless API access via crypto micropayments","AI agents that need to autonomously purchase API calls on-chain","Users who prefer pay-per-use pricing with no subscriptions or commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.525Z"},"updatedAt":"2026-04-22T13:31:46.593Z"}}