{"id":"f44c2f94-5cae-41fd-afae-c6b781683f23","shortId":"XsJuvh","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/transactions/276` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: 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.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/276` endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality this specific transaction endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","crypto API payments"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or output schema describing request parameters or response format","The specific endpoint /api/v1/transactions/276 is not listed among the advertised APIs on the homepage","Purpose of this endpoint is entirely unclear — 'Premium API Access' is a generic label"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/276","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/276","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and all doc pages render only 'Connect wallet'. The specific endpoint path (/api/v1/transactions/276) is not listed on the homepage, making its purpose 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'/api/v1/transactions/276':57,189 '/docs':158 '/pricing':160 '/readme':162 '/request':13,28 '0.02':12,27,78,150 '000':73 '20':72 '402':67,197 'Base network API' 'USDC pay-per-call' 'accept':46 'access':63,93 'across':109 'actual':191 'advertis':84 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,62,86 'attach':96 'base':8,23,51,74 'broader':105 'call':4,19,81 'categori':111 'challeng':68,198 'classif':126 'confirm':199 'connect':168 'content':174 'convers':143 'crypto API payments' 'data':112,116,207 'descript':185 'document':153,202 'embed':127 'endpoint':55,108,146,190,194,213 'estim':137 'exampl':182 'exchang':132 'export':117 'extrem':155 'feed':131 'financ':128 'four':110 'function':209 'gas':136 'generat':144 'geocod':141 'header':100 'infrastructur':139 'insight':118 'instant':92 'json-response' 'key':87 'learn':121 'limit':90 'list':59 'live':196 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'metric':114 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':107 'openapi':178 'page':163 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99 'per':3,18,36,80,151 'platform':6,21,39,83,106 'post-method' 'premium':61 'price':130,148 'prompt':170 'protocol':44 'provid':214 'quot':135 'rate':89,133 'render':165 'report':115 'request':37,69,103,152 'request/response':181 'return':65,192 'schema':179 'sentiment':122 'simpli':95 'spars':156 'specif':54,211 'summar':125 'text':124 'token':134 'transact':212 'unclear':205 'unit':75 'usd':79 'usdc':15,30,47,77 'usdc-base-network' 'use':41 'util':140 'valid':142 'via':10,25 'wallet':169 'web3':129 'without':201 'x402':11,26,43,98 'x402 API' 'x402-payment'","prices":[{"id":"7e251137-016b-4e01-bd29-50c3377f4d40","listingId":"f44c2f94-5cae-41fd-afae-c6b781683f23","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/276","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:57.064Z"}],"sources":[{"listingId":"f44c2f94-5cae-41fd-afae-c6b781683f23","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/276","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:57.064Z","lastSeenAt":"2026-04-23T14:31:35.039Z"}],"details":{"listingId":"f44c2f94-5cae-41fd-afae-c6b781683f23","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/276 \\\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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/276"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/276"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without subscription or API key management","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access with crypto payment"],"bestFor":["Developers who want pay-per-use API access without sign-up","AI agents that can attach x402 payment headers autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.858Z"},"updatedAt":"2026-04-23T14:31:35.039Z"}}