{"id":"7198e71c-7ffe-4fbe-acf2-1ed137a7e4b2","shortId":"tmswpz","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 variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header and the server fulfills the request upon verification.\n\nThe specific endpoint at `/api/v1/transactions/229` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. Beyond this particular endpoint, the platform advertises categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind \"Premium API Access\" at this specific transaction endpoint is unclear — it may be a generic transaction record or a demonstration endpoint. Without documentation or schema details, callers must discover behavior experimentally.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","ai"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API access","402 payment protocol"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema specification found","The purpose and response format of /api/v1/transactions/229 ('Premium API Access') is undocumented and unclear","Cannot verify what data or service this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/229","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/229","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, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what 'Premium API Access' at /api/v1/transactions/229 actually returns. The listing is effectively a 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'/api/v1/transactions/229':103 '/docs':183 '/pricing':184 '/readme':187 '/request':13,28 '0.02':12,27,59,130,175 '000':119 '0x8335':124 '20':118 '2913':125 '402':113 '402 payment protocol' '6':134 'Base network API' 'USDC pay-per-call' 'accept':138 'access':109,220 'across':45 'actual':215 'advertis':150 'ai/ml':48 'analysi':154 'analyt':47 'api':5,20,37,71,108,219 'application/json':143 'attach':87 'avail':213 'base':8,23,67,120,127 'behavior':247 'behind':217 'beyond':144 'call':4,19 'caller':86,244 'categori':151 'challeng':114 'classif':157 'commit':78 'connect':193 'content':199 'convers':167 'crypto API access' 'data':46,169 'decim':135 'demonstr':237 'detail':243 'discov':246 'document':178,208,240 'embed':158 'enabl':36 'endpoint':44,55,101,137,147,225,238 'equal':129 'estim':164 'exampl':211 'exchang':161 'experiment':248 'export':170 'extrem':180 'feed':160 'finance/web3':50 'fulfil':94 'function':216 'gas':163 'generic':232 'geocod':165 'given':131 'handl':83 'header':90 'includ':152 'infer':49 'infrastructur':52 'inlin':85 'json-response' 'key':72 'limit':75 'list':105 'lowpaymentfee' 'lowpaymentfee.com':31 'may':229 'micropayment API' 'must':245 'network':9,24,68 'no-api-key' 'offer':40 'openapi':203 'page':188 'paid':62 'particular':146 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payload':212 'payment':84,89 'per':3,18,60 'platform':6,21,38,149 'point':177 'post':139 'post-method' 'premium':107,218 'price':57,159,176 'prompt':195 'protocol':82 'rate':74,162 'record':234 'render':190 'request':61,96,115,140 'request/response':206 'requir':79 'return':111,142 'schema':207,242 'sentiment':153 'server':93 'spars':181 'spec':204 'specif':100,223 'summar':156 'text':155 'transact':224,233 'unclear':227 'unit':121 'upon':97 'usdc':15,30,64,123,132 'usdc-base-network' 'util':53 'valid':166 'varieti':42 'verif':98 'via':10,25 'wallet':194 'without':239 'x402':11,26,35,81 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ba2f6423-b9c2-4dae-b961-be8449ee8d7d","listingId":"7198e71c-7ffe-4fbe-acf2-1ed137a7e4b2","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/229","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:19.903Z"}],"sources":[{"listingId":"7198e71c-7ffe-4fbe-acf2-1ed137a7e4b2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/229","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:19.903Z","lastSeenAt":"2026-04-22T11:32:21.033Z"}],"details":{"listingId":"7198e71c-7ffe-4fbe-acf2-1ed137a7e4b2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/229 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/229"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-call API endpoints without traditional API key registration","Making one-off API requests paid in USDC on Base L2","Programmatic agent-driven API consumption with inline crypto payments"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.575Z"},"updatedAt":"2026-04-22T11:32:21.033Z"}}