{"id":"4de5e189-c500-4f4e-a831-02bfb1ce6d5d","shortId":"qNXJxn","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/337` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The actual functionality behind this specific `/api/v1/transactions/337` endpoint and the other listed endpoints cannot be verified from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unknown","Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content","The purpose of /api/v1/transactions/337 ('Premium API Access') is not explained anywhere","Cannot verify what data or service any of the listed endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/337","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/337","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of this specific endpoint is undescribed. Effectively a stub 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'/request':13,28 '0.02':12,27,59,133,179 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':128 '20':121 '300':147 '402 payment api' '6':137 'accept':111 'access':109 'across':45 'actual':220 'address':143 'advertis':117,153 'ai/ml':48 'analysi':157 'analyt':47 'api':5,20,37,71,108,189 'asset':127 'attach':87 'avail':218 'base':8,23,67,123,130 'base network api' 'behind':222 'broader':151 'call':4,19 'caller':86 'cannot':232 'challeng':116 'classif':160 'commit':78 'connect':198 'convers':172 'crawl':237 'data':46 'decim':138 'detail':205 'doc':188 'document':183,214 'embed':161 'enabl':36 'endpoint':44,55,101,154,226,231 'equal':132 'estim':169 'exampl':217 'exchang':164 'extrem':185 'feed':163 'finance/web3':50 'fulfil':94 'function':221 'gas':168 'generat':174 'geocod':170 'given':134 'handl':83 'header':90 'howev':182 'infer':49 'infrastructur':52 'inlin':85 'json-response' 'key':72 'limit':75 'list':105,230 'low payment fee' 'lowpaymentfee.com':31 'materi':238 'maxamountrequir':119 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':209 'page':193 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':84,89,139 'per':3,18,60 'platform':6,21,38,152 'point':181 'post':112 'post-endpoint' 'premium':107 'price':57,162,180,190 'prompt':200 'protocol':82 'quot':167 'rate':74,165 'readm':192 'render':195 'request':61,96,113 'request/response':212 'requir':79 'schema':213 'second':148 'sent':141 'sentiment':156 'server':93 'spars':186 'spec':210 'specif':100,224 'summar':159 'technic':204 'text':158 'timeout':149 'token':166 'unit':124 'upon':97 'usdc':15,30,64,126,135 'usdc api' 'usdc-base-network' 'util':53 'valid':171 'varieti':42 'verif':98 'verifi':234 'via':10,25 'wallet':199 'x402':11,26,35,81,115 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"debe449e-01c9-47ab-ba8e-b030154ba7bc","listingId":"4de5e189-c500-4f4e-a831-02bfb1ce6d5d","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/337","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:13.172Z"}],"sources":[{"listingId":"4de5e189-c500-4f4e-a831-02bfb1ce6d5d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/337","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:13.172Z","lastSeenAt":"2026-04-23T11:31:27.430Z"}],"details":{"listingId":"4de5e189-c500-4f4e-a831-02bfb1ce6d5d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/337 \\\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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/337"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, keyless API access","AI agents that can settle x402 payments autonomously on Base","Users comfortable paying in USDC on the Base L2 network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring fiat payment rails or non-crypto settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.567Z"},"updatedAt":"2026-04-23T11:31:27.430Z"}}