{"id":"10d144fa-b41e-4a8b-9adb-d4cce04303de","shortId":"4V4dhH","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no sign-up required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/124` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including 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, no OpenAPI schema, request/response examples, or detailed documentation were found during crawling; the docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. The exact behavior and input/output format of the `/api/v1/messages/124` endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base-settlement","no-api-key","analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","cheap api","no-auth api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact purpose and input/output format of /api/v1/messages/124 is unknown — 'Premium API Access' is the only description","Docs, pricing, and README pages return no content (just 'Connect wallet')","No rate-limit or SLA information provided","Cannot verify that the advertised AI, finance, and utility endpoints are actually functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/124","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/messages/124","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs/pricing/README pages are all blank beyond a wallet-connect prompt. The purpose of the specific /messages/124 endpoint is unclear. Score reflects a working payment gate with almost no usable 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'/request':18,36 '0.02':17,35,67,136,184 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x8335':130 '20':124 '2913':131 '300':151 '6':140 'accept':113 'access':111 'addit':158 'address':147 'advertis':119,157 'ai':12,30 'ai-inference' 'ai/ml':55 'analysi':162 'analyt':11,29,54 'analytics' 'api':5,23,43,80,110 'attach':93 'avail':230 'base':8,26,75,126,133 'base network api' 'behavior':219 'broad':48 'broader':155 'call':4,22 'caller':91 'challeng':118 'cheap api' 'classif':165 'classification' 'collect':49 'connect':210 'content':216 'convers':177 'cost':122 'cover':10,28 'crawl':199 'crypto-data' 'data':53,58 'decim':141 'detail':194 'doc':201 'document':195 'embed':166 'embeddings' 'enabl':42 'endpoint':51,63,103,159,226 'equal':135 'estim':174 'everi':62 'exact':218 'exampl':192 'exchang':169 'feed':168 'financ':13,31 'finance-data' 'finance/web3':57 'format':222 'found':197 'gas':173 'general':60 'generat':179 'geocod':175 'geocoding' 'given':137 'header':97 'howev':187 'includ':160 'infer':56 'input/output':221 'key':81 'limit':84 'list':107 'low payment fee' 'lowpaymentfee.com':37 'materi':231 'maximum':121 'micropayment api' 'network':76 'no-api-key' 'no-auth api' 'offer':46 'openapi':189 'page':205 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'payment':96,143 'per':3,21,68 'per-request-pricing' 'platform':44,156 'point':186 'post':114 'premium':109 'price':65,167,185,202 'prompt':212 'quot':172 'rate':83,170 'readm':204 'request':69,100,115 'request/response':191 'requir':90 'return':207 'schema':190 'second':152 'sent':145 'sentiment':161 'sentiment-analysis' 'settl':70 'sign':88 'sign-up':87 'simpli':92 'span':52 'specif':102 'substant':215 'suit':6,24 'summar':164 'text':163 'text-summarization' 'timeout':153 'token':171 'unclear':228 'unit':127 'usdc':9,27,72,129,138 'usdc api' 'usdc-base-settlement' 'util':15,33,61 'utility-apis' 'valid':176 'wallet':211 'x402':41,95,117 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"fbbe8e56-c35d-4645-9a6c-62740223b20b","listingId":"10d144fa-b41e-4a8b-9adb-d4cce04303de","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/messages/124","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.857Z"}],"sources":[{"listingId":"10d144fa-b41e-4a8b-9adb-d4cce04303de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/124","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.857Z","lastSeenAt":"2026-04-22T02:32:05.937Z"}],"details":{"listingId":"10d144fa-b41e-4a8b-9adb-d4cce04303de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/124 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/124"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval with automatic per-call USDC micropayments","On-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates via x402","Geocoding and data conversion utilities paid per request"],"bestFor":["Developers and agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime","Users who need detailed API documentation and typed schemas before integrating","Callers without a Base-network USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.928Z"},"updatedAt":"2026-04-22T02:32:05.937Z"}}