{"id":"747dde9a-2147-4215-86d7-02612b60aa4a","shortId":"6kSm5w","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, payable 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 an X-PAYMENT header with a signed USDC payment to each request.\n\nThe specific endpoint at `/api/v1/charges/314` 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 payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\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 data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse (docs, pricing, and API pages all render only a \"Connect wallet\" prompt), so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) are all empty beyond a 'Connect wallet' prompt — no usable API documentation exists.","The specific functionality of /api/v1/charges/314 ('Premium API Access') is not described anywhere; it may be a generic or placeholder endpoint.","No OpenAPI spec, no request/response schemas, and no example payloads are available.","The platform lists many endpoints on its landing page but none have documented schemas or behavior."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/314","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/charges/314","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 payment details. However, documentation is essentially absent — the docs, pricing, and API pages all show only 'Connect wallet' with no schema, example payloads, or response formats. The specific purpose of '/api/v1/charges/314' beyond 'Premium API Access' is unclear, and no input/output schemas are 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'/request':13,28 '0.02':12,27,59,132,186 '000':121 '0x8335':126 '20':120 '2913':127 '300':145 '402':115 '402 payment api' '6':136 'accept':150 'access':111 'across':45 'actual':212 'advertis':159 'ai/ml':48 'analysi':163 'analyt':47 'api':5,20,37,71,110,201 'application/json':155 'attach':87 'base':8,23,67,122,129 'base network api' 'beyond':191 'broader':157 'call':4,19 'caller':86 'challeng':116 'classif':166 'commit':78 'connect':207 'convers':178 'data':46,180 'decim':137 'doc':198 'document':190 'embed':167 'enabl':36 'endpoint':44,55,103,149,160,217 'equal':131 'estim':175 'exact':142 'exchang':170 'extrem':196 'feed':169 'finance/web3':50 'gas':174 'generat':181 'geocod':176 'given':133 'handl':83 'header':92 'howev':189 'individu':216 'infer':49 'infrastructur':52 'inlin':85 'json-response' 'key':72 'land':193 'limit':75 'list':107 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'page':194,202 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':62 'payment':84,91,97,139 'per':3,18,60 'platform':6,21,38,158 'point':188 'post':151 'post-method' 'premium':109 'price':57,168,187,199 'prompt':209 'protocol':82 'quot':173 'rate':74,171 'render':204 'request':61,100,117,152 'request/response':213 'requir':79 'return':113,154 'schema':214 'scheme':140 'second':146 'sentiment':162 'sign':95 'spars':197 'specif':102 'summar':165 'text':164 'timeout':147 'token':172 'unit':123 'unknown':219 'usdc':15,30,64,96,125,134 'usdc api' 'usdc-base-network' 'util':53 'valid':177 'varieti':42 'via':10,25 'wallet':208 'x':90 'x-payment':89 'x402':11,26,35,81 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"eaf8f614-eca0-4aba-b351-7bb8a178454d","listingId":"747dde9a-2147-4215-86d7-02612b60aa4a","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/charges/314","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:02.336Z"}],"sources":[{"listingId":"747dde9a-2147-4215-86d7-02612b60aa4a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/314","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:02.336Z","lastSeenAt":"2026-04-24T13:31:59.958Z"}],"details":{"listingId":"747dde9a-2147-4215-86d7-02612b60aa4a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/314 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-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 returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/314"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Programmatic access to analytics, AI inference, or financial data with per-call USDC payments","Testing x402 payment flows on Base network"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who prefer per-call pricing"],"notFor":["High-volume consumers needing bulk pricing or subscription discounts","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.731Z"},"updatedAt":"2026-04-24T13:31:59.958Z"}}