{"id":"13e7f22c-e43c-45ac-a1f9-9a0410509541","shortId":"DA9Tvf","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 pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/153` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 \"exact\" scheme 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 data generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. The exact capabilities and response formats of this specific endpoint (charges/153) are unclear from available material.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","no-api-key endpoint","pay-as-you-go api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/charges/153 ('Premium API Access') is not described anywhere — it is unclear what data or service it returns","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no content","No example request or response payloads are available to confirm endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/153","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/153","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 with clear pricing. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the specific purpose of '/api/v1/charges/153' ('Premium API Access') is entirely opaque. The docs/pricing/README pages are empty 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'/request':13,28 '0.02':12,27,62,126,182 '000':110 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':115 '20':109 '2913':116 '300':149 '402':104 '6':122 'access':100 'across':45 'address':145 'advertis':134,155 'ai-inference' 'ai/ml':48 'analysi':159 'analyt':47 'api':5,20,37,72,99,202 'attach':82 'avail':232 'base':8,23,69,111,118 'base network api' 'base-network' 'broader':153 'call':4,19,128 'caller':80 'capabl':220 'challeng':105 'charges/153':228 'classif':162 'classification' 'connect':211 'consist':129 'content':217 'convers':174 'crawl':199 'crypto-quotes' 'data':46,176 'data-analytics' 'decim':123 'detail':189 'doc':201 'document':190 'embed':163 'embeddings' 'enabl':36 'endpoint':44,55,92,156,227 'equal':125 'estim':171 'exact':142,219 'exampl':192 'exchang':166 'feed':165 'finance-data' 'finance/web3':50 'format':223 'found':196 'gas':170 'generat':177 'geocod':172 'geocoding' 'header':86 'howev':185 'infer':49 'infrastructur':52 'key':73 'limit':75 'list':96 'low payment fee' 'lowpaymentfee.com':31 'made':138 'materi':233 'micropayment api' 'network':9,24,70 'no-api-key endpoint' 'offer':40 'openapi':187 'page':206 'pay':2,17,58 'pay per call api' 'pay-as-you-go api' 'pay-per-cal':1,16 'pay-per-request':57 'payload':194 'payment':85,136 'per':3,18,59,127 'per-request-pricing' 'platform':6,21,38,154 'point':184 'premium':98 'price':135,164,183,203 'prompt':213 'quot':169 'rate':74,167 'readm':205 'request':60,89,106 'request/response':193 'requir':79 'respons':222 'return':102,208 'schema':188 'scheme':143 'second':150 'sentiment':158 'sentiment-analysis' 'settl':64 'simpli':81 'sinc':119 'site':132 'specif':91,226 'subscript':77 'substant':216 'summar':161 'text':160 'text-summarization' 'timeout':151 'token':168 'unclear':230 'unit':112 'usdc':15,30,66,114,120 'usdc api' 'usdc-settlement' 'use':121 'util':53 'utility-services' 'valid':173 'varieti':42 'via':10,25,139 'wallet':212 'x402':11,26,35,84,141 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"6fe24d3b-5ff0-406f-8f07-9355e925dbe0","listingId":"13e7f22c-e43c-45ac-a1f9-9a0410509541","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/153","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:26.677Z"}],"sources":[{"listingId":"13e7f22c-e43c-45ac-a1f9-9a0410509541","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/153","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:26.677Z","lastSeenAt":"2026-04-22T16:31:13.473Z"}],"details":{"listingId":"13e7f22c-e43c-45ac-a1f9-9a0410509541","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/153 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/153"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/153"}],"useCases":["Agents making ad-hoc API calls without needing pre-registered API keys","On-demand AI inference (sentiment, summarization, classification) with per-call crypto payment","Fetching real-time crypto quotes, gas estimates, or exchange rates via micropayment","Geocoding or data validation without subscription commitments"],"bestFor":["AI agents and bots that need keyless, pay-per-use API access","Developers experimenting with x402 protocol integrations","Low-volume or sporadic API consumers who want to avoid subscriptions"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.397Z"},"updatedAt":"2026-04-22T16:31:13.473Z"}}