{"id":"c0858f80-bc12-482e-8276-050e81904da4","shortId":"Q9THSs","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 utility services. 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/205` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). The x402 challenge confirms the endpoint is live, accepts POST requests, and settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The asset contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` is the canonical USDC contract on Base.\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 is extremely thin: 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 usage examples available from the crawled content. The actual behavior and response format of this specific endpoint (`/api/v1/charges/205`) is unknown beyond its x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unknown beyond x402 challenge metadata","All doc/pricing/README pages render only 'Connect wallet' with no technical content","The specific endpoint '/api/v1/charges/205' does not appear in the site's listed API catalog, so its purpose is unclear","No request body schema or response format documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/205","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/205","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is no OpenAPI spec, no request/response schema, and all documentation pages return only a 'Connect wallet' stub. The actual functionality behind '/api/v1/charges/205' is undocumented and 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'/request':13,28 '0.02':12,27,62,113,179 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':141 '20':106 '6':117 'Base network API' 'USDC micropayment API' 'accept':127 'access':100 'across':45 'actual':225 'address':134 'advertis':152 'ai/ml':48 'analysi':156 'analyt':47 'api':5,20,37,72,99,189 'asset':139 'attach':82 'avail':219 'base':8,23,69,108,137,148 'base-network' 'behavior':226 'beyond':237 'broader':150 'call':4,19 'caller':80 'canon':144 'challeng':121,240 'classif':159 'confirm':122 'connect':198 'content':223 'contract':140,146 'convers':171 'crawl':222 'crypto-paid API' 'data':46,173 'decim':118 'detail':205 'doc':188 'document':183,214 'embed':160 'enabl':36 'endpoint':44,55,92,124,153,233 'estim':168 'exampl':218 'exchang':163 'extrem':185 'feed':162 'finance/web3':50 'format':229 'gas':167 'generat':174 'geocod':169 'header':86 'howev':182 'i.e':112 'infer':49 'key':73 'limit':75 'list':96 'live':126 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'maximum':104 'metadata':241 'network':9,24,70 'no-api-key' 'offer':40 'openapi':209 'page':193 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payment':85,132 'per':3,18,59 'platform':6,21,38,151 'point':181 'post':128 'post-endpoint' 'premium':98 'price':161,180,190 'prompt':200 'quot':166 'rate':74,164 'readm':192 'render':195 'request':60,89,129 'request/response':212 'requir':79,102 'respons':228 'schema':213 'sentiment':155 'servic':53 'settl':64,131 'simpli':81 'sinc':114 'spec':210 'specif':91,232 'subscript':77 'summar':158 'technic':204 'text':157 'thin':186 'token':165 'unit':109 'unknown':236 'usag':217 'usdc':15,30,66,111,115,145 'usdc-settlement' 'use':116 'util':52 'valid':170 'varieti':42 'via':10,25 'wallet':199 'x402':11,26,35,84,120,239 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e3c5ff17-eaca-4f78-afe6-b2124040e1e3","listingId":"c0858f80-bc12-482e-8276-050e81904da4","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/205","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:33.916Z"}],"sources":[{"listingId":"c0858f80-bc12-482e-8276-050e81904da4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/205","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:33.916Z","lastSeenAt":"2026-04-24T16:31:48.221Z"}],"details":{"listingId":"c0858f80-bc12-482e-8276-050e81904da4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/205 \\\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, no API keys, no rate limits, settled on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/205"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/205"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to data, AI, finance, or utility endpoints without subscriptions"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto-native micropayments over traditional API billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.037Z"},"updatedAt":"2026-04-24T16:31:48.221Z"}}