{"id":"c39d0645-ae7b-4f43-a69c-4774b9f6f881","shortId":"aMZz4Z","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/70` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers pay per request via the x402 protocol's X-PAYMENT header.\n\nThe wider platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, the specific `/api/v1/messages/70` path does not clearly map to any of these advertised categories, and no documentation describes what \"messages/70\" actually returns.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme \"exact\" on the Base network, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The method is POST and the output MIME type is `application/json`. No OpenAPI schema, request body schema, or response schema is provided, so the exact input/output contract is unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","post-method"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment endpoint"],"warnings":["The /api/v1/messages/70 path is not listed among the platform's advertised endpoints; its purpose is unclear.","No request body schema or response schema is documented anywhere.","The /pricing, /api, and /README pages returned no meaningful content (only 'Connect wallet').","No OpenAPI spec, ai-plugin manifest, or agents.txt is available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/70","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/70","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 challenge, but there is no documentation for the /api/v1/messages/70 path specifically — it doesn't match any of the advertised endpoint categories. No request or response schema is available, and the crawled docs/pricing/README pages returned only 'Connect wallet' with no useful 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'/request':19,38,160 '0.02':18,37,80,159 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':207 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':210 '20':83 '402':196 '402 payment endpoint' '6':90 'Base network API' 'USDC micropayment API' 'access':75 'actual':183 'address':206 'advertis':99,116,175 'ai':12,31,127 'analysi':131 'analyt':121 'api':5,24,45,74,93 'application/json':221 'base':8,27,63,85,202 'base-network' 'bodi':226 'broad':50 'call':4,23,82 'caller':100 'catalog':51 'categori':119,176 'challeng':194 'classif':134 'clear':169 'contract':237 'convers':151 'cost':77 'data':11,30,120,124 'decim':91 'describ':180 'document':179 'embed':135 'enabl':44 'endpoint':16,35,57,67,118,155,186 'estim':145 'exact':199,235 'exchang':140 'export':125 'feed':139 'financ':13,32,136 'four':117 'gas':144 'generat':152 'geocod':149 'header':112 'howev':162 'http':195 'infrastructur':147 'input/output':236 'insight':126 'json-api' 'key':94 'learn':129 'limit':97 'list':71,154 'live':188 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':128 'map':170 'messages/70':182 'method':212 'metric':122 'mime':218 'network':64,203 'offer':10,29 'openapi':223 'output':217 'path':166 'pay':2,21,54,101,204 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':111 'per':3,22,55,81,102 'platform':6,25,46,115 'post':214 'post-method' 'premium':73 'price':138,161 'protocol':107 'provid':48,232 'quot':143 'rate':96,141 'report':123 'request':56,103,225 'respons':229 'return':184,190 'schema':224,227,230 'scheme':198 'sentiment':130 'settl':58 'share':156 'specif':66,164 'summar':133 'text':132 'token':142 'type':219 'unit':86 'unknown':239 'usdc':9,28,60,88,209 'usdc-settlement' 'util':15,34,148 'valid':150,192 'via':104 'web3':137 'wider':114 'x':110 'x-payment':109 'x402':43,106,193 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2ab9a722-8932-41af-9202-8a8b99902642","listingId":"c39d0645-ae7b-4f43-a69c-4774b9f6f881","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.048Z"}],"sources":[{"listingId":"c39d0645-ae7b-4f43-a69c-4774b9f6f881","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/70","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.048Z","lastSeenAt":"2026-04-22T02:32:08.107Z"}],"details":{"listingId":"c39d0645-ae7b-4f43-a69c-4774b9f6f881","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/70 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/70"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/70"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource without needing API keys or subscriptions","Agent-driven workflows that need to pay per call using USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402 protocol experimentation at low cost ($0.02/call)","Scenarios where no signup or rate-limit management is desired"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone who needs to know the exact request/response schema before calling"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.055Z"},"updatedAt":"2026-04-22T02:32:08.107Z"}}