{"id":"5757c369-a47c-42a2-ba66-162e5a34405b","shortId":"4gbswr","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/inbox/74` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers authenticate by attaching an x402 payment header with each request.\n\nThe 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 with no rate limits or minimum commitments.\n\nNote that the specific endpoint being listed here (`/api/v1/inbox/74`) does not clearly map to any of the named API categories on the landing page. Its purpose is described only as \"Premium API Access\" with no further documentation on request/response format. The platform's docs, pricing, and README pages all require a wallet connection and do not expose additional technical detail. Treat this endpoint with caution until more documentation becomes available.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"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":["The endpoint path /api/v1/inbox/74 does not match any of the documented API categories on the landing page — its actual functionality is unknown.","No request or response schema is available; callers cannot know what to send or what to expect back.","Documentation pages (pricing, README, /api) are all behind a wallet-connect gate and returned no useful content.","This listing is effectively a stub due to lack of technical documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/74","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/inbox/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what /api/v1/inbox/74 actually does, no request/response schema, and the docs/pricing/README pages are gated behind wallet connection. The endpoint name 'Premium API Access' is generic and 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'/request':19,38,156 '0.02':18,37,80,155 '000':84 '20':83 '402 payment api' '6':90 'access':75,197 'account':96 'addit':222 'advertis':112 'ai':12,31,123 'analysi':127 'analyt':117 'api':5,24,45,74,93,183,196 'attach':102 'authent':100 'avail':234 'base':8,27,63,85 'base network api' 'base-network' 'becom':233 'broad':50 'call':4,23 'caller':99 'catalog':51 'categori':115,184 'caution':229 'classif':130 'clear':176 'commit':164 'connect':217 'convers':147 'cost':77 'data':11,30,116,120 'decim':91 'describ':192 'detail':224 'doc':208 'document':201,232 'embed':131 'enabl':44 'endpoint':16,35,57,67,114,151,169,227 'estim':141 'exchang':136 'export':121 'expos':221 'feed':135 'financ':13,32,132 'format':204 'four':113 'gas':140 'generat':148 'geocod':145 'header':106 'infrastructur':143 'insight':122 'key':94 'land':187 'learn':125 'limit':161 'list':71,150,171 'low payment fee' 'lowpaymentfee.com':39 'machin':124 'map':177 'metric':118 'micropayment api' 'minimum':163 'name':182 'network':64 'no-api-key' 'note':165 'offer':10,29 'page':188,212 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':105 'per':3,22,55,81 'platform':6,25,46,111,206 'post-endpoint' 'premium':73,195 'price':134,157,209 'provid':48 'purpos':190 'quot':139 'rate':137,160 'readm':211 'report':119 'request':56,82,109 'request/response':203 'requir':98,214 'sentiment':126 'settl':58 'share':152 'specif':66,168 'summar':129 'technic':223 'text':128 'token':138 'treat':225 'unit':86 'usdc':9,28,60,88 'usdc api' 'usdc-settlement' 'util':15,34,144 'valid':146 'wallet':216 'web3':133 'x402':43,104 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"74d8fb47-3e32-4c90-9860-52cc8494b827","listingId":"5757c369-a47c-42a2-ba66-162e5a34405b","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/inbox/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.598Z"}],"sources":[{"listingId":"5757c369-a47c-42a2-ba66-162e5a34405b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.598Z","lastSeenAt":"2026-04-22T04:02:46.013Z"}],"details":{"listingId":"5757c369-a47c-42a2-ba66-162e5a34405b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/74 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/inbox/74"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/74"},{"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":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a generic premium API endpoint via x402 micropayment","Agent-driven workflows that need keyless, per-call API access settled on-chain","Testing x402 payment flows against a live endpoint on Base"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need frictionless pay-per-call API access without credentials","Low-volume consumers who prefer per-request pricing over subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-throughput production workloads requiring well-documented schemas and error handling","Anyone who cannot pay in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.172Z"},"updatedAt":"2026-04-22T04:02:46.013Z"}}