{"id":"1e08d932-7854-4417-9ddd-83e6918512e3","shortId":"9CdN3c","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/inbox/116` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request paid in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain using USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The provider advertises no rate limits and instant access.\n\nHowever, the specific functionality behind `/api/v1/inbox/116` is not documented on the provider's landing page — it does not appear in any of the listed API categories. The landing page catalogs endpoints like sentiment analysis, text summarization, price feeds, geocoding, and more, but \"inbox/116\" is not among them. Without further documentation or an OpenAPI spec, the exact input/output behavior of this particular endpoint is unknown. Callers should treat this as an opaque premium endpoint until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limits"],"categories":["api","infrastructure"],"synonyms":["x402 api","pay per call api","usdc api access","base network api","micropayment api","lowpaymentfee","premium api"],"warnings":["The endpoint path /api/v1/inbox/116 is not listed in the provider's public API catalog — its purpose is unknown.","No OpenAPI spec or schema documentation is available for this or any endpoint on the site.","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.","Without knowing what this endpoint does, callers risk paying $0.02 for an unknown response."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/116","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/116","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 confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/inbox/116 is completely undocumented — it does not appear in the provider's own catalog. No OpenAPI spec, no input/output schema, and no example responses are 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'/request':13,28 '0.02':12,27,76,122 '000':117 '0x8335':107 '20':116 '2913':108 '6':125 'accept':95 'access':7,22,38,154 'advertis':148 'ai':65 'among':200 'amount':114 'analysi':188 'analyt':64 'api':6,21,37,128,179 'appear':173 'attach':134 'base':9,24,84,110,118 'base network api' 'behavior':212 'behind':159 'broad':60 'call':4,19 'caller':132,219 'catalog':61,184 'categori':180 'chain':103 'challeng':88 'confirm':89 'contract':106 'data':63 'decim':126 'document':163,204,230 'endpoint':32,52,91,185,216,227 'equal':121 'exact':210 'feed':192 'financ':68 'function':158 'geocod':193 'header':139 'host':58 'howev':155 'inbox/116':197 'infrastructur':71 'input/output':211 'instant':153 'key':129 'land':168,182 'learn':67 'like':186 'limit':151 'list':178 'live':93 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':66 'mani':51 'maximum':113 'micropayment api' 'network':85 'no-api-key' 'no-rate-limits' 'offer':53 'on-chain':101 'one':49 'opaqu':225 'openapi':207 'page':169,183 'paid':79 'particular':215 'path':46 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':42,98,138,144 'per':3,18,77 'post':96 'post-endpoint' 'premium':5,20,36,226 'premium api' 'price':74,191 'proof':145 'protocol':43 'provid':35,56,147,166 'rate':150 'request':78,97 'requir':131 'sentiment':187 'settl':100 'simpli':133 'span':62 'spec':208 'specif':45,157 'summar':190 'surfac':231 'text':189 'treat':221 'unit':119 'unknown':218 'usdc':15,30,81,105,123 'usdc api access' 'usdc-base' 'use':104,124 'util':72 'valid':142 'via':10,25,39 'web3':69 'without':202 'x':137 'x-payment':136 'x402':11,26,41,87,143 'x402 api' 'x402-payment'","prices":[{"id":"d92f8df6-7dd8-400c-b0e9-2434f468272d","listingId":"1e08d932-7854-4417-9ddd-83e6918512e3","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/116","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.457Z"}],"sources":[{"listingId":"1e08d932-7854-4417-9ddd-83e6918512e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/116","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.457Z","lastSeenAt":"2026-04-22T01:02:14.954Z"}],"details":{"listingId":"1e08d932-7854-4417-9ddd-83e6918512e3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/116 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The provider lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure — all at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $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 in USDC (6 decimals) = $0.02, settled on Base.","source_url":"https://lowpaymentfee.com/api/v1/inbox/116"}],"useCases":["Programmatic access to a premium API endpoint with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API calls settled on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC payments on Base autonomously","Users who want pay-as-you-go access without subscriptions or API keys"],"notFor":["Users who need clearly documented input/output schemas before calling","Anyone without a Base-compatible wallet or USDC balance","High-volume batch workloads where $0.02/request adds up quickly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.997Z"},"updatedAt":"2026-04-22T01:02:14.954Z"}}