{"id":"7b95c9df-6ea7-4b85-b952-3e8d3d76b702","shortId":"5aJwjM","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/136` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment of up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises four categories of APIs: 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 endpoints are priced uniformly at $0.02 per request. The `/api/v1/inbox/136` endpoint does not have detailed documentation specifying its exact functionality beyond the generic \"Premium API Access\" label, so its precise behavior is unclear.\n\nPayments are made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge was successfully captured with version 1 of the protocol, confirming the endpoint is live. However, no OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 api","micropayment api","pay-per-request api","base network api","usdc api access","lowpaymentfee","low payment fee api"],"warnings":["The exact functionality of /api/v1/inbox/136 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI spec, request schema, or response schema was found for this or any endpoint on the platform.","The /api, /pricing, and /README pages returned no meaningful content in the crawl (only 'Connect wallet').","This endpoint may be a generic inbox/catch-all rather than a specific service — purpose is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/136","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/136","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, the specific endpoint '/api/v1/inbox/136' has no documentation beyond the label 'Premium API Access' — no request schema, no response schema, no examples, and no explanation of what it actually does. The crawl pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':17,34 '0.02':16,33,83,164 '000':87 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':197 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':200 '1':211 '20':86 '6':93 'accept':73 'access':71,184 'address':196 'advertis':120 'ai':10,27,132 'analysi':136 'analyt':126 'api':4,21,41,70,96,124,183 'attach':105 'base':7,24,59,88,202 'base network api' 'behavior':189 'behind':49 'beyond':179 'broader':118 'call':85 'caller':103 'captur':208 'categori':122 'challeng':205 'classif':139 'confirm':215 'convers':156 'crawl':234 'data':9,26,125,129 'decim':94 'detail':173,224 'document':174,226 'embed':140 'endpoint':14,31,48,63,159,169,217 'estim':150 'exact':177 'exampl':229 'exchang':145 'export':130 'feed':144 'financ':11,28,141 'found':231 'four':121 'function':178 'gas':149 'gate':3,20,44 'generat':157 'generic':181 'geocod':154 'header':110 'howev':220 'infrastructur':152 'insight':131 'key':97 'label':185 'learn':134 'limit':100 'list':67 'live':219 'low payment fee api' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':133 'made':194 'marketplac':42 'metric':127 'micropay':53 'micropayment api' 'network':60 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':222 'pay-per-request api' 'payment':79,109,115,192 'per':51,84,165 'per-request':50 'per-request-micropayment' 'platform':5,22,119 'post':74 'post-endpoint' 'precis':188 'premium':69,182 'price':143,161 'proof':116 'protocol':40,214 'quot':148 'rate':99,146 'report':128 'request':52,75,166 'request/response':225 'requir':102 'schema':223 'sentiment':135 'settl':54 'simpli':104 'specif':62 'specifi':175 'success':207 'summar':138 'text':137 'token':147 'unclear':191 'uniform':162 'unit':89 'usag':228 'usdc':56,91,199 'usdc api access' 'usdc-base' 'use':198 'util':13,30,153 'valid':113,155 'varieti':46 'version':210 'web3':142 'x':108 'x-payment':107 'x402':2,19,39,78,114,204 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"91e2aa61-ed6f-4330-a9a4-8fddaf1c4cf6","listingId":"7b95c9df-6ea7-4b85-b952-3e8d3d76b702","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/136","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.644Z"}],"sources":[{"listingId":"7b95c9df-6ea7-4b85-b952-3e8d3d76b702","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/136","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.644Z","lastSeenAt":"2026-04-22T07:32:23.182Z"}],"details":{"listingId":"7b95c9df-6ea7-4b85-b952-3e8d3d76b702","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/136 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/136"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/inbox/136"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Integrating x402-compatible endpoints into automated pipelines without subscription overhead"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing keyless API access with no rate limits"],"notFor":["Users who need detailed API documentation and guaranteed SLAs before integrating","Applications requiring non-crypto payment methods (no fiat option available)","Use cases needing high-volume bulk pricing or subscription discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.741Z"},"updatedAt":"2026-04-22T07:32:23.182Z"}}