{"id":"3ccafae9-9999-4301-a244-112f208a9c72","shortId":"33KMVV","kind":"x402","title":"Pay-per-request API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base (USDC) covering data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/38` is listed as \"Premium API Access\" and accepts POST requests with x402 payment of up to 20,000 base units of USDC (i.e., $0.02 per call). No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\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 endpoint `/api/v1/inbox/38` does not clearly map to any of these named categories, and no documentation describes what it actually returns.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing, the actual behavior of this endpoint is unknown. The x402 challenge confirms the endpoint is live and accepts POST requests with USDC payment on Base, but callers should be aware that the functionality behind this particular path is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","post-method","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","lowpaymentfee"],"warnings":["No documentation exists for the specific endpoint /api/v1/inbox/38 — its purpose and expected input/output are unknown.","No OpenAPI or schema definition is available for any endpoint on this platform.","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.","The endpoint path does not correspond to any of the named API categories listed on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/38","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge confirms the endpoint is live and priced at $0.02/call in USDC on Base, but there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/inbox/38 actually does. The endpoint path does not match any of the named APIs on the landing page, making its purpose entirely 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'/request':155 '0.02':87,154 '000':81 '20':80 'accept':71,214 'access':69 'actual':178,198 'advertis':97,111 'ai':12,28,122 'analysi':126 'analyt':116 'api':5,21,39,68,91 'attach':100 'awar':226 'base':8,24,57,82,221 'base network api' 'behavior':199 'behind':230 'beyond':192 'broad':44 'call':89 'caller':98,223 'catalog':45 'categori':114,171 'challeng':207 'classif':129 'clear':164 'confirm':208 'convers':146 'cover':10,26 'data':11,27,115,119 'describ':175 'document':174,191 'embed':130 'enabl':38 'endpoint':16,32,51,61,113,150,160,202,210 'estim':140 'exampl':188 'exchang':135 'export':120 'feed':134 'financ':13,29,131 'four':112 'function':229 'gas':139 'generat':147 'geocod':144 'header':104 'howev':157 'i.e':86 'infrastructur':142 'insight':121 'json-response' 'key':92 'land':194 'learn':124 'limit':95 'list':65,149,196 'live':212 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':123 'map':165 'metric':117 'micropayment api' 'name':170 'network':58 'offer':42 'openapi':184 'page':195 'particular':232 'path':233 'pay':2,18,48 'pay per call api' 'pay-per-request':1,17,47 'payment':76,103,219 'per':3,19,49,88 'platform':6,22,40,110 'post':72,215 'post-method' 'premium':67 'price':133,156 'quot':138 'rate':94,136 'report':118 'request':4,20,50,73,107,216 'request/response':187 'return':179 'schema':185 'sentiment':125 'settl':52 'share':151 'simpli':99 'specif':60,159 'summar':128 'text':127 'token':137 'undocu':235 'unit':83 'unknown':204 'usdc':9,25,54,85,218 'usdc api' 'usdc-base-network' 'util':15,31,143 'valid':145 'web3':132 'wider':109 'x402':37,75,102,206 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"e659900f-a49c-47af-b2c3-81e9fde30a64","listingId":"3ccafae9-9999-4301-a244-112f208a9c72","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.972Z"}],"sources":[{"listingId":"3ccafae9-9999-4301-a244-112f208a9c72","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.972Z","lastSeenAt":"2026-04-22T11:32:57.806Z"}],"details":{"listingId":"3ccafae9-9999-4301-a244-112f208a9c72","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/38 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/38"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/38"}],"useCases":["Programmatic access to undocumented premium API functionality via x402 micropayments","Agent-driven API consumption without API key management","Pay-as-you-go API calls settled on Base L2 in USDC"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","x402-compatible agents that can settle USDC on Base","Exploring low-cost micropayment API patterns"],"notFor":["Users who need documented, well-specified API contracts before calling","High-volume batch processing where per-call costs add up","Anyone requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.121Z"},"updatedAt":"2026-04-22T11:32:57.806Z"}}