{"id":"cb8d6df3-2b70-4f85-adab-7b4b954378ea","shortId":"V7aBUn","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","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/137` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\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.\n\nImportant caveat: the specific `/api/v1/inbox/137` path does not correspond to any of the named endpoints on the landing page, and no documentation, OpenAPI schema, or example request/response payloads are available for it. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. Without further documentation it is unclear what this particular inbox endpoint accepts or returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post","json-response"],"categories":["api-platform","data","ai","finance","infrastructure"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","402 payment api"],"warnings":["No documentation or schema available for /api/v1/inbox/137 — its purpose is unclear","The /inbox/137 path does not match any named endpoint on the provider's landing page","No OpenAPI spec, README content, or example payloads were found","Pricing, docs, and README pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/137","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/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation for the /inbox/137 path specifically, no example request or response bodies, and the crawled pages beyond the landing page were empty. The endpoint's actual functionality is 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'/request':19,38,168 '0.02':18,37,80,167 '000':84 '20':83 '402 payment api' '6':90 'accept':231 'access':75 'account':102 'addit':218 'advertis':124 'ai':12,31,135 'analysi':139 'analyt':129 'api':5,24,45,74,100 'attach':110 'avail':199 'base':8,27,63,85 'base network api' 'broad':50 'call':4,23,82 'caller':108 'catalog':51 'categori':127 'caveat':171 'classif':142 'connect':213 'content':219 'convers':159 'correspond':178 'cost':77 'cover':10,29 'crawl':203 'data':11,30,128,132 'decim':91 'doc':204 'document':191,222 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,163,184,230 'estim':153 'exampl':195 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'four':125 'gas':152 'generat':160 'geocod':157 'handl':94 'header':115 'http-post' 'import':170 'inbox':229 'infrastructur':155 'insight':134 'json-response' 'key':101 'land':187 'learn':137 'limit':105 'list':71,162 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':136 'metric':130 'micropayment api' 'name':183 'network':64 'no-api-key' 'offer':48 'openapi':192 'page':188,208 'particular':228 'path':175 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':197 'payment':92,114,119 'per':3,22,55,81 'platform':6,25,46,123 'premium':73 'price':146,169,205 'prompt':215 'proof':120 'protocol':98 'quot':151 'rate':104,149 'readm':207 'report':131 'request':56 'request/response':196 'requir':107 'return':210,233 'schema':193 'sentiment':138 'settl':58 'share':164 'simpli':109 'specif':66,173 'summar':141 'text':140 'token':150 'unclear':225 'unit':86 'usdc':9,28,60,88 'usdc api' 'usdc-base' 'util':15,34,156 'valid':118,158 'via':95 'wallet':214 'web3':145 'wider':122 'without':220 'x':113 'x-payment':112 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d54e1b6f-4d60-466a-adc3-ecfd542cc048","listingId":"cb8d6df3-2b70-4f85-adab-7b4b954378ea","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/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.262Z"}],"sources":[{"listingId":"cb8d6df3-2b70-4f85-adab-7b4b954378ea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/137","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.262Z","lastSeenAt":"2026-04-22T02:31:59.105Z"}],"details":{"listingId":"cb8d6df3-2b70-4f85-adab-7b4b954378ea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/137 \\\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/137"},{"claim":"All listed endpoints cost $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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/137"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to data analytics, AI inference, or financial data without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled instantly in USDC on Base","Prototyping or low-volume usage where flat per-request pricing avoids commitment"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agent wallets on the Base network","Low-volume or bursty workloads where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Callers without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.394Z"},"updatedAt":"2026-04-22T02:31:59.105Z"}}