{"id":"05b5f851-4a86-45f6-b2eb-e548ff1dd8e2","shortId":"34yLyE","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/transactions/113` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is via the x402 exact scheme with a 300-second timeout. The platform also advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what any endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what input the `/api/v1/transactions/113` endpoint expects or what data it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api-platform","finance"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","402 payment api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI spec or request/response schema provided","The purpose of /api/v1/transactions/113 ('Premium API Access') is unclear — no description of inputs or outputs","The broad catalog of advertised endpoints (AI, analytics, finance, utils) cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/113","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/transactions/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet' with no schema, examples, or description of what the endpoint does. The endpoint path '/api/v1/transactions/113' with description 'Premium API Access' is too vague to determine actual 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'/api/v1/transactions/113':90,216 '/docs':165 '/pricing':166 '/readme':169 '/request':13,28 '0.02':12,27,65,117,157 '000':106 '0x8335':111 '20':105 '2913':112 '300':127 '402':100,204 '402 payment api' 'access':96 'across':50 'actual':198 'advertis':133 'ai/ml':53 'also':132 'analysi':138 'analyt':52 'api':5,20,37,77,95 'base':8,23,73,107,114 'base network api' 'broad':42 'call':4,19 'catalog':43 'challeng':101,205 'classif':141 'commit':84 'confirm':206 'connect':175 'content':181 'convers':149 'data':51,56,151,221 'document':160,190,209 'embed':142 'enabl':36 'endpoint':49,61,88,135,197,201,217 'equal':116 'exact':123 'exampl':193 'exchang':145 'expect':218 'export':152 'extrem':162 'feed':144 'finance/web3':55 'geocod':147 'infer':54 'input':214 'json-api' 'key':78 'limit':81 'list':92 'live':203 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,74 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':185 'page':170 'pay':2,17,46 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':45 'payabl':68 'payment':118 'per':3,18,47,66 'platform':6,21,38,131 'point':159 'premium':94 'price':63,143,158 'prompt':177 'rate':80,146 'render':172 'request':48,67,102 'request/response':188 'requir':85 'return':98,199,223 'schema':189 'scheme':124 'second':128 'sentiment':137 'servic':59 'sibl':134 'spars':163 'spec':186 'specif':87 'summar':140 'text':139 'timeout':129 'unclear':212 'unit':108 'usdc':15,30,70,110 'usdc api' 'usdc-base' 'util':58 'valid':148 'via':10,25,120 'wallet':176 'without':208 'x402':11,26,35,122 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"9f03515c-d4bf-4e77-9c46-e1e795bc0f8a","listingId":"05b5f851-4a86-45f6-b2eb-e548ff1dd8e2","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/transactions/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:22.579Z"}],"sources":[{"listingId":"05b5f851-4a86-45f6-b2eb-e548ff1dd8e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/113","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:22.579Z","lastSeenAt":"2026-04-23T23:03:08.575Z"}],"details":{"listingId":"05b5f851-4a86-45f6-b2eb-e548ff1dd8e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/113 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/113"},{"claim":"Endpoint described as 'Premium API Access' in x402 challenge","source_url":"https://lowpaymentfee.com/api/v1/transactions/113"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to transaction or financial data without subscriptions"],"bestFor":["Developers who want zero-commitment, pay-per-call API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.239Z"},"updatedAt":"2026-04-23T23:03:08.575Z"}}