{"id":"987e92f7-8342-41d0-a8dc-0b50979858a6","shortId":"fufWQ7","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/6` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four 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 endpoints are uniformly priced at $0.02 per request.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what request body the `/api/v1/transactions/6` endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payment","402 payment protocol"],"warnings":["No OpenAPI specification or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose and expected request/response format of /api/v1/transactions/6 is undocumented","No examples or sample payloads are provided anywhere on the site"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/6","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/6","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 it accepts USDC on Base at $0.02/request. However, documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and the docs pages are empty. The purpose of the specific '/transactions/6' endpoint is unclear beyond its title 'Premium API 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'/api/v1/transactions/6':60,215 '/docs':162 '/pricing':164 '/readme':166 '/request':13,30 '0.02':12,29,82,154 '000':76 '20':75 '402':70 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':50 'access':66,96 'across':112 'advertis':87 'ai':122 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89 'attach':99 'avail':193 'base':8,25,55,77 'bodi':213 'broader':108 'call':4,21,84 'categori':114 'challeng':71,204 'classif':129 'connect':172 'convers':146 'crypto API payment' 'data':115,119 'detail':179 'document':157,188,207 'embed':130 'endpoint':59,111,149,195,216 'estim':140 'exampl':191 'exchang':135 'expect':217 'export':120 'extrem':159 'feed':134 'financ':131 'four':113 'gas':139 'generat':147 'geocod':144 'header':103 'i.e':81 'infrastructur':142 'insight':121 'instant':95 'json-response' 'key':16,33,90 'learn':124 'limit':93 'list':62 'live':197 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'metric':117 'network':9,26,56 'no-api-key' 'offer':110 'openapi':183 'page':167 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payload':192 'payment':52,102 'per':3,20,40,83,155 'platform':6,23,43,86,109 'post-method' 'premium':64 'price':133,152 'prompt':174 'protocol':48 'quot':138 'rate':92,136 'render':169 'report':118 'request':41,72,106,156,212 'request/response':186 'requir':17,34 'respond':199 'return':68,221 'schema':187 'sentiment':125 'simpli':98 'spars':160 'spec':184 'specif':58 'summar':128 'technic':178 'text':127 'token':137 'unclear':210 'uniform':151 'unit':78 'usdc':51,80 'usdc-base-network' 'use':45 'util':143 'valid':145,202 'via':10,27 'wallet':173 'web3':132 'without':206 'x402':11,28,47,101,203 'x402 API' 'x402-payment'","prices":[{"id":"4eba2f43-926f-4dbd-a02f-6ee4aaa06cf3","listingId":"987e92f7-8342-41d0-a8dc-0b50979858a6","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:00.976Z"}],"sources":[{"listingId":"987e92f7-8342-41d0-a8dc-0b50979858a6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:00.976Z","lastSeenAt":"2026-04-23T06:31:40.028Z"}],"details":{"listingId":"987e92f7-8342-41d0-a8dc-0b50979858a6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/6 \\\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 requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/6"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/6"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without managing API keys","Making one-off transaction queries with instant crypto settlement"],"bestFor":["Developers who want keyless, pay-per-use API access","Agent systems that can attach x402 payment headers automatically","Users already holding USDC on the Base network"],"notFor":["Teams needing detailed API documentation or OpenAPI specs before integration","Users without USDC on the Base network or unfamiliar with x402 protocol","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.284Z"},"updatedAt":"2026-04-23T06:31:40.028Z"}}