{"id":"bf5fd98a-3688-4a63-b89e-123bf43ef153","shortId":"CCLDMQ","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering messaging, analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering messaging, analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/messages/4` is labeled \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform lists additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same $0.02 price point.\n\nDocumentation is minimal: the landing page lists available routes and pricing, but there is no OpenAPI spec, no request/response schema documentation, and the /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt. Without schemas or example payloads, callers will need to experiment to discover the expected request format and response structure for each endpoint.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","messaging-api","no-api-key","no-rate-limit","pay-per-use"],"categories":["api-gateway","messaging"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The endpoint path '/api/v1/messages/4' and description 'Premium API Access' give no clear indication of what the endpoint actually does","The /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful content","Example request JSON is speculative — no schema was provided by the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/4","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/messages/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the /api, /pricing, and /README pages are empty. The endpoint's actual functionality (\"Premium API Access\" on a messages route) is unclear. Pricing is clear at 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'/api/v1/messages/4':96 '/pricing':186 '/readme':188 '/request':19,38 '0.02':18,37,126,159 '000':115 '0x8335':120 '20':114 '2913':121 '6':131 'Base network API' 'USDC micropayment API' 'accept':103 'access':101 'addit':137 'advertis':109 'ai':13,32,57 'analysi':141 'analyt':12,31,56 'api':5,24,45,83,100 'avail':169 'bare':194 'base':8,27,76,116,123 'broad':50 'broader':134 'call':4,23,128 'caller':203 'challeng':108 'classif':144 'collect':51 'connect':195 'convers':152 'cost':112 'cover':10,29 'crypto-paid API' 'data':55 'decim':132 'discov':209 'document':162,182 'embed':145 'enabl':44 'endpoint':53,66,94,138,219 'equal':125 'exampl':201 'exchang':148 'expect':211 'experi':207 'feed':147 'financ':14,33,60 'format':213 'geocod':150 'infrastructur':63 'key':84 'label':98 'land':166 'learn':59 'limit':87 'list':136,168 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'maximum':111 'messag':11,30 'messaging-api' 'minim':164 'need':205 'network':77 'no-api-key' 'no-rate-limit' 'offer':48 'openapi':177 'page':167,189 'paid':68 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-use' 'payload':202 'per':3,22,70,127 'per-request':69 'per-request-billing' 'platform':46,135 'point':161 'post':104 'premium':99 'price':146,160,172 'prompt':197 'protocol':81 'rate':86,149 'request':71,105,212 'request/response':180 'requir':91 'resolv':191 'respons':215 'rout':170 'schema':181,199 'sentiment':140 'span':54 'spec':178 'specif':93 'structur':216 'subscript':90 'suit':6,25 'summar':143 'text':142 'unit':117 'usdc':9,28,73,119,129 'usdc-base' 'use':72,130 'util':16,35,64 'valid':151 'via':78 'wallet':196 'web3':61 'without':198 'x402':43,80,107 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"87e4ff56-5554-476a-99ae-2493248af24b","listingId":"bf5fd98a-3688-4a63-b89e-123bf43ef153","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/messages/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.746Z"}],"sources":[{"listingId":"bf5fd98a-3688-4a63-b89e-123bf43ef153","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.746Z","lastSeenAt":"2026-04-22T02:32:07.691Z"}],"details":{"listingId":"bf5fd98a-3688-4a63-b89e-123bf43ef153","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/4 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"message\": \"hello\"}'","exampleRequest":{"message":"hello"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/4"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Sending or retrieving messages via a pay-per-call interface without managing API keys","Integrating low-cost per-request APIs into agent workflows that settle payments on Base","Exploring x402 protocol integration with a simple, inexpensive endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, per-call API access settled in USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","High-volume use cases where per-request crypto settlement overhead matters","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.438Z"},"updatedAt":"2026-04-22T02:32:07.691Z"}}