{"id":"51594b57-bf2a-4f28-b135-65782ce8df67","shortId":"dEzS4H","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that hosts a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/126` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and is discoverable. The broader platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further content. No OpenAPI spec, request/response schemas, or usage examples are published, so the exact input format and response structure for this endpoint are unknown.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","json-api","http-post","no-api-key","no-rate-limit"],"categories":["api-platform","general"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","micropayment API","USDC API","Base network API"],"warnings":["No OpenAPI spec or request/response schema available","No documentation beyond the landing page — /api, /pricing, /README all show only 'Connect wallet'","The specific purpose of /api/v1/messages/126 is unclear; 'Premium API Access' is a generic description","Cannot verify what data or functionality this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/126","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The purpose of /api/v1/messages/126 specifically is opaque — 'Premium API Access' is a generic label. Effectively a stub 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'/api/v1/messages/126':110 '/pricing':196 '/readme':198 '/request':19,38 '0.02':18,37,70,140,184 '000':129 '0x8335':134 '20':128 '2913':135 '6':144 'Base network API' 'USDC API' 'accept':148 'access':116 'advertis':123 'ai':12,31 'ai/ml':57 'also':157 'analysi':162 'analyt':56 'api':5,24,45,87,115 'application/json':119 'attach':98 'base':8,27,78,130,137 'beyond':188 'broad':50 'broader':155 'call':4,23 'caller':96 'challeng':122 'classif':165 'collect':51 'commit':95 'connect':204 'content':210 'convers':177 'cost':126 'data':11,30,55,60 'decim':145 'discover':153 'document':187 'embed':166 'enabl':44 'endpoint':16,35,53,66,108,147,159,231 'equal':139 'estim':174 'everi':65 'exact':223 'exampl':218 'exchang':169 'expos':158 'feed':168 'financ':13,32 'finance/web3':59 'format':225 'gas':173 'general':62 'generat':179 'geocod':175 'given':141 'header':102 'host':48 'http':149 'http-post' 'infer':58 'input':224 'json-api' 'key':88 'land':190 'limit':91 'list':112 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'maximum':125 'micropayment API' 'minimum':94 'network':79 'no-api-key' 'no-rate-limit' 'offer':10,29 'openapi':212 'page':191,199 'paid':73 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payment':101 'per':3,22,71 'per-request-pricing' 'platform':6,25,46,156 'point':186 'post':150 'premium':114 'price':68,167,185 'prompt':206 'protocol':83 'publish':220 'quot':172 'rate':90,170 'request':72,105 'request/response':214 'resolv':201 'respons':227 'return':118 'schema':215 'sentiment':161 'servic':64 'simpli':97 'span':54 'spars':193 'spec':213 'specif':107 'structur':228 'summar':164 'text':163 'token':171 'unit':131 'unknown':233 'usag':217 'usdc':9,28,75,133,142 'usdc-base' 'util':15,34,63 'valid':176 'via':80 'wallet':205 'x402':43,82,100,121 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7b824e5e-0b4d-4b11-b039-156d302d9779","listingId":"51594b57-bf2a-4f28-b135-65782ce8df67","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.885Z"}],"sources":[{"listingId":"51594b57-bf2a-4f28-b135-65782ce8df67","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/126","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.885Z","lastSeenAt":"2026-04-22T04:02:39.537Z"}],"details":{"listingId":"51594b57-bf2a-4f28-b135-65782ce8df67","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/126 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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","source_url":"https://lowpaymentfee.com/api/v1/messages/126"},{"claim":"All 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"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/126"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Programmatic access to data, AI inference, or utility functions with per-call crypto payment","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who prefer per-call billing"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime","Users who need detailed API documentation or OpenAPI specs before integrating","Callers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.893Z"},"updatedAt":"2026-04-22T04:02:39.537Z"}}