{"id":"282c80e1-bf70-4bbf-bdf4-28441d612544","shortId":"ccybe6","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/messages/16` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises 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 listed endpoints share the same $0.02/request pricing model.\n\nThis particular endpoint (`/api/v1/messages/16`) does not have detailed documentation beyond its title. There is no OpenAPI spec, no request/response schema, and the crawled docs and pricing pages returned only a wallet-connect prompt with no additional content. The exact functionality behind \"Premium API Access\" at this path is unclear — it may serve a specific message or content resource, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact purpose and response format of /api/v1/messages/16 is undocumented","Crawled /api, /pricing, and /README pages returned no useful content (wallet-connect only)","Cannot verify what data or service 'Premium API Access' actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/16","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/16","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation for this specific endpoint, and the crawled pages beyond the homepage returned only wallet-connect stubs. The actual functionality of /api/v1/messages/16 is 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'/request':13,28,165 '0.02':12,27,85,164 '000':80 '0x8335':70 '20':79 '2913':71 '6':90 'Base network API' 'USDC micropayment API' 'accept':61 'access':7,22,59,212 'across':122 'addit':204 'advertis':120 'ai':132 'analysi':136 'analyt':126 'api':6,21,40,58,93,211 'attach':104 'avail':233 'base':9,24,49,73,81 'base-network' 'behind':209 'beyond':177 'broader':117 'call':4,19 'caller':102 'cannot':229 'categori':124 'classif':139 'collect':34 'commit':99 'confirm':231 'connect':200 'content':205,225 'contract':69 'convers':156 'cost':77 'crawl':190 'crypto-paid endpoint' 'data':125,129 'decim':91 'detail':175 'doc':191 'document':176 'embed':140 'endpoint':41,53,121,160,170 'equal':84 'estim':150 'exact':207 'exchang':145 'export':130 'feed':144 'financ':141 'four':123 'function':208 'gas':149 'gate':42 'generat':157 'geocod':154 'header':109 'host':32 'infrastructur':152 'insight':131 'key':94 'label':56 'learn':134 'limit':96 'list':159 'lowpaymentfee' 'lowpaymentfee.com':31,118 'machin':133 'materi':234 'maximum':76 'may':219 'messag':223 'metric':127 'model':167 'network':50 'no-api-key' 'no-rate-limit' 'openapi':183 'page':194 'particular':169 'path':215 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':64,108,114 'per':3,18,38,86 'per-request-billing' 'platform':119 'post':62 'post-endpoint' 'premium':5,20,57,210 'premium API access' 'price':143,166,193 'prompt':201 'proof':115 'protocol':46 'quot':148 'rate':95,146 'report':128 'request':39,63,87 'request/response':186 'requir':101 'resourc':226 'return':195 'schema':187 'sentiment':135 'serv':220 'settl':66 'share':161 'simpli':103 'spec':184 'specif':52,222 'summar':138 'text':137 'titl':179 'token':147 'unclear':217 'unit':82 'upfront':98 'usdc':15,30,68,88 'usdc-settlement' 'use':89 'util':153 'valid':112,155 'via':10,25 'wallet':199 'wallet-connect':198 'web3':142 'x':107 'x-payment':106 'x402':11,26,45,113 'x402 API' 'x402-payment'","prices":[{"id":"b4f97229-8e2f-4edd-adae-a624b6d593c4","listingId":"282c80e1-bf70-4bbf-bdf4-28441d612544","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.332Z"}],"sources":[{"listingId":"282c80e1-bf70-4bbf-bdf4-28441d612544","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.332Z","lastSeenAt":"2026-04-22T02:32:06.797Z"}],"details":{"listingId":"282c80e1-bf70-4bbf-bdf4-28441d612544","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/16 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/16"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/16"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium content or messages behind a per-request paywall","Integrating pay-as-you-go API calls into agent workflows without API key management","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume batch processing where per-call fees add up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.203Z"},"updatedAt":"2026-04-22T02:32:06.797Z"}}