{"id":"d09aaa0c-b617-46fc-99af-8714ed0cdcd5","shortId":"bDAwBy","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, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/messages/136` is labeled \"Premium API Access\" and charges a maximum of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys, subscriptions, or rate limits are advertised — 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.\n\nThis particular endpoint (`/api/v1/messages/136`) does not clearly map to any of the named categories on the landing page, so its exact functionality is uncertain. The x402 challenge confirms it is live and accepts POST requests returning `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api","infrastructure"],"synonyms":["x402 api","pay per call api","micropayment api","USDC api","base network api","lowpaymentfee","premium api access","402 payment api"],"warnings":["The exact functionality of /api/v1/messages/136 is unknown — it does not appear in the site's listed API catalog","No request body schema or response schema is documented anywhere","No OpenAPI spec, README, or detailed docs were found","All non-root crawled pages returned minimal content ('Connect wallet')"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/136","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/136","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation of request/response formats, and the specific endpoint's purpose ('messages/136') is unexplained. Crawled pages beyond the landing page returned only 'Connect wallet' with no useful 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'/request':13,28,157 '0.02':12,27,77,156 '000':71 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':202 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':209 '20':70 '402 payment api' '6':83 'USDC api' 'accept':191 'access':7,22,64 'across':114 'address':201 'advertis':93,112 'ai':124 'analysi':128 'analyt':118 'api':6,21,40,63,86 'application/json':195 'attach':96 'base':9,24,53,72,208 'base network api' 'broader':109 'call':4,19 'caller':94 'categori':116,172 'challeng':185 'charg':66 'classif':131 'clear':165 'collect':34 'confirm':186 'contract':206 'convers':148 'data':117,121 'decim':84 'embed':132 'endpoint':41,57,113,152,161 'estim':142 'exact':179 'exchang':137 'export':122 'feed':136 'financ':133 'four':115 'function':180 'gas':141 'gate':42 'generat':149 'geocod':146 'header':101 'host':32 'i.e':76 'infrastructur':144 'insight':123 'json-api' 'key':87 'label':61 'land':175 'learn':126 'limit':91 'list':151 'live':189 'lowpaymentfee' 'lowpaymentfee.com':31,110 'machin':125 'map':166 'maximum':68 'metric':119 'micropayment api' 'name':171 'network':54 'no-api-key' 'page':176 'particular':160 'pay':2,17,37 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':36 'payment':48,100,106,197 'per':3,18,38,78 'platform':111 'post':192 'post-method' 'premium':5,20,62 'premium api access' 'price':135,158 'proof':107 'protocol':46 'quot':140 'rate':90,138 'report':120 'request':39,79,193 'return':194 'sent':199 'sentiment':127 'settl':47 'share':153 'simpli':95 'sinc':80 'specif':56 'subscript':88 'summar':130 'text':129 'token':139 'uncertain':182 'unit':73 'usdc':15,30,50,75,81,205 'usdc-base' 'use':82,203 'util':145 'valid':104,147 'via':10,25 'web3':134 'x':99 'x-payment':98 'x402':11,26,45,105,184 'x402 api' 'x402-payment'","prices":[{"id":"4e7aca2d-3bca-488a-aba0-8f02f9a876c1","listingId":"d09aaa0c-b617-46fc-99af-8714ed0cdcd5","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/136","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.180Z"}],"sources":[{"listingId":"d09aaa0c-b617-46fc-99af-8714ed0cdcd5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/136","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.180Z","lastSeenAt":"2026-04-22T02:32:06.443Z"}],"details":{"listingId":"d09aaa0c-b617-46fc-99af-8714ed0cdcd5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/136 \\\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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/136"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/136"}],"useCases":["Accessing premium API content with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need frictionless pay-per-call API access without API keys","Low-volume consumers who want no subscription commitments"],"notFor":["High-throughput production workloads requiring SLAs and guaranteed uptime","Users who need detailed documentation or OpenAPI schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.455Z"},"updatedAt":"2026-04-22T02:32:06.443Z"}}