{"id":"ef3f8704-1dd8-4972-b521-e10a46f96f1f","shortId":"D7jpPp","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 accessible via the x402 payment protocol on the Base network. Each call costs $0.02 in USDC (USD Coin) with no API keys, no rate limits, and no subscriptions required. The specific endpoint at `/api/v1/messages/149` is labeled \"Premium API Access\" and accepts POST requests, settling payments on-chain to a designated wallet address.\n\nThe broader 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 endpoints are listed at the same $0.02 per request price point.\n\nThe x402 challenge for this endpoint confirms it is live, requesting a maximum of 20,000 base units of USDC (6 decimals = $0.02) on the Base network. The payment scheme is \"exact\" with a 300-second timeout. No OpenAPI schema, detailed documentation, or example request/response payloads were found during the crawl — the `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint","premium-api-access"],"categories":["general","infrastructure"],"synonyms":["low payment fee API","x402 API","pay per call API","USDC API","Base network API","micropayment API","premium access endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific function of /api/v1/messages/149 is undocumented — 'Premium API Access' is the only description","All documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'","Request and response formats are unknown; no examples could be sourced"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/149","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/149","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 pricing and network details. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the specific purpose of `/api/v1/messages/149` is unclear. The crawled docs pages were empty (wallet-connect only). This is effectively a stub 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'/api/v1/messages/149':75 '/pricing':201 '/readme':203 '/request':13,28 '0.02':12,27,55,143,170 '000':163 '20':162 '300':182 '6':168 'Base network API' 'USDC API' 'accept':82 'access':7,22,42,80 'across':100 'addit':214 'address':94 'advertis':98 'ai':110 'analysi':114 'analyt':104 'api':6,21,40,62,79 'base':9,24,50,164,173 'base-network' 'broader':96 'call':4,19,53 'categori':102 'chain':89 'challeng':150 'classif':117 'coin':59 'collect':34 'confirm':154 'connect':209 'content':215 'convers':134 'cost':54 'crawl':198 'data':103,107 'decim':169 'design':92 'detail':188 'document':189 'embed':118 'endpoint':41,73,99,137,153 'estim':128 'exact':179 'exampl':191 'exchang':123 'export':108 'feed':122 'financ':119 'found':195 'four':101 'gas':127 'generat':135 'geocod':132 'host':32 'infrastructur':130 'insight':109 'key':63 'label':77 'learn':112 'limit':66 'list':139 'live':157 'low payment fee API' 'lowpaymentfee.com':31 'machin':111 'maximum':160 'metric':105 'micropayment API' 'network':51,174 'no-api-key' 'on-chain':87 'openapi':186 'page':204 'pay':2,17,37 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':36 'payload':193 'payment':46,86,176 'per':3,18,38,144 'platform':97 'point':147 'post':83 'post-endpoint' 'premium':5,20,78 'premium access endpoint' 'premium-api-access' 'price':121,146 'prompt':211 'protocol':47 'quot':126 'rate':65,124 'report':106 'request':39,84,145,158 'request/response':192 'requir':70 'return':206 'schema':187 'scheme':177 'second':183 'sentiment':113 'settl':85 'specif':72 'subscript':69 'summar':116 'text':115 'timeout':184 'token':125 'unit':165 'usd':58 'usdc':15,30,57,167 'usdc-settlement' 'util':131 'valid':133 'via':10,25,43 'wallet':93,210 'web3':120 'x402':11,26,45,149 'x402 API' 'x402-payment'","prices":[{"id":"cc08f58e-c1bd-49a4-9f2c-cc22e63c250c","listingId":"ef3f8704-1dd8-4972-b521-e10a46f96f1f","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/149","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.032Z"}],"sources":[{"listingId":"ef3f8704-1dd8-4972-b521-e10a46f96f1f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/149","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.032Z","lastSeenAt":"2026-04-22T04:02:39.691Z"}],"details":{"listingId":"ef3f8704-1dd8-4972-b521-e10a46f96f1f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/149 \\\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 valid x402 402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/149"},{"claim":"All endpoints are priced at $0.02 per 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"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/149"}],"useCases":["Accessing premium content or data behind a per-request paywall without needing an API key or subscription","Agent-driven workflows that need to pay for API calls programmatically using on-chain USDC","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC payments on Base for per-call access","Users who want pay-as-you-go API access without account creation"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who prefer subscription-based pricing over per-request payments","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.679Z"},"updatedAt":"2026-04-22T04:02:39.691Z"}}