{"id":"3dcb19a3-8810-45af-a099-82c3f63bea07","shortId":"uCj3Cc","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 offers a suite of pay-per-request API endpoints gated by the x402 protocol on the Base network. This specific endpoint (`/api/v1/transactions/209`) is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract `0x8335…2913` on Base) at a cost of $0.02 per call (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\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 priced uniformly at $0.02 per request.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/209` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality this specific resource provides.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","post-method","no-api-key","no-rate-limits"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated API","402 payment endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The specific purpose and expected input/output of /api/v1/transactions/209 is unknown; 'Premium API Access' is the only description provided.","No OpenAPI schema or response examples are available anywhere on the site.","The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but provides zero detail on any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/209","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/transactions/209","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The purpose of this specific endpoint (/api/v1/transactions/209) is entirely undocumented, making it effectively a stub 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'/request':13,28 '0.02':12,27,79,156 '000':83 '0x8335':71 '20':82 '2913':72 '402':207 '402 payment endpoint' '6':87 'Base network API' 'USDC micropayment API' 'accept':62 'access':7,22,60 'across':114 'actual':197 'advertis':112 'ai':124 'analysi':128 'analyt':118 'api':6,21,40,59,90,165 'attach':101 'base':9,24,49,74,84 'base-network' 'broader':110 'call':4,19,81 'caller':99 'categori':116 'challeng':208 'classif':131 'commit':96 'confirm':202 'connect':174 'content':180 'contract':70 'convers':148 'cost':77 'crypto-gated API' 'data':117,121,216 'decim':88 'descript':191 'doc':164 'document':159,211 'embed':132 'endpoint':41,53,113,151,196,200 'estim':142 'exampl':188 'exchang':137 'export':122 'extrem':161 'feed':136 'financ':133 'four':115 'function':218 'gas':141 'gate':42 'generat':149 'geocod':146 'header':105 'infrastructur':144 'insight':123 'key':91 'learn':126 'limit':93 'list':56 'live':203 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':125 'metric':119 'network':50 'no-api-key' 'no-rate-limits' 'offer':32 'openapi':184 'page':169 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':65,104 'per':3,18,38,80,157 'per-request-billing' 'platform':111 'post':63 'post-method' 'premium':5,20,58 'price':135,153,166 'prompt':176 'proper':206 'protocol':46 'provid':222 'quot':140 'rate':92,138 'readm':168 'render':171 'report':120 'request':39,64,108,158 'request/response':187 'requir':98 'resourc':221 'return':198,204 'schema':185 'sentiment':127 'settl':67 'simpli':100 'spars':162 'specif':52,220 'suit':34 'summar':130 'text':129 'token':139 'unclear':214 'uniform':154 'unit':85 'upfront':95 'usdc':15,30,69 'usdc-settlement' 'util':145 'valid':147 'via':10,25 'wallet':175 'web3':134 'without':210 'x402':11,26,45,103 'x402 API' 'x402-payment'","prices":[{"id":"6cd96733-3cd6-48ce-9626-9bc0b5790a0b","listingId":"3dcb19a3-8810-45af-a099-82c3f63bea07","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/transactions/209","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:13.842Z"}],"sources":[{"listingId":"3dcb19a3-8810-45af-a099-82c3f63bea07","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/209","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:13.842Z","lastSeenAt":"2026-04-22T07:01:34.212Z"}],"details":{"listingId":"3dcb19a3-8810-45af-a099-82c3f63bea07","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/209 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/209"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/209"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium data or services without API key registration","Agent-driven workflows that need instant, keyless API access settled in USDC","Exploring x402 protocol integration for pay-per-call microservices"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can attach x402 payment headers and settle in USDC","Use cases requiring no-signup, no-rate-limit API access"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Production workloads requiring SLA guarantees or support channels","Callers who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.813Z"},"updatedAt":"2026-04-22T07:01:34.212Z"}}