{"id":"48ec3d5b-3573-4c80-ba38-fbcf61543d8b","shortId":"aPxmAD","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/388` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 at $0.02 per request.\n\nHowever, the specific endpoint probed here (`/api/v1/transactions/388`) does not clearly map to any of the documented API categories. Its description is simply \"Premium API Access,\" and no schema, documentation, or example responses are available for this particular path. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation, the actual functionality behind this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto API access"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content","The endpoint path /api/v1/transactions/388 does not match any of the documented API categories on the landing page","No request or response schema is provided; actual functionality is unknown","No OpenAPI spec, ai-plugin manifest, or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/388","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/388","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what this specific endpoint actually does. The docs pages returned only 'Connect wallet' with no content. This is effectively a stub 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'/request':13,28 '0.02':12,27,80,151 '000':74 '20':73 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,178 'actual':213 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,170,177 'attach':93 'avail':187 'base':8,23,51,75 'behind':215 'broader':106 'call':4,19,82 'caller':91 'categori':111,171 'challeng':67 'classif':127 'clear':163 'connect':202 'content':208 'convers':144 'crypto API access' 'data':113,117 'descript':173 'doc':193 'document':169,182,211 'embed':128 'endpoint':55,147,157,217 'estim':138 'exampl':184 'exchang':133 'export':118 'feed':132 'financ':129 'function':214 'gas':137 'generat':145 'geocod':142 'header':98 'howev':154 'http-post' 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'json-response' 'key':85 'learn':122 'limit':88 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'map':164 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'page':197 'particular':190 'path':191 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,97,103 'per':3,18,36,81,152 'platform':6,21,39,107 'premium':60,176 'price':131,149,194 'probe':158 'prompt':204 'proof':104 'protocol':44 'quot':136 'rate':87,134 'readm':196 'remain':218 'report':116 'request':37,153 'requir':68,90 'respons':185 'return':64,199 'schema':181 'sentiment':123 'simpli':92,175 'specif':54,156 'substant':207 'summar':126 'text':125 'token':135 'unclear':219 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':203 'web3':130 'without':209 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"2c7325a4-f37e-4d05-922f-868dd50cdc75","listingId":"48ec3d5b-3573-4c80-ba38-fbcf61543d8b","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/388","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:49.624Z"}],"sources":[{"listingId":"48ec3d5b-3573-4c80-ba38-fbcf61543d8b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/388","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:49.624Z","lastSeenAt":"2026-04-23T08:31:55.662Z"}],"details":{"listingId":"48ec3d5b-3573-4c80-ba38-fbcf61543d8b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/388 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/transactions/388"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/388"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need to pay per call using on-chain USDC","Accessing premium data or services with micropayments on Base L2"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Low-friction micropayment API consumption"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.847Z"},"updatedAt":"2026-04-23T08:31:55.662Z"}}