{"id":"c5d33aaa-4f35-49da-a788-5468af72f2f7","shortId":"xEv7Wx","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/82` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 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 spec, no request/response schema documentation, and no example payloads available. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what request body the `/api/v1/transactions/82` endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","402 payment api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected input/output of /api/v1/transactions/82 is undocumented","The platform lists many endpoint categories but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/82","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific endpoint (/api/v1/transactions/82) is unclear beyond the generic 'Premium API Access' 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'/api/v1/transactions/82':56,209 '/docs':157 '/pricing':159 '/readme':161 '/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,92 'across':108 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85 'attach':95 'avail':187 'base':8,23,51,73 'base network api' 'bodi':207 'broader':104 'call':4,19,80 'categori':110 'challeng':67,198 'classif':125 'connect':167 'content':173 'convers':142 'data':111,115 'document':152,182,201 'embed':126 'endpoint':55,107,145,189,210 'estim':136 'exampl':185 'exchang':131 'expect':211 'export':116 'extrem':154 'feed':130 'financ':127 'four':109 'gas':135 'generat':143 'geocod':140 'header':99 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'learn':120 'limit':89 'list':58 'live':191 'low payment fee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':106 'openapi':177 'page':162 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payload':186 'payment':48,98 'per':3,18,36,79,150 'platform':6,21,39,82,105 'post-method' 'premium':60 'price':129,147 'prompt':169 'protocol':44 'quot':134 'rate':88,132 'render':164 'report':114 'request':37,68,102,151,206 'request/response':180 'respond':193 'return':64,215 'schema':181 'sentiment':121 'simpli':94 'spars':155 'spec':178 'specif':54 'summar':124 'text':123 'token':133 'unclear':204 'unit':74 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':139 'valid':141,196 'via':10,25 'wallet':168 'web3':128 'without':200 'x402':11,26,43,97,197 'x402 api' 'x402-payment'","prices":[{"id":"c76c1f6a-1bba-4225-9dee-308785b7cb1e","listingId":"c5d33aaa-4f35-49da-a788-5468af72f2f7","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:14.889Z"}],"sources":[{"listingId":"c5d33aaa-4f35-49da-a788-5468af72f2f7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:14.889Z","lastSeenAt":"2026-04-23T06:31:40.533Z"}],"details":{"listingId":"c5d33aaa-4f35-49da-a788-5468af72f2f7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/82 \\\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 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/82"},{"claim":"The platform advertises $0.02/request pricing 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":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to various utility and data endpoints without needing API key registration","Agent-driven workflows that pay per call using USDC on Base","Exploring x402 protocol integration for pay-as-you-go API consumption"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-request API access","Low-volume consumers who want no subscription commitments"],"notFor":["Production workloads requiring well-documented, stable API contracts","Users who need detailed request/response schemas before integration","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.635Z"},"updatedAt":"2026-04-23T06:31:40.533Z"}}