{"id":"a1b9bb5b-cba0-4f61-84ad-6746b9da43db","shortId":"WAfzZC","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/transfers/22` 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 listed at the same $0.02/request price point.\n\nHowever, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality of the `/api/v1/transfers/22` endpoint (labeled \"Premium API Access\") is unclear — it does not appear in the homepage's listed API catalog, and its purpose cannot be determined from the available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API gateway"],"warnings":["The endpoint /api/v1/transfers/22 does not appear in the provider's own listed API catalog — its specific functionality is unknown.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content.","No OpenAPI spec, no request/response examples, and no schema documentation available.","The purpose and expected input/output of this endpoint cannot be determined from available material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/22","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/transfers/22","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, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/transfers/22 is undocumented and absent from the site's own API catalog. This is effectively a stub 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,203 'across':108 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,162,202,215 'appear':209 'attach':95 'avail':192,225 'base':8,23,51,73 'broader':104 'call':4,19,80 'cannot':220 'catalog':216 'categori':110 'challeng':67 'classif':125 'connect':171 'convers':142 'crypto API gateway' 'data':111,115 'detail':178 'determin':222 'doc':161 'document':156,187 'embed':126 'endpoint':55,107,145,199 'estim':136 'exampl':190 'exchang':131 'export':116 'extrem':158 'feed':130 'financ':127 'four':109 'function':195 'gas':135 'generat':143 'geocod':140 'header':99 'homepag':212 'howev':155 'http-post' 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'label':200 'learn':120 'limit':89 'list':58,147,214 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'materi':226 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':182 'page':166 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':191 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'premium':60,201 'price':129,153,163 'prompt':173 'protocol':44 'purpos':219 'quot':134 'rate':88,132 'readm':165 'render':168 'report':114 'request':37,68,102 'request/response':185 'return':64 'schema':186 'sentiment':121 'simpli':94 'spec':183 'specif':54,194 'summar':124 'technic':177 'text':123 'thin':159 'token':133 'unclear':205 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':172 'web3':128 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"96901945-12eb-43b4-bcab-ed0731289541","listingId":"a1b9bb5b-cba0-4f61-84ad-6746b9da43db","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/transfers/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:48.218Z"}],"sources":[{"listingId":"a1b9bb5b-cba0-4f61-84ad-6746b9da43db","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:48.218Z","lastSeenAt":"2026-04-22T15:02:25.259Z"}],"details":{"listingId":"a1b9bb5b-cba0-4f61-84ad-6746b9da43db","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/22 \\\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":"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/transfers/22"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.","source_url":"https://lowpaymentfee.com/api/v1/transfers/22"}],"useCases":["Accessing pay-per-request API endpoints without needing API keys or subscriptions","Making micropayment-gated HTTP calls settled in USDC on Base","Integrating agent-purchasable endpoints into automated workflows"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to bulk plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.025Z"},"updatedAt":"2026-04-22T15:02:25.259Z"}}