{"id":"033b6f3b-4ad6-449d-876d-182de5b44b83","shortId":"t2G7uL","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 at `/api/v1/transactions/290` is labeled \"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 $0.02 per request.\n\nHowever, documentation 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/290` endpoint actually returns. The endpoint is live (confirmed via 402 challenge), but without documentation it is unclear what data or functionality it provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition for any endpoint.","The specific purpose of /api/v1/transactions/290 ('Premium API Access') is undocumented — it is unclear what data it returns.","No request or response examples available anywhere in crawled material.","The platform lists many endpoint categories (AI, finance, data, infrastructure) but provides zero detail on any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/290","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/290","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of the specific /api/v1/transactions/290 endpoint is unknown. This is effectively a stub 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'/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66,199 '402 payment API' 'Base network API' 'USDC API' 'accept':46 'access':62,92 'across':108 'actual':191 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,159 'attach':95 'base':8,23,51,73 'broader':104 'call':4,19,80 'categori':110 'challeng':67,200 'classif':125 'confirm':197 'connect':168 'content':174 'convers':142 'data':111,115,208 'descript':185 'doc':158 'document':153,203 'embed':126 'endpoint':55,107,145,190,194 'estim':136 'exampl':182 'exchang':131 'export':116 'extrem':155 'feed':130 'financ':127 'four':109 'function':210 'gas':135 'generat':143 'geocod':140 'header':99 'howev':152 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'label':59 'learn':120 'limit':89 'list':147 'live':196 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':106 'openapi':178 'page':163 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,150 'platform':6,21,39,82,105 'post-method' 'premium':60 'price':129,160 'prompt':170 'protocol':44 'provid':212 'quot':134 'rate':88,132 'readm':162 'render':165 'report':114 'request':37,68,102,151 'request/response':181 'return':64,192 'schema':179 'sentiment':121 'simpli':94 'spars':156 'specif':54 'summar':124 'text':123 'token':133 'unclear':206 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25,198 'wallet':169 'web3':128 'without':202 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"1f0f2c27-952e-417c-91fe-e55433d8330a","listingId":"033b6f3b-4ad6-449d-876d-182de5b44b83","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/290","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:47.716Z"}],"sources":[{"listingId":"033b6f3b-4ad6-449d-876d-182de5b44b83","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/290","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:47.716Z","lastSeenAt":"2026-04-23T14:31:35.112Z"}],"details":{"listingId":"033b6f3b-4ad6-449d-876d-182de5b44b83","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/290 \\\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/transactions/290"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/290"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or transaction information via a single paid HTTP call","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations with low-cost endpoints"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need frictionless, keyless API access","Low-volume, pay-per-use API consumption without subscriptions"],"notFor":["Production workloads requiring well-documented, schema-validated APIs","Users who need free or subscription-based access without per-call crypto payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.774Z"},"updatedAt":"2026-04-23T14:31:35.112Z"}}