{"id":"b22a4184-92d2-48dc-beb0-6eb90f3307de","shortId":"kUtVFF","kind":"x402","title":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. Each request costs $0.02 in USDC on the Base network, with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/transactions/168` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a payment of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, which is 6 decimals = $0.02) to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The timeout for payment settlement is 300 seconds.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no description of what the `/api/v1/transactions/168` endpoint specifically returns. The platform advertises many endpoints but provides no public documentation on input parameters or response formats for any of them.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","post-method"],"categories":["api-gateway","finance"],"synonyms":["low payment fee","x402 api","micropayment api","base network api","usdc pay-per-call","transactions api","crypto payment api"],"warnings":["No documentation available — docs/API/pricing/README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","Purpose of /api/v1/transactions/168 is unclear — 'Premium API Access' is generic","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/168","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/168","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 via 402 challenge with clear pricing ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, what inputs it accepts, or what it returns. No OpenAPI spec, no examples, no request/response schemas 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'/request':15,32 '0.02':14,31,75,125 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':128 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':118 '20':112 '300':135 '6':123 'accept':95 'access':7,24,42 'addit':157 'advertis':181 'ai':64 'analyt':63 'api':6,23,41,84,143 'base':9,26,80,114,120 'base network api' 'call':4,21 'categori':60 'challeng':103 'commit':89 'confirm':104 'connect':152 'cost':74 'crypto payment api' 'data':62 'decim':124 'descript':171 'detail':159 'doc':142 'document':137,168,188 'endpoint':36,53,93,176,183 'extrem':139 'financ':67 'format':194 'includ':61 'infrastructur':70 'input':190 'json':100 'json-response' 'key':85 'learn':66 'limit':87 'live':107 'low payment fee' 'lowpaymentfee.com':38 'machin':65 'mani':52,182 'micropayment api' 'network':81 'offer':54 'one':50 'openapi':163 'page':147 'paramet':191 'pay':2,19 'pay-per-cal':1,18 'pay-per-request' 'payment':46,110,132 'per':3,20 'platform':57,180 'post':96 'post-method' 'premium':5,22,40 'price':144 'prompt':154 'protocol':12,29,47 'provid':39,185 'public':187 'rate':86 'readm':146 'render':149 'request':73,97 'request/response':166 'requir':90,108 'respons':193 'return':99,178 'schema':167 'second':136 'settlement':133 'span':59 'spars':140 'spec':164 'specif':92,177 'technic':158 'timeout':130 'transactions api' 'unit':115 'usdc':17,34,77,117 'usdc pay-per-call' 'usdc-base-network' 'util':71 'via':10,27,43 'wallet':127,153 'web3':68 'x402':11,28,45,102 'x402 api' 'x402-payment'","prices":[{"id":"714adc5b-b5b4-42fb-8e0a-e135214241ba","listingId":"b22a4184-92d2-48dc-beb0-6eb90f3307de","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:00.021Z"}],"sources":[{"listingId":"b22a4184-92d2-48dc-beb0-6eb90f3307de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/168","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:00.021Z","lastSeenAt":"2026-04-22T13:31:46.694Z"}],"details":{"listingId":"b22a4184-92d2-48dc-beb0-6eb90f3307de","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/168 \\\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 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/168"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, 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/168"}],"useCases":["Accessing premium data or transaction information without API key registration","Programmatic pay-per-call access for agents or bots on Base network","Testing x402 protocol integrations with low-cost endpoints"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments autonomously","Users who prefer pay-per-use over subscription models"],"notFor":["Users who need detailed API documentation before integrating","Applications requiring high-throughput with predictable monthly billing","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.523Z"},"updatedAt":"2026-04-22T13:31:46.694Z"}}