{"id":"01f19e0e-7b75-4c9b-ab4f-9c124fdd962d","shortId":"yJr3uh","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 on the platform, which offers a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities—all priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/215` is listed under the platform's offerings but its exact functionality is not documented beyond the generic \"Premium API Access\" label. The x402 challenge confirms it accepts POST requests, charges up to 20,000 base units of USDC (i.e., $0.02 given 6 decimals) per call, and settles payments to a specified wallet on Base. The platform advertises no API keys, no rate limits, and instant access—payment is the only authentication mechanism.\n\nDocumentation is extremely sparse. 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 examples of what this particular endpoint returns. The broader platform appears to be a demonstration or early-stage deployment of x402-gated microservices.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-gated API"],"warnings":["No documentation available for this specific endpoint's functionality or expected input/output","All documentation pages return only 'Connect wallet' with no technical content","The endpoint name 'transactions/215' suggests a resource-specific path but its purpose is undocumented","No OpenAPI spec or schema available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/215","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/215","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what the endpoint actually does, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect 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'/request':15,32 '0.02':14,31,77,130 '000':124 '20':123 '6':132 'Base network API' 'USDC micropayment endpoint' 'accept':117 'access':7,24,42,110,156 'advertis':147 'ai':66 'analyt':65 'api':6,23,41,62,109,149,169 'appear':207 'authent':161 'base':9,26,85,125,144 'beyond':105 'broader':205 'call':4,21,135 'challeng':114 'charg':120 'confirm':115 'connect':178 'crypto-gated API' 'data':64 'decim':133 'demonstr':211 'deploy':216 'detail':185 'doc':168 'document':104,163,194 'earli':214 'early-stag':213 'endpoint':36,53,89,202 'exact':100 'exampl':197 'extrem':165 'financ':69 'function':101 'gate':220 'generic':107 'given':131 'i.e':129 'infrastructur':72 'instant':155 'key':150 'label':111 'learn':68 'limit':153 'list':92 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':67 'mani':52 'mechan':162 'microservic':221 'network':86 'no-api-key' 'offer':58,97 'one':50 'openapi':189 'page':173 'paid':80 'particular':201 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':46,138,157 'per':3,20,78,134 'platform':56,95,146,206 'post':118 'post-method' 'premium':5,22,40,108 'price':75,170 'prompt':180 'protocol':12,29,47 'provid':39 'rate':152 'readm':172 'render':175 'request':79,119 'request/response':192 'return':203 'schema':193 'settl':137 'span':63 'spars':166 'spec':190 'specif':88 'specifi':141 'stage':215 'suit':60 'technic':184 'unit':126 'usdc':17,34,82,128 'usdc-base' 'util':73 'via':10,27,43 'wallet':142,179 'web3':70 'x402':11,28,45,113,219 'x402 API' 'x402-gated':218 'x402-payment'","prices":[{"id":"2f09bb33-b192-4172-b172-aa129cf48c03","listingId":"01f19e0e-7b75-4c9b-ab4f-9c124fdd962d","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/215","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:10.864Z"}],"sources":[{"listingId":"01f19e0e-7b75-4c9b-ab4f-9c124fdd962d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/215","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:10.864Z","lastSeenAt":"2026-04-24T18:33:04.693Z"}],"details":{"listingId":"01f19e0e-7b75-4c9b-ab4f-9c124fdd962d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/215 \\\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 charges up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/215"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs in categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services without traditional API key registration","Demonstrating x402 protocol payment flows for agent-to-agent commerce","Making one-off paid API calls settled in USDC on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-use API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or trial access before committing payment","Anyone needing detailed SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.928Z"},"updatedAt":"2026-04-24T18:33:04.693Z"}}