{"id":"a100d9e6-7f9b-4573-9a57-094e86032af9","shortId":"Ktf5eX","kind":"x402","title":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","tagline":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource at `/api/v1/transactions/223/receipt`. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all settled via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint probed returns a 402 challenge requesting payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is made via the x402 \"exact\" scheme to a designated wallet address. The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt endpoint actually returns. The endpoint is live (402 challenge confirmed), but the lack of documentation makes it difficult to know what data is returned or what input parameters are expected beyond a POST request.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","transaction-receipt","pay-per-use"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","receipt endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific resource '/api/v1/transactions/223/receipt' is hardcoded to transaction ID 223 — unclear if this is parameterized or a single fixed resource","No response examples or field definitions available; unknown what data the receipt contains","Platform lists many other endpoints on its homepage but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/223/receipt","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/223/receipt","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 challenge, but there is virtually no documentation: no OpenAPI spec, no request/response examples, no description of what the receipt contains. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/transactions/223/receipt':37 '/docs':147 '/pricing':149 '/readme':151 '0.02':96,123 '000':91 '20':90 '402':83,187 '6':101 'Base network API' 'USDC pay-per-call' 'across':126 'actual':181 'address':117 'advertis':120 'ai/ml':58 'analyt':57 'api':54,132 'base':5,18,73,92 'base-network' 'beyond':210 'broader':43 'call':9,22,53,104 'challeng':84,188 'commit':140 'confirm':189 'connect':157 'content':163 'data':56,61,201 'decim':102 'design':115 'difficult':197 'document':142,172,194 'endpoint':3,16,28,79,129,180,184 'exact':111 'exampl':175 'expect':209 'extrem':144 'finance/web3':60 'flat':122 'infer':59 'infrastructur':63 'input':206 'key':133 'know':199 'lack':192 'limit':136 'live':186 'lowpaymentfee' 'lowpaymentfee.com':30 'made':107 'make':195 'micropayment API' 'minimum':139 'network':74 'offer':46 'openapi':167 'page':152 'paid':6,19 'paramet':207 'part':40 'pay':51 'pay-per-cal':50 'pay-per-use' 'payment':86,105 'per':8,21,52,103,124 'per-cal':7,20 'per-call-pricing' 'platform':44,119 'post':212 'probe':80 'prompt':159 'protocol':70 'provid':31 'rate':135 'receipt':2,15,34,179 'receipt endpoint' 'render':154 'request':85,125,213 'request/response':170 'requir':141 'resourc':35 'return':81,182,203 'schema':171 'scheme':112 'settl':66 'sinc':98 'span':55 'spars':145 'spec':168 'specif':78 'substant':162 'transact':1,14,33 'transaction receipt API' 'transaction-receipt' 'unit':93 'usd':97 'usdc':13,26,76,95,99 'usdc-settlement' 'use':75,100 'util':64 'varieti':48 'via':10,23,67,108 'wallet':116,158 'x402':11,24,69,110 'x402 API' 'x402-payment'","prices":[{"id":"00769bed-c6f0-4b46-b638-023f99ad2194","listingId":"a100d9e6-7f9b-4573-9a57-094e86032af9","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/223/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:19.912Z"}],"sources":[{"listingId":"a100d9e6-7f9b-4573-9a57-094e86032af9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/223/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:19.912Z","lastSeenAt":"2026-04-24T17:03:04.705Z"}],"details":{"listingId":"a100d9e6-7f9b-4573-9a57-094e86032af9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/223/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/223/receipt"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 corresponds to USDC on Base","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction ID 223 via a paid API call","Programmatic access to receipt data without API key management","Agent-driven workflows that need on-chain payment settlement per request"],"bestFor":["Developers wanting keyless, pay-per-call API access on Base","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or response schema before integrating","High-volume use cases where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.502Z"},"updatedAt":"2026-04-24T17:03:04.705Z"}}