{"id":"2491b866-618a-4a89-a818-7d33da419a62","shortId":"xF3yHX","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides access to a specific transaction receipt (transaction ID 228) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/228/receipt` accepts POST requests and returns an `application/json` response. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys, rate limits, or subscriptions are required — access is purely pay-per-use.\n\nThe platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more, all at the same $0.02 price point. However, documentation beyond the landing page 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 example payloads available. The actual data returned by this receipt endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","transaction-receipt","json-response","no-api-key","no-rate-limit"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request and response formats are completely unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The endpoint is for a specific transaction ID (228); it is unclear whether other transaction IDs are available or what data the receipt contains","The broader platform advertises many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/228/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/228/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 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documented request or response schema, no example payloads, and the docs/pricing/README pages are all empty beyond a wallet connect prompt. The purpose of this specific receipt endpoint is unclear beyond its URL path. Effectively a stub 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'/api/v1/transactions/228/receipt':91 '/docs':195 '/pricing':197 '/readme':199 '0.02':10,24,77,137,182 '000':126 '0x8335':131 '20':125 '228':42 '2913':132 '6':141 'Base network API' 'USDC micropayment API' 'accept':92 'access':34,152 'actual':228 'addit':162 'advertis':161 'ai/ml':67 'amount':122 'analysi':166 'analyt':66 'api':63,144 'application/json':98 'avail':226 'base':8,22,86,127,134 'behind':43 'beyond':187 'broader':52 'call':79 'caller':107 'classif':169 'connect':205 'data':65,70,229 'decim':142 'detail':212 'document':186,221 'embed':170 'endpoint':6,20,30,90,163,234 'equal':136 'exampl':224 'exchang':173 'extrem':192 'feed':172 'finance/web3':69 'gate':3,17 'geocod':175 'given':138 'handl':102 'header':114 'howev':185 'id':41 'includ':109 'infer':68 'infrastructur':72 'json-response' 'key':145 'land':189 'limit':147 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':121 'must':108 'network':87 'no-api-key' 'no-rate-limit' 'offer':55 'openapi':216 'page':190,200 'part':49 'pay':9,23,60,156 'pay-per-call API' 'pay-per-request':59 'pay-per-us':155 'payload':225 'payment':100,113,118 'paywal':46 'per':13,27,61,78,157 'platform':53,160 'point':184 'post':93 'price':75,171,183 'prompt':207 'proof':119 'protocol':106 'provid':33 'pure':154 'rate':146,174 'receipt':5,19,39,233 'render':202 'request':14,28,62,94 'request/response':219 'requir':123,151 'respons':99 'return':96,230 'schema':220 'sentiment':165 'settl':81 'span':64 'spars':193 'spec':217 'specif':37,89 'subscript':149 'summar':168 'technic':211 'text':167 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'unit':128 'unknown':236 'usdc':12,26,83,130,139 'usdc-base' 'use':158 'util':73 'valid':117 'varieti':57 'via':103 'wallet':206 'x':112 'x-payment':111 'x402':2,16,45,105 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"713e17a4-81f7-429d-92e0-39cbb29207bc","listingId":"2491b866-618a-4a89-a818-7d33da419a62","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/228/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":"2026-04-18T18:59:17.511Z"}],"sources":[{"listingId":"2491b866-618a-4a89-a818-7d33da419a62","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/228/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:17.511Z","lastSeenAt":"2026-04-24T17:33:34.822Z"}],"details":{"listingId":"2491b866-618a-4a89-a818-7d33da419a62","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/228/receipt \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/228/receipt"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 228 via a single micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Programmatic access to transaction data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need one-off transaction receipt lookups","Use cases requiring keyless, pay-as-you-go API access on Base"],"notFor":["Bulk or high-volume transaction data retrieval (no documented batch support)","Users who need detailed API documentation or request/response schemas before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.687Z"},"updatedAt":"2026-04-24T17:33:34.822Z"}}