{"id":"3332bde4-ba46-45ba-a92d-950c9ebf0871","shortId":"espwXD","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 a transaction receipt resource 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 utility services — all priced at $0.02 per call and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/216/receipt` returns a JSON receipt for transaction ID 216. The x402 challenge confirms it accepts POST requests, requires an exact payment of 20,000 base-unit USDC (i.e., $0.02 given USDC's 6 decimals) to wallet `0x1A2B…85F3`, and responds with `application/json`. No API keys or rate limits are advertised; access is gated purely by the x402 micropayment protocol.\n\nThe platform's landing page lists additional endpoints across four categories — Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All share the same $0.02 per-request pricing. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this and sibling endpoints remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","receipt endpoint","402 payment API"],"warnings":["No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet' with no technical content.","The exact request body schema and response format for this endpoint are unknown; example_request_json and example_response_json are null.","This endpoint is for a single transaction ID (216); it is unclear whether other transaction IDs are available or how they are discovered.","The broader platform lists many endpoints but none have been individually verified beyond this one."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/216/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/216/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no documentation beyond a landing page, no example request/response payloads, and the docs/pricing/README pages all return only a wallet-connect prompt. The specific purpose of this receipt endpoint is only inferable from its URL 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'0.02':10,24,72,115,191 '000':109 '0x1a2b':123 '20':108 '216':94 '402 payment API' '6':119 '85f3':124 'Base network API' 'USDC pay-per-call' 'accept':100 'access':137 'across':154 'actual':215 'addit':152 'advertis':136 'ai':163 'ai/ml':62 'analysi':167 'analyt':61,158 'api':58,130 'application/json':128 'base':8,22,81,111 'base-unit':110 'behind':38 'beyond':198 'broader':47 'call':74 'categori':156 'challeng':97 'classif':169 'confirm':98 'connect':205 'convers':185 'data':60,65,157 'decim':120 'detail':212 'document':196 'embed':170 'endpoint':6,20,30,85,153,222 'estim':180 'exact':105 'exchang':175 'export':161 'feed':174 'financ':171 'finance/web3':64 'four':155 'gas':179 'gate':3,17,139 'generat':186 'geocod':183 'given':116 'i.e':114 'id':93 'infer':63 'infrastructur':182 'insight':162 'json':89 'json-response' 'key':131 'land':149,200 'learn':165 'limit':134 'list':151 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':164 'metric':159 'micropay':144 'network':82 'no-api-key' 'offer':50 'page':150,197,201 'part':44 'pay':9,23,55 'pay-per-request':54 'payment':106 'paywal':41 'per':13,27,56,73,193 'per-request':192 'platform':48,147 'post':101 'price':70,173,195 'prompt':207 'protocol':145 'provid':33 'pure':140 'quot':178 'rate':133,176 'receipt':5,19,36,90 'receipt endpoint' 'remain':223 'report':160 'request':14,28,57,102,194 'request/response':216 'requir':103 'resourc':37 'respond':126 'return':87,202 'schema':217 'sentiment':166 'servic':68 'settl':76 'share':188 'sibl':221 'span':59 'specif':84 'summar':168 'technic':211 'token':177 'transact':4,18,35,92 'transaction receipt API' 'transaction-receipt' 'undocu':224 'unit':112 'usdc':12,26,78,113,117 'usdc-base' 'util':67 'valid':184 'varieti':52 'wallet':122,206 'web3':172 'x402':2,16,40,96,143 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8f13abe8-53ab-4070-a640-dbfb09b22f8a","listingId":"3332bde4-ba46-45ba-a92d-950c9ebf0871","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/216/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":"2026-04-18T18:59:14.457Z"}],"sources":[{"listingId":"3332bde4-ba46-45ba-a92d-950c9ebf0871","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/216/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:14.457Z","lastSeenAt":"2026-04-24T18:33:04.755Z"}],"details":{"listingId":"3332bde4-ba46-45ba-a92d-950c9ebf0871","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/216/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to proceed.","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 20,000 base-unit USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/216/receipt"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/216/receipt"}],"useCases":["Retrieving a transaction receipt for a specific transaction ID via micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Agents autonomously purchasing transaction data without API key provisioning"],"bestFor":["Developers exploring x402 micropayment protocol integrations","AI agents that need to fetch transaction receipts without pre-registered credentials","Low-volume, on-demand access to transaction data at $0.02 per call"],"notFor":["High-volume bulk transaction data retrieval (no documented batch endpoints)","Users who need detailed API documentation or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.841Z"},"updatedAt":"2026-04-24T18:33:04.755Z"}}