{"id":"cde32319-b659-4d77-994b-b0e5d0e9c44d","shortId":"LWNc6X","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific transaction receipt (transaction ID 286) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint probed (/api/v1/transactions/286/receipt) returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equates to $0.02 per call — consistent with the site's advertised pricing. Payment is made via the x402 \"exact\" scheme, with a 300-second timeout. No API keys or rate limits are required; access is granted purely through on-chain payment.\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 payload actually contains. The endpoint is live and responding with a proper 402 challenge, but the lack of documentation makes it difficult to know what data is returned or what input parameters (if any) the POST body should contain.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","no-rate-limit"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The endpoint targets a specific transaction ID (286) — unclear if this is a demo or a real resource","No request body schema or response schema documented anywhere","The broader platform advertises many API categories (AI, analytics, finance, utilities) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/286/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/286/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 consistent with advertised $0.02 USDC pricing on Base. However, there is no OpenAPI spec, no documentation of request parameters or response schema, and no examples. The docs pages are empty. The endpoint path suggests a single fixed resource (transaction 286) rather than a general-purpose API, which limits 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'/api/v1/transactions/286/receipt':110 '/docs':183 '/pricing':185 '/readme':187 '0.02':92,138 '000':121 '0x8335':126 '20':120 '286':42 '2913':127 '300':158 '402':228 '6':133 'Base network API' 'USDC micropayment API' 'access':34,169 'actual':217 'advertis':51,146 'ai/ml':63 'analysi':66 'analyt':62 'api':59,162 'base':8,22,100,122,129 'base-network' 'behind':43 'bodi':252 'broader':48 'call':12,26,140 'chain':176 'challeng':115,229 'classif':68 'connect':193 'consist':141 'contain':218,254 'content':199 'convers':85 'crypto payment endpoint' 'data':61,71,241 'decim':134 'difficult':237 'document':178,208,234 'embed':69 'endpoint':6,20,30,88,108,220 'equat':136 'estim':79 'exact':154 'exampl':211 'exchang':74 'extrem':180 'feed':73 'finance/web3':70 'gas':78 'gate':3,17 'generat':86 'geocod':83 'grant':171 'id':41 'infer':64 'infrastructur':81 'input':246 'key':163 'know':239 'lack':232 'limit':166 'live':222 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':150 'make':235 'maxamountrequir':118 'network':101 'no-api-key' 'no-rate-limit' 'on-chain':174 'openapi':203 'page':188 'paid':9,23 'paramet':247 'pay':56 'pay-per-call API' 'pay-per-request':55 'payload':216 'payment':148,177 'paywal':46 'per':11,25,57,93,139 'per-cal':10,24 'platform':50 'post':251 'price':72,90,147 'probe':109 'prompt':195 'proper':227 'protocol':105 'provid':33 'pure':172 'quot':77 'rate':75,165 'receipt':5,19,39,215 'render':190 'request':58,94 'request/response':206 'requir':168 'respond':224 'return':111,243 'schema':207 'scheme':155 'second':159 'sentiment':65 'settl':95 'sinc':130 'site':144 'span':60 'spars':181 'spec':204 'specif':37,107 'substant':198 'suit':53 'summar':67 'timeout':160 'token':76 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'unit':123 'usdc':14,28,97,125,131 'usdc-settlement' 'use':132 'util':82 'valid':84,113 'via':102,151 'wallet':194 'x402':2,16,45,104,114,153 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"dc9c290b-a140-4dfd-8f1d-d70251518e60","listingId":"cde32319-b659-4d77-994b-b0e5d0e9c44d","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/286/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":"2026-04-18T18:59:54.565Z"}],"sources":[{"listingId":"cde32319-b659-4d77-994b-b0e5d0e9c44d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/286/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:54.565Z","lastSeenAt":"2026-04-24T13:03:15.598Z"}],"details":{"listingId":"cde32319-b659-4d77-994b-b0e5d0e9c44d","quickStartSnippet":"# 1. Send POST to get the 402 challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/286/receipt\n# Returns 402 with x402 payment challenge\n# 2. Construct X-PAYMENT header with USDC payment proof on Base\n# 3. Resend POST with X-PAYMENT header to receive the receipt","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/286/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 286 via programmatic payment","Demonstrating x402 protocol integration for pay-per-request APIs","Accessing financial or transactional data without API key registration"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that can settle USDC payments on Base for per-call API access","Use cases requiring keyless, permissionless API access"],"notFor":["Production workloads requiring documented request/response schemas","Users without USDC on the Base network","Bulk data retrieval where per-request pricing is cost-prohibitive"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.082Z"},"updatedAt":"2026-04-24T13:03:15.598Z"}}