{"id":"90a3e25d-3f45-46f4-b0a4-806c4853e0bf","shortId":"CATfYc","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 395) 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 (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, with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint probed (/api/v1/transactions/395/receipt) returns a valid x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 \"exact\" scheme to the specified payTo address, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage deployment of x402-based micropayment APIs rather than a mature production service.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-pricing","transaction-receipt","json-response","no-api-key","micropayment"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No OpenAPI or schema documentation available — all docs pages render only 'Connect wallet'","No request body schema or response schema documented; unclear what the receipt contains","This appears to be a single transaction-specific endpoint (transaction 395) rather than a general-purpose API","Platform may be a demo or early-stage deployment; maturity is uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/395/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/395/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 with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples of what the receipt payload contains. The docs pages are empty. This is effectively a stub 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'/api/v1/transactions/395/receipt':117 '/docs':188 '/pricing':190 '/readme':192 '0.02':92,147 '000':131 '0x8335':136 '20':130 '2913':137 '300':172 '395':42 '402':124 '402 payment required' '6':143 'Base network API' 'USDC pay-per-call' 'accept':177 'access':34 'actual':222 'address':169 'advertis':51,155 'ai/ml':63 'analysi':66 'analyt':62 'api':59,104,241 'appear':226 'application/json':182 'base':8,22,100,132,139,239 'behind':43 'broader':48 'call':12,26,149 'challeng':122 'classif':68 'commit':112 'connect':198 'consist':150 'contain':223 'content':204 'convers':85 'crypto payment API' 'data':61 'decim':144 'demonstr':230 'deploy':235 'document':183,213 'earli':233 'early-stag':232 'embed':69 'endpoint':6,20,30,88,115,176 'equal':146 'estim':79 'exact':163 'exampl':216 'exchang':74 'extrem':185 'feed':73 'financ':70 'gas':78 'gate':3,17 'generat':86 'geocod':83 'http':123 'id':41 'infer':64 'infrastructur':81 'json-response' 'key':105 'limit':108 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':159 'matur':245 'micropay':240 'micropayment' 'minimum':111 'network':101 'no-api-key' 'openapi':208 'page':193 'paid':9,23 'pay':56 'pay-per-request':55 'payload':221 'payment':126,157 'payto':168 'paywal':46 'per':11,25,57,93,148 'per-cal':10,24 'per-request-pricing' 'platform':50,225 'post':178 'price':72,90,156 'probe':116 'product':246 'prompt':200 'provid':33 'quot':77 'rate':75,107 'rather':242 'receipt':5,19,39,220 'render':195 'request':58,94,125,179 'request/response':211 'return':118,181 'schema':212 'scheme':164 'second':173 'sentiment':65 'servic':247 'settl':95 'sinc':140 'site':153 'span':60 'spars':186 'spec':209 'specif':37,114 'specifi':167 'stage':234 'suit':53 'summar':67 'timeout':174 'token':76 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'unit':133 'usdc':14,28,97,135,141 'usdc-base' 'use':142 'util':82 'valid':84,120 'via':160 'wallet':199 'web3':71 'x402':2,16,45,121,162,238 'x402 micropayment' 'x402-based':237 'x402-gated':1,15 'x402-payment'","prices":[{"id":"916a9902-1ac5-47e5-99b4-b74eae1b98f9","listingId":"90a3e25d-3f45-46f4-b0a4-806c4853e0bf","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/395/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":"2026-04-18T19:26:49.025Z"}],"sources":[{"listingId":"90a3e25d-3f45-46f4-b0a4-806c4853e0bf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/395/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:49.025Z","lastSeenAt":"2026-04-24T04:04:20.279Z"}],"details":{"listingId":"90a3e25d-3f45-46f4-b0a4-806c4853e0bf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/395/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment to complete the request.","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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/395/receipt"},{"claim":"Platform offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 395 via micropayment","Demonstrating x402 protocol-based API monetization","Agent-driven pay-per-call data retrieval without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Testing micropayment-gated API workflows"],"notFor":["Production workloads requiring documented request/response schemas","Users needing bulk or subscription-based access at lower per-call cost","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.846Z"},"updatedAt":"2026-04-24T04:04:20.279Z"}}