{"id":"1090fdd4-ae0d-41ff-9e48-e4fcb28a39f2","shortId":"Yxhzxa","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, priced at $0.02 in USDC.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, priced at $0.02 in USDC.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a \"Premium API Access\" receipt resource for transaction ID 299. It is part of a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all settled on the Base network using USDC at $0.02 per request via the x402 protocol.\n\nThe specific endpoint `/api/v1/transactions/299/receipt` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) to wallet 0x1A2B…85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nDocumentation beyond the landing page is extremely thin — 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 usage examples available from the crawl. The exact purpose of a \"transaction receipt\" endpoint is unclear — it may return a receipt or proof-of-payment for a prior transaction, but this is speculative given the lack of documentation.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","transaction-receipt","json-response","no-api-key","micropayment"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","Base USDC API","pay-per-call API","lowpaymentfee","receipt endpoint","crypto payment API"],"warnings":["No documentation available beyond the landing page; /docs, /pricing, /api, /README all show only 'Connect wallet'","No OpenAPI or schema definition found for request or response payloads","The specific purpose of /api/v1/transactions/299/receipt is unclear — it may be a demo or placeholder endpoint","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/299/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/299/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 documentation is essentially nonexistent — all subpages render only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific receipt endpoint is unclear. The listing is effectively a 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'/api/v1/transactions/299/receipt':96 '/docs':160 '/pricing':162 '/readme':164 '0.02':14,30,86,127 '000':116 '0x1a2b':130 '0x8335':121 '20':115 '2913':122 '299':50 '300':134 '6':125 '85f3':131 'Base USDC API' 'accept':97 'access':44,145 'advertis':144 'ai/ml':70 'analyt':69 'api':43,65,138 'avail':191 'base':9,25,81,117,124 'beyond':152 'broader':56 'call':4,20 'challeng':105 'confirm':106 'connect':170 'crawl':194 'crypto payment API' 'data':68,73 'decim':126 'detail':177 'document':151,186,227 'dozen':59 'enabl':36 'endpoint':7,23,37,66,95,202 'exact':112,196 'exampl':190 'extrem':157 'finance/web3':72 'gate':147 'given':223 'id':49 'infer':71 'infrastructur':75 'json':102 'json-response' 'key':139 'lack':225 'land':154 'limit':142 'live':109 'lowpaymentfee' 'lowpaymentfee.com':39 'may':206 'micropay':150 'micropayment' 'network':82 'no-api-key' 'offer':58 'openapi':181 'page':155,165 'part':53 'pay':2,18,62 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':61 'payment':113,214 'per':3,19,63,87 'platform':57 'post':98 'premium':42 'price':12,28 'prior':217 'prompt':172 'proof':212 'proof-of-pay':211 'protocol':92 'provid':40 'pure':148 'purpos':197 'rate':141 'receipt':6,22,45,201,209 'receipt endpoint' 'render':167 'request':64,88,99 'request/response':184 'requir':110 'resourc':46 'return':101,207 'schema':185 'second':135 'settl':78 'span':67 'spec':182 'specif':94 'specul':222 'technic':176 'thin':158 'timeout':136 'transact':5,21,48,200,218 'transaction receipt API' 'transaction-receipt' 'unclear':204 'unit':118 'usag':189 'usdc':16,32,84,120 'usdc-base' 'use':83 'util':76 'via':10,26,89 'wallet':129,171 'x402':11,27,35,91,104 'x402 micropayment endpoint' 'x402-enabled':34 'x402-payment'","prices":[{"id":"8ed1ce2d-7810-4f94-9880-7d62cc430e73","listingId":"1090fdd4-ae0d-41ff-9e48-e4fcb28a39f2","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/299/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":"2026-04-18T19:25:50.767Z"}],"sources":[{"listingId":"1090fdd4-ae0d-41ff-9e48-e4fcb28a39f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/299/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:50.767Z","lastSeenAt":"2026-04-24T12:04:10.099Z"}],"details":{"listingId":"1090fdd4-ae0d-41ff-9e48-e4fcb28a39f2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/299/receipt \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/transactions/299/receipt"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a receipt or proof-of-payment for a specific transaction","Agent-driven micropayment workflows that need on-chain settlement","Programmatic access to transaction data without API key management"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need keyless, pay-per-call API access on Base","Use cases requiring USDC-settled API calls with no subscription"],"notFor":["Production workloads requiring documented request/response schemas","Bulk or high-volume data retrieval where per-call pricing is inefficient","Users who need fiat payment rails or non-crypto settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.615Z"},"updatedAt":"2026-04-24T12:04:10.099Z"}}