{"id":"7790f3b6-9c3e-42d7-ba16-45ab248a12ad","shortId":"X86jMT","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 a transaction receipt resource (transaction ID 67) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/67/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge specifying the USDC asset contract on Base (`0x8335…2913`), and must attach an `X-PAYMENT` header with a signed payment of up to 20,000 base units (i.e., $0.02 USDC, since USDC uses 6 decimals). No API keys or rate limits are advertised; access is purely pay-per-call.\n\nThe platform's documentation, pricing, and API reference pages all appear to require a wallet connection and contain no additional rendered content. There is no OpenAPI spec, no detailed schema documentation, and no example request/response payloads available from the crawl. The exact data returned by this receipt endpoint is unknown beyond the stated MIME type of `application/json`. The broader site lists many endpoints across several domains but provides no further technical detail about any of them.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","transaction-receipt","json-response"],"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 — response format is unknown beyond application/json","Endpoint is scoped to a single transaction ID (67); unclear if this is a demo or production resource","All documentation pages (docs, api, pricing, README) render only a wallet-connect prompt with no content","The broader platform lists many endpoints but provides zero technical detail for any of them","No robots.txt or agents.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/67/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/67/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation beyond a landing page, no example request/response, and the endpoint is scoped to a single hardcoded transaction ID (67). The docs/pricing/API pages all render only a wallet-connect prompt with no useful 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'0.02':71,133 '000':129 '0x8335':111 '20':128 '2913':112 '402':102 '6':138 '67':40 'Base network API' 'USDC micropayment API' 'accept':86 'access':148 'across':218 'addit':174 'advertis':53,147 'ai':60 'analyt':59 'api':55,141,161 'appear':165 'application/json':91,211 'asset':107 'attach':115 'avail':191 'base':8,22,80,110,130 'base-network' 'behind':41 'beyond':205 'broader':50,213 'call':12,26,154 'caller':99 'categori':56 'challeng':103 'connect':170 'contain':172 'content':176 'contract':108 'crawl':194 'data':58,197 'decim':139 'detail':183,226 'document':158,185 'domain':220 'endpoint':6,20,30,84,202,217 'exact':196 'exampl':188 'financ':63 'gate':3,17 'handl':94 'header':120 'i.e':132 'id':39 'includ':57 'infrastructur':66 'json-response' 'key':142 'learn':62 'limit':145 'list':215 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'mani':216 'mime':208 'multipl':54 'must':114 'network':81 'openapi':180 'page':163 'paid':9,23 'part':47 'pay':152 'pay-per-cal':151 'pay-per-call API' 'payload':190 'payment':92,119,124 'paywal':44 'per':11,25,72,153 'per-cal':10,24 'per-call-pricing' 'platform':51,156 'post':87 'price':69,159 'protocol':98 'provid':33,222 'pure':150 'rate':144 'receipt':5,19,36,201 'receiv':100 'refer':162 'render':175 'request':73,88 'request/response':189 'requir':167 'resourc':37 'return':90,198 'schema':184 'settl':75 'sever':219 'sign':123 'sinc':135 'site':214 'spec':181 'specif':83 'specifi':104 'state':207 'technic':225 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'type':209 'unit':131 'unknown':204 'usdc':14,28,77,106,134,136 'usdc-settlement' 'use':137 'util':67 'via':95 'wallet':169 'web3':64 'x':118 'x-payment':117 'x402':2,16,43,97 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8017f8bd-d395-44b2-9be3-56635e29a8b6","listingId":"7790f3b6-9c3e-42d7-ba16-45ab248a12ad","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/67/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":"2026-04-18T19:26:58.576Z"}],"sources":[{"listingId":"7790f3b6-9c3e-42d7-ba16-45ab248a12ad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/67/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:58.576Z","lastSeenAt":"2026-04-24T14:03:26.897Z"}],"details":{"listingId":"7790f3b6-9c3e-42d7-ba16-45ab248a12ad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/67/receipt\n# Returns 402 with x402 challenge. Attach X-PAYMENT header with signed USDC payment on Base to complete.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/67/receipt"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/67/receipt"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 67 via a micropayment-gated API call","Demonstrating x402 protocol integration for agent-to-agent commerce","Testing USDC micropayment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need to fetch transaction receipts with no API key setup","Low-friction pay-per-call access without subscriptions"],"notFor":["Production workloads requiring documented schemas and SLAs","Bulk retrieval of many different transaction receipts (endpoint is scoped to transaction 67)","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.433Z"},"updatedAt":"2026-04-24T14:03:26.897Z"}}