{"id":"f106c4b4-6d32-4d40-b972-ba79a7d12989","shortId":"fFvgn2","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 (transaction ID 212) 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 infrastructure utilities — all priced at $0.02 per call and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/212/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is gated purely by micropayment.\n\nThe platform's landing page lists 16 endpoints across four categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure), all at the same $0.02 price point. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail, so the actual response schema and request body format for this receipt endpoint are unknown. The endpoint is live and returning a proper 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","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 lookup","payment-gated API"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet'","Request body schema and response schema are completely unknown","The specific purpose and content of the transaction 212 receipt is undocumented","No OpenAPI or machine-readable schema provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/212/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/212/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 402 challenge, confirming it works. However, there is no OpenAPI schema, no documented request/response format, and the docs/pricing/README pages all returned only 'Connect wallet' with no usable content. The purpose of this specific receipt endpoint is unclear beyond its URL path. Effectively a stub 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'0.02':10,24,75,135,178 '000':124 '0x8335':129 '16':161 '20':123 '212':40 '2913':130 '402':221 '6':139 'Base network API' 'USDC pay-per-call' 'accept':90 'access':149 'across':163 'actual':200 'advertis':119,148 'ai':168 'ai/ml':65 'analyt':64,167 'api':61,142 'base':8,22,84,125,132 'base-network' 'behind':41 'beyond':183 'bodi':205 'broader':50 'call':77 'caller':103 'categori':165 'challeng':118,222 'connect':190 'data':63,68,166 'decim':140 'detail':197 'document':181 'endpoint':6,20,30,88,162,210,214 'equal':134 'financ':171 'finance/web3':67 'format':206 'four':164 'gate':3,17,151 'given':136 'handl':98 'header':110 'id':39 'includ':105 'infer':66 'infrastructur':70,173 'json':95 'json-response' 'key':143 'land':158,185 'learn':170 'limit':146 'list':160 'live':216 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':169 'maxamountrequir':121 'micropay':154 'must':104 'network':85 'no-api-key' 'offer':53 'page':159,182,186 'part':47 'pay':9,23,58 'pay-per-request':57 'payment':96,109,114 'payment-gated API' 'paywal':44 'per':13,27,59,76 'platform':51,156 'point':180 'post':91 'price':73,179 'prompt':192 'proof':115 'proper':220 'protocol':102 'provid':33 'pure':152 'rate':145 'receipt':5,19,36,209 'receipt lookup' 'request':14,28,60,92,204 'resourc':37 'respons':201 'return':94,187,218 'schema':202 'settl':79 'span':62 'specif':87 'technic':196 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':126 'unknown':212 'usdc':12,26,81,128,137 'usdc-micropayment' 'util':71 'valid':113 'varieti':55 'via':99 'wallet':191 'web3':172 'x':108 'x-payment':107 'x402':2,16,43,101,117 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"48448284-cd77-45ff-9d6c-83f8420af90c","listingId":"f106c4b4-6d32-4d40-b972-ba79a7d12989","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/212/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":"2026-04-18T18:59:15.057Z"}],"sources":[{"listingId":"f106c4b4-6d32-4d40-b972-ba79a7d12989","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/212/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:15.057Z","lastSeenAt":"2026-04-24T18:33:04.756Z"}],"details":{"listingId":"f106c4b4-6d32-4d40-b972-ba79a7d12989","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/212/receipt \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","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 maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/212/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/212/receipt"},{"claim":"All APIs are 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":"The platform lists 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 212 via micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Programmatic access to receipt data without API key management"],"bestFor":["Developers experimenting with x402 micropayment protocol","Agents that need on-demand receipt retrieval with no subscription","Projects already operating on the Base L2 network with USDC"],"notFor":["Bulk retrieval of many transaction receipts (no batch endpoint documented)","Users who need detailed API documentation or response schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.839Z"},"updatedAt":"2026-04-24T18:33:04.756Z"}}