{"id":"4ae1f943-07a1-46f6-8543-ed7200edbafb","shortId":"85MjuU","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 146) 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/146/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 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform markets itself as requiring no API keys, no rate limits, and no commitments — just per-request micropayments. However, documentation beyond the landing page is essentially empty (all sub-pages only show a \"Connect wallet\" prompt), so the exact schema of request bodies and response payloads for this and other endpoints is undocumented. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt","payment receipt","x402 API","micropayment API","Base USDC API","lowpaymentfee","pay-per-call API"],"warnings":["No API documentation available — all doc/pricing/README pages return only a 'Connect wallet' prompt with no content.","Request and response schemas are completely undocumented; callers must guess at the POST body format.","The endpoint is for a specific transaction ID (146); it is unclear whether this is a demo or a production resource.","The broader platform lists many endpoints (AI, finance, analytics) but none have documented schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/146/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/146/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema documentation, and all doc pages are empty stubs. The specific purpose of this receipt endpoint is unclear beyond its URL path. Effectively a stub 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'0.02':10,24,75,134 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':128 '146':40 '20':122 '2913':129 '300':149 '402':216 '6':138 'Base USDC API' 'accept':90 'address':145 'advertis':118 'ai/ml':65 'analyt':64 'api':61,159 'base':8,22,84,124,131 'behind':41 'beyond':174 'bodi':197 'broader':50 'call':77 'caller':103 'challeng':117,217 'commit':166 'confirm':211 'connect':188 'data':63,68 'decim':139 'document':173 'empti':180 'endpoint':6,20,30,88,205,209 'equal':133 'essenti':179 'exact':193 'finance/web3':67 'gate':3,17 'given':135 'handl':98 'header':110 'howev':172 'id':39 'includ':105 'infer':66 'infrastructur':70 'json':95 'json-response' 'key':160 'land':176 'limit':163 'live':212 'lowpaymentfee' 'lowpaymentfee.com':32 'market':154 'maxamountrequir':120 'micropay':171 'micropayment API' 'must':104 'network':85 'no-api-key' 'offer':53 'page':177,184 'part':47 'pay':9,23,58 'pay-per-call API' 'pay-per-request':57 'payload':200 'payment':96,109,114,141 'payment receipt' 'paywal':44 'per':13,27,59,76,169 'per-request':168 'platform':51,153 'post':91 'price':73 'prompt':190 'proof':115 'protocol':102 'provid':33 'rate':162 'receipt':5,19,36 'request':14,28,60,92,170,196 'requir':157 'resourc':37 'respons':199,218 'return':94 'schema':194 'second':150 'sent':143 'settl':79 'show':186 'span':62 'specif':87 'sub':183 'sub-pag':182 'timeout':151 'transact':4,18,35,38 'transaction receipt' 'transaction-receipt' 'undocu':207 'unit':125 'usdc':12,26,81,127,136 'usdc-base' 'util':71 'valid':113,215 'varieti':55 'via':99,213 'wallet':189 'x':108 'x-payment':107 'x402':2,16,43,101 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"0d98b8f7-04bd-4e49-943d-bbc53b25e83a","listingId":"4ae1f943-07a1-46f6-8543-ed7200edbafb","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/146/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":"2026-04-18T18:58:40.617Z"}],"sources":[{"listingId":"4ae1f943-07a1-46f6-8543-ed7200edbafb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/146/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:40.617Z","lastSeenAt":"2026-04-24T22:32:56.250Z"}],"details":{"listingId":"4ae1f943-07a1-46f6-8543-ed7200edbafb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/146/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/146/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/146/receipt"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and no commitments","source_url":"https://lowpaymentfee.com"},{"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 146 via a single micropayment","Programmatic access to receipt data without traditional API key management","Agent-driven workflows that need on-chain-settled API calls"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need to fetch transaction receipts with no subscription overhead","Low-volume, on-demand receipt retrieval on Base network"],"notFor":["High-volume batch receipt retrieval (no documented bulk endpoints)","Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.407Z"},"updatedAt":"2026-04-24T22:32:56.250Z"}}