{"id":"001da7c8-700b-4ff4-a181-42ca6bef0f52","shortId":"GDTXxQ","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 131) 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, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/131/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 specifies an \"exact\" scheme with a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation pages (/docs, /pricing, /api, /README) all resolve to minimal \"Connect wallet\" stubs, so there is no detailed schema documentation, request/response examples, or explanation of what the receipt payload actually contains. The endpoint is live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know exactly what data is returned.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) return only 'Connect wallet' with no actual content","No request body schema or response schema is documented anywhere","The specific resource (transaction 131 receipt) is opaque — unclear what data it returns or what input it expects","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/131/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/131/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 challenge with clear pricing, but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The purpose of the specific receipt endpoint is unclear beyond its name. Effectively a stub 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'/api/v1/transactions/131/receipt':88 '/docs':172 '/pricing':173 '/readme':175 '0.02':10,24,75,139 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':133 '131':40 '20':127 '2913':134 '300':154 '402':208 '6':143 'Base network API' 'USDC micropayment API' 'accept':89 'access':168 'actual':199 'address':150 'advertis':159 'ai/ml':65 'amount':125 'analyt':64 'api':61,161 'base':8,22,83,129,136 'base-network' 'behind':41 'broader':50 'call':77 'caller':102 'challeng':117,209 'connect':180 'contain':200 'crypto payment endpoint' 'data':63,68,222 'decim':144 'detail':187 'difficult':217 'direct':148 'document':170,189,214 'endpoint':6,20,30,87,202 'equal':138 'exact':120,220 'exampl':191 'explan':193 'finance/web3':67 'gate':3,17 'given':140 'handl':97 'header':109 'howev':169 'id':39 'includ':104 'infer':66 'infrastructur':70 'instant':167 'json':94 'json-response' 'key':162 'know':219 'lack':212 'limit':165 'live':204 'lowpaymentfee' 'lowpaymentfee.com':32 'make':215 'max':124 'minim':179 'must':103 'network':84 'no-api-key' 'offer':53 'page':171 'part':47 'pay':9,23,58 'pay-per-call API' 'pay-per-request':57 'payload':198 'payment':95,108,113,146 'paywal':44 'per':13,27,59,76 'platform':51,158 'post':90 'price':73 'proof':114 'proper':207 'protocol':101 'provid':33 'rate':164 'receipt':5,19,36,197 'request':14,28,60,91 'request/response':190 'resolv':177 'resourc':37 'return':93,205,224 'schema':188 'scheme':121 'second':155 'settl':78 'span':62 'specif':86 'specifi':118 'stub':182 'timeout':156 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':130 'usdc':12,26,80,132,141 'usdc-settlement' 'util':71 'valid':112 'varieti':55 'via':98 'wallet':181 'x':107 'x-payment':106 'x402':2,16,43,100,116 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"cff7d5ab-f9cb-4711-b844-fbc160443d89","listingId":"001da7c8-700b-4ff4-a181-42ca6bef0f52","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/131/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":"2026-04-18T18:58:23.775Z"}],"sources":[{"listingId":"001da7c8-700b-4ff4-a181-42ca6bef0f52","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/131/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:23.775Z","lastSeenAt":"2026-04-25T01:32:59.790Z"}],"details":{"listingId":"001da7c8-700b-4ff4-a181-42ca6bef0f52","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/131/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/131/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/131/receipt"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages resolve to minimal 'Connect wallet' stubs","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 131 via a micropayment-gated API","Demonstrating x402 protocol integration for pay-per-request services","Programmatic access to receipt data without traditional API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base for per-call API access","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume batch processing where per-request fees add up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.21Z"},"updatedAt":"2026-04-25T01:32:59.790Z"}}