{"id":"8c2f8175-ac6e-44b5-a132-2470c335b880","shortId":"3GyDdV","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 338) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/338/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the accepted payment scheme (exact), the USDC asset contract on Base (`0x8335…`), and a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). No API keys are required; access is granted per-request upon valid payment. The platform advertises no rate limits and instant access.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema`, and no examples of what the receipt payload actually contains. The platform lists many other endpoints across analytics, AI, finance, and utility categories, but this listing covers only the `/api/v1/transactions/338/receipt` resource.","tags":[],"capabilities":["x402-payment","usdc-base","transaction-receipt","per-request-billing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema describing the receipt response body — callers cannot know what they will receive before paying.","Endpoint is scoped to a single transaction ID (338); unclear if other transaction IDs are available or how to discover them.","The platform lists many other endpoints (AI, analytics, finance, utils) but none were probed; their availability is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/338/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/338/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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what the receipt payload contains. The endpoint path is specific to a single transaction ID (338), making its general utility 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'/api/v1/transactions/338/receipt':83,220 '/docs':159 '/pricing':160 '/readme':163 '0.02':10,24,70,125 '000':121 '0x8335':114 '20':120 '338':40 '402':100 '6':129 'Base network API' 'USDC micropayment API' 'accept':84,104 'access':136,153 'across':207 'actual':199 'addit':174 'advertis':53,147 'ai':59,209 'amount':118 'analyt':58,208 'api':55,132 'application/json':89 'asset':110 'base':8,22,78,113,122 'behind':41 'beyond':185 'broader':50 'caller':97 'categori':56,213 'challeng':101,188 'connect':169 'contain':102,200 'content':176 'contract':111 'cover':217 'data':57 'decim':130 'document':154 'endpoint':6,20,30,82,206 'exact':107 'exampl':193 'extrem':156 'financ':62,210 'gate':3,17 'given':126 'grant':138 'handl':92 'i.e':124 'id':39 'infrastructur':65 'instant':152 'json-response' 'key':133 'learn':61 'limit':150 'list':203,216 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':60 'mani':204 'maximum':117 'multipl':54 'network':79 'no-api-key' 'openapi':180 'outputschema':190 'page':164 'part':47 'pay':9,23 'pay-per-call API' 'payload':198 'payment':90,105,144 'paywal':44 'per':13,27,71,140 'per-request':139 'per-request-billing' 'platform':51,146,202 'post':85 'price':68 'prompt':171 'protocol':96 'provid':33 'rate':149 'receipt':5,19,36,197 'receiv':98 'render':166 'request':14,28,72,86,141 'request/response':183 'requir':135 'resourc':37,221 'return':88 'schema':184 'scheme':106 'settl':73 'spars':157 'spec':181 'specif':81 'technic':175 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':123 'upon':142 'usdc':12,26,75,109,127 'usdc-base' 'util':66,212 'valid':143 'via':93 'wallet':170 'web3':63 'x402':2,16,43,95,187 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a754d413-f2b9-4aa8-b263-cf59e4f92354","listingId":"8c2f8175-ac6e-44b5-a132-2470c335b880","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/338/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":"2026-04-18T19:26:13.172Z"}],"sources":[{"listingId":"8c2f8175-ac6e-44b5-a132-2470c335b880","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/338/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:13.172Z","lastSeenAt":"2026-04-24T09:04:27.587Z"}],"details":{"listingId":"8c2f8175-ac6e-44b5-a132-2470c335b880","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/338/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC payment to receive the receipt.","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, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/transactions/338/receipt"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/transactions/338/receipt"}],"useCases":["Retrieving a receipt for a specific transaction (ID 338) via programmatic payment","Demonstrating x402 protocol integration for per-request micropayments","Agents that need to fetch financial transaction records without pre-registered API keys"],"bestFor":["Developers experimenting with x402 payment flows on Base","Agents needing keyless, pay-per-call access to transaction data","Micropayment-based API consumption without subscriptions"],"notFor":["Bulk retrieval of many transaction receipts (only one transaction ID exposed)","Users who need detailed API documentation or response schemas before integrating","Production workloads requiring SLA guarantees or documented error handling"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.529Z"},"updatedAt":"2026-04-24T09:04:27.587Z"}}