{"id":"2c88d9cb-75c6-4b7c-997b-e11e3e48d3de","shortId":"YrBHdQ","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 (specifically for transaction ID 128) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/128/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 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 what data is returned or what input the POST body expects.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","pay-per-request","USDC micropayment API","Base network API","lowpaymentfee","402 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 endpoint is scoped to a single transaction ID (128); unclear if other transaction IDs are available at similar paths","No OpenAPI spec or AI plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/128/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/128/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. However, there is no OpenAPI schema, no request/response documentation, and all doc pages are empty stubs. The specific resource (transaction 128 receipt) is narrow and unexplained, making it hard for agents to use without 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'/api/v1/transactions/128/receipt':90 '/docs':168 '/pricing':169 '/readme':171 '0.02':10,24,77,135 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':129 '128':42 '20':123 '2913':130 '300':150 '402':204 '402 payment endpoint' '6':139 'Base network API' 'USDC micropayment API' 'accept':91 'access':164 'actual':195 'address':146 'advertis':119,155 'ai/ml':67 'analyt':66 'api':63,157 'base':8,22,85,125,132 'base-network' 'behind':43 'bodi':225 'broader':52 'call':62 'caller':104 'challeng':118,205 'connect':176 'contain':196 'data':65,70,217 'decim':140 'detail':183 'difficult':213 'document':166,185,210 'endpoint':6,20,30,89,198 'equal':134 'exampl':187 'expect':226 'explan':189 'finance/web3':69 'gate':3,17 'given':136 'handl':99 'header':111 'howev':165 'id':41 'includ':106 'infer':68 'input':222 'instant':163 'json':96 'key':158 'know':215 'lack':208 'limit':161 'live':200 'lowpaymentfee' 'lowpaymentfee.com':32 'make':211 'maxamountrequir':121 'minim':175 'must':105 'network':86 'no-api-key' 'offer':55 'page':167 'part':49 'pay':9,23,60 'pay-per-cal':59 'pay-per-call' 'pay-per-request' 'payload':194 'payment':97,110,115,142 'paywal':46 'per':13,27,61,78 'platform':53,154 'post':92,224 'price':75 'proof':116 'proper':203 'protocol':103 'provid':33 'rate':160 'receipt':5,19,36,193 'request':14,28,79,93 'request/response':186 'resolv':173 'resourc':37 'return':95,201,219 'schema':184 'second':151 'sent':144 'servic':73 'settl':80 'span':64 'specif':38,88 'stub':178 'timeout':152 'transact':4,18,35,40 'transaction receipt API' 'transaction-receipt' 'unit':126 'usdc':12,26,82,128,137 'usdc-settlement' 'util':72 'valid':114 'varieti':57 'via':100 'wallet':177 'x':109 'x-payment':108 'x402':2,16,45,102 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"2a3053d7-fec9-4e91-9aa2-1bbdeecf39b9","listingId":"2c88d9cb-75c6-4b7c-997b-e11e3e48d3de","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/128/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":"2026-04-18T18:58:27.361Z"}],"sources":[{"listingId":"2c88d9cb-75c6-4b7c-997b-e11e3e48d3de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/128/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:27.361Z","lastSeenAt":"2026-04-25T01:32:59.957Z"}],"details":{"listingId":"2c88d9cb-75c6-4b7c-997b-e11e3e48d3de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/128/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/128/receipt"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/128/receipt"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, 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 128 via a single micropayment","Demonstrating x402 protocol integration for pay-per-call APIs","Agent-driven retrieval of financial transaction data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that need keyless, pay-per-call access to transaction data","Projects requiring USDC-settled micropayment API patterns"],"notFor":["Production use requiring well-documented request/response schemas","Bulk retrieval of many transaction receipts (only transaction 128 is exposed at this URL)","Users who need fiat or non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.022Z"},"updatedAt":"2026-04-25T01:32:59.957Z"}}