{"id":"8e260b35-2d83-4d5b-b5f4-c539635bd62c","shortId":"nPQE9z","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 219) 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/219/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","per-request-micropayment","transaction-receipt","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","pay-per-call API","USDC payment API","Base network API","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty — only showing 'Connect wallet'","No request or response schema is documented for this or any endpoint on the platform","The endpoint path references a specific transaction ID (219); it is unclear whether this is a generic pattern or a single fixed resource","The broader platform lists many API categories (AI, finance, analytics, etc.) but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/219/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/219/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 with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and all documentation pages are empty stubs. The specific purpose of this receipt endpoint is unclear beyond its URL 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'0.02':10,24,75,133 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x8335':127 '20':121 '219':40 '2913':128 '300':148 '402':215 '6':137 'Base network API' 'USDC payment API' 'accept':89 'address':144 'advertis':117 'ai/ml':65 'analyt':64 'api':61,158 'base':8,22,83,123,130 'behind':41 'beyond':173 'bodi':196 'broader':50 'call':60 'caller':102 'challeng':116,216 'commit':165 'confirm':210 'connect':187 'data':63,68 'decim':138 'document':172 'empti':179 'endpoint':6,20,30,87,204,208 'equal':132 'essenti':178 'exact':192 'finance/web3':67 'gate':3,17 'given':134 'handl':97 'header':109 'howev':171 'id':39 'includ':104 'infer':66 'json':94 'json-response' 'key':159 'land':175 'limit':162 'live':211 'lowpaymentfee' 'lowpaymentfee.com':32 'market':153 'maxamountrequir':119 'micropay':170 'must':103 'network':84 'offer':53 'page':176,183 'part':47 'pay':9,23,58 'pay-per-cal':57 'pay-per-call API' 'payload':199 'payment':95,108,113,140 'paywal':44 'per':13,27,59,76,168 'per-request':167 'per-request-micropayment' 'platform':51,152 'post':90 'post-method' 'price':73 'prompt':189 'proof':114 'protocol':101 'provid':33 'rate':161 'receipt':5,19,36 'request':14,28,77,91,169,195 'requir':156 'resourc':37 'respons':198,217 'return':93 'schema':193 'second':149 'sent':142 'servic':71 'settl':78 'show':185 'span':62 'specif':86 'sub':182 'sub-pag':181 'timeout':150 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'undocu':206 'unit':124 'usdc':12,26,80,126,135 'usdc-base' 'util':70 'valid':112,214 'varieti':55 'via':98,212 'wallet':188 'x':107 'x-payment':106 'x402':2,16,43,100 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"17974f7d-74c5-4ef2-9f67-d4383433da61","listingId":"8e260b35-2d83-4d5b-b5f4-c539635bd62c","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/219/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":"2026-04-18T18:59:12.657Z"}],"sources":[{"listingId":"8e260b35-2d83-4d5b-b5f4-c539635bd62c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/219/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:12.657Z","lastSeenAt":"2026-04-24T18:33:04.737Z"}],"details":{"listingId":"8e260b35-2d83-4d5b-b5f4-c539635bd62c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/219/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/219/receipt"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/219/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 219 via a single micropayment","Demonstrating x402 protocol integration for pay-per-call services","Programmatic access to receipt data without API key management"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need on-demand receipt retrieval without subscription overhead","Applications already holding USDC on Base that want frictionless API access"],"notFor":["Users needing bulk or batch transaction receipt retrieval (no documented batch endpoint)","Anyone requiring detailed API documentation or guaranteed SLAs (docs are essentially empty)","Use cases requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.846Z"},"updatedAt":"2026-04-24T18:33:04.737Z"}}