{"id":"5626ccb9-88f5-48eb-b85a-0e8d98377d7f","shortId":"sEEn43","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 339) 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 infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/339/receipt` accepts POST requests and returns an `application/json` response. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header containing a valid payment proof for 20,000 base-unit USDC (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet, with a maximum timeout of 300 seconds. No API keys or rate limits are advertised; access is purely pay-per-request.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 `outputSchema` stub, and no examples of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage deployment of x402-based micropayment APIs.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","payment receipt endpoint","crypto micropayment API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no usable content.","The endpoint is scoped to a single transaction ID (339); it is unclear whether other transaction IDs are supported or how to discover them.","The broader platform lists many API categories (AI, analytics, finance, utils) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/339/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/339/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 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no documented request body or response schema, and all secondary pages (docs, pricing, README) render only a wallet-connect prompt. The specific resource (transaction 339 receipt) is narrow and unexplained. Effectively a stub 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'0.02':10,24,75,126 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '20':119 '300':147 '339':40 '6':130 'Base network API' 'USDC pay-per-call' 'accept':90 'access':157 'actual':211 'addit':187 'address':137 'advertis':156 'ai/ml':65 'analyt':64 'api':61,150,174,230 'appear':215 'application/json':96 'base':8,22,84,122,140,228 'base-unit':121 'behind':41 'beyond':198 'broader':50 'call':60 'caller':105 'connect':182 'contain':113,212 'crypto micropayment API' 'data':63,68 'decim':131 'demonstr':219 'deploy':224 'detail':189 'doc':172 'document':164 'earli':222 'early-stag':221 'endpoint':6,20,30,88 'exampl':205 'extrem':169 'finance/web3':67 'gate':3,17 'handl':100 'header':112 'i.e':125 'id':39 'includ':107 'infer':66 'infrastructur':70 'json-response' 'key':151 'limit':154 'lowpaymentfee' 'lowpaymentfee.com':32 'mainnet':141 'maximum':144 'micropay':229 'must':106 'network':85 'no-api-key' 'offer':53 'openapi':193 'outputschema':201 'page':177 'part':47 'pay':9,23,58,161 'pay-per-cal':57 'pay-per-request':160 'payload':210 'payment':98,111,116,133 'payment receipt endpoint' 'paywal':44 'per':13,27,59,76,162 'platform':51,214 'post':91 'price':73,173 'prompt':184 'proof':117 'protocol':104 'provid':33 'pure':159 'rate':153 'readm':176 'receipt':5,19,36,209 'render':179 'request':14,28,77,92,163 'request/response':196 'resourc':37 'respons':97 'return':94 'schema':197 'second':148 'sent':135 'settl':79 'sinc':127 'site':167 'span':62 'spec':194 'specif':87 'stage':223 'stub':202 'technic':188 'thin':170 'timeout':145 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':123 'usdc':12,26,81,124,128 'usdc-base' 'use':129 'util':71 'valid':115 'varieti':55 'via':101 'wallet':183 'x':110 'x-payment':109 'x402':2,16,43,103,200,227 'x402 micropayment' 'x402-based':226 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8ed07b99-296d-4695-bdfd-23d42f45b7f8","listingId":"5626ccb9-88f5-48eb-b85a-0e8d98377d7f","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/339/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":"2026-04-18T19:26:08.309Z"}],"sources":[{"listingId":"5626ccb9-88f5-48eb-b85a-0e8d98377d7f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/339/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:08.309Z","lastSeenAt":"2026-04-24T09:04:27.299Z"}],"details":{"listingId":"5626ccb9-88f5-48eb-b85a-0e8d98377d7f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/339/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 requiring 20,000 base-unit USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/transactions/339/receipt"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, API, and README pages render only a 'Connect wallet' prompt with no additional content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 339 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 protocol payments","Agents that need keyless, pay-per-call API access on Base","Prototyping micropayment-gated data retrieval"],"notFor":["Production workloads requiring documented request/response schemas","Bulk or high-volume receipt retrieval (no batch endpoint visible)","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.86Z"},"updatedAt":"2026-04-24T09:04:27.299Z"}}