{"id":"2706f726-d350-4a06-9b31-09a51370653b","shortId":"KP2D2y","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 133) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, 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/133/receipt` accepts POST requests and returns `application/json`. Payment is made via the x402 exact scheme: the caller includes an `X-PAYMENT` header with a signed USDC payment on Base (contract `0x8335…2913`). The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.\n\nDocumentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema` stub, and no explanation of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage x402 showcase rather than a mature production API.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","per-request-billing","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","All documentation pages (docs, pricing, README, api) render only a 'Connect wallet' prompt with no content.","This appears to be a single hardcoded transaction ID (133); unclear if other transaction IDs are supported.","Platform may be a demo or early-stage project rather than a production service."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/133/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/133/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request body schema, and no example responses. The docs/pricing/README pages are all empty wallet-connect stubs. The specific resource (transaction 133 receipt) is opaque with no explanation of what it 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'0.02':71,133 '000':124 '0x8335':116 '133':40 '20':123 '2913':117 '402 payment required' '6':129 'Base network API' 'USDC pay-per-call' 'accept':86 'access':144 'actual':198 'advertis':53,143 'ai':60 'amount':120 'analyt':59 'api':55,137,160,218 'appear':202 'application/json':91 'base':8,22,80,114,125 'base-network' 'behind':41 'beyond':183 'broader':50 'call':12,26,135 'caller':101 'categori':56 'challeng':186 'connect':168 'contain':199 'content':174 'contract':115 'crypto payment API' 'data':58 'decim':130 'demonstr':206 'doc':158 'document':153 'earli':209 'early-stag':208 'endpoint':6,20,30,84 'equal':132 'exact':98 'explan':192 'extrem':155 'financ':63 'gate':3,17 'grant':146 'header':107 'id':39 'includ':57,102 'infrastructur':66 'key':138 'learn':62 'limit':141 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'made':94 'matur':216 'maximum':119 'micropay':152 'multipl':54 'network':81 'no-api-key' 'openapi':178 'outputschema':188 'page':163 'paid':9,23 'part':47 'payload':197 'payment':92,106,112 'paywal':44 'per':11,25,72,134,150 'per-cal':10,24 'per-request':149 'per-request-billing' 'platform':51,201 'post':87 'price':69,159 'product':217 'prompt':170 'provid':33 'pure':147 'rate':140 'rather':213 'readm':162 'receipt':5,19,36,196 'render':165 'request':73,88,151 'request/response':181 'requir':121 'resourc':37 'return':90 'schema':182 'scheme':99 'settl':75 'showcas':212 'sign':110 'spec':179 'specif':83 'stage':210 'stub':189 'substant':173 'thin':156 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':126 'usdc':14,28,77,111,128 'usdc-micropayment' 'util':67 'via':95 'wallet':169 'web3':64 'x':105 'x-payment':104 'x402':2,16,43,97,185,211 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"54f7fefe-bb66-40b3-bd6e-8e7c440af869","listingId":"2706f726-d350-4a06-9b31-09a51370653b","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/133/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":"2026-04-18T18:58:34.609Z"}],"sources":[{"listingId":"2706f726-d350-4a06-9b31-09a51370653b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/133/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:34.609Z","lastSeenAt":"2026-04-25T00:05:09.785Z"}],"details":{"listingId":"2706f726-d350-4a06-9b31-09a51370653b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/133/receipt \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\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 USDC payment on Base network with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/transactions/133/receipt"},{"claim":"The platform advertises multiple API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure) all at $0.02 per request.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform claims no API keys, no rate limits, and instant access with Base network settlement.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/transactions/133/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 133 via micropayment","Demonstrating x402 protocol payment flows on Base","Integrating pay-per-call USDC billing into agent workflows"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need to fetch transaction receipts without API keys","Testing USDC micropayment integrations on Base"],"notFor":["Production workloads requiring documented request/response schemas","Bulk or batch transaction receipt retrieval","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.683Z"},"updatedAt":"2026-04-25T00:05:09.785Z"}}