{"id":"c85cd915-c41a-4530-baf6-088fb133f3be","shortId":"cwrdj8","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 182) 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 and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/182/receipt` accepts POST requests and returns an `application/json` response. 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 scheme is \"exact\" 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. Documentation pages (/docs, /pricing, /api) appear to require a wallet connection and contain no additional readable content. There is no OpenAPI spec, no detailed schema documentation, and no example request/response bodies available from the crawl. The actual data returned by this receipt endpoint is unknown beyond its JSON MIME type.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available","Documentation pages (/docs, /pricing, /api) return only a wallet-connect prompt with no readable content","The specific data returned by this receipt endpoint is unknown — only the MIME type (application/json) is confirmed","This appears to be a single transaction-specific receipt endpoint (transaction 182); unclear if it generalizes"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/182/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/182/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page, no example request/response bodies, and the specific purpose of this receipt endpoint is opaque. The docs/pricing/api pages all render only a wallet-connect prompt with no useful 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'/api/v1/transactions/182/receipt':89 '/docs':174 '/pricing':175 '0.02':10,24,75,136 '000':125 '0x8335':130 '182':40 '20':124 '2913':131 '300':149 '6':140 'Base network API' 'USDC micropayment API' 'accept':90 'actual':208 'addit':186 'advertis':120 'ai/ml':65 'analyt':64 'api':61,159 'appear':177 'application/json':96 'avail':203 'base':8,22,84,126,133 'base-network' 'behind':41 'beyond':217 'bodi':202 'broader':50 'call':60 'caller':105 'challeng':119 'commit':166 'connect':182 'contain':184 'content':188 'crawl':206 'data':63,68,209 'decim':141 'detail':195 'document':172,197 'endpoint':6,20,30,88,214 'equal':135 'exact':146 'exampl':200 'finance/web3':67 'gate':3,17 'given':137 'handl':100 'header':112 'id':39 'includ':107 'infer':66 'json':219 'json-response' 'key':160 'limit':163 'lowpaymentfee' 'lowpaymentfee.com':32 'market':154 'maxamountrequir':122 'micropay':171 'mime':220 'must':106 'network':85 'no-api-key' 'offer':53 'openapi':192 'page':173 'part':47 'pay':9,23,58 'pay-per-cal':57 'pay-per-call API' 'pay-per-request' 'payment':98,111,116,143 'paywal':44 'per':13,27,59,76,169 'per-request':168 'platform':51,153 'post':91 'price':73 'proof':117 'protocol':104 'provid':33 'rate':162 'readabl':187 'receipt':5,19,36,213 'request':14,28,77,92,170 'request/response':201 'requir':157,179 'resourc':37 'respons':97 'return':94,210 'schema':196 'scheme':144 'second':150 'servic':71 'settl':79 'span':62 'spec':193 'specif':87 'timeout':151 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'type':221 'unit':127 'unknown':216 'usdc':12,26,81,129,138 'usdc-micropayment' 'util':70 'valid':115 'varieti':55 'via':101 'wallet':181 'x':110 'x-payment':109 'x402':2,16,43,103 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"963c0794-7a67-4805-83b6-08e3f6702656","listingId":"c85cd915-c41a-4530-baf6-088fb133f3be","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/182/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":"2026-04-18T18:58:58.823Z"}],"sources":[{"listingId":"c85cd915-c41a-4530-baf6-088fb133f3be","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/182/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:58.823Z","lastSeenAt":"2026-04-24T20:03:14.096Z"}],"details":{"listingId":"c85cd915-c41a-4530-baf6-088fb133f3be","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/182/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 network","source_url":"https://lowpaymentfee.com/api/v1/transactions/182/receipt"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/182/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 182 via micropayment","Demonstrating x402 protocol integration for agent-to-API payments","Accessing pay-per-request infrastructure services without API key management"],"bestFor":["Developers exploring x402 protocol micropayments","Agents that need to purchase API access on-the-fly with USDC on Base","Projects requiring keyless, per-call API access"],"notFor":["Bulk data retrieval where per-request fees add up quickly","Users without a Base-compatible wallet or USDC balance","Anyone needing detailed API documentation or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.6Z"},"updatedAt":"2026-04-24T20:03:14.096Z"}}