{"id":"095fdb8d-3c83-4bf5-93ce-1befc15c7609","shortId":"Q9HsAA","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 18) 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 gated via x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/transactions/18/receipt` accepts POST requests and returns JSON. The x402 challenge indicates a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — 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 documentation, and no usage examples available. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body is expected or what the receipt response contains. The platform appears to be a demonstration or early-stage x402 API marketplace.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","per-call-billing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment endpoint","402 payment required API"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or schema definition found","Purpose of '/api/v1/transactions/18/receipt' is unclear — may be a demo or placeholder","No request body schema or response schema documented","Platform appears to be early-stage or a demonstration site"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/18/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/18/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 challenge with clear pricing ($0.02 USDC on Base). However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of this 'transaction 18 receipt' endpoint is unclear. The listing is essentially a 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'/api/v1/transactions/18/receipt':82 '/docs':143 '/pricing':144 '/readme':147 '/request':121 '0.02':109,120 '000':98 '0x8335':103 '18':40 '20':97 '2913':104 '402':182 '402 payment required API' '6':114 'Base network API' 'USDC pay-per-call' 'accept':83 'across':123 'advertis':53,118 'ai':60 'analyt':59 'api':55,128,213 'appear':203 'avail':173 'base':8,22,75,99,106 'base-network' 'behind':41 'bodi':192 'broader':50 'call':12,26 'categori':56 'challeng':91,183 'commit':136 'confirm':177 'connect':153 'contain':200 'content':159 'crypto payment endpoint' 'data':58 'decim':115 'demonstr':207 'document':138,168,186 'earli':210 'early-stag':209 'endpoint':6,20,30,81,125,175 'equal':108 'exampl':172 'expect':194 'extrem':140 'financ':63 'gate':3,17,69 'id':39 'includ':57 'indic':92 'infrastructur':66 'json':88 'json-response' 'key':129 'learn':62 'limit':132 'live':178 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'marketplac':214 'maximum':94 'micropay':72 'minimum':135 'multipl':54 'network':76 'no-api-key' 'openapi':163 'page':148 'paid':9,23 'part':47 'payment':95 'paywal':44 'per':11,25,110 'per-cal':10,24 'per-call-billing' 'platform':51,117,202 'post':84 'price':122 'prompt':155 'proper':181 'provid':33 'rate':131 'receipt':5,19,36,198 'render':150 'request':85,111,191 'request/response':166 'requir':137 'resourc':37 'respons':199 'return':87,179 'schema':167 'spars':141 'spec':164 'specif':80 'stage':211 'substant':158 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unclear':189 'uniform':119 'unit':100 'usag':171 'usdc':14,28,78,102,112 'usdc-micropayment' 'use':77,113 'util':67 'via':70 'wallet':154 'web3':64 'without':185 'x402':2,16,43,71,90,212 'x402 micropayment API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8b6a7e89-674a-4883-bb11-96980adced86","listingId":"095fdb8d-3c83-4bf5-93ce-1befc15c7609","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/18/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":"2026-04-18T18:58:55.204Z"}],"sources":[{"listingId":"095fdb8d-3c83-4bf5-93ce-1befc15c7609","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/18/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:55.204Z","lastSeenAt":"2026-04-24T21:32:28.919Z"}],"details":{"listingId":"095fdb8d-3c83-4bf5-93ce-1befc15c7609","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/18/receipt \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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/18/receipt"},{"claim":"Platform advertises $0.02/request pricing across all endpoints with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/18/receipt"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction receipts via micropayment-gated API calls","Demonstrating x402 protocol payment flows on Base network","Integrating pay-per-call APIs without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Projects requiring USDC micropayment-gated endpoints"],"notFor":["Production workloads requiring documented request/response schemas","Users who need detailed API documentation or SDKs","High-volume use cases where per-call pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.639Z"},"updatedAt":"2026-04-24T21:32:28.919Z"}}