{"id":"3cc0e091-18f6-4e72-8deb-c1ec428fe514","shortId":"emdNMz","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 201) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/201/receipt` accepts POST requests and returns JSON. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, 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. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual functionality behind the paywall and the structure of the response are unknown beyond the description \"Premium API Access\" and the mime type application/json.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto payment endpoint"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The actual response payload structure is unknown — no examples or schema provided","The specific purpose of 'transaction 201 receipt' is undocumented","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/201/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/201/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty stubs. The actual functionality behind the paywall is unclear beyond the generic label 'Premium API Access'. This is effectively a stub 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'0.02':10,24,75,114 '000':103 '0x8335':108 '20':102 '201':40 '2913':109 '300':130 '402':195 '6':118 'Base network API' 'USDC micropayment API' 'accept':89 'access':141,221 'actual':203 'advertis':98,140 'ai/ml':65 'analyt':64 'api':61,134,159,220 'application/json':226 'base':8,22,83,104,111 'base-network' 'behind':41,205 'beyond':216 'broader':50 'call':77 'challeng':97,200 'confirm':191 'connect':168 'content':174 'crypto payment endpoint' 'data':63,68 'decim':119 'descript':218 'doc':158 'document':150,183 'endpoint':6,20,30,87,189 'equal':113 'exact':126 'exampl':187 'extrem':155 'finance/web3':67 'function':204 'gate':3,17 'given':115 'grant':143 'header':149 'http':194 'id':39 'infer':66 'infrastructur':70 'json':94 'json-response' 'key':135 'limit':138 'live':192 'lowpaymentfee' 'lowpaymentfee.com':32 'made':122 'maxamountrequir':100 'mime':224 'network':84 'no-api-key' 'offer':53 'openapi':178 'page':163 'part':47 'pay':9,23,58 'pay-per-call API' 'pay-per-request':57 'payment':120,148 'paywal':44,207 'per':13,27,59,76 'platform':51 'post':90 'premium':219 'price':73,160 'prompt':170 'provid':33 'pure':144 'rate':137 'readm':162 'receipt':5,19,36 'render':165 'request':14,28,60,91 'request/response':181 'resourc':37 'respons':213 'return':93,193 'schema':182 'scheme':127 'second':131 'settl':78 'site':153 'span':62 'spars':156 'spec':179 'specif':86 'structur':210 'substant':173 'timeout':132 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'type':225 'unit':105 'unknown':215 'usag':186 'usdc':12,26,80,107,116 'usdc-settlement' 'util':71 'valid':198 'varieti':55 'via':123 'wallet':169 'x402':2,16,43,96,125,147,199 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"06a73ce2-adb6-4175-bf1e-14951dcee610","listingId":"3cc0e091-18f6-4e72-8deb-c1ec428fe514","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/201/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":"2026-04-18T18:59:02.431Z"}],"sources":[{"listingId":"3cc0e091-18f6-4e72-8deb-c1ec428fe514","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/201/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:02.431Z","lastSeenAt":"2026-04-24T20:03:14.270Z"}],"details":{"listingId":"3cc0e091-18f6-4e72-8deb-c1ec428fe514","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/201/receipt \\\n  -H \"X-PAYMENT: <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 HTTP 402 with x402 version 1 challenge advertising USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/201/receipt"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/201/receipt"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 201 via a single micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Agent-driven access to paid JSON endpoints without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Production workloads requiring documented request/response schemas","Users who need bulk or high-volume access with negotiated pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.377Z"},"updatedAt":"2026-04-24T20:03:14.270Z"}}