{"id":"27e6bca5-c45b-4556-b2d2-15f8ba058ac8","shortId":"e2Xvqm","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 309) 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/309/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the accepted payment scheme (exact), the USDC asset contract on Base (`0x8335…`), and a maximum amount of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per call — consistent with the site's advertised flat pricing. No API keys or rate limits are required; access is granted immediately upon payment.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The endpoint is live (402 challenge confirmed), but the actual data returned after payment is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","per-call-pricing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet' with no content","No OpenAPI or schema definition for request or response payloads","The endpoint is for a single hardcoded transaction ID (309); unclear if other transaction IDs are available","Actual response content after payment is unknown from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/309/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/309/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, but there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty stubs. The actual content returned after payment is completely 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'0.02':71,134 '000':123 '0x8335':116 '20':122 '309':40 '402':102,201 '6':129 'Base network API' 'USDC micropayment endpoint' 'accept':86,106 'access':153 'actual':206 'advertis':53,142 'ai':60 'amount':120 'analyt':59 'api':55,146,168 'application/json':91 'asset':112 'avail':215 'base':8,22,80,115,124 'base-network' 'behind':41 'broader':50 'call':12,26,136 'caller':99 'categori':56 'challeng':103,202 'confirm':203 'connect':177 'consist':137 'contain':104 'content':183 'contract':113 'crypto payment API' 'data':58,207 'decim':130 'doc':167 'document':159,192 'endpoint':6,20,30,84,198 'exact':109 'exampl':196 'extrem':164 'financ':63 'flat':143 'gate':3,17 'grant':155 'handl':94 'id':39 'immedi':156 'includ':57 'infrastructur':66 'json-response' 'key':147 'learn':62 'limit':150 'live':200 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'materi':216 'maximum':119 'multipl':54 'network':81 'no-api-key' 'openapi':187 'page':172 'paid':9,23 'part':47 'pay-per-call API' 'payment':92,107,158,210 'paywal':44 'per':11,25,72,135 'per-cal':10,24 'per-call-pricing' 'platform':51 'post':87 'price':69,144,169 'prompt':179 'protocol':98 'provid':33 'rate':149 'readm':171 'receipt':5,19,36 'receiv':100 'render':174 'request':73,88 'request/response':190 'requir':152 'resourc':37 'return':90,208 'schema':191 'scheme':108 'settl':75 'sinc':126 'site':140,162 'spec':188 'specif':83 'thin':165 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'translat':132 'unit':125 'unknown':212 'upon':157 'usag':195 'usdc':14,28,77,111,127 'usdc-settlement' 'use':128 'util':67 'via':95 'wallet':178 'web3':64 'x402':2,16,43,97 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"61b94225-9e40-4f70-82d5-9e3fd9c1912f","listingId":"27e6bca5-c45b-4556-b2d2-15f8ba058ac8","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/309/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":"2026-04-18T19:26:02.882Z"}],"sources":[{"listingId":"27e6bca5-c45b-4556-b2d2-15f8ba058ac8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/309/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:02.882Z","lastSeenAt":"2026-04-24T10:33:28.065Z"}],"details":{"listingId":"27e6bca5-c45b-4556-b2d2-15f8ba058ac8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/309/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment to access.","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/309/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 Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/309/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 309 via a single micropayment","Demonstrating x402 protocol integration for pay-per-call APIs","Agent-driven programmatic access to paid receipt data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base","Use cases needing keyless, pay-per-request API access"],"notFor":["Users who need detailed API documentation or response schemas before purchasing","Bulk retrieval of many different transaction receipts (only transaction 309 is exposed at this endpoint)","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.068Z"},"updatedAt":"2026-04-24T10:33:28.065Z"}}