{"id":"9fa0efa0-0630-43f0-9c3c-863e62a10341","shortId":"fKEav6","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, priced at $0.02 in USDC.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, priced at $0.02 in USDC.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a \"Premium API Access\" receipt for transaction 302. It is part of a broader platform offering dozens of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, 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/302/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers attach an X-PAYMENT header containing a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The endpoint was confirmed live, returning a proper 402 challenge.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact purpose of a \"transaction 302 receipt\" is unclear; it may be a demo or placeholder endpoint. The platform advertises no API keys, no rate limits, and instant access, but these claims cannot be independently verified from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","transaction-receipt","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No OpenAPI or schema documentation available; /docs, /api, /pricing, /README all return only a wallet-connect prompt","The specific purpose and response format of /api/v1/transactions/302/receipt is undocumented","Claims of 'no rate limits' and 'no API keys' cannot be verified from available material","The endpoint path includes a hardcoded transaction ID (302), suggesting it may be a demo or placeholder"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/302/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/302/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 402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no request/response examples, and no explanation of what the receipt endpoint actually returns. The purpose of 'transaction 302' is unexplained. Score reflects a functional but poorly documented 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'/api/v1/transactions/302/receipt':92 '/docs':166 '/pricing':168 '/readme':170 '0.02':14,30,78,126 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':146 '20':121 '302':48,204 '402':155 '6':130 'Base network API' 'USDC micropayment API' 'accept':93 'access':44,227 'addit':181 'address':137 'advertis':218 'ai/ml':67 'analyt':66 'api':43,63,220 'attach':107 'avail':197 'base':9,25,87,123,140 'base-network' 'beyond':158 'broader':54 'call':4,20 'caller':106 'cannot':231 'challeng':156 'claim':230 'confirm':150 'connect':176 'contain':113 'contract':145 'crawl':237 'crypto payment endpoint' 'data':65,71 'decim':131 'demo':212 'detail':183 'document':157,192 'dozen':57 'enabl':36 'endpoint':7,23,37,91,148,215 'exact':199 'exampl':195 'extrem':163 'financ':69 'handl':101 'header':112 'i.e':125 'independ':233 'infer':68 'infrastructur':73 'instant':226 'json':98 'json-response' 'key':221 'land':160 'limit':224 'live':151 'lowpaymentfee' 'lowpaymentfee.com':39 'mainnet':141 'materi':238 'may':209 'network':88 'offer':56 'openapi':187 'page':161,171 'part':51 'pay':2,18,60 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':59 'payload':196 'payment':99,111,117,133 'per':3,19,61,79 'placehold':214 'platform':55,217 'post':94 'post-method' 'premium':42 'price':12,28,76 'prompt':178 'proper':154 'protocol':105 'provid':40 'purpos':200 'rate':223 'receipt':6,22,45,205 'render':173 'request':62,80,95 'request/response':190 'return':97,152 'schema':191 'sent':135 'settl':82 'sign':115 'sinc':127 'span':64 'spars':164 'spec':188 'specif':90 'technic':182 'transact':5,21,47,203 'transaction receipt API' 'transaction-receipt' 'unclear':207 'unit':124 'usdc':16,32,84,116,128,144 'usdc-settlement' 'use':129,142 'util':74 'verifi':234 'via':10,26,102 'wallet':177 'web3':70 'x':110 'x-payment':109 'x402':11,27,35,104 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"9caa7754-95cf-4e63-af76-d7e93bf5eaf6","listingId":"9fa0efa0-0630-43f0-9c3c-863e62a10341","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/302/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":"2026-04-18T19:25:54.955Z"}],"sources":[{"listingId":"9fa0efa0-0630-43f0-9c3c-863e62a10341","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/302/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:54.955Z","lastSeenAt":"2026-04-24T10:33:27.760Z"}],"details":{"listingId":"9fa0efa0-0630-43f0-9c3c-863e62a10341","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/302/receipt \\\n  -H \"X-PAYMENT: <x402-signed-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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/302/receipt"},{"claim":"The platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories all priced at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/transactions/302/receipt"}],"useCases":["Retrieving a transaction receipt via a single micropayment without API key registration","Demonstrating x402 protocol payment flows on Base mainnet","Integrating pay-per-use API calls into agent workflows that settle in USDC"],"bestFor":["Developers experimenting with x402 payment protocol integration","Agents needing keyless, pay-per-call API access on Base","Projects requiring USDC-settled micropayment endpoints"],"notFor":["Production workloads requiring documented request/response schemas","Use cases needing free or subscription-based API access","Applications requiring detailed transaction data beyond a receipt"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.378Z"},"updatedAt":"2026-04-24T10:33:27.760Z"}}