{"id":"4f275f87-c6d1-4503-8361-236a4e909533","shortId":"TgFW4h","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a \"Premium API Access\" receipt for transaction ID 306. It is part of a broader platform offering dozens of pay-per-call API endpoints 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/306/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 at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. No API keys or rate limits are advertised; access is gated purely by payment.\n\nDocumentation is extremely sparse — the docs, pricing, and API 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 endpoint is confirmed live (returns a proper 402 challenge), but the actual response format and the meaning of \"transaction 306 receipt\" are not documented anywhere in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","json-response","no-api-key","transaction-receipt"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment endpoint"],"warnings":["No documentation available beyond the landing page listing — docs, pricing, and API pages render only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The specific meaning of 'transactions/306/receipt' is undocumented; it is unclear what data this endpoint returns","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/306/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/306/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 402 challenge, but documentation is essentially nonexistent — docs/pricing/API pages all show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of 'transaction 306 receipt' is unexplained. The listing is effectively a 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'/request':17,34 '0.02':16,33,81,129 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':150 '20':124 '306':51,221 '402':209 '6':133 'Base network API' 'USDC micropayment API' 'accept':96 'access':46,159 'actual':213 'addit':184 'address':140 'advertis':158 'ai/ml':71 'analyt':70 'anywher':226 'api':45,66,152,173 'attach':110 'avail':200 'base':9,26,90,126,143 'base-network' 'broader':57 'call':4,21,65 'caller':109 'challeng':210 'confirm':204 'connect':179 'contain':116 'contract':148 'crawl':229 'crypto payment endpoint' 'data':69,74 'decim':134 'detail':186 'doc':170 'document':165,195,225 'dozen':60 'enabl':38 'endpoint':7,24,39,67,94,202 'exampl':198 'extrem':167 'finance/web3':73 'format':215 'gate':161 'handl':104 'header':115 'i.e':128 'id':50 'infer':72 'infrastructur':76 'json':101 'json-response' 'key':153 'limit':156 'live':205 'lowpaymentfee' 'lowpaymentfee.com':41 'mainnet':144 'materi':230 'mean':218 'network':91 'no-api-key' 'offer':59 'openapi':190 'page':174 'part':54 'pay':2,19,63 'pay-per-cal':1,18,62 'pay-per-call' 'pay-per-request API' 'payload':199 'payment':102,114,120,136,164 'per':3,20,64,82 'platform':58 'post':97 'premium':44 'price':79,171 'prompt':181 'proper':208 'protocol':108 'provid':42 'pure':162 'rate':155 'receipt':6,23,47,222 'render':176 'request':83,98 'request/response':193 'respons':214 'return':100,206 'schema':194 'sent':138 'settl':12,29,85 'sign':118 'sinc':130 'span':68 'spars':168 'spec':191 'specif':93 'technic':185 'transact':5,22,49,220 'transaction receipt API' 'transaction-receipt' 'unit':127 'usdc':14,31,87,119,131,147 'usdc-settlement' 'use':132,145 'util':77 'via':10,27,105 'wallet':180 'x':113 'x-payment':112 'x402':11,28,37,107 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"8e7435cb-6d3b-4ea5-9f49-52c46cdc5002","listingId":"4f275f87-c6d1-4503-8361-236a4e909533","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/306/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":"2026-04-18T19:25:59.216Z"}],"sources":[{"listingId":"4f275f87-c6d1-4503-8361-236a4e909533","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/306/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:59.216Z","lastSeenAt":"2026-04-24T10:33:27.911Z"}],"details":{"listingId":"4f275f87-c6d1-4503-8361-236a4e909533","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/306/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":"Endpoint returns 402 with x402 challenge advertising USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/306/receipt"},{"claim":"Platform advertises $0.02 per request across all endpoints with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/306/receipt"},{"claim":"Docs, pricing, and API pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 306 via a single paid API call","Demonstrating x402 protocol payment flows on Base with USDC","Integrating pay-per-call APIs into agent workflows without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Projects requiring USDC-settled micropayment endpoints"],"notFor":["Production use cases requiring documented request/response schemas","Bulk or high-volume data retrieval (no batch endpoints documented)","Users who need fiat or non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.206Z"},"updatedAt":"2026-04-24T10:33:27.911Z"}}