{"id":"c74ddbd8-a38a-4331-9a72-ee816d1d27b1","shortId":"tcYh2g","kind":"x402","title":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","tagline":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource at `/api/v1/transactions/251/receipt`. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network using USDC.\n\nThe specific endpoint probed returns a 402 challenge requesting payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is made via the x402 \"exact\" scheme to the specified wallet address. The platform advertises a flat $0.02 per request 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 examples of what the receipt endpoint actually returns. The endpoint path suggests it retrieves a receipt for a specific transaction (ID 251), but the exact request body format and response structure are unknown. The platform appears to be a demonstration or early-stage deployment of x402-gated APIs.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","transaction-receipt","pay-per-use"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request body and response format are entirely unknown.","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content.","The specific endpoint path (/api/v1/transactions/251/receipt) appears to be for a single hardcoded transaction ID; unclear if this is a general-purpose endpoint.","Platform appears to be early-stage or a demo deployment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/251/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/251/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 there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty stubs. The purpose and output of this specific receipt endpoint are unclear beyond what can be inferred from the URL 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'/api/v1/transactions/251/receipt':37 '/docs':147 '/pricing':148 '/readme':151 '0.02':97,124 '000':92 '20':91 '251':196 '402':84 '6':102 'Base network API' 'USDC micropayment API' 'across':127 'actual':181 'address':118 'advertis':121 'ai/ml':58 'analyt':57 'api':53,132,224 'appear':210 'base':5,18,74,93 'base-network' 'bodi':201 'broader':43 'call':9,22,52,105 'challeng':85 'commit':140 'connect':157 'content':163 'data':56,61 'decim':103 'demonstr':214 'deploy':219 'document':142,172 'dozen':47 'earli':217 'early-stag':216 'endpoint':3,16,28,54,80,129,180,184 'exact':112,199 'exampl':175 'extrem':144 'finance/web3':60 'flat':123 'format':202 'gate':66,223 'id':195 'infer':59 'infrastructur':63 'key':133 'limit':136 'lowpaymentfee' 'lowpaymentfee.com':30 'made':108 'minimum':139 'network':75 'offer':46 'openapi':167 'page':152 'paid':6,19 'part':40 'path':185 'pay':50 'pay-per-cal':49 'pay-per-call API' 'pay-per-use' 'payment':70,87,106 'per':8,21,51,104,125 'per-cal':7,20 'per-call-pricing' 'platform':44,120,209 'probe':81 'prompt':159 'protocol':71 'provid':31 'rate':135 'receipt':2,15,34,179,190 'render':154 'request':86,126,200 'request/response':170 'requir':141 'resourc':35 'respons':204 'retriev':188 'return':82,182 'schema':171 'scheme':113 'sinc':99 'span':55 'spars':145 'spec':168 'specif':79,193 'specifi':116 'stage':218 'structur':205 'substant':162 'suggest':186 'transact':1,14,33,194 'transaction receipt API' 'transaction-receipt' 'unit':94 'unknown':207 'usd':98 'usdc':13,26,77,96,100 'usdc-settlement' 'use':76,101 'util':64 'via':10,23,67,109 'wallet':117,158 'x402':11,24,69,111,222 'x402 paid endpoint' 'x402-gated':221 'x402-payment'","prices":[{"id":"177f499f-271f-49b8-b7c4-737a7e0c5fcd","listingId":"c74ddbd8-a38a-4331-9a72-ee816d1d27b1","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/251/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":"2026-04-18T18:59:37.216Z"}],"sources":[{"listingId":"c74ddbd8-a38a-4331-9a72-ee816d1d27b1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/251/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:37.216Z","lastSeenAt":"2026-04-24T15:03:06.475Z"}],"details":{"listingId":"c74ddbd8-a38a-4331-9a72-ee816d1d27b1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/251/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment to proceed.","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/251/receipt"},{"claim":"The platform advertises $0.02 per request across all endpoints with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/transactions/251/receipt"}],"useCases":["Retrieving a transaction receipt for a specific transaction ID via micropayment","Demonstrating x402 protocol payment flows on Base with USDC","Agent-driven per-call API access without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Testing micropayment-gated endpoint integrations"],"notFor":["Production workloads requiring documented request/response schemas","Bulk transaction receipt retrieval at scale (no batch endpoint documented)","Users who need fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.71Z"},"updatedAt":"2026-04-24T15:03:06.475Z"}}