{"id":"0a2b74d0-5880-4965-9eb3-bc87d92694b3","shortId":"BhVDAR","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 access to a transaction receipt resource at `/api/v1/transactions/252/receipt`. It is part of a broader platform offering multiple API categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments 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 (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. Payment is made via the x402 exact scheme to the specified payTo address. The platform advertises a uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation 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 schema, no request/response examples, and no detailed description of what the transaction receipt endpoint actually returns. The endpoint accepts POST requests and returns application/json, but the exact payload structure is unknown. The platform appears to be a demonstration or early-stage x402 API marketplace.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","transaction-receipt","json-response","no-api-key","micropayment"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment API","Base USDC API","pay-per-request API","lowpaymentfee","crypto payment endpoint","402 payment required"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or output schema describing the response format","The specific resource path (/transactions/252/receipt) suggests a fixed resource rather than a parameterized endpoint; unclear if other transaction IDs are supported","Platform may be a demo or early-stage project"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/252/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/252/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, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the receipt endpoint actually returns. The listing is effectively a 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'/api/v1/transactions/252/receipt':48 '/docs':152 '/pricing':154 '/readme':156 '/request':130 '0.02':14,30,108,129 '000':95 '0x8335':100 '20':94 '2913':101 '402':87 '402 payment required' '6':104 'Base USDC API' 'accept':191 'access':41 'across':132 'actual':187 'address':123 'advertis':126 'ai':62 'analyt':61 'api':58,137,216 'appear':206 'application/json':196 'base':9,25,77,96,103 'behind':72 'broader':54 'call':4,20 'categori':59 'challeng':88 'commit':145 'connect':162 'content':168 'crypto payment endpoint' 'data':60 'decim':105 'demonstr':210 'descript':180 'detail':179 'document':147 'earli':213 'early-stag':212 'enabl':36 'endpoint':7,23,37,83,134,186,190 'equal':107 'exact':117,199 'exampl':176 'extrem':149 'financ':65 'gate':71 'infrastructur':68 'json-response' 'key':138 'learn':64 'limit':141 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':63 'made':113 'marketplac':217 'micropay':74 'micropayment' 'minimum':144 'multipl':57 'network':78 'no-api-key' 'offer':56 'openapi':172 'page':157 'part':51 'pay':2,18 'pay-per-cal':1,17 'pay-per-call' 'pay-per-request API' 'payload':200 'payment':90,111 'payto':122 'per':3,19,109 'platform':55,125,205 'post':192 'price':12,28,131 'probe':84 'prompt':164 'provid':40 'rate':140 'receipt':6,22,45,185 'render':159 'request':89,110,193 'request/response':175 'requir':146 'resourc':46 'return':85,188,195 'schema':173 'scheme':118 'spars':150 'specif':82 'specifi':121 'stage':214 'structur':201 'substant':167 'transact':5,21,44,184 'transaction receipt API' 'transaction-receipt' 'uniform':128 'unit':97 'unknown':203 'usdc':16,32,80,99 'usdc-base' 'use':79 'util':69 'via':10,26,114 'wallet':163 'web3':66 'x402':11,27,35,73,116,215 'x402 micropayment API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"4dcc4608-ac30-4566-abc2-0caa546debc1","listingId":"0a2b74d0-5880-4965-9eb3-bc87d92694b3","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/252/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":"2026-04-18T18:59:48.866Z"}],"sources":[{"listingId":"0a2b74d0-5880-4965-9eb3-bc87d92694b3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/252/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:48.866Z","lastSeenAt":"2026-04-24T13:03:15.478Z"}],"details":{"listingId":"0a2b74d0-5880-4965-9eb3-bc87d92694b3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/252/receipt \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/252/receipt"},{"claim":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/252/receipt"}],"useCases":["Retrieving transaction receipt data via a single micropayment","Testing x402 payment flows on the Base network","Integrating pay-per-call APIs without API key management"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need keyless, pay-per-call API access on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Production workloads requiring documented request/response schemas","Users needing bulk or high-throughput data retrieval with predictable SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.228Z"},"updatedAt":"2026-04-24T13:03:15.478Z"}}