{"id":"ac34bd11-705d-4422-8015-bf04cca340dc","shortId":"JqQhJ4","kind":"x402","title":"Pay-per-call blockchain transaction explainer behind an x402 paywall.","tagline":"Pay-per-call blockchain transaction explainer behind an x402 paywall.","description":"This endpoint at tools-agent-x402-production.up.railway.app/tx-explainer appears to provide blockchain transaction explanation functionality, gated behind the x402 payment protocol. The endpoint is live and responds with HTTP 402 (Payment Required) on POST requests, which is the standard x402 challenge behavior indicating the service is operational and awaiting payment.\n\nHowever, the probe returned an empty x402 challenge object (no pricing details, no accepted tokens, no network information), and the crawl of the provider's origin yielded no documentation, no OpenAPI spec, no README, and no additional routes. The service is hosted on Railway and the URL path \"tx-explainer\" strongly suggests it accepts a blockchain transaction hash or raw transaction data and returns a human-readable or structured explanation of what the transaction does.\n\nDue to the complete absence of documentation, schema, pricing details, and examples, this listing is largely inferred from the endpoint name alone. The x402 protocol is confirmed live, but without the challenge payload details (accepted currency, amount, network), it is impossible to determine the cost per call or how to actually complete a payment and use the service.","tags":[],"capabilities":["transaction-explanation","x402-paywall","blockchain-analysis","pay-per-call"],"categories":["crypto","blockchain"],"synonyms":["tx explainer","transaction decoder","transaction interpreter","blockchain tx analysis","transaction summary","tx decoder"],"warnings":["x402 challenge object is empty — no pricing, accepted tokens, or network details available","No documentation, OpenAPI spec, or README found at the provider origin","Request and response schemas are entirely inferred from the endpoint name","Cannot determine actual cost per call without a populated x402 challenge","Root origin returns 404; no discoverable routes besides the endpoint itself"],"endpointUrl":"https://tools-agent-x402-production.up.railway.app/tx-explainer","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808","amount":"10000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"},"payTo":"6XcSfqJHr9vNW2vbiRaMqUYVm7shDgLepca54wUTDPN5","amount":"10000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300}]},"qualityScore":"0.150","qualityRationale":"The endpoint is live (402 on POST), confirming x402 protocol presence, but the challenge object is empty with no pricing, token, or network info. No documentation, no schema, no examples exist anywhere on the origin. Nearly everything is inferred from the URL path name 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'402':50 'absenc':152 'accept':84,125,182 'actual':198 'addit':107 'alon':169 'amount':184 'appear':29 'await':69 'behavior':62 'behind':8,19,37 'blockchain':5,16,32,127 'blockchain tx analysis' 'blockchain-analysis' 'call':4,15,194 'challeng':61,78,179 'complet':151,199 'confirm':174 'cost':192 'crawl':91 'currenc':183 'data':133 'detail':82,157,181 'determin':190 'document':99,154 'due':148 'empti':76 'endpoint':24,43,167 'exampl':159 'explain':7,18,121 'explan':34,142 'function':35 'gate':36 'hash':129 'host':112 'howev':71 'http':49 'human':138 'human-read':137 'imposs':188 'indic':63 'infer':164 'inform':88 'larg':163 'list':161 'live':45,175 'name':168 'network':87,185 'object':79 'openapi':101 'oper':67 'origin':96 'path':118 'pay':2,13 'pay-per-cal':1,12 'pay-per-call' 'payload':180 'payment':40,51,70,201 'paywal':11,22 'per':3,14,193 'post':54 'price':81,156 'probe':73 'protocol':41,172 'provid':31,94 'railway':114 'raw':131 'readabl':139 'readm':104 'request':55 'requir':52 'respond':47 'return':74,135 'rout':108 'schema':155 'servic':65,110,205 'spec':102 'standard':59 'strong':122 'structur':141 'suggest':123 'token':85 'tools-agent-x402-production.up.railway.app':27 'tools-agent-x402-production.up.railway.app/tx-explainer':26 'transact':6,17,33,128,132,146 'transaction decoder' 'transaction interpreter' 'transaction summary' 'transaction-explanation' 'tx':120 'tx decoder' 'tx explainer' 'tx-explain':119 'url':117 'use':203 'without':177 'x402':10,21,39,60,77,171 'x402-paywall' 'yield':97","prices":[{"id":"7f5fe104-f857-4a38-9af9-2f8cfb6e2bf7","listingId":"ac34bd11-705d-4422-8015-bf04cca340dc","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808","amount":"10000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"},"payTo":"6XcSfqJHr9vNW2vbiRaMqUYVm7shDgLepca54wUTDPN5","amount":"10000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:33.452Z"}],"sources":[{"listingId":"ac34bd11-705d-4422-8015-bf04cca340dc","source":"x402_bazaar","sourceId":"https://tools-agent-x402-production.up.railway.app/tx-explainer","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.452Z","lastSeenAt":"2026-04-22T04:02:48.326Z"}],"details":{"listingId":"ac34bd11-705d-4422-8015-bf04cca340dc","quickStartSnippet":"curl -X POST https://tools-agent-x402-production.up.railway.app/tx-explainer \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"txHash\": \"0xabc123...\"}'","exampleRequest":{"txHash":"0xabc123def456789..."},"exampleResponse":null,"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 on POST, confirming x402 protocol is live","source_url":"https://tools-agent-x402-production.up.railway.app/tx-explainer"},{"claim":"No documentation or additional routes found at the provider origin","source_url":"https://tools-agent-x402-production.up.railway.app"}],"useCases":["Explaining what a blockchain transaction does in human-readable terms","Decoding complex smart contract interactions for end users","Providing transaction summaries for wallet or explorer integrations"],"bestFor":["Agents needing on-demand transaction explanations","Wallet apps that want to show users what a transaction will do","Developers building blockchain explorers or dashboards"],"notFor":["Users needing free or high-volume transaction analysis (pay-per-call model)","Use cases requiring detailed documentation or SLA guarantees"],"kindDetails":{},"updatedAt":"2026-04-22T00:53:11.693Z"}}