{"id":"c255817b-5c1f-475c-9dee-cc3e621c9f87","shortId":"eYuMMu","kind":"x402","title":"Pay-per-call arbitrage opportunities between Polymarket and Kalshi prediction markets.","tagline":"Pay-per-call arbitrage opportunities between Polymarket and Kalshi prediction markets.","description":"This x402-gated endpoint returns current arbitrage opportunities between Polymarket and Kalshi, two popular prediction markets. Each call costs up to 0.25 USDC on the Base network and delivers a snapshot of cross-platform pricing discrepancies that may represent profitable trades. The API uses both rule-based matching and LLM-based matching to identify overlapping markets across the two platforms.\n\nThe root API listing reveals several endpoints: GET /opportunities (HTML), GET /opportunities/json (JSON), a health check, and internal update/match triggers. The x402 challenge is configured on POST /opportunities, though the root listing advertises GET methods for the payment-gated data. The response MIME type is listed as text/html, suggesting the POST endpoint returns an HTML-formatted view of opportunities. For structured data, the /opportunities/json endpoint may be preferable, though its x402 configuration was not separately probed.\n\nImportant caveats from the provider: opportunities do not always exist and results may be empty. Data is informational only — users must verify all calculations independently, as markets move quickly. You are solely responsible for any trading actions taken based on this data.","tags":[],"capabilities":["prediction-market-arbitrage","polymarket-kalshi-cross-matching","x402-payment-gated","usdc-base-network","rule-based-matching","llm-based-matching","real-time-pricing"],"categories":["finance","prediction-markets","arbitrage"],"synonyms":["prediction market arbitrage","Polymarket Kalshi arbitrage","cross-platform arbitrage","event contract arbitrage","prediction market scanner","arb finder","market discrepancy detector"],"warnings":["No output schema provided — response format is unknown beyond mimeType text/html","No formal API documentation exists (docs, api, pricing, README all return 404)","The x402 challenge is on POST /opportunities but the root listing advertises GET /opportunities — method mismatch is unclear","Results may be empty; no guarantee of actionable data on any given call","Financial data disclaimer: verify all calculations independently; markets move quickly","Response mimeType is text/html, not JSON — agents may need to parse HTML or use /opportunities/json instead"],"endpointUrl":"https://arb.axryl.com/opportunities","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xb1e82E1f0d3a736Fe662269Adc10FBe460fE1Bf9","scheme":"exact","network":"base","mimeType":"text/html","resource":"https://arb.axryl.com/opportunities","description":"Access to arbitrage opportunities between Polymarket and Kalshi. Pricing valid at time of call.\nBy proceeding you acknowledge opportunities do not always exist and results may be empty. Data provided for informational purposes only; verify all calculations yourself, markets move quickly. You are solely responsible for any actions you choose to take.","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true},"output":null},"maxAmountRequired":"250000","maxTimeoutSeconds":300}]},"qualityScore":"0.450","qualityRationale":"The endpoint is live with a valid 402 challenge and clear pricing (0.25 USDC on Base). However, there is no OpenAPI spec, no documentation beyond the root JSON listing, no output schema, and no example responses. The response MIME type is text/html which is unusual for an API. Several details must be 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'/opportunities/json':100,154 '0.25':47 'Polymarket Kalshi arbitrage' 'across':85 'action':203 'advertis':121 'alway':175 'api':69,91 'arb finder' 'arbitrag':5,17,32 'base':51,74,79,205 'calcul':190 'call':4,16,43 'caveat':168 'challeng':111 'check':104 'configur':113,162 'cost':44 'cross':59 'cross-platform':58 'cross-platform arbitrage' 'current':31 'data':129,152,182,208 'deliv':54 'discrep':62 'empti':181 'endpoint':29,95,141,155 'event contract arbitrage' 'exist':176 'format':146 'gate':28,128 'get':96,99,122 'health':103 'html':98,145 'html-format':144 'identifi':82 'import':167 'independ':191 'inform':184 'intern':106 'json':101 'kalshi':10,22,37 'list':92,120,135 'llm':78 'llm-base':77 'llm-based-matching' 'market':12,24,41,84,193 'market discrepancy detector' 'match':75,80 'may':64,156,179 'method':123 'mime':132 'move':194 'must':187 'network':52 'opportun':6,18,33,149,172 'overlap':83 'pay':2,14 'pay-per-cal':1,13 'payment':127 'payment-g':126 'per':3,15 'platform':60,88 'polymarket':8,20,35 'polymarket-kalshi-cross-matching' 'popular':39 'post':115,140 'predict':11,23,40 'prediction market arbitrage' 'prediction market scanner' 'prediction-market-arbitrage' 'prefer':158 'price':61 'probe':166 'profit':66 'provid':171 'quick':195 'real-time-pricing' 'repres':65 'respons':131,199 'result':178 'return':30,142 'reveal':93 'root':90,119 'rule':73 'rule-bas':72 'rule-based-matching' 'separ':165 'sever':94 'snapshot':56 'sole':198 'structur':151 'suggest':138 'taken':204 'text/html':137 'though':117,159 'trade':67,202 'trigger':108 'two':38,87 'type':133 'update/match':107 'usdc':48 'usdc-base-network' 'use':70 'user':186 'verifi':188 'view':147 'x402':27,110,161 'x402-gated':26 'x402-payment-gated'","prices":[{"id":"f2f26bcb-3411-4f07-a598-b6cf46f3fe54","listingId":"c255817b-5c1f-475c-9dee-cc3e621c9f87","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"250000","chain":"base","payTo":"0xb1e82E1f0d3a736Fe662269Adc10FBe460fE1Bf9","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"text/html","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xb1e82E1f0d3a736Fe662269Adc10FBe460fE1Bf9","scheme":"exact","network":"base","mimeType":"text/html","resource":"https://arb.axryl.com/opportunities","description":"Access to arbitrage opportunities between Polymarket and Kalshi. Pricing valid at time of call.\nBy proceeding you acknowledge opportunities do not always exist and results may be empty. Data provided for informational purposes only; verify all calculations yourself, markets move quickly. You are solely responsible for any actions you choose to take.","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true},"output":null},"maxAmountRequired":"250000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:33.383Z"}],"sources":[{"listingId":"c255817b-5c1f-475c-9dee-cc3e621c9f87","source":"x402_bazaar","sourceId":"https://arb.axryl.com/opportunities","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:33.383Z","lastSeenAt":"2026-05-02T18:34:05.568Z"}],"details":{"listingId":"c255817b-5c1f-475c-9dee-cc3e621c9f87","quickStartSnippet":"curl -X POST https://arb.axryl.com/opportunities \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true},"output":null},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The root API lists endpoints including GET /opportunities, GET /opportunities/json, GET /health, POST /update/all, and POST /match/llm","source_url":"https://arb.axryl.com"},{"claim":"The x402 challenge requires up to 250000 units (0.25 USDC) on the Base network, paid to 0xb1e82E1f0d3a736Fe662269Adc10FBe460fE1Bf9","source_url":"https://arb.axryl.com/opportunities"},{"claim":"The provider disclaims that opportunities do not always exist and results may be empty, and data is for informational purposes only","source_url":"https://arb.axryl.com/opportunities"}],"useCases":["Identify mispriced contracts across Polymarket and Kalshi for potential arbitrage trades","Monitor prediction market spreads programmatically via agent-initiated paid API calls","Build automated trading strategies that consume real-time cross-platform opportunity data","Research prediction market efficiency by analyzing pricing discrepancies"],"bestFor":["Prediction market traders looking for cross-platform arbitrage","Automated trading agents that can pay per call with USDC on Base","Researchers studying prediction market pricing efficiency"],"notFor":["Users needing historical arbitrage data or backtesting datasets (only current snapshot provided)","Anyone expecting guaranteed profitable opportunities (results may be empty)","Users who cannot transact with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:06.882Z"},"updatedAt":"2026-05-02T18:34:05.568Z"}}