{"slug":"pm-fee-comparison","title":"Prediction market fees, Polymarket vs Kalshi and more","subtitle":"Maker and taker fees, protocol cuts and net cost to trade across five prediction market venues, sourced from official fee schedules and verified from fills data.","category":"Trading","metric":"Effective taker fee","unit":"pct","status":"live","higherIsBetter":false,"filters":null,"value":2,"leader":{"name":"Polymarket","slug":"polymarket","value":2},"rankings":[{"name":"Polymarket","slug":"polymarket","ms":{"p50":2,"p90":2,"p99":2,"mean":2},"successRate":100,"sampleSize":1},{"name":"Myriad","slug":"myriad","ms":{"p50":2,"p90":2,"p99":2,"mean":2},"successRate":100,"sampleSize":1},{"name":"Limitless","slug":"limitless","ms":{"p50":2.65,"p90":2.65,"p99":2.65,"mean":2.65},"successRate":100,"sampleSize":1},{"name":"Kalshi","slug":"kalshi","ms":{"p50":7,"p90":7,"p99":7,"mean":7},"successRate":100,"sampleSize":1}],"sparkline":[2,2,2,2,2],"sampleSize":5,"asOf":"2026-07-29T01:10:08.649Z","headline":"Polymarket leads effective taker fee at 2.00% (24h avg) on Prediction market fees, Polymarket vs Kalshi and more.","quote":"Polymarket leads effective taker fee at 2.00% (24h avg) on Prediction market fees, Polymarket vs Kalshi and more. Source: OpenChainBench (https://openchainbench.com/benchmarks/pm-fee-comparison).","cite":{"plain":"OpenChainBench. \"Prediction market fees, Polymarket vs Kalshi and more\". Retrieved 2026-07-29. https://openchainbench.com/benchmarks/pm-fee-comparison","bibtex":"@misc{ocb_pm_fee_comparison,\n  author = {OpenChainBench},\n  title  = {Prediction market fees, Polymarket vs Kalshi and more},\n  year   = {2026},\n  url    = {https://openchainbench.com/benchmarks/pm-fee-comparison},\n  note   = {Retrieved 2026-07-29}\n}","apa":"OpenChainBench. (2026). Prediction market fees, Polymarket vs Kalshi and more. Retrieved July 29, 2026, from https://openchainbench.com/benchmarks/pm-fee-comparison","ris":"TY  - GEN\r\nAU  - OpenChainBench\r\nTI  - Prediction market fees, Polymarket vs Kalshi and more\r\nPY  - 2026\r\nUR  - https://openchainbench.com/benchmarks/pm-fee-comparison\r\nY2  - 2026-07-29\r\nER  - \r\n"},"pageUrl":"https://openchainbench.com/benchmarks/pm-fee-comparison","ogImage":"https://openchainbench.com/api/og/pm-fee-comparison","source":"https://github.com/ChainBench/OpenChainBench/tree/main/harnesses/pm-fee-comparison","methodology":["Fee normalization: all fees are expressed as basis points of gross notional (contract price times contract count times $1 resolution value) at three price points: $0.50 (at-the-money), $0.05/$0.95 (near-certainty), and $0.30/$0.70 (mid-skewed). This converts Kalshi's per-contract dollar fee and Polymarket's payout-percentage fee to a common unit.","Polymarket fee measurement: the 2% fee is deducted from potential payout. A YES share bought at $0.50 pays $0.98 on resolution, not $1.00. Effective fee in basis points = 200 at all price points because the fee percentage is flat. No maker rebate exists on the public CLOB.","Kalshi fee measurement: Kalshi publishes a tiered per-contract fee schedule. Fees are capped at low and high price extremes. The harness reads the published schedule and computes the fee at each price point as fee/contract_price in basis points. Near-certainty markets benefit most from the cap.","Limitless and Myriad fee measurement: CLOB spread is used as a proxy for effective fee where explicit fee schedules are not published. The half-spread on the pinned market at each price tier is recorded as the effective round-trip cost.","Manifold is play-money and carries no real-money fee. It is included in the cohort for completeness but its fee row reads zero and it is excluded from the real-money fee rankings.","Data cadence: fee schedules are polled once per hour. Per-contract fees on Kalshi are re-read whenever the published schedule changes (detected via hash of the fee schedule endpoint). Effective fee rows on the leaderboard update within 1 hour of any venue publishing a fee change."],"license":"CC-BY-4.0"}