Data infrastructureLiveData & Developer Tools

Simmer

Connect AI agents to Polymarket and Kalshi through one API.

Polymarket support
Full Polymarket support
Pricing model
Freemium · from $19/month
Access requirement
Wallet required
Wallet required
Yes
Trade execution
Automated
Last editorial review
Sep 23, 2026

01 · Overview

What is Simmer?

Simmer gives agents a persistent identity, self-custody wallet and cross-venue track record. Agents can paper trade with virtual $SIM, then use real USDC.e on Polymarket or route Kalshi trading through DFlow on Solana. The Python SDK, MCP and skills ecosystem include local signing plus configurable per-trade limits, daily caps, stop-loss, take-profit and a kill switch.

APIAutomationMCPSDKTrade Execution

02 · Best for

Who is Simmer best for?

Best for

Developers building supervised prediction-market agents that need paper-to-live workflows, local signing, and explicit trade, loss, stop, and kill-switch controls.

Not ideal for

Nontechnical users or teams unwilling to operate keys, API credentials, and automated risk controls.

Limitations

Simmer is in alpha. Self-custody does not eliminate model, code, venue, oracle or loss risk; live workflows require careful limits, key security, monitoring and human oversight. Kalshi access through DFlow has separate wallet and identity requirements.

03 · Access & execution

How do access and execution work?

Entity typeData infrastructure
Polymarket supportFull Polymarket support
Pricing modelFreemium · from $19/month
Free planYes
Access requirementWallet required
Wallet requiredYes
Trade executionAutomated
Product statusLive
KalshiPolymarket

Scope-aware product facts

What to look for

Surfaces

ProductWeb · Supported Evidence

Access modes

Primary workflowWallet required · wallet Yes · User-signed · Non-custodial Evidence

Execution modes

Primary workflowAutomated · Supported · User-signed Evidence

Pricing offers

Primary productFree plan · $0 Evidence
Paid tierSubscription · $19 Evidence

Data capabilities

Product data · P&LUnknown · Unknown Evidence
Product data · Fee accountingUnknown · Fees included in P&L Evidence
Product data · Rewards accountingUnknown · Rewards included in P&L Evidence
Product data · Open positions accountingSupported · Open positions included in P&L Evidence
Market data · Order book historyNot applicable · Not applicable Evidence

04 · Data provenance

Data provenance

Current coverage: PartialA transparent record of which official sources were checked and when.

Data originVenue API
PnL methodologyUnknown
Fees includedUnknown
Rewards includedUnknown
Open positions includedYes
Order-book historyNot applicable
Update cadenceReal time
Review provenance evidence

05 · Public footprint

Public footprint

Current public signals from official platform sources, shown with their observation dates.

Product activity

A transparent record of which official sources were checked and when.

Product statusLive
Tracked by PredAtlas sinceAug 24, 2026
Last editorial reviewSep 23, 2026
Official documentationYes

06 · Sources & review

How was Simmer reviewed?

Documentation strength: PartialA transparent record of which official sources were checked and when.

Review pending · Sep 23, 2026

Official product sources were checked for documented identity, scope, access, pricing and limitations. This is not a security audit, performance test or endorsement.