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Polymarket — Prediction Market Data · graniet | DecimalAI

financeby graniet

Polymarket — Prediction Market Data

graniet/polymarket

Source graniet/kheish ↗License Apache-2.0

Query Polymarket prediction market data — search markets, get prices, orderbooks, and price history. Read-only via public REST APIs, no API key needed.

SkillScore82Maintained

Automatic

Finance & Accounting pack

Last verified 8/23/2026

What it changes

Passed 15 of 18 test cases with the skill, and 9 of 18 without it.

Without skill50%

With skill82%

Checks it passed that the model alone missed

The response states that volume amounts are denominated in USDC.
The response states that read-only API requests require zero authentication.
The response identifies conditionId as the key used for historical price queries.

and 7 more in the full report

9 fixed9 passed either way2 still failing2 broke

Pass-rate lift: +32 pp
Tokens: -15%
Agent turns: 0%
Response time: -65%

Model gemini-3.6-flashMeasured 8/23/2026v118 of 22 cases passed with skill · 18 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/graniet-polymarket/SKILL.md https://app.decimal.ai/s/graniet-polymarket/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add graniet-polymarket, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/graniet-polymarket/ and pins it in .decimal/skills.lock

decimalai skills add graniet-polymarket

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/graniet-polymarket/SKILL.md https://app.decimal.ai/s/graniet-polymarket/SKILL.md

Raw file: /s/graniet-polymarket/SKILL.md ↗ · machine-readable summary at /s/graniet-polymarket.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 9 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 9

Prompt

What request volume per 10 seconds is permitted on data-api.polymarket.com when fetching open interest metrics?

What was checked, without and with the skill
Checked	Without skill	With skill
The response specifies a rate limit threshold of 1,000 requests per 10 seconds for the Data API.	Missed	Passed

case-19 · gemini-3.6-flash · 8/23/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md81 lines3 filesincludes scripts

Kheish Compatibility

This skill is repo-local and stays inactive until explicitly activated.

When the original instructions refer to legacy tool names, use these Kheish mappings:

terminal => bash
web_extract => web_fetch, plus web_search when discovery is needed
search_files => grep_search and glob_search
browser_* tools require a browser-capable surfaced tool or MCP; if none is available, use the closest available surface and say so explicitly

When the instructions mention local helper files, resolve them from ${KHEISH_SKILL_DIR}.

Polymarket — Prediction Market Data

Query prediction market data from Polymarket using their public REST APIs. All endpoints are read-only and require zero authentication.

See references/api-endpoints.md for the full endpoint reference with curl examples.

When to Use

User asks about prediction markets, betting odds, or event probabilities
User wants to know "what are the odds of X happening?"
User asks about Polymarket specifically
User wants market prices, orderbook data, or price history
User asks to monitor or track prediction market movements

Key Concepts

Events contain one or more Markets (1:many relationship)
Markets are binary outcomes with Yes/No prices between 0.00 and 1.00
Prices ARE probabilities: price 0.65 means the market thinks 65% likely
outcomePrices field: JSON-encoded array like ["0.80", "0.20"]
clobTokenIds field: JSON-encoded array of two token IDs [Yes, No] for price/book queries
conditionId field: hex string used for price history queries
Volume is in USDC (US dollars)

Three Public APIs

Track record

Benchmark

15 / 18

test cases passed, vs 9 / 18 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

graniet / kheish

skills/research/polymarket/SKILL.md

View on GitHub ↗

License Apache-2.0Imported 8/3/2026Version v1Bundled 2 files · scripts

Other skills for the same job

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More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Kheish Compatibility

Polymarket — Prediction Market Data

When to Use

Key Concepts

Three Public APIs

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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