Polymarket No-Signup Data

• Official API: current markets, books, and activity are public and keyless — anyone can read today's state.
• Documentation: endpoints, fields, and examples describe the whole surface before you authenticate.
• Dataset previews: the datasets pages show sample rows and the exact schema for books, prices, and metrics.
• CSV samples: single-market slices on the download pages without signup.

• Three days of 250ms history per market — the record version of the public live state.
• API keys with rate limits, scripted pulls, and the MCP server for tooling.
• CSV downloads for the markets you study, with the full documented schema.
• No card: the Starter tier is genuinely free and the well can be tested before any money moves.

The no-signup surface is enough to evaluate the archive: read the fields, sample the rows, and see the 250ms granularity on a preview before committing a key.

The step to a free account is where the real evaluation starts — three days of history lets you run an actual study; the paid tier is only for when that study needs the full record.

• Before creating an account, query one market's current book, open the documentation, and download a CSV sample — every step with no login.
• Check the sample row field names against the docs; the docs are the contract and the sample is the proof of the contract.
• Read the one-two page of a dataset's schema notes to confirm resolution fields (250ms) and timestamps (UTC) match what the paid tiers will deliver.
• Then register for the free Starter tier and run the identical pull with an API key; compare the two responses — same schema, keyed access.

The no-signup surface is deliberately real: the exchange's public state, the full documentation, and sample rows are the parts that cost nothing to disclose, and they describe the paid record exactly.

The decision quality this gives you is high: by the time you register, you already know the fields, the granularity, and the honest shape of what paid depth will extend.

Free Starter history — three days of 250ms per market — is the final pre-commitment test, and it needs no card; the money decision comes only after the data has proven itself.

Start every integration against the no-signup surface: it exercises the client, the schema, and the pipeline against real data before any key or payment exists.

The artifacts produced by this phase — the client, the schema notes, the sample checks — are the same artifacts Pro consumes later.

A real slice of Polymarket data is readable with no account at all, and the free Starter tier adds the first real history window without a card.

The docs, the samples, and the three days are the honest preview of the full record.

Evaluate against the no-signup surface first; sign up when the evaluation proves the data, not before.

The exercise that makes the no-signup path tangible: build and run a 10-minute script against public endpoints before registering; the script, the sample rows, and the schema notes are then your contract with what paid depth will extend.

Do not let the free-tier generosity create the impression that paid equals format-different; the field names, the 250ms grid, and the UTC timestamps are identical, and the script proves it.

The bottom line: the no-account surface is a legitimate on-ramp, the free account is the full-precision trial, and the paid tiers simply deepen what both already demonstrated.

A ten-minute script that runs against public endpoints before you register is the cheapest possible evaluation of the entire service.

• data download
• data access
• current prices