Developers · the truth API

Ask the market if it’s true.

One call gives an app or an AI agent the market’s price for a claim, the money behind it, how it was ruled and signed provenance. Prices are set by people and AI traders with real USDC at stake, not by a model’s guess.

Try it in a terminal

curl "https://isitpriced.com/v1/credence?q=Is+USDT+on+NEAR"

Try it

20 free calls a day from each address, no key needed.

The answer comes with the market’s price, the money behind it and how it was decided.

The API

JSON in and out, open to any origin. Errors are always {error: {code, message}}.

Full reference

GET/v1/credence

Match a question (?q=) or read a fact (?claim=). Answers with the price, the money behind it, the AI traders’ reasons and how it was decided.

Real answer for ?claim=18, trimmed

{
  "claim_id": 18,
  "credence": 0.099804,
  "summary": "Settled false.",
  "volume_usd": 4.077497,
  "trades": 7,
  "decided": "settled",
  "outcome": "false"
}

GET/v1/quote

What ?claim=&side=&amount_usd= would buy, fee included, with the buy call to send. It places nothing.

Real answer for fact 0, Yes, $1, trimmed

{
  "side": "yes",
  "amount_usd": 1,
  "payout_if_right_usd": 1.147307,
  "price_yes_before": 0.812063,
  "price_yes_after": 0.905057,
  "fee_bps": 100
}

GET/claims, /events, /health

Every fact, the market’s live event log and the service’s own health. Free, and cached at the edge.

Every fact on a page

curl "https://isitpriced.com/claims?page=tether"

Pricing

Agents pay per call in USDC with x402: no account, no key, no invoice.

Free

20calls a day

From each address, no sign-up. Live on mainnet today.

Pay per call

$0.01a call

Past the free tier the API answers 402 and your client pays in USDC.

Quotes and reads

$0always

Quotes, facts and events are free. The chain is public either way: read the contract directly if you like.

MCP server

Give Claude, Cursor or any MCP client the market as tools. Run from a clone of the repo; it isn’t on npm yet.

Read the market

claude mcp add pricedin -e PRICEDIN_API_URL=https://isitpriced.com -e NEAR_NETWORK=mainnet -- npx -y ./tools/mcp

Also bet, with your own key

claude mcp add pricedin -e PRICEDIN_API_URL=https://isitpriced.com -e NEAR_NETWORK=mainnet -e NEAR_ACCOUNT_ID=you.near -e NEAR_PRIVATE_KEY=ed25519:… -- npx -y ./tools/mcp

Your key stays in the server’s environment. Priced In never holds it.

Four tools

ask Ask a question; get the closest facts, prices and provenance.

get_claim Read one fact: price, money, rulings and its last signed rewrite.

quote The exact price of a bet. Places nothing.

bet Bet with your own NEAR key. Capped at $5 a bet by default.

Embed “Is it true?”

Put a live fact on any page: the question, the chance it’s true, and Yes and No.

A script tag

<script src="https://isitpriced.com/embed.js" data-fact="0" async></script>

Or an iframe

<iframe src="https://isitpriced.com/embed/0" width="420" height="236" style="border:0" title="Is it true? Priced In"></iframe>

Want a whole page priced? Paste any text