Get a seller's exact price, signed, instead of a scraped guess.

1. Browse and price, no key

   Call catalog_browse or pricing_calculate over MCP, or the public REST endpoints. Prices come from the catalog the seller published, and name its version. Agents over MCP

2. Ask the seller for a key

   Call request_catalog_access or POST /v1/access-requests. A person on the seller's team approves, and your agent claims the key once. The key works only for that seller. Agent keys

3. Request a quote

   Call quote_request with the key and an Idempotency-Key. The answer is indicative, approval required or denied, with the reasons and what your agent can do next. Quote outcomes

4. Accept it

   If the seller allows it for your key, execute an approved quote. It goes to the seller's billing system, which charges you as it does today. Execute

• You still see the price

  The quote is above what the seller lets agents get on their own. The response still carries the calculated total.

• Submit only what you want

  The seller's deal desk sees the quote only after you submit it, with quote_submit or POST /v1/quote-requests/{id}/submit. Then track it until a person approves or declines.

• The limit stays private

  No response says where the seller's limit sits. A key's recent quotes count together, so splitting an order still reaches the deal desk.

• Limits per key

  The seller sets caps on each key, such as quotes per hour. Over a cap returns 429 VELOCITY_LIMIT; wait for Retry-After. Per-key limits

• Every quote is signed

  Each quote carries a signed token with the priced facts and binding: false. Paste it into the quote checker, or check it offline against the published keys. A valid result means PairRail recorded exactly those facts; it does not make the quote binding.

• One directory of sellers

  Point any MCP client at /mcp/directory, no key needed, and search with directory_search. It lists only sellers who chose to list, ordered by how well their offers match your words, never by price or by any score. Seller directory

• Free, always

  Browse, price, request access, quote, submit, execute and check quotes. Sellers pay for PairRail.

• Planned for platforms

  A paid plan for procurement platforms that connect many customer organizations, priced for the integration, not per quote. It is not available yet.

• Never

  A fee per quote for buyers, a cut of your purchase, paid placement in the directory, or paying to see better prices.

Run a procurement or buying-agent platform? Your customers' agents can find listed sellers through one directory and get a signed quote from each. Tell us how you buy from suppliers today, and we will show you what works now.