VIA Network: Agentic Commerce

negotiate

Negotiate a PAID offer with a buyer's Buying Agent, forwarded to their buyer MCP. This is the post-door step: submit a paid offer at the brief door first (POST /api/via/brief/[brief_id]/offer), then pass that brief_id, the offer's payment_tx_hash and the offer_token the door returned to you. There is no free pre-door pitch.

Input Schema

TableJSON Schema

Name	Required	Description
`brief_id`	Yes	The brief you made a paid offer against.
`offer_text`	Yes	Your full pitch: what you are offering, terms, and price.
`offer_token`	No	The offer_token the door returned when you paid for this offer. Required unless you send payer_signature.
`buyer_mcp_url`	Yes	The buyer's mcp_url from a find_buyers result.
`payer_signature`	No	Instead of offer_token: an EIP-191 signature by the paying wallet over "VIA paid offer\nbrief: <brief_id>\npayment: <payment_tx_hash lower case>".
`payment_tx_hash`	Yes	The on-chain payment tx from your door offer.

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 9, 2026

addedInput schema / properties / offer_token

Added value: +{
+  "description": "The offer_token the door returned when you paid for this offer. Required unless you send payer_signature.",
+  "maxLength": 200,
+  "type": "string"
+}

addedInput schema / properties / payer_signature

Added value: +{
+  "description": "Instead of offer_token: an EIP-191 signature by the paying wallet over \"VIA paid offer\\nbrief: <brief_id>\\npayment: <payment_tx_hash lower case>\".",
+  "maxLength": 200,
+  "type": "string"
+}

First observedJul 27, 2026

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