v2.4.0: @x402 2.26 on our own handshake, Astra and Fable on premium, effort on the Messages wire, and a router that indexes

Tagged 2026-09-18. One line per change; the mechanism behind each is on agent402.tools/changelog.

Buyers

Admit openai/gpt-6-astra and anthropic/claude-fable-5.1 on the premium tier.
Add top-level effort on the Messages wire for Claude 4.7+; refuse speed other than standard.
Move transcribe onto gpt-transcribe with a 4-minute cap.
Add /api/chain/<verb> (35 RPC verbs) and five chain reads: chain-nonce, chain-storage, chain-pending, chain-total-supply, chain-erc1155-balance; a contract revert is a 422.
Add POST /api/attest (EAS attestation on Base for a settled call) and POST /api/feedback / GET /api/feedback/summary.
Answer /api/route from a candidate index; validate Exa search categories; read Polymarket price history from the Data API.
Add /x402-test (/conformance, /debug), the payment-refusal diagnostic.
Add POST /api/seller-dossier ($0.05), sanctions-wallet and sanctions-name.

List a migrated seller once: a verified succession retires the predecessor while the successor is live.
Read a route that answers 200 with no paywall as free; re-registration re-asks every learned price.
Read every OpenAPI payment-annotation dialect and object-shaped manifest prices.
Default GET /api/leaderboard to include=external; the host's own row carries self: true.

Upgrade @x402/* to 2.26.0 and @solana/kit to 8.3.0; base image on Node 22.23.2; mppx 0.9.3.
Reorder settle fallback: Solvador first where it advertises the network, then PayAI.
Wallet-only tools consult the settle-failure breaker before the handler (per wallet only).

agent402-mcp 0.13.2, agent402-openclaw 0.4.3, elizaos-plugin-agent402 0.2.3, agent402-agentkit 0.1.3, agent402-tollbooth 0.10.1, agent402-client 0.8.6, agent402-ai-sdk 0.2.7, agent402-google-adk 0.1.7.