AssetFare — precomputed cross-chain route intelligence for AI agents

AssetFare saves agent time and tokens by exploring multi-amount candidate curves every 30 minutes. On six Solana-origin Base/Arbitrum pilot corridors, those observations only shortlist three candidates; the caller's request then quotes all three at the actual requested amount and returns at most two choices inside the time profile. Balanced defaults to 60 seconds, fast to 30 seconds, and economy is an explicit slower mode. Candidates over the time limit remain reference-only. Selection reuses the exact request-time quote while valid; after expiry it refreshes only the chosen candidate at the same amount and never silently switches routes. Selection itself is never transaction authority. Caller approves and signs; the server never signs or submits.

Core 2.17.0 quotes also include strict continuation_v3. MCP 1.21.6 verifies the canonical full-quote hash, route-summary hash and fingerprint claim, exact path/providers, caller wallet-chain and event-signer requirements, base-unit bounds, allowed mode and TTL. Every quote remains unranked_candidate; no adapter selects it automatically, and caller_approved:true alone is not human-approval proof.

The portable quote hash removes continuation_v3, replaces duplicated raw base-unit numbers with the exact decimal strings in direct_route_summary, then hashes AssetFare typed-canonical-v1 bytes. That encoding preserves JSON type, uses exact IEEE-754 binary64 bytes for finite numbers, UTF-8 byte lengths and byte-sorted object keys, distinguishes -0 from 0, and rejects every non-substituted integral number outside JavaScript's safe-integer range. The required literal quote_payload_sha256_spec appears both on continuation_v3 and in its fingerprint claim, preventing numeric-string collisions and cross-language precision ambiguity.

AssetFare is an agent-native, non-custodial native-USDC bridge and cross-chain route service. Solana native USDC → Base native USDC is the canonical route: an agent gets a fresh quote and, only after explicit caller approval, a bounded unsigned transaction plan the caller verifies and signs. AssetFare also provides bridge and cross-chain swap routes across 65 curated public route products: 3 core, 50 conditional, and 12 strategic/scarce. AssetFare service fee 1bp; Circle/provider/network fees additional; quote exposes total token-path cost and live availability; server never signs/submits. Solana SOL → Base USDC and Optimism USDC → Base USDC are also supported. AssetFare never receives private keys, signs, or submits.

For product inclusion and review timing, read economic_guidance and the complete research catalog at https://assetfare.dev/route-economics.json. price_recommended_for_amount is advisory; when it is false, compare a fresh all-in quote if price matters. It does not add an acknowledgement field or block prepare/session creation. The API accepts USD 1 as a shared technical minimum.

For agent-wallet funding, use AssetFare for aggregate refills or material transfers rather than reacting to each failed x402 micropayment. Use the route-specific best-from amount and confirm the fresh quote. A wallet that is empty on every supported source chain is not an AssetFare use case.

Verify before trusting: public source, [Ed25519-signed manifest](https://api.asse

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