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AssetFare USDC Bridge

by io.github.assetfare
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assetfare_v2_prepare

Return one deeply verified first unsigned bundle plus a self-verifying caller-wallet handoff. Callers must explicitly pass caller_approved=true, approval_v3 selected as one_shot, and the hash-bound verification_context copied from the exact quote/public wallets; multi-step quotes reject one_shot. Example: pass the exact context saved during quote selection. Context is validated before the upstream request and never forwarded. caller_approved:true is not human proof; AssetFare never signs or submits.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
walletsYesMap each chain needed by this route to the caller's public wallet address. Include public addresses only; never private keys or seed phrases.
to_chainYesDestination chain for the v2 route: Solana, Base, Arbitrum, or Robinhood Chain. Source-only chains are not destinations.
to_tokenYesOutput token symbol on to_chain. The chain-token pair must appear in current v2 capabilities.
amount_usdYesRequested input value in USD, minimum 1. USD 1 is reachability/schema smoke only. A USD 50 competitive bucket was observed only for dated 2026-09-23 Solana USDC to Base USDC evidence and must not be generalized to another corridor. USD 1,000 is the primary representative amount. SOL input includes a swap. Always quote the actual intended amount.
from_chainYesSource chain for the v2 route. Polygon, Optimism, Ethereum, HyperEVM, X Layer, Sei, Sonic, Monad, Avalanche, Cronos, Injective, Linea, and Aptos are source-only and cannot be used as to_chain.
from_tokenYesInput token symbol on from_chain. The chain-token pair must appear in current v2 capabilities.
approval_v3YesStrict one-shot approval copied from the exact unexpired selected quote; its bounds may only be strengthened.
caller_approvedYesLegacy caller assertion that MUST be supplied explicitly. It is not human-proof and is never auto-inserted; approval_v3 adds server-enforced quote binding.
event_signer_publicNoSolana CCTP only: caller-generated ephemeral public key. Keep the matching private key client-side and use it to co-sign the returned unsigned event-account transaction; never send the private key.
verification_contextYesStrict caller-held one-shot context copied from the selected quote, approval and public wallets. It is verified before prepare and never forwarded upstream.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
bundleYesExact Core bundle whose payload_sha256 remains scoped only to this nested object.
action_verificationYesFail-closed semantic and approval-bound verification result; it never authorizes a signature by itself.
caller_wallet_handoffYesFresh self-verifying EIP-1193 or Solana Wallet Standard handoff. The caller still simulates, confirms, signs and submits.
semantic_verificationYesTrue only after full decoded action, intent, receipt, payload and caller-bound verification.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed8 schema fields changed
    • changedInput schema / properties / from_chain / description
      Previous value: -"Source chain for the v2 route. Polygon, Optimism, Ethereum, HyperEVM, X Layer, Sei and Sonic are source-only and cannot be used as to_chain."New value: +"Source chain for the v2 route. Polygon, Optimism, Ethereum, HyperEVM, X Layer, Sei, Sonic, Monad, Avalanche, Cronos, Injective, Linea, and Aptos are source-only and cannot be used as to_chain."
    • changedInput schema / properties / from_chain / enum
      Previous value: -[
-  "solana",
-  "base",
-  "arbitrum",
-  "robinhood",
-  "polygon",
-  "optimism",
-  "ethereum",
-  "hyperevm",
-  "xlayer",
-  "sei",
-  "sonic"
-]New value: +[
+  "solana",
+  "base",
+  "arbitrum",
+  "robinhood",
+  "polygon",
+  "optimism",
+  "ethereum",
+  "hyperevm",
+  "xlayer",
+  "sei",
+  "sonic",
+  "monad",
+  "avalanche",
+  "cronos",
+  "injective",
+  "linea",
+  "aptos"
+]
    • changedInput schema / properties / verification_context / properties / direct_route_summary / properties / from / enum
      Previous value: -[
-  "solana:SOL",
-  "solana:USDC",
-  "solana:USDG",
-  "base:ETH",
-  "base:USDC",
-  "arbitrum:ETH",
-  "arbitrum:USDC",
-  "robinhood:ETH",
-  "robinhood:USDG",
-  "polygon:USDC",
-  "optimism:USDC",
-  "ethereum:USDC",
-  "hyperevm:USDC",
-  "xlayer:USDC",
-  "sei:USDC",
-  "sonic:USDC"
-]New value: +[
+  "solana:SOL",
+  "solana:USDC",
+  "solana:USDG",
+  "base:ETH",
+  "base:USDC",
+  "arbitrum:ETH",
+  "arbitrum:USDC",
+  "robinhood:ETH",
+  "robinhood:USDG",
+  "polygon:USDC",
+  "optimism:USDC",
+  "ethereum:USDC",
+  "hyperevm:USDC",
+  "xlayer:USDC",
+  "sei:USDC",
+  "sonic:USDC",
+  "monad:USDC",
+  "avalanche:USDC",
+  "cronos:USDC",
+  "injective:USDC",
+  "linea:USDC",
+  "aptos:USDC"
+]
    • changedInput schema / properties / verification_context / properties / direct_route_summary / properties / mode / enum
      Previous value: -[
-  "cctp_direct_composition",
-  "optimism_source_cctp",
-  "polygon_source_cctp",
-  "robinhood_across_ingress_composition",
-  "robinhood_paxos_egress_composition",
-  "robinhood_paxos_ingress_composition",
-  "same_chain_direct",
-  "same_chain_direct_composition"
-]New value: +[
+  "aptos_move_cctp_direct",
+  "cctp_direct_composition",
+  "optimism_source_cctp",
+  "polygon_source_cctp",
+  "robinhood_across_ingress_composition",
+  "robinhood_paxos_egress_composition",
+  "robinhood_paxos_ingress_composition",
+  "same_chain_direct",
+  "same_chain_direct_composition"
+]
    • changedInput schema / properties / verification_context / properties / direct_route_summary / properties / route / enum
      Previous value: -[
-  "solana:SOL->solana:USDC",
-  "solana:SOL->solana:USDG",
-  "solana:SOL->base:ETH",
-  "solana:SOL->base:USDC",
-  "solana:SOL->arbitrum:ETH",
-  "solana:SOL->arbitrum:USDC",
-  "solana:SOL->robinhood:ETH",
-  "solana:SOL->robinhood:USDG",
-  "solana:USDC->solana:SOL",
-  "solana:USDC->solana:USDG",
-  "solana:USDC->base:ETH",
-  "solana:USDC->base:USDC",
-  "solana:USDC->arbitrum:ETH",
-  "solana:USDC->arbitrum:USDC",
-  "solana:USDC->robinhood:ETH",
-  "solana:USDC->robinhood:USDG",
-  "solana:USDG->solana:SOL",
-  "solana:USDG->solana:USDC",
-  "solana:USDG->base:ETH",
-  "solana:USDG->base:USDC",
-  "solana:USDG->arbitrum:ETH",
-  "solana:USDG->arbitrum:USDC",
-  "solana:USDG->robinhood:ETH",
-  "solana:USDG->robinhood:USDG",
-  "base:ETH->solana:SOL",
-  "base:ETH->solana:USDC",
-  "base:ETH->solana:USDG",
-  "base:ETH->base:USDC",
-  "base:ETH->arbitrum:ETH",
-  "base:ETH->arbitrum:USDC",
-  "base:ETH->robinhood:ETH",
-  "base:ETH->robinhood:USDG",
-  "base:USDC->solana:SOL",
-  "base:USDC->solana:USDC",
-  "base:USDC->solana:USDG",
-  "base:USDC->base:ETH",
-  "base:USDC->arbitrum:ETH",
-  "base:USDC->arbitrum:USDC",
-  "base:USDC->robinhood:ETH",
-  "base:USDC->robinhood:USDG",
-  "arbitrum:ETH->solana:SOL",
-  "arbitrum:ETH->solana:USDC",
-  "arbitrum:ETH->solana:USDG",
-  "arbitrum:ETH->base:ETH",
-  "arbitrum:ETH->base:USDC",
-  "arbitrum:ETH->arbitrum:USDC",
-  "arbitrum:ETH->robinhood:ETH",
-  "arbitrum:ETH->robinhood:USDG",
-  "arbitrum:USDC->solana:SOL",
-  "arbitrum:USDC->solana:USDC",
-  "arbitrum:USDC->solana:USDG",
-  "arbitrum:USDC->base:ETH",
-  "arbitrum:USDC->base:USDC",
-  "arbitrum:USDC->arbitrum:ETH",
-  "arbitrum:USDC->robinhood:ETH",
-  "arbitrum:USDC->robinhood:USDG",
-  "robinhood:ETH->solana:SOL",
-  "robinhood:ETH->solana:USDC",
-  "robinhood:ETH->solana:USDG",
-  "robinhood:ETH->base:ETH",
-  "robinhood:ETH->base:USDC",
-  "robinhood:ETH->arbitrum:ETH",
-  "robinhood:ETH->arbitrum:USDC",
-  "robinhood:ETH->robinhood:USDG",
-  "robinhood:USDG->solana:SOL",
-  "robinhood:USDG->solana:USDC",
-  "robinhood:USDG->solana:USDG",
-  "robinhood:USDG->base:ETH",
-  "robinhood:USDG->base:USDC",
-  "robinhood:USDG->arbitrum:ETH",
-  "robinhood:USDG->arbitrum:USDC",
-  "robinhood:USDG->robinhood:ETH",
-  "polygon:USDC->base:USDC",
-  "polygon:USDC->arbitrum:USDC",
-  "optimism:USDC->base:USDC",
-  "optimism:USDC->arbitrum:USDC",
-  "ethereum:USDC->solana:USDC",
-  "ethereum:USDC->base:USDC",
-  "hyperevm:USDC->solana:USDC",
-  "hyperevm:USDC->base:USDC",
-  "xlayer:USDC->solana:USDC",
-  "xlayer:USDC->base:USDC",
-  "sei:USDC->solana:USDC",
-  "sei:USDC->base:USDC",
-  "sonic:USDC->solana:USDC",
-  "sonic:USDC->base:USDC"
-]New value: +[
+  "solana:SOL->solana:USDC",
+  "solana:SOL->solana:USDG",
+  "solana:SOL->base:ETH",
+  "solana:SOL->base:USDC",
+  "solana:SOL->arbitrum:ETH",
+  "solana:SOL->arbitrum:USDC",
+  "solana:SOL->robinhood:ETH",
+  "solana:SOL->robinhood:USDG",
+  "solana:USDC->solana:SOL",
+  "solana:USDC->solana:USDG",
+  "solana:USDC->base:ETH",
+  "solana:USDC->base:USDC",
+  "solana:USDC->arbitrum:ETH",
+  "solana:USDC->arbitrum:USDC",
+  "solana:USDC->robinhood:ETH",
+  "solana:USDC->robinhood:USDG",
+  "solana:USDG->solana:SOL",
+  "solana:USDG->solana:USDC",
+  "solana:USDG->base:ETH",
+  "solana:USDG->base:USDC",
+  "solana:USDG->arbitrum:ETH",
+  "solana:USDG->arbitrum:USDC",
+  "solana:USDG->robinhood:ETH",
+  "solana:USDG->robinhood:USDG",
+  "base:ETH->solana:SOL",
+  "base:ETH->solana:USDC",
+  "base:ETH->solana:USDG",
+  "base:ETH->base:USDC",
+  "base:ETH->arbitrum:ETH",
+  "base:ETH->arbitrum:USDC",
+  "base:ETH->robinhood:ETH",
+  "base:ETH->robinhood:USDG",
+  "base:USDC->solana:SOL",
+  "base:USDC->solana:USDC",
+  "base:USDC->solana:USDG",
+  "base:USDC->base:ETH",
+  "base:USDC->arbitrum:ETH",
+  "base:USDC->arbitrum:USDC",
+  "base:USDC->robinhood:ETH",
+  "base:USDC->robinhood:USDG",
+  "arbitrum:ETH->solana:SOL",
+  "arbitrum:ETH->solana:USDC",
+  "arbitrum:ETH->solana:USDG",
+  "arbitrum:ETH->base:ETH",
+  "arbitrum:ETH->base:USDC",
+  "arbitrum:ETH->arbitrum:USDC",
+  "arbitrum:ETH->robinhood:ETH",
+  "arbitrum:ETH->robinhood:USDG",
+  "arbitrum:USDC->solana:SOL",
+  "arbitrum:USDC->solana:USDC",
+  "arbitrum:USDC->solana:USDG",
+  "arbitrum:USDC->base:ETH",
+  "arbitrum:USDC->base:USDC",
+  "arbitrum:USDC->arbitrum:ETH",
+  "arbitrum:USDC->robinhood:ETH",
+  "arbitrum:USDC->robinhood:USDG",
+  "robinhood:ETH->solana:SOL",
+  "robinhood:ETH->solana:USDC",
+  "robinhood:ETH->solana:USDG",
+  "robinhood:ETH->base:ETH",
+  "robinhood:ETH->base:USDC",
+  "robinhood:ETH->arbitrum:ETH",
+  "robinhood:ETH->arbitrum:USDC",
+  "robinhood:ETH->robinhood:USDG",
+  "robinhood:USDG->solana:SOL",
+  "robinhood:USDG->solana:USDC",
+  "robinhood:USDG->solana:USDG",
+  "robinhood:USDG->base:ETH",
+  "robinhood:USDG->base:USDC",
+  "robinhood:USDG->arbitrum:ETH",
+  "robinhood:USDG->arbitrum:USDC",
+  "robinhood:USDG->robinhood:ETH",
+  "polygon:USDC->base:USDC",
+  "polygon:USDC->arbitrum:USDC",
+  "optimism:USDC->base:USDC",
+  "optimism:USDC->arbitrum:USDC",
+  "ethereum:USDC->solana:USDC",
+  "ethereum:USDC->base:USDC",
+  "hyperevm:USDC->solana:USDC",
+  "hyperevm:USDC->base:USDC",
+  "xlayer:USDC->solana:USDC",
+  "xlayer:USDC->base:USDC",
+  "sei:USDC->solana:USDC",
+  "sei:USDC->base:USDC",
+  "sonic:USDC->solana:USDC",
+  "sonic:USDC->base:USDC",
+  "monad:USDC->solana:USDC",
+  "monad:USDC->base:USDC",
+  "avalanche:USDC->solana:USDC",
+  "avalanche:USDC->base:USDC",
+  "cronos:USDC->solana:USDC",
+  "cronos:USDC->base:USDC",
+  "injective:USDC->solana:USDC",
+  "injective:USDC->base:USDC",
+  "linea:USDC->solana:USDC",
+  "linea:USDC->base:USDC",
+  "aptos:USDC->solana:USDC",
+  "aptos:USDC->base:USDC"
+]
    • changedInput schema / properties / verification_context / properties / direct_route_summary / properties / steps / items / properties / from / enum
      Previous value: -[
-  "solana:SOL",
-  "solana:USDC",
-  "solana:USDG",
-  "base:ETH",
-  "base:USDC",
-  "arbitrum:ETH",
-  "arbitrum:USDC",
-  "robinhood:ETH",
-  "robinhood:USDG",
-  "polygon:USDC",
-  "optimism:USDC",
-  "ethereum:USDC",
-  "hyperevm:USDC",
-  "xlayer:USDC",
-  "sei:USDC",
-  "sonic:USDC"
-]New value: +[
+  "solana:SOL",
+  "solana:USDC",
+  "solana:USDG",
+  "base:ETH",
+  "base:USDC",
+  "arbitrum:ETH",
+  "arbitrum:USDC",
+  "robinhood:ETH",
+  "robinhood:USDG",
+  "polygon:USDC",
+  "optimism:USDC",
+  "ethereum:USDC",
+  "hyperevm:USDC",
+  "xlayer:USDC",
+  "sei:USDC",
+  "sonic:USDC",
+  "monad:USDC",
+  "avalanche:USDC",
+  "cronos:USDC",
+  "injective:USDC",
+  "linea:USDC",
+  "aptos:USDC"
+]
    • changedInput schema / properties / wallets / additionalProperties / description
      Previous value: -"Caller-owned public wallet address: 0x plus 40 hex characters for EVM, or 32-44 base58 characters for Solana. Never provide secret key material."New value: +"Caller-owned public wallet address: 0x plus 40 hex characters for EVM, 0x plus 64 hex characters for Aptos, or 32-44 base58 characters for Solana. Never provide secret key material."
    • changedInput schema / properties / wallets / propertyNames / enum
      Previous value: -[
-  "solana",
-  "base",
-  "arbitrum",
-  "robinhood",
-  "polygon",
-  "optimism",
-  "ethereum",
-  "hyperevm",
-  "xlayer",
-  "sei",
-  "sonic"
-]New value: +[
+  "solana",
+  "base",
+  "arbitrum",
+  "robinhood",
+  "polygon",
+  "optimism",
+  "ethereum",
+  "hyperevm",
+  "xlayer",
+  "sei",
+  "sonic",
+  "monad",
+  "avalanche",
+  "cronos",
+  "injective",
+  "linea",
+  "aptos"
+]
  2. First observed

TDQS

A4/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Goes well beyond the annotations: 'Context is validated before the upstream request and never forwarded,' 'caller_approved:true is not human proof,' 'AssetFare never signs or submits,' and the one_shot rejection rule. These disclose validation timing, data-handling behavior, and the non-authoritative nature of the approval flag that no annotation conveys.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Dense, front-loaded with the return value, and no sentence is filler. The final 'Example: pass the exact context saved during quote selection' is somewhat redundant with earlier text but reinforces the key constraint. Jargon-heavy phrasing costs a small amount of clarity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 10-parameter tool with deeply nested objects and an output schema, the description covers the critical preconditions, the validation/forwarding behavior, and the no-signing guarantee. Given the output schema exists, return-shape details are rightly omitted; only the routing to sibling tools is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so baseline is 3, but the description adds cross-parameter semantics: caller_approved is explicitly not human proof, verification_context must be copied from the exact quote/public wallets, and approval_v3 must be one_shot. These relational constraints are not derivable from the schema alone.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States specifically what it returns: 'one deeply verified first unsigned bundle plus a self-verifying caller-wallet handoff.' The verb is weak ('Return') and the description never references sibling tools like assetfare_v2_quote or the session tools, so the agent must infer this belongs to a quote-to-unsigned-bundle pipeline. Purpose is clear but lacks sibling differentiation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Preconditions are stated ('must explicitly pass caller_approved=true, approval_v3 selected as one_shot, and the hash-bound verification_context copied from the exact quote'), and 'multi-step quotes reject one_shot' implies when it will fail. But it never names an alternative tool or states when to prefer quote/session tools over prepare; usage is implied through the quote sequence rather than spelled out.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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