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Head to head · Onchain wallets · October 2026 research run

Kite Agent Passport vs Sponge Wallet

Kite Agent Passport scores 51.5 (D) on agent readiness against Sponge Wallet's 43.2 (E), and leads in 5 of 7 scored categories. Sponge Wallet leads on payments & pricing. Both do onchain wallets.

Best agent wallets and spending controls · All 30 wallets comparisons

Kite Agent PassportKite AI · Platform D51.5/100#755 of 961 Sponge WalletSponge Inc. · HTTP API E43.2/100#893 of 961

Which one, for what

Kite Agent Passport D

Best for Coding agents such as Claude Code or Codex that need to pay x402 or MPP services within budgets a person approves by passkey.

Ahead on

  • Reliability, 35 against 13
  • Agent ergonomics, 68 against 43
  • Security & auth, 72 against 48
  • Maintenance & community, 71 against 27
  • Transparency & trust, 56 against 39

Watch for

A person signs up by email, clicks a verification link and creates a passkey in a browser before any agent can spend

Sponge Wallet E

Best for A developer who wants an agent to hold stablecoins and pay x402 or MPP endpoints within minutes, with cards, bank rails and Hyperliquid or Polymarket trading behind the same key.

Ahead on

  • Payments & pricing, 70 against 35

Also in its favour

  • A hosted endpoint, with nothing to install
  • No incidents deducted, where Kite Agent Passport loses 5 points for them

Watch for

No status page, SLA or numeric rate limit was found, and the terms say the service may be offered in beta

Score by category

CategoryWeight this runKite Agent PassportSponge WalletEdge
Reliability16%203513Kite Agent Passport +22
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26466Sponge Wallet +2
Agent ergonomics13%16.26843Kite Agent Passport +25
Security & auth14%17.57248Kite Agent Passport +24
Payments & pricing10%12.53570Sponge Wallet +35
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87127Kite Agent Passport +44
Transparency & trust7%8.85639Kite Agent Passport +17
Negative events≤15-50
TotalD 51.5/100E 43.2/100

Facts side by side

FactKite Agent PassportSponge Wallet
KindPlatformHTTP API
VendorKite AISponge Inc.
Hosted endpointno (local only)https://api.wallet.paysponge.com
TransportsHTTPHTTP
AuthOAuth or keyOAuth or key
PricingPay per useFree
x402payer tooling onlypayer tooling only
LicenceClosed service under terms from Datalego Inc. dated 29 April 2026. The Passport Skills repository is MIT. The kpass CLI is distributed as binaries and its source repository is private.Proprietary service under Sponge's terms of service. The SDK and CLI packages on npm are MIT, and the repository they name is private
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-072026-07-07
Terms last updated2026-06-30
Privacy policy last updated2026-06-30
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularitynone126 npm/wk, 20 PyPI/wk

Verdicts

Kite Agent Passport

Spending sessions with per-transaction and total caps, a lifetime and passkey approval are enforced by the service, with step-up checks and an audit log. A person must sign up by email and create a passkey before an agent can pay. No published fee rate, OpenAPI file or Passport status page was found.

Sponge Wallet

An agent can register a wallet with one unauthenticated call and pay x402 or MPP endpoints under daily, weekly and monthly limits enforced on Sponge's servers. No status page, rate limits, fee schedule, custody statement or security contact was found, the terms run to eleven short clauses, and the SDK was last published on 7 July 2026.

Before you call either

Kite Agent Passport

  1. Run kpass with --output json --no-interactive and branch on the exit code and error_code. Exit 6 is a session policy breach, so request a new session rather than logging in again
  2. Pass --idempotency-key on every kpass session execute so a retry after a timeout does not pay twice
  3. Ask the person for a session with a small per-transaction cap and a short --ttl, and confirm the merchant URL before executing
  4. Use kpass sandbox test mode and the faucet to try a payment flow without real funds. Scoped cards are not available in sandbox
  5. Check the kite-passport skill's trigger rules before installing it, since it directs the agent to paid services ahead of free tools

Sponge Wallet

  1. Send Sponge-Version on every REST request. The skill file marks it required and the API answers with version status headers
  2. Use evmTransfer and solanaTransfer, the helpers the docs describe as enforcing allowlists and spending limits, not plain transfer
  3. Store the apiKey from registration at once. It is returned a single time, and losing it means registering again
  4. Call GET /api/discover/{serviceId} before POST /api/paid/fetch. The skill file says direct service URLs fail with auth errors
  5. Treat card details output as secret. It returns an encrypted card number and CVC with a one-time secret_key

Questions

Which is better for AI agents, Kite Agent Passport or Sponge Wallet?

Kite Agent Passport scores 51.5 (D) on agent readiness against Sponge Wallet's 43.2 (E), and leads in 5 of 7 scored categories. Sponge Wallet leads on payments & pricing.

Can an agent call Kite Agent Passport and Sponge Wallet without installing anything?

No hosted endpoint is listed for Kite Agent Passport. Sponge Wallet has a hosted endpoint at https://api.wallet.paysponge.com.

Other comparisons with Kite Agent Passport or Sponge Wallet

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