# Kite Agent Passport vs Sponge Wallet

> Kite Agent Passport scores 51.5 (D) to Sponge Wallet's 43.2 (E) for onchain wallets. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/kite-agent-passport-vs-sponge-wallet
- Markdown: https://www.anchorterminal.com/compare/kite-agent-passport-vs-sponge-wallet.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/kite-agent-passport-vs-sponge-wallet.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/kite-agent-passport-vs-sponge-wallet.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-10

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.

- Kite Agent Passport: grade D, 51.5/100, rank #755 of 961. Markdown https://www.anchorterminal.com/tools/kite-agent-passport.md · JSON https://www.anchorterminal.com/api/v1/tools/kite-agent-passport.json
- Sponge Wallet: grade E, 43.2/100, rank #893 of 961. Markdown https://www.anchorterminal.com/tools/sponge-wallet.md · JSON https://www.anchorterminal.com/api/v1/tools/sponge-wallet.json
- Best agent wallets and spending controls: https://www.anchorterminal.com/best/agent-wallets/index.md
- All 30 wallets comparisons: https://www.anchorterminal.com/compare/agent-wallets/index.md

## Which one, for what

### Kite Agent Passport (D)

Good 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)

Good 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

| Category | Weight | Kite Agent Passport | Sponge Wallet | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 13 | Kite Agent Passport +22 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 64 | 66 | Sponge Wallet +2 |
| Agent ergonomics | 13% (16.2 this run) | 68 | 43 | Kite Agent Passport +25 |
| Security & auth | 14% (17.5 this run) | 72 | 48 | Kite Agent Passport +24 |
| Payments & pricing | 10% (12.5 this run) | 35 | 70 | Sponge Wallet +35 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 71 | 27 | Kite Agent Passport +44 |
| Transparency & trust | 7% (8.8 this run) | 56 | 39 | Kite Agent Passport +17 |
| Negative events | ≤15 | -5 | 0 | |
| **Total** | | **51.5 · D** | **43.2 · E** | |

## Facts side by side

| Fact | Kite Agent Passport | Sponge Wallet |
| --- | --- | --- |
| Kind | Platform | HTTP API |
| Vendor | Kite AI | Sponge Inc. |
| Hosted endpoint | no (local only) | `https://api.wallet.paysponge.com` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Pay per use | Free |
| x402 | payer tooling only | payer tooling only |
| Licence | Closed 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 documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-07 | 2026-07-07 |
| Terms last updated |  | 2026-06-30 |
| Privacy policy last updated |  | 2026-06-30 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | not found in the text |
| Terms restrict benchmarking |  | not found in the text |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | not found in the text |
| Popularity | none | 126 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.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/kite-agent-passport-vs-sponge-wallet.json, and with the fewest tokens: https://www.anchorterminal.com/compare/kite-agent-passport-vs-sponge-wallet.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "kite-agent-passport", "b": "sponge-wallet"}`. From a terminal: `anchor compare kite-agent-passport sponge-wallet`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/kite-agent-passport.json and https://www.anchorterminal.com/api/v1/tools/sponge-wallet.json

## Other comparisons with Kite Agent Passport or Sponge Wallet

- [Agentcard vs Kite Agent Passport](https://www.anchorterminal.com/compare/agentcard-vs-kite-agent-passport.md)
- [Agentcard vs Sponge Wallet](https://www.anchorterminal.com/compare/agentcard-vs-sponge-wallet.md)
- [Circle Wallets (Agent Wallets, Programmable Wallets) vs Kite Agent Passport](https://www.anchorterminal.com/compare/circle-wallets-vs-kite-agent-passport.md)
- [Circle Wallets (Agent Wallets, Programmable Wallets) vs Sponge Wallet](https://www.anchorterminal.com/compare/circle-wallets-vs-sponge-wallet.md)
- [Coinbase Developer Platform (Agentic Wallet, AgentKit, CDP MCP) vs Kite Agent Passport](https://www.anchorterminal.com/compare/coinbase-cdp-agentkit-vs-kite-agent-passport.md)
- [Coinbase Developer Platform (Agentic Wallet, AgentKit, CDP MCP) vs Sponge Wallet](https://www.anchorterminal.com/compare/coinbase-cdp-agentkit-vs-sponge-wallet.md)
- [Kite Agent Passport vs Openfort](https://www.anchorterminal.com/compare/kite-agent-passport-vs-openfort.md)
- [Kite Agent Passport vs Privy Wallets (server wallets, agent wallets, policy engine)](https://www.anchorterminal.com/compare/kite-agent-passport-vs-privy.md)
- [Kite Agent Passport vs Turnkey Agentic Wallets](https://www.anchorterminal.com/compare/kite-agent-passport-vs-turnkey-agentic-wallets.md)
- [Openfort vs Sponge Wallet](https://www.anchorterminal.com/compare/openfort-vs-sponge-wallet.md)
- [Privy Wallets (server wallets, agent wallets, policy engine) vs Sponge Wallet](https://www.anchorterminal.com/compare/privy-vs-sponge-wallet.md)
- [Sponge Wallet vs Turnkey Agentic Wallets](https://www.anchorterminal.com/compare/sponge-wallet-vs-turnkey-agentic-wallets.md)