Blackwall X402 Guardrail alternatives

1

POPCORN MCP

by violetclaire

B

Signed time and SHA-256 witness receipts for agents, with offline verification and x402 payment.

Read crypto reference prices and verify signed receipts. Includes limited keyless samples.

Authorize x402 payments before signing with request-bound, signed safety decisions.

4

X402 List

by x402-list.com

A

Find and vet x402 payment APIs before your agent pays one: uptime, price, on-chain volume.

5

PipRail

by piprail

B

Budget-bound x402 payment wallet for AI agents — pays HTTP 402 URLs, capped locally. No backend.

6

AllRatesToday exchange rates (hosted)

by allratestoday.com

A

Live FX + official central-bank rates, 110+ sources. Hosted, keyless, nothing to install.

7

X402 Data Gateway

by epistemedeus

B

Paid x402 and MPP tools for agent discovery, payment safety, data, and DeFi.

Lint an HTTP endpoint's x402 402 conformance; decode X-PAYMENT blobs; inspect a facilitator.

9

gate402 merchant checkout

by ogenalabs.com

A

Drop-in x402 checkout for merchants: issue terms, verify payment. $0.01 each.

Israeli invoice payment gate with PAY/HOLD/BLOCK decisions and public company-registry evidence.

11

Anyway Possible Paid Agent Utilities

by anyway-possible

A

Paid x402 tools for merchant intelligence, Base payment readiness, and verifiable web evidence.

12

BankMCP™

by noskillish

A

Read-only MCP server for your own bank accounts via Enable Banking. Self-hosted, one user.

13

Blockrun

by BlockRunAI

B

Web search, deep research, prediction markets & crypto data for AI agents. Pay per call via x402.

14

Hive Intelligence MCP

by hiveintelligence.xyz

B

Evidence-backed crypto due diligence with sources, freshness, and a runtime receipt on every call.

15

Agent402.Tools: pay-per-call web tools

by MikeyPetrillo

A

Agentic Finance: 500+ agent tools, multi-chain USDC over x402 or MPP, free via PoW or card credits

16

CoinRithm Agent Trading

by CoinRithm

B

Keyless prediction-market data across 12 venues plus paper-trading of crypto spot, futures, and PM.

17

Churnkey

by churnkey.co

A

Read and manage Churnkey cancel flows, retention metrics, and payment recovery

18

K-Data — Korean Sell-Side Research & Market Data

by juh5ng

A

Korean equity research, analyst revisions, kimchi premium and news via x402.

19

Signalfuse

by hypeprinter007-stack

B

11 tools: crypto signals, sentiment, macro regime, arena, search, exec. x402 pay-per-call.

20

Easypaydirect

by praveendias1180

B

Read-only MCP server for the Easy Pay Direct (EPD) / NMI-family payment gateway Query API.

21

payware

by payware

B

payware A2A payments API for merchants, ISVs and payment institutions

Stock verdicts, trend stage, P&F, breadth, macro regime, SEC filings. Free key: api.vanoe.ai/signup

23

Crawlora MCP

by crawlora.net

A

Hosted MCP: 1873 structured web-data tools for search, maps, commerce, social, gaming & finance.

24

RiskState — Crypto Risk Engine

by riskstate.ai

A

Live BTC/ETH risk state: risk policy, market structure and trading playbooks. Keyless free tier.