QAmcp

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Directory / ExchangeRebel — pay-per-call APIs for AI agents (x402 on Solana)

ExchangeRebel — pay-per-call APIs for AI agents (x402 on Solana)

Q: Is ExchangeRebel — pay-per-call APIs for AI agents (x402 on Solana) MCP server safe?

QAmcp's test on 29 Oct 2026: No hidden instructions were found in its tool descriptions. 0 of its 60 tools are labeled read-only; the others may change or send things. Overall it scored 77/100 on 29 Oct 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by exchangerebel.com · https://exchangerebel.com/mcp

180 pay-per-call APIs for AI agents: market, company, weather and dev tools, x402 on Solana.

184 tools✓ no account neededPricing: not listed

Visit website

77 /100

PASS · WITH NOTES

Partial: 8 of 11 checks · 29 Oct 2026

Is ExchangeRebel — pay-per-call APIs for AI agents (x402 on Solana) MCP server safe?

No hidden instructions were found in its tool descriptions.
0 of its 60 tools are labeled read-only; the others may change or send things.
Overall it scored 77/100 on 29 Oct 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What it can do

60 tools, in the server's own words.

a2a_send

Send one 1:1 direct message through the A2A ciphertext relay: {from, to|to_handle, ciphertext (base64, delivered receipt.

access_crawl

Accessibility findings for every same-origin page in a site's sitemap (max 50 pages) in one combined stored report, priced from the sitemap before payment (x40…

access_crawl_preflight

FREE preflight for access_crawl.

access_scan

Accessibility findings for one page from automated checks in a real headless browser, $0.05 per call (x402; price RULED).

access_scan_preflight

FREE preflight for access_scan.

address_bundle

Address-validation bundle at $0.01 flat (any leg count): fan one structured address out to 2-3 live legs (nl|ca|us); results come back in request order, one pe…

address_leg_nl

Netherlands address-validation leg (BAG via PDOK Locatieserver, CC BY 4.0) at $0.005/call: returns matched / partial / no_match with the returned components an…

address_leg_us

United States address-validation leg (U.S.

address_verify

Verify an address in 1-4 countries.

anomaly_batch

Batch anomaly detection: 1..100 series (each 8..10,000 points, <= 100,000 points total), flat $0.25, per-series per-point results in request order, each with i…

anomaly_detect

Anomaly detection for one numeric time series (8..10,000 points): per-point robust score (median/MAD robust z), boolean flag, and the signals that fired (robus…

atlas_changes

Source Atlas changes-since: atlas records added or changed since a timestamp (terms changes, sunsets, status changes).

atlas_record

Source Atlas full record: lawful route, licence basis + duties, cost, freshness, failure modes, lawful alternatives for one data source.

atlas_route

Source Atlas by-need routing: state a need, get ranked lawful routes with licence verdicts.

batch_score

Score batch-payment vouchers for settlement risk.

books_author

Author metadata by Open Library author id.

books_authors

Search authors (Open Library).

books_isbn

Book metadata by ISBN (Open Library, metadata only).

books_search

Search books (Open Library, metadata only).

books_title

Book metadata by title (Open Library).

books_works

Work metadata by Open Library work id.

bridge_score

Score a bridge by security, liquidity, and incidents.

carbon_intensity_current

Current average grid carbon intensity for one zone.

carbon_intensity_forecast

Forecast average carbon intensity curve for one zone.

and 36 more

Test results

Safe mode: only tools labeled read-only were run. How the test works

!
Ready for the newest MCP version
1 warning
- !Uses an older MCP version (2025-06-18). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
!
Every tool is described
2268 warnings
- !access_crawl_preflight: Inputs with no description: sitemap_url, url
- !access_scan_preflight: Inputs with no description: url
- !atlas_record: Inputs with no description: source_id
- !atlas_route: Inputs with no description: need
- !cited_answer_search: Inputs with no description: query
- !commons_cast_ballot: Inputs with no description: id, proposal_id, operator_id, choice
- !commons_create_post: Inputs with no description: id, proposal_id, operator_id, body
- !commons_create_proposal: Inputs with no description: operator_id, title, body, category, scope, reopen_condition
- and 32 more
note
!
Tools are labeled safe or dangerous
1 warning
- !184 of 184 tools have no safety label (read-only or dangerous): a2a_send, access_crawl, access_crawl_preflight, access_scan, access_scan_preflight, address_bundle, address_leg_nl, address_leg_us, address_verify, anomaly_batch, anomaly_detec
note
!
Follows MCP best practices (not scored yet)
3 tips (not scored)
- !184 tools not labeled read-only don't say whether running them twice is safe (idempotentHint): a2a_send, access_crawl, access_crawl_preflight, access_scan, access_scan_preflight, address_bundle and 178 more
- !184 tools don't say whether they reach outside services like the web (openWorldHint): a2a_send, access_crawl, access_crawl_preflight, access_scan, access_scan_preflight, address_bundle and 178 more
- !The tool list is about 128 KB (roughly 32k tokens). AI apps send it with every message, so it takes that much of the AI's memory before any work starts.
note
✓
ConnectsConnected in 1.0 s
pass
✓
Lists its toolsFound 184 tools
pass
✓
No hidden instructionsNo hidden instructions found in tool descriptions
pass
✓
Fast enough
All good
- ✓Connecting took 1.0 s
- ✓Listing tools took 409 ms
pass
–
Tools work with good inputs
Not tested
- –a2a_send: Not run: no safety label (if you own this server, test again in owner mode)
- –access_crawl: Not run: no safety label (if you own this server, test again in owner mode)
- –access_crawl_preflight: Not run: no safety label (if you own this server, test again in owner mode)
- –access_scan: Not run: no safety label (if you own this server, test again in owner mode)
- –access_scan_preflight: Not run: no safety label (if you own this server, test again in owner mode)
- –address_bundle: Not run: no safety label (if you own this server, test again in owner mode)
- –address_leg_nl: Not run: no safety label (if you own this server, test again in owner mode)
- –address_leg_us: Not run: no safety label (if you own this server, test again in owner mode)
- and 32 more
not tested
–
Bad inputs give a clean errorNot tested
not tested
–
Tools work togetherNo safe tool returned data to start a chain from, so chains were not tested (not counted either way)
not tested
–
No secrets leakedNo error messages to check
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://exchangerebel.com/mcp

Show this score on GitHub

Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.

[![QAmcp score](https://qamcp.dev/s/com-exchangerebel-exchangerebel.svg)](https://qamcp.dev/s/com-exchangerebel-exchangerebel.html)

Score over time

29 Oct 202677

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use ExchangeRebel — pay-per-call APIs for AI agents (x402 on Solana), signed in with GitHub, one per person. Reviews never change the score.

Is this your server? Get an alert the moment it breaks.

QAmcp Monitor (coming soon) tests it every hour and emails you when it goes down, the score drops, a tool changes or a secret leaks. You'll also be able to claim this page and get a verified owner mark. Founding price: $19/month for life for the first 50 teams.

Have a concern, or want it removed? Ask us and we'll take it off the list. How the directory works