Underscoredone alternatives

15 x402 commerce APIs compared with Underscoredone: the price per call read from each 402, x402 grade, uptime and median response time from our own daily unpaid checks.

Underscoredone for reference

Pay-per-use tools agents can call without an account, such as ASN/IP lookups, BIMI and CORS checks.

Up · x402 grade A (95/100) · 100% up (14/14 checks) · $0.01 per call in its 402 · 331 ms median

Underscoredone review · Is Underscoredone down?

Top ranked

ASIN402

Grade A (100/100), up

Lowest price per call in its 402

AgentMail

$0, below Underscoredone's $0.01

Fastest median response

ASIN402

151 ms (Underscoredone: 331 ms)

15 Underscoredone alternatives compared

Ranked by x402 grade, then uptime from our daily checks, then x402 score and response time. Price is shown but never used for ranking; “lower” or “higher” compares with Underscoredone’s $0.01 per call. Paid placement never changes the order.

#	Listing and why pick it	Status	x402 grade	Uptime (checks so far)	Price in 402	Response (median)
1	ASIN402 status Lower price per call ($0.005 vs $0.01); higher x402 score (100 vs 95) Amazon product data for agents across 11 marketplaces: price and sales history, offers, search, best…	Up	A (100/100)	100% (14/14)	$0.005 (lower)	151 ms
2	OneShot status Lower price per call ($0.002 vs $0.01); higher x402 score (100 vs 95) Agent service that takes a goal and a budget and works through it over time using its own set of tools.	Up	A (100/100)	100% (14/14)	$0.002 (lower)	298 ms
3	Telnyx status Lower price per call ($0.002 vs $0.01); faster median response (212 ms vs 331 ms) Telecom carrier offering voice, messaging and AI infrastructure for real-time agents on its own network.	Up	A (95/100)	100% (14/14)	$0.002 (lower)	212 ms
4	StableTickets status Grade A, 100% up so far, $0.01 per call; no measured edge over Underscoredone Pay-per-request access to Ticketmaster's Discovery API for events, venues and attractions.	Up	A (95/100)	100% (14/14)	$0.01	357 ms
5	StableTravel status Grade A, 100% up so far, $0.02 per call; no measured edge over Underscoredone Pay-per-request travel data for agents: flights, award seats, hotels, activities and transfers.	Up	A (90/100)	100% (14/14)	$0.02 (higher)	318 ms
6	OnlyBots status Lower price per call ($0.002 vs $0.01) Small catalog of agent APIs (reader, search, PDF reading) paid per call in USDC over x402.	Up	B (85/100)	100% (14/14)	$0.002 (lower)	336 ms
7	x402-signature-service Grade D, 100% up so far, $0.50 per call; no measured edge over Underscoredone E-signatures for AI agents: send one PDF to one email recipient for a simple electronic signature, track its…	Up	D (60/100)	100% (14/14)	$0.50 (higher)	294 ms
8	AgentMail status Lower price per call ($0 vs $0.01); also pays on Polygon and Avalanche Email inbox API for AI agents: create inboxes, then send, receive and search messages over REST. An x402…	Up	F (5/100)	100% (14/14)	$0 (lower)	413 ms
9	LeftClaw Services status Grade A, 100% up so far, $1.00 per call; no measured edge over Underscoredone Hire an AI Ethereum builder for consulting, builds and audits, paid in CLAWD or USDC on Base.	Up	A (95/100)	100% (14/14)	$1.00 (higher)	517 ms
10	Affiliate.com status Grade A, 100% up so far, $0.02 per call; no measured edge over Underscoredone Structured, real-time product data for publishers, networks and brands, for AI and traditional shopping.	Up	A (95/100)	100% (14/14)	$0.02 (higher)	898 ms
11	Agentic Reservations status Grade A, 100% up so far, $0.01 per call; no measured edge over Underscoredone API that lets AI agents search and book Resy restaurant reservations, paid per booking in USDC.	Up	A (90/100)	100% (14/14)	$0.01	410 ms
12	JapanAgent Bridge Lower price per call ($0.002 vs $0.01) Japan API for agents that checks Japanese identifiers, searches local-government grants and runs research in…	Up	B (85/100)	100% (14/14)	$0.002 (lower)	552 ms
13	Palmyr status Lower price per call ($0.001 vs $0.01) Phone numbers, email, compute and domains for AI agents, paid in USDC over x402.	Up	B (80/100)	100% (14/14)	$0.001 (lower)	510 ms
14	SingIt Lower price per call ($0.0015 vs $0.01) Spending wallet for AI agents: set a daily and a per-purchase limit once, and the agent buys gift cards,…	Up	D (60/100)	100% (14/14)	$0.0015 (lower)	683 ms
15	Card Hedge API status Higher x402 score (100 vs 95) Sports and trading card data API: graded-card prices, comps, price history, cert lookups and image-based…	Up	A (100/100)	100% (7/7)	$0.01	1109 ms

1. ASIN402Up
Lower price per call ($0.005 vs $0.01); higher x402 score (100 vs 95)
x402 grade
A (100/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.005 (lower)
Response
151 ms
ASIN402 status
2. OneShotUp
Lower price per call ($0.002 vs $0.01); higher x402 score (100 vs 95)
x402 grade
A (100/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.002 (lower)
Response
298 ms
OneShot status
3. TelnyxUp
Lower price per call ($0.002 vs $0.01); faster median response (212 ms vs 331 ms)
x402 grade
A (95/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.002 (lower)
Response
212 ms
Telnyx status
4. StableTicketsUp
Grade A, 100% up so far, $0.01 per call; no measured edge over Underscoredone
x402 grade
A (95/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.01
Response
357 ms
StableTickets status
5. StableTravelUp
Grade A, 100% up so far, $0.02 per call; no measured edge over Underscoredone
x402 grade
A (90/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.02 (higher)
Response
318 ms
StableTravel status
6. OnlyBotsUp
Lower price per call ($0.002 vs $0.01)
x402 grade
B (85/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.002 (lower)
Response
336 ms
OnlyBots status
7. x402-signature-serviceUp
Grade D, 100% up so far, $0.50 per call; no measured edge over Underscoredone
x402 grade
D (60/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.50 (higher)
Response
294 ms
8. AgentMailUp
Lower price per call ($0 vs $0.01); also pays on Polygon and Avalanche
x402 grade
F (5/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0 (lower)
Response
413 ms
AgentMail status
9. LeftClaw ServicesUp
Grade A, 100% up so far, $1.00 per call; no measured edge over Underscoredone
x402 grade
A (95/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$1.00 (higher)
Response
517 ms
LeftClaw Services status
10. Affiliate.comUp
Grade A, 100% up so far, $0.02 per call; no measured edge over Underscoredone
x402 grade
A (95/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.02 (higher)
Response
898 ms
Affiliate.com status
11. Agentic ReservationsUp
Grade A, 100% up so far, $0.01 per call; no measured edge over Underscoredone
x402 grade
A (90/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.01
Response
410 ms
Agentic Reservations status
12. JapanAgent BridgeUp
Lower price per call ($0.002 vs $0.01)
x402 grade
B (85/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.002 (lower)
Response
552 ms
13. PalmyrUp
Lower price per call ($0.001 vs $0.01)
x402 grade
B (80/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.001 (lower)
Response
510 ms
Palmyr status
14. SingItUp
Lower price per call ($0.0015 vs $0.01)
x402 grade
D (60/100)
Uptime (checks so far)
100% (14/14)
Price in 402
$0.0015 (lower)
Response
683 ms
15. Card Hedge APIUp
Higher x402 score (100 vs 95)
x402 grade
A (100/100)
Uptime (checks so far)
100% (7/7)
Price in 402
$0.01
Response
1109 ms
Card Hedge API status

Prices are what each endpoint’s 402 asked for at our last check, for the one endpoint we check. Each API does its own job and other routes may be priced differently, so a lower price is not like-for-like. Check the provider before paying.

Underscoredone alternatives FAQ

What are the best alternatives to Underscoredone?

By our ranking (x402 grade, then uptime from our daily checks, then x402 score and response time): ASIN402, OneShot, Telnyx. Each does its own job, so check that its endpoints cover what you use Underscoredone for.

Is there a cheaper alternative to Underscoredone?

8 of the 15 alternatives asked for less per call than Underscoredone's $0.01 in their 402 at our last check: ASIN402 ($0.005), OneShot ($0.002), Telnyx ($0.002), OnlyBots ($0.002), AgentMail ($0) and others. Prices are for the endpoint we check; other routes and what you get per call differ, so check the provider before paying.

How are these alternatives ranked?

Same category, ranked by x402 grade, then uptime from our own daily unpaid checks, then x402 score, valid x402 share and median response time. Price is shown but never used for ranking, and paid placement never changes the order.

Underscoredone review·Underscoredone status·commerce APIs status·Best commerce APIs·Uptime leaderboard

Data as of Nov 10, 2026, 7:20 AM ET. One unpaid request per listing per day to its example endpoint; up means any answer below HTTP 500 except 404/410 within 8 seconds. The x402 grade comes from x402fix, our free unpaid check of each 402 payment request; it rates the payment request, not uptime, and is not an endorsement. Listings with no check yet, no price read from a 402, or a check we are fixing are left out.

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