21.cash - Payment Links

https://21.cash/api/links/0x8c913b70Db8FAcDAdc37BC2530559DBE879b95b5

● healthy crypto

Create and share payment links with automatic revenue splitting on Base

Paid verification

No sponsored paid call yet.

Pay this endpoint once from your own wallet (Base USDC, up to $1.00) and we call it and record what came back. Your wallet pays the listed recipient directly; Agent Tools never holds funds. Sponsored checks prove delivery; they do not count as demand.

Quality grade

How grading works

B+ 67.6 / 100

Availability 20.0 / 20

Endpoint responded (HTTP 402)

Payability 15.0 / 15

✓ Answers a real HTTP 402 challenge
✓ Publishes a /.well-known/x402 descriptor
✓ Payment address on record
✓ Settlement network declared
✓ Price declared

Demand 10.1 / 35

5 distinct payers, 23 USDC transfers in the last 30 days

Performance 8.5 / 10

Last probe answered in 468 ms (full marks at 200 ms or less)

Readiness 14.0 / 15

Agent readiness 93/100

Owner verified 0.0 / 5

Nobody has claimed this listing yet

Endpoint last checked 18 h ago. On-chain activity last read 3 d ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass. This grade sets search order and leaderboards; the readiness score below is shown for reference only.

x402 readiness

A · 93/100

Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here B+, 67.6/100), which weighs availability, payability and on-chain demand. How the two differ

Valid payment requirements	10/10	Payment requirements carry a payee, a mainnet network and a price.
Live 402 challenge	25/25	Paid endpoint answers with an HTTP 402 challenge (468 ms).
x402 version	n/a	x402 version not observed yet.
Signed descriptor	n/a	No x402 standard defines a signed descriptor.
Uptime (30 days)	15/15	32/32 probes succeeded over 30 days (100%).
Resource declaration	10/10	Declares 24 paid resource(s).
Verified identity	5/10	Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
Freshness + modern flags	5/5	seen in a source within 7 days; declares x402.
Security declaration	n/a	Payment is the access control for an x402 resource.

Applicable criteria total 75 points, scaled to 100.

Responsiveness: Responsive (468 ms; bands ≤2.5 s, ≤5 s, ≤8 s, slower; penalty only).

Payment evidence: x402_challenge — We sent a request and got a live HTTP 402 challenge. Also: x402_manifest, catalog_listing. Qualifies the payment claim; adds no points.

Measured 2026-11-11.

Nine criteria, the same as the A2A readiness score, read from our daily probe of the paid endpoint, its payment requirements and 30-day probe history. Signed descriptor and security declaration are n/a for x402 (payment is the access control), as is an x402 version we have not observed; the remaining points are scaled to 100. Grades: A>=90, B>=75, C>=60, D>=40, F<40. It also feeds 15 points of the x402 quality grade.

Compared with peers

Against 10,082 reachable x402 APIs in our daily snapshot (2026-11-12 06:46 UTC). Display only; it does not change search order.

Readiness: Higher than 94% of peers; This listing 93 · peer median 78
Latency: Faster than 21% of peers; This listing 468 ms · peer median 205 ms

Where it loses the most points, and how to win them back

Verified identity −5 — Claim the listing and prove control of its domain.
Now: Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.

How many agent tools actually work · All statistics

Paid endpoints

24 resource(s) advertised by this origin. Each price below is that resource's own x402 price; the headline price is the range across them.

https://21.cash/api/links/0xf5527A3ADfdb0AB9BaE5F0d36712B6C11e10Fcc7

testing x402 payments on arc

https://21.cash/api/links/0x7C9846130239A4dc7D92F3Da3A7Dc843928190d1 $0.0100 / call

meme tip

https://21.cash/api/links/0xA98e70D1f15C9775Dd028e8674263E298060D0d7 $0.0100 / call

tester link

https://21.cash/api/links/0xAFd48162f6fE6157C78cA2FF40a2CaD7B6c9cD90 $200.0000 / call

eaaevaev

https://21.cash/api/links/0x2d0e8557Bd066A76125Ac506Af4b8eF6D520bD0e $0.0100 / call

test

https://21.cash/api/links/0xF8AF5F93973594f022f1c53E3E30748A6D09BE00 $0.0100 / call

tester

https://21.cash/api/links/0x436C3cb304A5f49D33CC5AAE01F954e3763ff8FD $50.0000 / call

payment for the week

https://21.cash/api/links/0x16059d59721BC995a7554871f78c1E1431Aad6cd $0.0100 / call

tester link

https://21.cash/api/links/0xe94E0a06C798DE7f774871898DeEEE3BCACC6Bd7 $0.0100 / call

tester

https://21.cash/api/links/0xdE24153D658adEC82aa17213464AcFEEA09cC77a $0.0100 / call

testing our privy integration

https://21.cash/api/links/0x68143cc44d379ba704241b77f63939c68b19d6f8 $0.0100 / call

meetup alpha

https://21.cash/api/links/0x62CfA56527DEaD855858871656355E1C3aaF4e9A $0.0200 / call

OpenBroker Alpha

https://21.cash/api/links/0xd293De5fB37AB5964FBa6A7A029C97043A226932 $0.0100 / call

cli-pay-link

https://21.cash/api/links/0x414c6B1DE037a9383fC29D9A93a392608874F1ea $0.0100 / call

agentic-link

https://21.cash/api/links/0x656a931fD24A7a20fe843c3f4f249f0E0E9479aA $0.0100 / call

cli-link

https://21.cash/api/links/0x1E98dbEc25F2ee20b4DF741b6c54eA9ab359555c $0.0100 / call

Clawdbot slack skill.md

https://21.cash/api/links/0x5759344057C4DE4AC9dbf32B7DD659E88A747f2b $0.0100 / call

tester-text

https://21.cash/api/links/0xe32A4190f002aD4e5dD0642dD06a563D7DE4A08B $0.0100 / call

tester no gate

https://21.cash/api/links/0x8ec8C31Ab95CDcCD19b73D5FD4DFe0Ac436f4B42 $0.0100 / call

x402 payment links > creator coins

https://21.cash/api/links/0xa8Bf14d280715203dBA385573f86a88f3c130BaA $0.0100 / call

testing gated links with 21.cash

https://21.cash/api/links/0x630344D0A40A1DBA3fE8F27764EA62D453330429 $0.0100 / call

tester

https://21.cash/api/links/0x0514A2ccd5b5a476D50AdF78B624A73D3119af1F $0.0100 / call

tester

https://21.cash/api/links/0x8c913b70Db8FAcDAdc37BC2530559DBE879b95b5 $0.1000 / call

test payment link that sends 50% to aura rewards multisig

https://21.cash/api/links/0x7784486915fE4679d285cf253e08313532dDC0B0 $0.0100 / call

lil payment to test 21.cash

How to call

cURL · x402-fetch / x402-axios will auto-handle 402

curl -sS -i -X GET https://21.cash/api/links/0x8c913b70Db8FAcDAdc37BC2530559DBE879b95b5  # expect HTTP 402 Payment Required (about $0.01/call)

/.well-known/x402.json

https://21.cash/.well-known/x402

Listed in

Directories this entry was found in.

x402scan since 2026-05-22