protocol stringclasses 5
values | metric stringlengths 12 38 | value stringlengths 1 51 ⌀ | unit stringclasses 9
values | measured_at stringdate 2026-10-08 00:00:00 2026-10-08 00:00:00 | source_url stringlengths 24 119 ⌀ | method stringlengths 23 350 | notes stringlengths 18 481 ⌀ |
|---|---|---|---|---|---|---|---|
x402 | canonical_repo | x402-foundation/x402 | repo | 2026-10-08 | https://github.com/x402-foundation/x402 | Manually verified: GitHub org search for x402-related repos (query below), picked the repo with highest stars and an org name matching the foundation that maintains the spec | Originated at Coinbase (2025); spec and trademark now stewarded by the x402 Foundation. Repo description: a payments protocol for the internet built around the HTTP 402 status code. |
x402 | github_stars | 6689 | count | 2026-10-08 | https://api.github.com/repos/x402-foundation/x402 | GET /repos/x402-foundation/x402 (Authorization: token $GITHUB_TOKEN), .stargazers_count | null |
x402 | github_forks | 2146 | count | 2026-10-08 | https://api.github.com/repos/x402-foundation/x402 | GET /repos/x402-foundation/x402 .forks_count | null |
x402 | github_open_issues_and_prs | 683 | count | 2026-10-08 | https://api.github.com/repos/x402-foundation/x402 | GET /repos/x402-foundation/x402 .open_issues_count | GitHub's open_issues_count field includes open PRs, not issues only. |
x402 | github_closed_issues | 469 | count | 2026-10-08 | https://api.github.com/search/issues?q=repo:x402-foundation/x402+type:issue+state:closed | GET /search/issues?q=repo:x402-foundation/x402+type:issue+state:closed .total_count | Issues only (PRs excluded via type:issue). |
x402 | github_contributors | 333 | count | 2026-10-08 | https://api.github.com/repos/x402-foundation/x402/contributors | GET /repos/x402-foundation/x402/contributors?per_page=100, paginated, counted items across all pages | Counts registered GitHub accounts only (anon=0, default). |
x402 | github_commits_last_90d | 281 | count | 2026-10-08 | https://api.github.com/repos/x402-foundation/x402/commits | GET /repos/x402-foundation/x402/commits?since=2026-07-10T...Z&per_page=100, paginated, counted items | since = measured_at minus 90 days, computed at run time. |
x402 | github_latest_tag_by_list_order | v1 | tag | 2026-10-08 | https://api.github.com/repos/x402-foundation/x402/tags | GET /repos/x402-foundation/x402/tags?per_page=5, took items[0].name | CAVEAT: the /tags endpoint is not sorted by date. The chronologically most recent tag is pypi-x402@v2.25.0, committed 2026-09-29T19:01:32Z (checked via /repos/.../commits/<sha>). v1 itself was committed 2025-12-10. |
x402 | github_latest_release | not_found | release | 2026-10-08 | https://api.github.com/repos/x402-foundation/x402/releases/latest | GET /repos/x402-foundation/x402/releases/latest | Returns 404 'Not Found' - the repo does not use GitHub Releases; it tags per-package version bumps instead (see pypi-x402@v2.25.0 above). |
x402 | github_repo_search_count | 28297 | count (approximate) | 2026-10-08 | https://api.github.com/search/repositories?q=x402+in:name,description,readme | GET /search/repositories?q=x402 in:name,description,readme .total_count | GitHub documents repository search counts as approximate for large result sets. "x402" is a specific enough token that false positives should be rare. |
x402 | npm_weekly_downloads:x402 | 458455 | downloads/week | 2026-10-08 | https://api.npmjs.org/downloads/point/last-week/x402 | GET api.npmjs.org/downloads/point/last-week/x402, week 2026-10-01 to 2026-10-07 | Official core TS/JS SDK package maintained in typescript/packages/x402 of the spec repo. |
x402 | npm_weekly_downloads:x402-fetch | 13516 | downloads/week | 2026-10-08 | https://api.npmjs.org/downloads/point/last-week/x402-fetch | GET api.npmjs.org/downloads/point/last-week/x402-fetch | Official fetch-wrapper client package maintained in the same monorepo. |
x402 | npm_weekly_downloads:x402-axios | 1642 | downloads/week | 2026-10-08 | https://api.npmjs.org/downloads/point/last-week/x402-axios | GET api.npmjs.org/downloads/point/last-week/x402-axios | Official axios-interceptor client package, same monorepo. |
x402 | npm_weekly_downloads:x402-express | 9929 | downloads/week | 2026-10-08 | https://api.npmjs.org/downloads/point/last-week/x402-express | GET api.npmjs.org/downloads/point/last-week/x402-express | Official Express middleware package, same monorepo. |
x402 | npm_weekly_downloads:x402-next | 1540 | downloads/week | 2026-10-08 | https://api.npmjs.org/downloads/point/last-week/x402-next | GET api.npmjs.org/downloads/point/last-week/x402-next | Official Next.js middleware package, same monorepo. |
x402 | pypi_monthly_downloads:x402 | 204765 | downloads/month | 2026-10-08 | https://pypistats.org/api/packages/x402/recent | GET pypistats.org/api/packages/x402/recent .data.last_month | Official Python SDK, maintained in python/x402 of the spec repo (pyproject.toml name = "x402"). |
x402 | mcp_registry_distinct_servers | 214 | count | 2026-10-08 | https://registry.modelcontextprotocol.io/v0/servers?search=x402&limit=100 | GET registry.modelcontextprotocol.io/v0/servers?search=x402&limit=100, paginated via metadata.nextCursor (7 pages, 657 raw rows), deduped by server.name | Spot-checked 10 random entries; all genuinely describe x402-based pay-per-call MCP tools or facilitators. |
x402 | ecosystem_facilitators_listed | 15 | count | 2026-10-08 | https://docs.x402.org/dev-tools/facilitators | Fetched https://docs.x402.org/dev-tools/facilitators.md (Mintlify's plain-markdown mirror of the rendered docs page) and counted rows in the 'Which option should I use' facilitators table by hand. | Page states it is "not an exhaustive catalog" of selected production facilitators; it is the closest thing x402 has to an official ecosystem/partners page. |
x402 | spec_version | 2 | version | 2026-10-08 | https://github.com/x402-foundation/x402/blob/main/specs/x402-specification-v2.md | Fetched specs/x402-specification-v2.md, read 'Protocol Version: 2' from the header. | v1 spec also still present in the repo (specs/x402-specification-v1.md); v2 is current. |
x402 | spec_last_changed | 2026-08-31 | date | 2026-10-08 | https://api.github.com/repos/x402-foundation/x402/commits?path=specs/x402-specification-v2.md | GET /repos/x402-foundation/x402/commits?path=specs/x402-specification-v2.md&per_page=1, took items[0].commit.committer.date | null |
AP2 | canonical_repo | google-agentic-commerce/AP2 | repo | 2026-10-08 | https://github.com/google-agentic-commerce/AP2 | Manually verified via GET /orgs/google-agentic-commerce/repos - AP2 is the highest-starred repo in Google's own agentic-commerce org. | Full name: Agent Payments Protocol. Maintained by Google under the google-agentic-commerce GitHub org (not under google/ or googleapis/). |
AP2 | github_stars | 3211 | count | 2026-10-08 | https://api.github.com/repos/google-agentic-commerce/AP2 | GET /repos/google-agentic-commerce/AP2 .stargazers_count | null |
AP2 | github_forks | 509 | count | 2026-10-08 | https://api.github.com/repos/google-agentic-commerce/AP2 | GET /repos/google-agentic-commerce/AP2 .forks_count | null |
AP2 | github_open_issues_and_prs | 173 | count | 2026-10-08 | https://api.github.com/repos/google-agentic-commerce/AP2 | GET /repos/google-agentic-commerce/AP2 .open_issues_count | Includes open PRs. |
AP2 | github_closed_issues | 13 | count | 2026-10-08 | https://api.github.com/search/issues?q=repo:google-agentic-commerce/AP2+type:issue+state:closed | GET /search/issues?q=repo:google-agentic-commerce/AP2+type:issue+state:closed .total_count | null |
AP2 | github_contributors | 19 | count | 2026-10-08 | https://api.github.com/repos/google-agentic-commerce/AP2/contributors | GET /repos/google-agentic-commerce/AP2/contributors?per_page=100, paginated, counted items | null |
AP2 | github_commits_last_90d | 0 | count | 2026-10-08 | https://api.github.com/repos/google-agentic-commerce/AP2/commits | GET /repos/google-agentic-commerce/AP2/commits?since=<90d ago>&per_page=100, counted items | Repo's last push (to any branch) was 2026-06-17; no commits to default branch landed in the 90 days before measurement. |
AP2 | github_latest_release | v0.2.0 | tag | 2026-10-08 | https://api.github.com/repos/google-agentic-commerce/AP2/releases/latest | GET /repos/google-agentic-commerce/AP2/releases/latest .tag_name, .published_at | Published 2026-04-28. CHANGELOG.md confirms "Release of V2". |
AP2 | github_repo_search_count | 2587 | count (approximate) | 2026-10-08 | https://api.github.com/search/repositories?q=AP2+in:name,description,readme+agent | GET /search/repositories?q=AP2 in:name,description,readme agent .total_count | "AP2" alone is too generic (11375 raw hits, many unrelated to payments - e.g. telecom/hardware project codenames); added 'agent' as a qualifier to approximate relevant repos. Still approximate and likely includes some noise; see METHODOLOGY.md. |
AP2 | npm_weekly_downloads | not_applicable | downloads/week | 2026-10-08 | null | No search performed - no npm package name is referenced anywhere in the AP2 spec repo (no package.json published to npm; code/sdk directory is Python only). | not measurable: no official npm package exists. |
AP2 | pypi_monthly_downloads | not_measurable | downloads/month | 2026-10-08 | https://pypi.org/pypi/ap2/json | Checked https://pypi.org/pypi/ap2/json: a package named 'ap2' exists on PyPI, but its project_urls point to github.com/whillhill/ap2, an unrelated third-party repo, not google-agentic-commerce/AP2. | The spec repo's own pyproject.toml (code/pyproject.toml) sets name = "ap2" but that package has not been published to PyPI under Google's control, as far as we found. Treating this as not measurable rather than reporting the squatted package's numbers. |
AP2 | mcp_registry_distinct_servers | 3 | count | 2026-10-08 | https://registry.modelcontextprotocol.io/v0/servers?search=AP2&limit=100 | GET registry.modelcontextprotocol.io/v0/servers?search=AP2&limit=100 (1 page, 11 raw rows), deduped by server.name | All 3 distinct servers' descriptions explicitly reference Google AP2 (mandates/spend authorization); manually checked, no false positives found. |
AP2 | ecosystem_partners_listed | not_found | count | 2026-10-08 | https://ap2-protocol.org | Checked ap2-protocol.org/llms.txt (full docs index) and the rendered site; no ecosystem, partners, or implementations page exists in the docs nav. | not measurable: AP2 has no official ecosystem/partners page as of 2026-10-08. |
AP2 | spec_version | 0.2.0 | version | 2026-10-08 | https://github.com/google-agentic-commerce/AP2/blob/main/CHANGELOG.md | Fetched CHANGELOG.md; latest entry is '## 0.2.0 (2026-04-28)' labeled 'Release of V2'. | null |
AP2 | spec_last_changed | 2026-04-28 | date | 2026-10-08 | https://github.com/google-agentic-commerce/AP2/blob/main/CHANGELOG.md | Same CHANGELOG.md entry date. | This is the code package version bump date; the docs site content (ap2-protocol.org) is built from the same repo and was not checked separately for post-0.2.0 wording edits. |
ACP | canonical_repo | agentic-commerce-protocol/agentic-commerce-protocol | repo | 2026-10-08 | https://github.com/agentic-commerce-protocol/agentic-commerce-protocol | Confirmed via GET /repos/agentic-commerce-protocol/agentic-commerce-protocol: description reads 'The specification is currently maintained by OpenAI and Stripe.' | Full name: Agentic Commerce Protocol. Org created 2025-09-16; dedicated GitHub org, not under openai/ or stripe/. |
ACP | github_stars | 1568 | count | 2026-10-08 | https://api.github.com/repos/agentic-commerce-protocol/agentic-commerce-protocol | GET /repos/.../agentic-commerce-protocol .stargazers_count | null |
ACP | github_forks | 253 | count | 2026-10-08 | https://api.github.com/repos/agentic-commerce-protocol/agentic-commerce-protocol | GET /repos/.../agentic-commerce-protocol .forks_count | null |
ACP | github_open_issues_and_prs | 144 | count | 2026-10-08 | https://api.github.com/repos/agentic-commerce-protocol/agentic-commerce-protocol | GET /repos/.../agentic-commerce-protocol .open_issues_count | Includes open PRs. |
ACP | github_closed_issues | 14 | count | 2026-10-08 | https://api.github.com/search/issues?q=repo:agentic-commerce-protocol/agentic-commerce-protocol+type:issue+state:closed | GET /search/issues?q=...+type:issue+state:closed .total_count | null |
ACP | github_contributors | 26 | count | 2026-10-08 | https://api.github.com/repos/agentic-commerce-protocol/agentic-commerce-protocol/contributors | GET .../contributors?per_page=100, paginated, counted items | null |
ACP | github_commits_last_90d | 1 | count | 2026-10-08 | https://api.github.com/repos/agentic-commerce-protocol/agentic-commerce-protocol/commits | GET .../commits?since=<90d ago>&per_page=100, counted items | null |
ACP | github_latest_release | not_found | release | 2026-10-08 | https://api.github.com/repos/agentic-commerce-protocol/agentic-commerce-protocol/releases/latest | GET .../releases/latest | Returns 404; repo has no tags and no GitHub Releases. Versioning is date-stamped inside the repo instead (see spec_version row). |
ACP | github_repo_search_count | 977 | count (approximate) | 2026-10-08 | https://api.github.com/search/repositories?q=%22agentic+commerce+protocol%22+in:name,description,readme | GET /search/repositories?q="agentic commerce protocol" in:name,description,readme .total_count | Used the exact phrase in quotes rather than bare 'ACP', because 'ACP' alone is an extremely overloaded acronym (46405 raw hits for 'ACP' alone, mostly unrelated). |
ACP | npm_weekly_downloads | not_applicable | downloads/week | 2026-10-08 | null | Repo's package.json name is @agentic-commerce-protocol/specification; checked https://registry.npmjs.org/@agentic-commerce-protocol/specification -> 404. | not measurable: the official package name is not published to the npm registry (used as an internal workspace package only, as far as we found). |
ACP | pypi_monthly_downloads | not_applicable | downloads/month | 2026-10-08 | null | No PyPI package is referenced anywhere in the spec repo (it is a TypeScript/JSON-schema repo with no Python package). | not measurable: no official PyPI package exists. |
ACP | mcp_registry_distinct_servers_raw | 8 | count | 2026-10-08 | https://registry.modelcontextprotocol.io/v0/servers?search=ACP&limit=100 | GET registry.modelcontextprotocol.io/v0/servers?search=ACP&limit=100 (1 page, 15 raw rows), deduped by server.name | Raw dedupe count using the literal search term 'ACP', as specified in the task. |
ACP | mcp_registry_distinct_servers_verified | 2 | count | 2026-10-08 | https://registry.modelcontextprotocol.io/v0/servers?search=ACP&limit=100 | Manually read all 8 deduped entries' descriptions; counted only the ones that explicitly name 'Stripe ACP' or 'Agentic Commerce Protocol' checkout. | 6 of the 8 raw matches are false positives for other things abbreviated 'ACP' (an AI social network called 'acprompt', an unrelated 'Agentic Control Plane' cost/policy tool, an MCP-to-ACP coding-agent bridge unrelated to commerce, a username containing the substring 'acp', an unrelated banking-data MCP server, and the ... |
ACP | ecosystem_partners_listed | not_found | count | 2026-10-08 | https://www.agenticcommerce.dev | Checked agenticcommerce.dev/llms.txt (full docs index) and the rendered site; no ecosystem or partners listing page exists, only a link to Stripe's own ACP integration docs and a ChatGPT merchant application form. | not measurable: ACP has no official ecosystem/partners page as of 2026-10-08. |
ACP | spec_version | 2026-04-17 | version | 2026-10-08 | https://github.com/agentic-commerce-protocol/agentic-commerce-protocol/tree/main/changelog | Listed changelog/ directory; filenames are date-stamped API versions. Latest promoted version file is changelog/2026-04-17.md, whose own text reads 'API Version: 2026-04-17'. | The repo also has an unreleased/ dir with changes not yet promoted to a dated version, and package.json carries an unrelated code-package version (0.1.0) that is not the spec's API version. |
ACP | spec_last_changed | 2026-07-18 | date | 2026-10-08 | https://api.github.com/repos/agentic-commerce-protocol/agentic-commerce-protocol/commits?path=spec | GET /repos/.../commits?path=spec&per_page=1, took items[0].commit.committer.date | Most recent commit touching the spec/ directory (JSON schema / OpenAPI / OpenRPC files), which is more recent than the last dated changelog entry (2026-04-17) - i.e. there are unreleased spec edits in progress. |
L402 | canonical_repo | lightninglabs/L402 | repo | 2026-10-08 | https://github.com/lightninglabs/L402 | GitHub repo search for 'L402 in:name' surfaced two candidate specs: lightninglabs/L402 (91 stars, created 2020, by Lightning Labs who coined L402) and l402-protocol/l402 (227 stars, created 2025, independent org). Picked lightninglabs/L402 as canonical because it is the originating org's repo and was more recently push... | CAVEAT: l402-protocol/l402 has more stars and describes itself as a newer community-driven continuation ('The Missing Piece in the Internet's Payment Infrastructure'); readers should be aware L402 has two competing spec homes. We did not collect full metrics for l402-protocol/l402; see notes in FINDINGS.md. |
L402 | github_stars | 91 | count | 2026-10-08 | https://api.github.com/repos/lightninglabs/L402 | GET /repos/lightninglabs/L402 .stargazers_count | null |
L402 | github_forks | 19 | count | 2026-10-08 | https://api.github.com/repos/lightninglabs/L402 | GET /repos/lightninglabs/L402 .forks_count | null |
L402 | github_open_issues_and_prs | 11 | count | 2026-10-08 | https://api.github.com/repos/lightninglabs/L402 | GET /repos/lightninglabs/L402 .open_issues_count | Includes open PRs. |
L402 | github_closed_issues | 3 | count | 2026-10-08 | https://api.github.com/search/issues?q=repo:lightninglabs/L402+type:issue+state:closed | GET /search/issues?q=repo:lightninglabs/L402+type:issue+state:closed .total_count | null |
L402 | github_contributors | 8 | count | 2026-10-08 | https://api.github.com/repos/lightninglabs/L402/contributors | GET .../contributors?per_page=100, paginated, counted items | null |
L402 | github_commits_last_90d | 0 | count | 2026-10-08 | https://api.github.com/repos/lightninglabs/L402/commits | GET .../commits?since=<90d ago>&per_page=100, counted items | Last push to the repo was 2026-06-09, outside the 90-day window measured from 2026-10-08. |
L402 | github_latest_release | not_found | release | 2026-10-08 | https://api.github.com/repos/lightninglabs/L402/releases/latest | GET .../releases/latest | Returns 404; repo has no tags and no GitHub Releases. |
L402 | github_repo_search_count | 938 | count (approximate) | 2026-10-08 | https://api.github.com/search/repositories?q=L402+in:name,description,readme | GET /search/repositories?q=L402 in:name,description,readme .total_count | Includes repos referencing both lightninglabs/L402 and l402-protocol/l402 implementations; not separable by this query alone. |
L402 | npm_weekly_downloads | not_applicable | downloads/week | 2026-10-08 | null | Checked the repo tree: no npm package is published from lightninglabs/L402 itself. A related repo, lightninglabs/L402sdk, exists but its npm package (if any) was not located under an obvious name; not counted as 'official' with confidence. | not measurable: no clearly-official L402 SDK package identified with confidence in the time available. |
L402 | pypi_monthly_downloads | not_applicable | downloads/month | 2026-10-08 | null | No PyPI package is referenced in the lightninglabs/L402 repo (it is a spec/docs repo | implementations live in separate repos like Aperture (Go) and lsat-js (JS)).,not measurable: no official PyPI package exists for this spec repo. |
L402 | mcp_registry_distinct_servers | 5 | count | 2026-10-08 | https://registry.modelcontextprotocol.io/v0/servers?search=L402&limit=100 | GET registry.modelcontextprotocol.io/v0/servers?search=L402&limit=100 (1 page, 14 raw rows), deduped by server.name | Spot-checked all 5; all genuinely describe L402/Lightning pay-per-call MCP tools. |
L402 | ecosystem_implementations_listed | 3 | count | 2026-10-08 | https://github.com/lightninglabs/L402#implementations | Fetched README.md raw text, counted bullet points under the '## Implementations' heading by hand. | Aperture (gRPC/HTTP auth proxy), lsat-js (JS client library), boltwall (Node.js middleware). This is a short, hand-maintained list, not a submission-based ecosystem directory like x402's. |
L402 | spec_version | unversioned | version | 2026-10-08 | https://github.com/lightninglabs/L402/blob/master/protocol-specification.md | Read protocol-specification.md; no explicit version number field found in the document. | not in spec: L402's spec document does not carry an explicit version number. |
L402 | spec_last_changed | 2026-03-20 | date | 2026-10-08 | https://api.github.com/repos/lightninglabs/L402/commits?path=protocol-specification.md | GET /repos/lightninglabs/L402/commits?path=protocol-specification.md&per_page=1, took items[0].commit.committer.date | null |
excluded | Visa_Trusted_Agent_Protocol | null | null | 2026-10-08 | null | Searched GitHub for 'trusted agent protocol visa' and checked github.com/visa (16 public repos, none matching). No canonical spec repo or public spec document from Visa was found. | EXCLUDED: only third-party demo repos reference Visa TAP (e.g. thomaspurves/visa-tap-demo); Visa has not published an open spec or reference repo as of 2026-10-08. |
excluded | Mastercard_Agent_Pay | null | null | 2026-10-08 | null | Searched GitHub for 'mastercard agent pay'. No official Mastercard org repo or public spec document was found. | EXCLUDED: only third-party demo/hackathon repos reference Mastercard Agent Pay (e.g. plannerpenta-lang/mastercard-agent-chat). Mastercard has not published an open spec or reference repo as of 2026-10-08. |
Agent Payment Protocols Adoption Tracker (October 2026): x402 vs AP2 vs ACP vs L402
Disclosure: Published by PinkWallet, which builds Pink Agentic AI Payments (an agent spending-control layer). Pink is not one of the protocols measured and does not integrate with any of them today.
A monthly snapshot of public adoption signals for x402, AP2 (Agent Payments Protocol) and ACP (Agentic Commerce Protocol), plus L402 as a longer-running comparison point. Measured 2026-10-08/09.
Full report, methodology, findings, and reproduction script: https://github.com/Pink-Agentic-Payments/agent-payment-protocols-tracker
Summary
| Protocol | GitHub stars | Contributors | Commits (90d) | Official npm downloads/week [^npm] | Official PyPI downloads/month [^pypi] | MCP Registry servers [^mcp] | Facilitators/partners listed [^fac] |
|---|---|---|---|---|---|---|---|
| x402 | 6,689 | 333 | 281 | 485,082 | 204,765 | 214 | 15 |
| AP2 | 3,211 | 19 | 0 | n/a | n/a | 3 | n/a |
| ACP | 1,568 | 26 | 1 | n/a | n/a | 2 | n/a |
| L402 | 91 | 8 | 0 | n/a | n/a | 5 | 3 |
[^npm]: Sum of official npm packages. x402: x402, x402-fetch, x402-axios, x402-express, x402-next (all maintained in the x402 monorepo). AP2 and ACP have no official npm package we could confirm; L402's possible SDK package could not be identified with confidence. "n/a" means not measurable, not zero.
[^pypi]: x402's official PyPI package is x402. AP2's and ACP's spec repos reference no official PyPI package. A PyPI package named ap2 exists but belongs to an unrelated third-party repo, not Google's, and is excluded.
[^mcp]: Distinct server names in the official MCP Registry naming each protocol. ACP's figure is the manually verified count (2 of 8 raw matches; the other 6 are unrelated tools that also abbreviate to "ACP").
[^fac]: x402's figure is its official facilitators directory (docs.x402.org). L402's figure is its README's hand-maintained "Implementations" list. AP2 and ACP publish no equivalent ecosystem/partners page as of 2026-10-08.
Findings (condensed)
- x402 has by far the largest GitHub footprint: 6,689 stars / 333 contributors vs. 3,211 / 19 for AP2 and 1,568 / 26 for ACP.
- x402's spec repo is far more active: 281 commits in the last 90 days vs. 1 for ACP and 0 for AP2.
- x402 has a measured package-download footprint (458,455 npm downloads/week, 204,765 PyPI downloads/month on the official packages); AP2 and ACP have none we could confirm.
- x402 dominates the MCP ecosystem: 214 distinct registered MCP servers vs. 3 for AP2 and 2 verified for ACP.
- x402's GitHub code-footprint search also leads (28,297 repos), vs. 2,587 for AP2 and 977 for ACP (approximate GitHub search counts).
- AP2 has one versioned release (v0.2.0); ACP ships on a rolling date-stamped API version instead of releases.
- x402 is the only one of the three with a maintained facilitator directory (15 listed).
- L402 is now the smallest by every GitHub metric measured, despite being the oldest (2020).
- Visa's "Trusted Agent Protocol" and Mastercard's "Agent Pay" have no public spec repo and are excluded.
- L402 has two competing "canonical" homes on GitHub; this tracker measured only
lightninglabs/L402.
Full findings with exact source rows: see FINDINGS.md in the GitHub repo.
What none of these protocols decide
x402's own spec is explicit: "Out of Scope: This specification does not include: ... Client-side budget management" (specs/x402-specification-v2.md). AP2, ACP and L402 likewise have no standing per-agent budget, payee-rule, or human-approval primitive in their specs. See WHAT_NONE_DECIDE.md in the GitHub repo for full detail with quotes and sources.
Where Pink fits
The per-agent budget, payee-rule and human-approval layer that these specs leave out is what Pink Agentic AI Payments does for payments an agent makes through Pink's own MCP server. It does not plug into x402, AP2, ACP or L402 today. Try it in the public sandbox with test money: https://agentic-sandbox.pinkwallet.com
Files
tracker.csv: the full dataset, one row per (protocol, metric), withsource_urlandmethodcolumns for every value.
License
CC BY 4.0. Attribution: PinkWallet, Agent Payment Protocols Adoption Tracker (October 2026).
How to cite
PinkWallet (2026). Agent Payment Protocols Adoption Tracker (October 2026). Version 2026.10. CC BY 4.0. https://github.com/Pink-Agentic-Payments/agent-payment-protocols-tracker
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