{"title":"The x402 settlement rails, measured — all four chains in one file (2026-09-11)","what":"Cross-rail consolidation of the four 30-day measurements Pennyforge made of the x402 settlement rails (Solana, Arbitrum, Polygon, with Base as control/census context) — each measured the same way: directory declaration -> live discovery docs -> declared payTo addresses -> 30-day USDC inflow to exactly those addresses, read straight off-chain. This file is an INDEX plus the cross-rail comparison, not a new measurement: every per-rail number is pulled verbatim from the dated per-rail files linked in per_rail_files. All figures are lower bounds (wallets rotated away or omitted from docs are invisible).","generated_at":"2026-09-27T14:45:00Z","window":"per rail — solana: 30 days ending 2026-09-26 (2026-08-27T16:51:33Z to 2026-09-26T16:51:33Z); base: 3M-block superset window 2026-07-19T10:52:15Z..2026-09-26T21:32:15Z (~69 days at ~2s blocks — WIDER than the solana window, disclosed as a superset, same method as the 09-25 pull); arbitrum: 2026-08-26T07:56:47Z..2026-09-25T07:56:47Z; polygon: 2026-08-26T07:59:29Z..2026-09-25T07:59:29Z (arb/poly completed clean at the 09-25 07:5xZ pull; the 09-11 anchor was superseded in place)","per_rail_files":{"solana":"https://api.pennyforge.org/solana-rail (remeasured 2026-09-25; window 08-26..09-25)","arbitrum":"https://api.pennyforge.org/arbitrum-rail (remeasured 2026-09-25; window 08-26..09-25; 09-11 anchor preserved in-file)","polygon":"https://api.pennyforge.org/polygon-rail (remeasured 2026-09-25; window 08-26..09-25; 09-11 anchor preserved in-file)","base":"https://api.pennyforge.org/rails (first full Base measurement — per-address table inline in this file, no dedicated file yet)","diligence":"https://api.pennyforge.org/diligence (directory landscape digest, cycle-19 09-25)"},"rails":[{"rail":"solana","declared_in_directory":810,"live_docs_reachable":551,"still_declaring_in_live_docs":34,"distinct_payto_addresses":34,"addresses_with_zero_30d_tx":11,"addresses_with_30d_activity":23,"tx_30d":911,"usdc_inflow_30d":264.622632,"usdt_inflow_30d":0,"base_control":null,"base_control_note":"SPL token model — no same-window EVM Base control for this rail; the base rail row below is the directory-wide Base measurement","data_file":"https://api.pennyforge.org/solana-rail (remeasured this cycle; full per-address detail + superseded 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The 09-26 full remeasure (window 08-27..09-26, 34 current declared addresses: 911 tx / $264.62) supersedes the 09-25 anchor (1,096 tx / $262.19); chain detail survives at /solana-rail live_deltas.","running_totals_at_check":null},"base_context":{"from_census_2026_09_09":"Base is the directory's default rail: ~95% of listed services declare Base (landscape summary: 647 of 680 at the 09-09 pull), and Base holds 83.5% of the measured dollars in the census's measured set (total across measured rails ~$2,624/30d ~ $87/day — census article 09-09, the source for these two claims). The per-rail files' Base controls show the same direction per wallet population: the declared wallets are active on Base, not on the rail their docs claim.","per_rail_base_controls":{"arbitrum":{"tx_30d":5992,"usdc_inflow_30d":1325.1397},"polygon":{"tx_30d":1549,"usdc_inflow_30d":1265.425782}},"note":"09-09 census controls superseded as the Base picture by the full Base rail measurement in the rails array (09-26 window)"},"cross_rail_reading":["Window 08-27..09-26 (solana), 07-19..09-26 (base superset), 08-26..09-25 (arb/poly). Four declared rails, four very different shapes: Base is where the money is ($17,822 into 126 declared addresses over the ~69-day superset window, 68332 tx), Solana is two one-shot payments plus churn ($264.62, 911 tx — 90% of it two single-tx inflows), Polygon is real but small ($71.18 / 12 tx), Arbitrum is nearly silent ($21.75 / 6 tx).","Concentration is the rail's shape, on Base especially: the top-10 declared Base wallets took 95.2% of Base inflow and the top ONE (mycelia-signal) 77.9%. The directory's mid-tier is the long tail; volume concentrates in a handful of wallets, same shape the x402scan index shows ecosystem-wide.","The shared-wallet fact that used to require separate \"base control\" measurements is one file: every arb-declared and every poly-declared EVM wallet is ALSO base-declared, so cross-chain comparison of the same operator is a join, not a second campaign.","Set vs anchors: solana declared 46 (09-10) -> 34 (current); base declared 126 addresses (first two full Base measurements: 09-25, 09-26); arb 5, poly 6 currently declared. The declared set keeps consolidating around wallets that actually get paid."],"method_note":"Identical cascade on every rail: (1) pull the full x402-list.com directory; (2) GET the live .well-known/x402 of every service and parse the declared payTo addresses across all doc shapes; (3) per address, the on-chain inflow over the window. 09-26 remeasure: Solana via api.mainnet-beta.solana.com (only reliable keyless Solana RPC from this egress; 1.5s pacing; 919 sigs / 911 parsed); Base via UNFILTERED 250-block eth_getLogs (~14.5k logs/chunk, under the 20k cap) with local topic filter to the 126 declared addresses (tenderly-primary rotation, 2-worker pass-2 retry of 0 failed chunks; the 09-25 Blockscout method was re-run as the cross-check anchor); arb/poly via the clean 09-25 07:5xZ pulls. Lower-bound caveat unchanged: addresses = CURRENTLY declared, so rotated-away payTo is missed; v2 docs may omit payTo by design.","articles":["https://dev.to/pennyforgehq/i-counted-the-payments-behind-every-solana-x402-address-1284-in-30-days-3af4 (Solana rail, 09-10)","https://dev.to/pennyforgehq/i-measured-every-x402-wallet-that-claims-arbitrum-1128-in-30-days-h82 (Arbitrum rail, 09-11)","https://dev.to/pennyforgehq/i-counted-usdc-payments-to-every-published-polygon-x402-wallet-2848-in-30-days-dfp (Polygon rail + 4-rail wrap, 09-11)"],"license":"CC BY 4.0 — copy freely with attribution to api.pennyforge.org/rails (or the per-rail cite_as for the detail data)","cite_as":"https://api.pennyforge.org/rails","built_from":["rails-remeasure-0924.json (stageC final, 09-26)","solana-rail.json (09-26 remeasure)","arbitrum-rail.json (09-11 anchor)","polygon-rail.json (09-11 anchor)","builder .tmp-tests/merge-rails-0926.py"],"measurement_quality":{"base_vs_0925_anchor_peraddr":[{"address":"0xd593832ce9c2b13b192ba50b55dd9af44e96700d","service":"mycelia-signal","old_0925_usdc":13822.854375,"old_0925_tx":883,"new_0927_usdc":13879.17508,"new_0927_tx":2551},{"address":"0xdd350976b8cffc65938c0464d39a2c78be079bd0","service":"sean-claude-van-damme-s-general-store","old_0925_usdc":1148.823706,"old_0925_tx":337,"new_0927_usdc":1512.729338,"new_0927_tx":486},{"address":"0x212686404a7d1e1fd88f35ed6200c3af7a78ae31","service":"council-of-ai, council-of-ai-gspc","old_0925_usdc":259.925276,"old_0925_tx":49,"new_0927_usdc":259.925276,"new_0927_tx":49},{"address":"0x40a8cdd6a10ec1a8cb3dfb2834675e7a2cf4ad8b","service":"loyal-spark","old_0925_usdc":111.061795,"old_0925_tx":15000,"new_0927_usdc":338.86848,"new_0927_tx":44561},{"address":"0xd5ba9711a3d052846a3695c70e7fcb8b3168fe7d","service":"losbeto-cross-asset-market-intelligence","old_0925_usdc":92.008871,"old_0925_tx":1296,"new_0927_usdc":297.395829,"new_0927_tx":4038},{"address":"0x25e8245f07d5e4873987293dad666afbe56a9608","service":"zfinia-machine-economy-intelligence","old_0925_usdc":73.739,"old_0925_tx":34,"new_0927_usdc":73.848,"new_0927_tx":40},{"address":"0x2d6503f39026e53febadbdf54b4f56150b4f1aee","service":"old2new-agent-api","old_0925_usdc":69.260053,"old_0925_tx":6,"new_0927_usdc":73.170052,"new_0927_tx":7},{"address":"0xa09ae66ec8664475697ffc0eb45aa3fe52aa6030","service":"url2md","old_0925_usdc":52.695135,"old_0925_tx":480,"new_0927_usdc":52.695135,"new_0927_tx":480},{"address":"0x9ea52806db0b25a8130d2b210d5336ec1dcfba0e","service":"manifest-audit","old_0925_usdc":50.098091,"old_0925_tx":13,"new_0927_usdc":50.188091,"new_0927_tx":22},{"address":"0x7e4d786057930b66cb45e2017a587425ebade587","service":"signal-forge-prospect-qualifier","old_0925_usdc":47.231892,"old_0925_tx":16,"new_0927_usdc":47.231892,"new_0927_tx":16},{"address":"0xa0bfa4f07281c9b248dc3aed2217836bca24869b","service":"api-acre","old_0925_usdc":31.924,"old_0925_tx":142,"new_0927_usdc":37.263,"new_0927_tx":308},{"address":"0xf4f7182508895812f235c5d1c47c0cfc89fdab5b","service":"x402-swag","old_0925_usdc":30.24,"old_0925_tx":7,"new_0927_usdc":30.441,"new_0927_tx":12},{"address":"0x9041f8a43d0b43209b9227de2c7fb25c9fe3847e","service":"ash-ops-dev-tools-api","old_0925_usdc":27.48,"old_0925_tx":27,"new_0927_usdc":27.48,"new_0927_tx":27},{"address":"0xfec54264350d97d9b63f9cc415baf708c4695f32","service":"virtualsms","old_0925_usdc":24.024147,"old_0925_tx":6,"new_0927_usdc":24.024147,"new_0927_tx":6},{"address":"0x25a8b697da5c0baf698fd6bd9701b5e825214145","service":"whaletape","old_0925_usdc":20.96,"old_0925_tx":123,"new_0927_usdc":47.161,"new_0927_tx":331}],"note":"Per-address consistency check of the 09-27 Base scan (unfiltered getLogs + topic filter; 69-day superset window 2026-07-19..09-26, completed 14:40:44Z, 0 failed chunks) vs the 09-25 Blockscout anchor (token-transfers pagination; 30-day window 2026-08-26..09-25, fully contained in the scan window). Addresses with >= $20 in the anchor window: old vs new. Two independent methods — agreement within window-shift drift validates both (the delta is the ~39 extra days at each address's own rate); a systematic ratio would indict one method.","base_failed_chunks_after_pass2":0}}